Articles | Volume 18, issue 9
30 Sep 2014
Research article | 30 Sep 2014
Flow regime change in an endorheic basin in southern Ethiopia
F. F. Worku et al.
No articles found.
Abebe D. Chukalla, Marloes L. Mul, Pieter van der Zaag, Gerardo van Halsema, Evaristo Mubaya, Esperança Muchanga, Nadja den Besten, and Poolad Karimi
Hydrol. Earth Syst. Sci., 26, 2759–2778,Short summary
New techniques to monitor the performance of irrigation schemes are vital to improve land and water productivity. We developed a framework and applied the remotely sensed FAO WaPOR dataset to assess uniformity, equity, adequacy, and land and water productivity at the Xinavane sugarcane estate, segmented by three irrigation methods. The developed performance assessment framework and the Python script in Jupyter Notebooks can aid in such irrigation performance analysis in other regions.
Jonatan Godinez Madrigal, Nora Van Cauwenbergh, Jaime Hoogesteger, Pamela Claure Gutierrez, and Pieter van der Zaag
Hydrol. Earth Syst. Sci., 26, 885–902,Short summary
Urban water systems are facing an increasing pressure on their water resources to guarantee safe and sufficient water access. Water managers often use tried and tested strategies like large supply augmentation infrastructure to address water problems. However, these projects do not address key problems and cause water conflicts. We conducted transdisciplinary research to show how water conflicts can change the development pathway of urban water systems by implementing alternative solutions.
Agathe Bucherie, Micha Werner, Marc van den Homberg, and Simon Tembo
Nat. Hazards Earth Syst. Sci., 22, 461–480,Short summary
Local communities in northern Malawi have well-developed knowledge of the conditions leading to flash floods, spatially and temporally. Scientific analysis of catchment geomorphology and global reanalysis datasets corroborates this local knowledge, underlining the potential of these large-scale scientific datasets. Combining local knowledge with contemporary scientific datasets provides a common understanding of flash flood events, contributing to a more people-centred warning to flash floods.
Faith Ka Shun Chan, Liang Emlyn Yang, Gordon Mitchell, Nigel Wright, Mingfu Guan, Xiaohui Lu, Zilin Wang, Burrell Montz, and Olalekan Adekola
Nat. Hazards Earth Syst. Sci. Discuss.,
Revised manuscript under review for NHESSShort summary
Sustainable flood risk management (SFRM) has become popular since the 1980s. This study examines the past and present flood management experiences in four developed countries (the UK, NL, US and Japan) that frequently suffered floods. We analysed ways towards the SFRM among Asian coastal cities, which are still reliant on hard-engineering approach that is insufficient reducing future flood risk. We recommend stakeholders adopting “mixed options” to undertake “sustainability” in FRM practices.
Veit Blauhut, Michael Stoelzle, Lauri Ahopelto, Manuela I. Brunner, Claudia Teutschbein, Doris E. Wendt, Vytautas Akstinas, Sigrid J. Bakke, Lucy J. Barker, Lenka Bartošová, Agrita Briede, Carmelo Cammalleri, Lucia De Stefano, Miriam Fendeková, David C. Finger, Marijke Huysmans, Mirjana Ivanov, Jaak Jaagus, Jiří Jakubínský, Ksenija Cindrić Kalin, Svitlana Krakovska, Gregor Laaha, Monika Lakatos, Kiril Manevski, Mathias Neumann Andersen, Nina Nikolova, Marzena Osuch, Pieter van Oel, Kalina Radeva, Renata J. Romanowicz, Elena Toth, Mirek Trnka, Marko Urošev, Julia Urquijo Reguera, Eric Sauquet, Silvana Stevkova, Lena M. Tallaksen, Iryna Trofimova, Michelle T. H. van Vliet, Jean-Philippe Vidal, Niko Wanders, Micha Werner, Patrick Willems, and Nenad Živković
Nat. Hazards Earth Syst. Sci. Discuss.,
Revised manuscript accepted for NHESSShort summary
Recent drought events caused enormous damages in Europe. We therefore questioned the existence and effect of current drought management strategies on the actual impacts, and how drought is perceived by relevant stakeholders. Over 700 participant from 28 European countries provided insights to drought hazard and impact perception, and current management strategies. The study concludes with an urgent need to collectively combat drought risk via an European macro-level drought governance approach.
Silvana Bolaños Chavarría, Micha Werner, and Juan Fernando Salazar
Hydrol. Earth Syst. Sci. Discuss.,
Preprint under review for HESSShort summary
Using total water storage (TWS) from GRACE satellites, we assess the reliability of global hydrological and land surface models over a medium-sized tropical basin with a well-developed gauging network. We find the models poorly represent TWS for the monthly series, but they improve in representing seasonality and long-term trends. We conclude that GRACE provides a valuable dataset to benchmark global simulations of TWS change, offering a useful tool to improve global models in tropical basins.
Jonatan Godinez-Madrigal, Nora Van Cauwenbergh, and Pieter van der Zaag
Hydrol. Earth Syst. Sci., 24, 4903–4921,Short summary
Our research studies whether science depoliticizes water conflicts or instead conflicts politicize science–policy processes. We analyze a water conflict due to the development of large infrastructure. We interviewed key actors in the conflict and replicated the results of water resources models developed to solve the conflict. We found that knowledge produced in isolation has no positive effect in transforming the conflict; instead, its potential could be enhanced if produced collaboratively.
Alexander Kaune, Faysal Chowdhury, Micha Werner, and James Bennett
Hydrol. Earth Syst. Sci., 24, 3851–3870,Short summary
This paper was developed from PhD research focused on assessing the value of using hydrological datasets in water resource management. Previous studies have assessed how well data can help in predicting river flows, but there is a lack of knowledge of how well data can help in water allocation decisions. In our research, it was found that using seasonal streamflow forecasts improves the available water estimates, resulting in better water allocation decisions in a highly regulated basin.
Alexander Kaune, Micha Werner, Patricia López López, Erasmo Rodríguez, Poolad Karimi, and Charlotte de Fraiture
Hydrol. Earth Syst. Sci., 23, 2351–2368,Short summary
The value of using longer periods of record of river discharge information from global precipitation datasets is assessed for irrigation area planning. Results show that for all river discharge simulations the benefit of choosing the irrigated area based on the 30 years of simulated data is higher compared to using only 5 years of observed discharge data. Hence, irrigated areas can be better planned using 30 years of river discharge information from global precipitation datasets.
Clara Linés, Ana Iglesias, Luis Garrote, Vicente Sotés, and Micha Werner
Hydrol. Earth Syst. Sci., 22, 5901–5917,Short summary
In this paper we follow a user-based approach to examine operational drought management decisions and how the role of information on them can be assessed. The approach combines a stakeholder consultation and a decision model representing the interrelated decisions of the irrigation association and farmers. The decision model was extended to include information on snow cover from satellite. This contributed to better decisions in the simulation and ultimately higher benefits for the farmers.
Gaby J. Gründemann, Micha Werner, and Ted I. E. Veldkamp
Hydrol. Earth Syst. Sci., 22, 4667–4683,Short summary
Flooding in vulnerable and data-sparse regions such as the Limpopo basin in Southern Africa is a key concern. Data available to local flood managers are often limited, inconsistent or asymmetrically distributed. We demonstrate that freely available global datasets are well suited to provide essential information. Despite the poor performance of simulated discharges, these datasets hold potential in identifying damaging flood events, particularly for higher-resolution datasets and larger basins.
María Carolina Rogelis and Micha Werner
Hydrol. Earth Syst. Sci., 22, 853–870,Short summary
Numerical weather prediction (NWP) models are fundamental for flood early warning, particularly in tropical mountainous watersheds. This paper aims to assess the potential of NWP for flood early warning purposes, and the possible improvement that the post-processing of forecasts can provide, in a tropical mountainous area. The results show the potential of NWP but also the need for more detailed evaluation of the meteorological model in the study area.
Jonatan Godinez Madrigal, Pieter van der Zaag, and Nora van Cauwenbergh
Proc. IAHS, 376, 57–62,Short summary
A part of the population of Mexico is undergoing severe water crises vis-a-vis with the quantity and quality of water. The water authority's strategy dwells solely in infrastructure development to tackle the symptoms, not the causes. The paper summarizes how the causes of crises lie not in the lack of infrastructure but in a deficient management and governance. I did the research because I'd to influence on policy, and I did it through fieldwork and critical literature review.
Clara Linés, Micha Werner, and Wim Bastiaanssen
Hydrol. Earth Syst. Sci., 21, 4747–4765,Short summary
This paper aims at identifying Earth observation data sets that can help river basin managers detect drought conditions that may lead to impacts early enough to take mitigation actions. Six remote sensing products were assessed using two types of impact data as a benchmark: media records from a regional newspaper and crop yields. Precipitation, vegetation condition and evapotranspiration products showed the best results, offering early signs of impacts up to 6 months before the reported damages.
Tesfay G. Gebremicael, Yasir A. Mohamed, Pieter van der Zaag, Amdom G. Berhe, Gebremedhin G. Haile, Eyasu Y. Hagos, and Mulubrhan K. Hagos
Hydrol. Earth Syst. Sci. Discuss.,
Manuscript not accepted for further reviewShort summary
Eight satellite-based rainfall products were evaluated using a comprehensive approach against rain gauge networks over the complex topography of the upper Tekeze-Atbara tributary of the Nile basin. Results showed that CHIRPS, TRMM, and RFEv2 performed well and were able to capture the ground rainfall compared to the remaining five products. Unlike in temporal scale, the performance of the products did not show a uniform pattern with respect to spatial scale.
Tesfay G. Gebremicael, Yasir A. Mohamed, Pieter v. Zaag, and Eyasu Y. Hagos
Hydrol. Earth Syst. Sci., 21, 2127–2142,Short summary
This study was conducted to understand the spatio-temporal variations of streamflow in the Tekezē basin. Results showed rainfall over the basin did not significantly change. However, streamflow experienced high variabilities at seasonal and annual scales. Further studies are needed to verify hydrological changes by identifying the physical mechanisms behind those changes. Findings are useful as prerequisite for studying the effects of catchment management dynamics on the hydrological processes.
María Carolina Rogelis, Micha Werner, Nelson Obregón, and Nigel Wright
Nat. Hazards Earth Syst. Sci., 16, 833–853,Short summary
A method to identify mountainous watersheds with the highest flood risk at the regional level is proposed and applied in Bogotá (Colombia). Vulnerability at the regional level was assessed and combined with an existing flood susceptibility indicator, thus providing an index that allows the watersheds to be prioritised. Results show that vulnerability can be expressed in terms of four constituent indicators and a sensitivity analysis shows that the classification of vulnerability is robust.
María Carolina Rogelis, Micha Werner, Nelson Obregón, and Nigel Wright
Hydrol. Earth Syst. Sci. Discuss.,
Manuscript not accepted for further reviewShort summary
A distributed model (TETIS), a semi-distributed model (TOPMODEL) and a lumped model (HEC HMS soil moisture accounting) were used to simulate the discharge response of a tropical high mountain basin. Performance analysis and diagnostics were carried out in order to identify the most appropriate model for the study area for flood early warning. The results show that TOPMODEL is the most realistic model of the three tested.
F. A. Zimale, M. A. Mogus, M. L. Alemu, E. K. Ayana, S. S. Demissie, S. A. Tilahun, and T. S. Steenhuis
Manuscript not accepted for further reviewShort summary
Sediment impact on tropical lakes is not well known, because of lack of data. In this study we extent the limited available data by first modeling the hydrology with saturation excess model. Then based on the flow prediction we predict sediment concentrations and loads. We found that yearly over 90% of the 16 million ton (lower bound) or more likely 37 million ton generated in the 12,000 square km Lake Tana watershed in Ethiopia is trapped on the flood plains and in lake.
P. Trambauer, M. Werner, H. C. Winsemius, S. Maskey, E. Dutra, and S. Uhlenbrook
Hydrol. Earth Syst. Sci., 19, 1695–1711,
A. M. L. Saraiva Okello, I. Masih, S. Uhlenbrook, G. P. W. Jewitt, P. van der Zaag, and E. Riddell
Hydrol. Earth Syst. Sci., 19, 657–673,Short summary
We studied long-term daily records of rainfall and streamflow of the Incomati River basin in southern Africa. We used statistical analysis and the Indicators of Hydrologic Alteration tool to describe the spatial and temporal variability flow regime. We found significant declining trends in October flows, and low flow indicators; however, no significant trend was found in rainfall. Land use and flow regulation are larger drivers of temporal changes in streamflow than climatic forces in the basin.
A. W. Worqlul, B. Maathuis, A. A. Adem, S. S. Demissie, S. Langan, and T. S. Steenhuis
Hydrol. Earth Syst. Sci., 18, 4871–4881,
M. C. Rogelis and M. Werner
Nat. Hazards Earth Syst. Sci., 14, 3043–3064,Short summary
A method for assessing regional debris flow susceptibility at the watershed scale, based on an index composed of a morphometric indicator and a land cover indicator, is proposed and applied in 106 peri-urban mountainous watersheds in Bogota, Colombia. The indicator of debris flow susceptibility is obtained from readily available information common to most peri-urban mountainous areas and can be used to prioritise watersheds that can subsequently be subjected to detailed hazard analysis.
P. Trambauer, S. Maskey, M. Werner, F. Pappenberger, L. P. H. van Beek, and S. Uhlenbrook
Hydrol. Earth Syst. Sci., 18, 2925–2942,
J. K. Kiptala, M. L. Mul, Y. A. Mohamed, and P. van der Zaag
Hydrol. Earth Syst. Sci., 18, 2287–2303,
H. H. G. Savenije, A. Y. Hoekstra, and P. van der Zaag
Hydrol. Earth Syst. Sci., 18, 319–332,
P. Trambauer, E. Dutra, S. Maskey, M. Werner, F. Pappenberger, L. P. H. van Beek, and S. Uhlenbrook
Hydrol. Earth Syst. Sci., 18, 193–212,
Related subject area
Subject: Catchment hydrology | Techniques and Approaches: Remote Sensing and GISA combined use of in situ and satellite-derived observations to characterize surface hydrology and its variability in the Congo River basinMonitoring surface water dynamics in the Prairie Pothole Region of North Dakota using dual-polarised Sentinel-1 synthetic aperture radar (SAR) time seriesWatershed zonation through hillslope clustering for tractably quantifying above- and below-ground watershed heterogeneity and functionsClimatic and anthropogenic drivers of a drying Himalayan riverOn the selection of precipitation products for the regionalisation of hydrological model parametersDischarge of groundwater flow to Potter Cove on King George Island, Antarctic PeninsulaThe value of ASCAT soil moisture and MODIS snow cover data for calibrating a conceptual hydrologic modelSystematic comparison of five machine-learning models in classification and interpolation of soil particle size fractions using different transformed dataUsing hydrological and climatic catchment clusters to explore drivers of catchment behaviorUsing MODIS estimates of fractional snow cover area to improve streamflow forecasts in interior AlaskaInforming a hydrological model of the Ogooué with multi-mission remote sensing dataSpatial characterization of long-term hydrological change in the Arkavathy watershed adjacent to Bangalore, IndiaSpatial pattern evaluation of a calibrated national hydrological model – a remote-sensing-based diagnostic approachA method to employ the spatial organization of catchments into semi-distributed rainfall–runoff modelsMulti-source hydrological soil moisture state estimation using data fusion optimisationTemporal and spatial evaluation of satellite-based rainfall estimates across the complex topographical and climatic gradients of ChileDaily Landsat-scale evapotranspiration estimation over a forested landscape in North Carolina, USA, using multi-satellite data fusionUsing object-based geomorphometry for hydro-geomorphological analysis in a Mediterranean research catchmentComparing the Normalized Difference Infrared Index (NDII) with root zone storage in a lumped conceptual modelCase-based knowledge formalization and reasoning method for digital terrain analysis – application to extracting drainage networksImproved large-scale hydrological modelling through the assimilation of streamflow and downscaled satellite soil moisture observationsVegetative impacts upon bedload transport capacity and channel stability for differing alluvial planforms in the Yellow River source zoneEvaluation of global fine-resolution precipitation products and their uncertainty quantification in ensemble discharge simulationsMultidecadal change in streamflow associated with anthropogenic disturbances in the tropical AndesIntegration of 2-D hydraulic model and high-resolution lidar-derived DEM for floodplain flow modelingRelating seasonal dynamics of enhanced vegetation index to the recycling of water in two endorheic river basins in north-west ChinaUrbanization dramatically altered the water balances of a paddy field-dominated basin in southern ChinaGRACE storage-runoff hystereses reveal the dynamics of regional watershedsImpacts of high inter-annual variability of rainfall on a century of extreme hydrologic regime of northwest AustraliaIdentification of catchment functional units by time series of thermal remote sensing imagesEvaluating digital terrain indices for soil wetness mapping – a Swedish case studyThe suitability of remotely sensed soil moisture for improving operational flood forecastingModelling stream flow and quantifying blue water using a modified STREAM model for a heterogeneous, highly utilized and data-scarce river basin in AfricaOperational reservoir inflow forecasting with radar altimetry: the Zambezi case studyThree perceptions of the evapotranspiration landscape: comparing spatial patterns from a distributed hydrological model, remotely sensed surface temperatures, and sub-basin water balancesAssessment of waterlogging in agricultural megaprojects in the closed drainage basins of the Western Desert of EgyptEstimating water discharge from large radar altimetry datasetsEstimation of antecedent wetness conditions for flood modelling in northern MoroccoMODIS snow cover mapping accuracy in a small mountain catchment – comparison between open and forest sitesThe AACES field experiments: SMOS calibration and validation across the Murrumbidgee River catchmentA soil moisture and temperature network for SMOS validation in Western DenmarkClassification and flow prediction in a data-scarce watershed of the equatorial Nile regionOn the use of AMSU-based products for the description of soil water content at basin scaleEstimating flooded area and mean water level using active and passive microwaves: the example of Paraná River Delta floodplainAssimilating SAR-derived water level data into a hydraulic model: a case studyEstimation of soil moisture using trapezoidal relationship between remotely sensed land surface temperature and vegetation indexEstimation of surface soil moisture and roughness from multi-angular ASAR imagery in the Watershed Allied Telemetry Experimental Research (WATER)Assessment of satellite rainfall products for streamflow simulation in medium watersheds of the Ethiopian highlandsThe topographic signature of Quaternary tectonic uplift in the Ardennes massif (Western Europe)Phenological response of vegetation to upstream river flow in the Heihe Rive basin by time series analysis of MODIS data
Benjamin Kitambo, Fabrice Papa, Adrien Paris, Raphael M. Tshimanga, Stephane Calmant, Ayan Santos Fleischmann, Frederic Frappart, Melanie Becker, Mohammad J. Tourian, Catherine Prigent, and Johary Andriambeloson
Hydrol. Earth Syst. Sci., 26, 1857–1882,Short summary
This study presents a better characterization of surface hydrology variability in the Congo River basin, the second largest river system in the world. We jointly use a large record of in situ and satellite-derived observations to monitor the spatial distribution and different timings of the Congo River basin's annual flood dynamic, including its peculiar bimodal pattern.
Stefan Schlaffer, Marco Chini, Wouter Dorigo, and Simon Plank
Hydrol. Earth Syst. Sci., 26, 841–860,Short summary
Prairie wetlands are important for biodiversity and water availability. Knowledge about their variability and spatial distribution is of great use in conservation and water resources management. In this study, we propose a novel approach for the classification of small water bodies from satellite radar images and apply it to our study area over 6 years. The retrieved dynamics show the different responses of small and large wetlands to dry and wet periods.
Haruko M. Wainwright, Sebastian Uhlemann, Maya Franklin, Nicola Falco, Nicholas J. Bouskill, Michelle E. Newcomer, Baptiste Dafflon, Erica R. Siirila-Woodburn, Burke J. Minsley, Kenneth H. Williams, and Susan S. Hubbard
Hydrol. Earth Syst. Sci., 26, 429–444,Short summary
This paper has developed a tractable approach for characterizing watershed heterogeneity and its relationship with key functions such as ecosystem sensitivity to droughts and nitrogen export. We have applied clustering methods to classify hillslopes into
watershed zonesthat have distinct distributions of bedrock-to-canopy properties as well as key functions. This is a powerful approach for guiding watershed experiments and sampling as well as informing hydrological and biogeochemical models.
Gopal Penny, Zubair A. Dar, and Marc F. Müller
Hydrol. Earth Syst. Sci., 26, 375–395,Short summary
We develop an empirical approach to attribute declining streamflow in the Upper Jhelum watershed, a key subwatershed of the transboundary Indus basin. We find that a loss of streamflow since the year 2000 resulted primarily due to interactions among vegetation and groundwater in response to climate rather than local changes in land use, revealing the climate sensitivity of this Himalayan watershed.
Oscar M. Baez-Villanueva, Mauricio Zambrano-Bigiarini, Pablo A. Mendoza, Ian McNamara, Hylke E. Beck, Joschka Thurner, Alexandra Nauditt, Lars Ribbe, and Nguyen Xuan Thinh
Hydrol. Earth Syst. Sci., 25, 5805–5837,Short summary
Most rivers worldwide are ungauged, which hinders the sustainable management of water resources. Regionalisation methods use information from gauged rivers to estimate streamflow over ungauged ones. Through hydrological modelling, we assessed how the selection of precipitation products affects the performance of three regionalisation methods. We found that a precipitation product that provides the best results in hydrological modelling does not necessarily perform the best for regionalisation.
Ulrike Falk and Adrián Silva-Busso
Hydrol. Earth Syst. Sci., 25, 3227–3244,Short summary
This paper focuses on the groundwater flow aspects of a small hydrological catchment at the northern tip of the Antarctic Peninsula. This region has experienced drastic climatological changes in the recent past. The basin is representative for the rugged coastline of the peninsula. It is discussed as a case study for possible future evolution of similar basins further south. Results include a quantitative analysis of glacial and groundwater contribution to total discharge into coastal waters.
Rui Tong, Juraj Parajka, Andreas Salentinig, Isabella Pfeil, Jürgen Komma, Borbála Széles, Martin Kubáň, Peter Valent, Mariette Vreugdenhil, Wolfgang Wagner, and Günter Blöschl
Hydrol. Earth Syst. Sci., 25, 1389–1410,Short summary
We used a new and experimental version of the Advanced Scatterometer (ASCAT) soil water index data set and Moderate Resolution Imaging Spectroradiometer (MODIS) C6 snow cover products for multiple objective calibrations of the TUWmodel in 213 catchments of Austria. Combined calibration to runoff, satellite soil moisture, and snow cover improves runoff (40 % catchments), soil moisture (80 % catchments), and snow (~ 100 % catchments) simulation compared to traditional calibration to runoff only.
Mo Zhang, Wenjiao Shi, and Ziwei Xu
Hydrol. Earth Syst. Sci., 24, 2505–2526,Short summary
We systematically compared 45 models for direct and indirect soil texture classification and soil particle size fraction interpolation based on 5 machine-learning models and 3 log-ratio transformation methods. Random forest showed powerful performance in both classification of imbalanced data and regression assessment. Extreme gradient boosting is more meaningful and computationally efficient when dealing with large data sets. The indirect classification and log-ratio methods are recommended.
Florian U. Jehn, Konrad Bestian, Lutz Breuer, Philipp Kraft, and Tobias Houska
Hydrol. Earth Syst. Sci., 24, 1081–1100,Short summary
We grouped 643 rivers from the United States into 10 behavioral groups based on their hydrological behavior (e.g., how much water they transport overall). Those groups are aligned with the ecoregions in the United States. Depending on the groups’ location and other characteristics, either snow, aridity or seasonality is most important for the behavior of the rivers in a group. We also find that very similar river behavior can be found in rivers far apart and with different characteristics.
Katrina E. Bennett, Jessica E. Cherry, Ben Balk, and Scott Lindsey
Hydrol. Earth Syst. Sci., 23, 2439–2459,Short summary
Remotely sensed snow observations may improve operational streamflow forecasting in remote regions, such as Alaska. In this study, we insert remotely sensed observations of snow extent into the operational framework employed by the US National Weather Service’s Alaska Pacific River Forecast Center. Our work indicates that the snow observations can improve snow estimates and streamflow forecasting. This work provides direction for forecasters to implement remote sensing in their operations.
Cecile M. M. Kittel, Karina Nielsen, Christian Tøttrup, and Peter Bauer-Gottwein
Hydrol. Earth Syst. Sci., 22, 1453–1472,Short summary
In this study, we integrate free, global Earth observations in a user-friendly and flexible model to reliably characterize an otherwise unmonitored river basin. The proposed model is the best baseline characterization of the Ogooué basin in light of available observations. Furthermore, the study shows the potential of using new, publicly available Earth observations and a suitable model structure to obtain new information in poorly monitored or remote areas and to support user requirements.
Gopal Penny, Veena Srinivasan, Iryna Dronova, Sharachchandra Lele, and Sally Thompson
Hydrol. Earth Syst. Sci., 22, 595–610,Short summary
Water resources in the Arkavathy watershed in southern India are changing due to human modification of the landscape, including changing agricultural practices and urbanization. We analyze surface water resources in man-made lakes in satellite imagery over a period of 4 decades and find drying in the northern part of the watershed (characterized by heavy agriculture) and wetting downstream of urban areas. Drying in the watershed is associated with groundwater-irrigated agriculture.
Gorka Mendiguren, Julian Koch, and Simon Stisen
Hydrol. Earth Syst. Sci., 21, 5987–6005,Short summary
The present study is focused on the spatial pattern evaluation of two models and describes the similarities and dissimilarities. It also discusses the factors that generate these patterns and proposes similar new approaches to minimize the differences. The study points towards a new approach in which the spatial component of the hydrological model is also calibrated and taken into account.
Henning Oppel and Andreas Schumann
Hydrol. Earth Syst. Sci., 21, 4259–4282,Short summary
How can we evaluate the heterogeneity of natural watersheds and how can we assess its spatial organization? How can we make use of this information for hydrological models and is it beneficial to our models? We propose a method display and assess the interaction of catchment characteristics with the flow path which we defined as the ordering scheme within a basin. A newly implemented algorithm brings this information to the set-up of a model and our results show an increase in model performance.
Lu Zhuo and Dawei Han
Hydrol. Earth Syst. Sci., 21, 3267–3285,Short summary
Reliable estimation of hydrological soil moisture state is of critical importance in operational hydrology to improve the flood prediction and hydrological cycle description. This paper attempts for the first time to build a soil moisture product directly applicable to hydrology using multiple data sources retrieved from remote sensing and land surface modelling. The result shows a significant improvement of the soil moisture state accuracy; the method can be easily applied in other catchments.
Mauricio Zambrano-Bigiarini, Alexandra Nauditt, Christian Birkel, Koen Verbist, and Lars Ribbe
Hydrol. Earth Syst. Sci., 21, 1295–1320,Short summary
This work exhaustively evaluates – for the first time – the suitability of seven state-of-the-art satellite-based rainfall estimates (SREs) over the complex topography and diverse climatic gradients of Chile. Several indices of performance are used for different timescales and elevation zones. Our analysis reveals what SREs are in closer agreement to ground-based observations and what indices allow for understanding mismatches in shape, magnitude, variability and intensity of precipitation.
Yun Yang, Martha C. Anderson, Feng Gao, Christopher R. Hain, Kathryn A. Semmens, William P. Kustas, Asko Noormets, Randolph H. Wynne, Valerie A. Thomas, and Ge Sun
Hydrol. Earth Syst. Sci., 21, 1017–1037,Short summary
This work explores the utility of a thermal remote sensing based MODIS/Landsat ET data fusion procedure over a mixed forested/agricultural landscape in North Carolina, USA. The daily ET retrieved at 30 m resolution agreed well with measured fluxes in a clear-cut and a mature pine stand. An accounting of consumptive water use by land cover classes is presented, as well as relative partitioning of ET between evaporation (E) and transpiration (T) components.
Domenico Guida, Albina Cuomo, and Vincenzo Palmieri
Hydrol. Earth Syst. Sci., 20, 3493–3509,Short summary
The authors apply an object-based geomorphometric procedure to define the runoff contribution areas. The results enabled us to identify the contribution area related to the different runoff components activated during the storm events through an advanced hydro-chemical analysis. This kind of approach could be useful applied to similar, rainfall-dominated, forested and no-karst Mediterranean catchments.
Nutchanart Sriwongsitanon, Hongkai Gao, Hubert H. G. Savenije, Ekkarin Maekan, Sirikanya Saengsawang, and Sansarith Thianpopirug
Hydrol. Earth Syst. Sci., 20, 3361–3377,Short summary
We demonstrated that the readily available NDII remote sensing product is a very useful proxy for moisture storage in the root zone of vegetation. We compared the temporal variation of the NDII with the root zone storage in a hydrological model of eight catchments in the Upper Ping River in Thailand, yielding very good results. Having a reliable NDII product that can help us to estimate the actual moisture storage in catchments is a major contribution to prediction in ungauged basins.
Cheng-Zhi Qin, Xue-Wei Wu, Jing-Chao Jiang, and A-Xing Zhu
Hydrol. Earth Syst. Sci., 20, 3379–3392,Short summary
Application of digital terrain analysis (DTA), which is typically a modeling process involving workflow building, relies heavily on DTA domain knowledge. However, the DTA knowledge has not been formalized well to be available for inference in automatic tools. We propose a case-based methodology to solve this problem. This methodology can also be applied to other domains of geographical modeling with a similar situation.
Patricia López López, Niko Wanders, Jaap Schellekens, Luigi J. Renzullo, Edwin H. Sutanudjaja, and Marc F. P. Bierkens
Hydrol. Earth Syst. Sci., 20, 3059–3076,Short summary
We perform a joint assimilation experiment of high-resolution satellite soil moisture and discharge observations in the Murrumbidgee River basin with a large-scale hydrological model. Additionally, we study the impact of high- and low-resolution meteorological forcing on the model performance. We show that the assimilation of high-resolution satellite soil moisture and discharge observations has a significant impact on discharge simulations and can bring them closer to locally calibrated models.
Zhi Wei Li, Guo An Yu, Gary Brierley, and Zhao Yin Wang
Hydrol. Earth Syst. Sci., 20, 3013–3025,Short summary
Influence of vegetation upon bedload transport and channel morphodynamics is examined along a channel stability gradient ranging from meandering to anabranching to anabranching–braided to fully braided planform conditions along trunk and tributary reaches of the Yellow River source zone in western China. This innovative work reveals complex interactions between channel planform, bedload transport capacity, sediment supply in the flood season, and the hydraulic role of vegetation.
W. Qi, C. Zhang, G. Fu, C. Sweetapple, and H. Zhou
Hydrol. Earth Syst. Sci., 20, 903–920,Short summary
Six precipitation products, including TRMM3B42, TRMM3B42RT, GLDAS/Noah, APHRODITE, PERSIANN, and GSMAP-MVK+, are investigated in the usually neglected area of NE China, and a framework is developed to quantify the contributions of uncertainties from precipitation products, hydrological models, and their interactions to uncertainty in simulated discharges. It is found that interactions between hydrological models and precipitation products contribute significantly to uncertainty in discharge.
A. Molina, V. Vanacker, E. Brisson, D. Mora, and V. Balthazar
Hydrol. Earth Syst. Sci., 19, 4201–4213,Short summary
Andean catchments play a key role in the provision of freshwater resources. The development of megacities in the inter-Andean valleys raises severe concerns about growing water scarcity. This study is one of the first long-term (1970s-now) analyses of the role of land cover and climate change on provision and regulation of streamflow in the tropical Andes. Forest conversion had the largest impact on streamflow, leading to a 10 % net decrease in streamflow over the last 40 years.
D. Shen, J. Wang, X. Cheng, Y. Rui, and S. Ye
Hydrol. Earth Syst. Sci., 19, 3605–3616,
M. A. Matin and C. P.-A. Bourque
Hydrol. Earth Syst. Sci., 19, 3387–3403,Short summary
This paper describes a methodology in analysing the interdependencies between components of the hydrological cycle and vegetation characteristics at different elevation zones of two endorheic river basins in an arid-mountainous region of NW China. The analysis shows that oasis vegetation has an important function in sustaining the water cycle in the river basins and oasis vegetation is dependent on surface and shallow subsurface water flow from mountain sources.
L. Hao, G. Sun, Y. Liu, J. Wan, M. Qin, H. Qian, C. Liu, J. Zheng, R. John, P. Fan, and J. Chen
Hydrol. Earth Syst. Sci., 19, 3319–3331,Short summary
The role of land cover in affecting hydrologic and environmental changes in the humid region in southern China is not well studied. We found that high flows and low flows increased and evapotranspiration decreased due to urbanization in the Qinhuai River basin. Urbanization masked climate warming effects in a rice-paddy-dominated watershed in altering long-term hydrology. Flooding risks and heat island effects are expected to rise due to urbanization.
E. A. Sproles, S. G. Leibowitz, J. T. Reager, P. J. Wigington Jr, J. S. Famiglietti, and S. D. Patil
Hydrol. Earth Syst. Sci., 19, 3253–3272,Short summary
The paper demonstrates how data from the Gravity Recovery and Climate Experiment (GRACE) can be used to describe the relationship between water stored at the regional scale and stream flow. Additionally, we employ GRACE as a regional-scale indicator to successfully predict stream flow later in the water year. Our work focuses on the Columbia River Basin (North America), but is widely applicable across the globe, and could prove to be particularly useful in regions with limited hydrological data.
A. Rouillard, G. Skrzypek, S. Dogramaci, C. Turney, and P. F. Grierson
Hydrol. Earth Syst. Sci., 19, 2057–2078,Short summary
We reconstructed a 100-year monthly history of flooding and drought of a large wetland in arid northwest Australia, using hydroclimatic data calibrated against 25 years of satellite images. Severe and intense regional rainfall, as well as the sequence of events, determined surface water expression on the floodplain. While inter-annual variability was high, changes to the flood regime over the last 20 years suggest the wetland may become more persistent in response to the observed rainfall trend.
B. Müller, M. Bernhardt, and K. Schulz
Hydrol. Earth Syst. Sci., 18, 5345–5359,Short summary
We present a method to define hydrological landscape units by a time series of thermal infrared satellite data. Land surface temperature is calculated for 28 images in 12 years for a catchment in Luxembourg. Pattern measures show spatio-temporal persistency; principle component analysis extracts relevant patterns. Functional units represent similar behaving entities based on a representative set of images. Resulting classification and patterns are discussed regarding potential applications.
A. M. Ågren, W. Lidberg, M. Strömgren, J. Ogilvie, and P. A. Arp
Hydrol. Earth Syst. Sci., 18, 3623–3634,
N. Wanders, D. Karssenberg, A. de Roo, S. M. de Jong, and M. F. P. Bierkens
Hydrol. Earth Syst. Sci., 18, 2343–2357,
J. K. Kiptala, M. L. Mul, Y. A. Mohamed, and P. van der Zaag
Hydrol. Earth Syst. Sci., 18, 2287–2303,
C. I. Michailovsky and P. Bauer-Gottwein
Hydrol. Earth Syst. Sci., 18, 997–1007,
T. Conradt, F. Wechsung, and A. Bronstert
Hydrol. Earth Syst. Sci., 17, 2947–2966,
M. El Bastawesy, R. Ramadan Ali, A. Faid, and M. El Osta
Hydrol. Earth Syst. Sci., 17, 1493–1501,
A. C. V. Getirana and C. Peters-Lidard
Hydrol. Earth Syst. Sci., 17, 923–933,
Y. Tramblay, R. Bouaicha, L. Brocca, W. Dorigo, C. Bouvier, S. Camici, and E. Servat
Hydrol. Earth Syst. Sci., 16, 4375–4386,
J. Parajka, L. Holko, Z. Kostka, and G. Blöschl
Hydrol. Earth Syst. Sci., 16, 2365–2377,
S. Peischl, J. P. Walker, C. Rüdiger, N. Ye, Y. H. Kerr, E. Kim, R. Bandara, and M. Allahmoradi
Hydrol. Earth Syst. Sci., 16, 1697–1708,
S. Bircher, N. Skou, K. H. Jensen, J. P. Walker, and L. Rasmussen
Hydrol. Earth Syst. Sci., 16, 1445–1463,
J.-M. Kileshye Onema, A. E. Taigbenu, and J. Ndiritu
Hydrol. Earth Syst. Sci., 16, 1435–1443,
S. Manfreda, T. Lacava, B. Onorati, N. Pergola, M. Di Leo, M. R. Margiotta, and V. Tramutoli
Hydrol. Earth Syst. Sci., 15, 2839–2852,
M. Salvia, F. Grings, P. Ferrazzoli, V. Barraza, V. Douna, P. Perna, C. Bruscantini, and H. Karszenbaum
Hydrol. Earth Syst. Sci., 15, 2679–2692,
L. Giustarini, P. Matgen, R. Hostache, M. Montanari, D. Plaza, V. R. N. Pauwels, G. J. M. De Lannoy, R. De Keyser, L. Pfister, L. Hoffmann, and H. H. G. Savenije
Hydrol. Earth Syst. Sci., 15, 2349–2365,
W. Wang, D. Huang, X.-G. Wang, Y.-R. Liu, and F. Zhou
Hydrol. Earth Syst. Sci., 15, 1699–1712,
S. G. Wang, X. Li, X. J. Han, and R. Jin
Hydrol. Earth Syst. Sci., 15, 1415–1426,
M. M. Bitew and M. Gebremichael
Hydrol. Earth Syst. Sci., 15, 1147–1155,
N. Sougnez and V. Vanacker
Hydrol. Earth Syst. Sci., 15, 1095–1107,
L. Jia, H. Shang, G. Hu, and M. Menenti
Hydrol. Earth Syst. Sci., 15, 1047–1064,
Abera, G. B.: Estimating the water balance in the ungauged Omo-Ghibe basin, M.Sc. thesis, Hydraulic Enginering-River Basin Development, UNESCO-IHE, Delft, 109 pp., 2012.
Adnan, N. A. and Atkinson, P. M.: Exploring the impact of climate and land use changes on streamflow trends in a monsoon catchment, Int. J. Climatol., 31, 815–831, 2011.
Alemayehu, T., Furi, W., and Legesse, D.: Impact of water overexploitation on highland lakes of eastern ethiopia, Environ. Geol., 52, 147–154, 2007.
Anyamba, A.: From El Niño to La Niña: Vegetation Response Patterns over East and Southern Africa during the 1997–2000 Period, J. Climate, 15, 3096–3103, 2002.
Arnell, N., Bates, B., Lang, H., Magnusson, J. J., and Mulholland, P.: Climate Change 1995, Impacts, Adaptations and Mitigations of Climate Change: Scientific Technical Analyses, Cambridge University Press, Cambridge, 1996.
Assani, A. A., Quessy, J. F., Mesfioui, M., and Matteau, M.: An example of application: The ecological "natural flow regime" paradigm in hydroclimatology, Adv. Water Resour., 33, 537–545, 2010.
Avery, S.: Hydrological impacts of Ethiopia's Omo basin on Kenya's lake Turkana water levels & fisheries, Prepared for the African Development Bank, Tunis, 2010.
Beadle, L. C.: The inland waters of tropical Africa: An introduction to tropical limnology, Longman London, England, 1981.
Beavis, S. G., Zhang, L., Evans, J. P., Jakeman, A. J., and Smith, D. I.: Impacts and implications of farm dams on catchment hydrology: Methods and application to chafrey catchment, MODSIM 97 IMACSt, University of Tasmania, Hobart, 1997.
Bergonzini, L.: Bilans hydriques de lacs (Kivu, Tanganyika, Rukwa et Nyassa) du rift est-africain (Water balances of lakes Kivu, Tanganyika, Rukwa and Nyasa of the East African Rift), Annales des sciences géologiques/Musée Royal de l'Afrique Centrale in Tervuren, Belgique, 103, 1–183, 1998.
Birkett, C., Murtugudde, R., and Allan, T.: Indian Ocean climate event brings floods to East Africa's lakes and the Sudd Marsh, Geophys. Res. Lett., 26, 1031–1034, 1999.
Birkett, C. M.: The contribution of TOPEX/POSEIDON to the global monitoring of climatically sensitive lakes, J. Geophys. Res., 100, 25179–25904, 1995.
Borujeni, S. C. and Sulaiman, W. N. A.: Developments of L-Moment Based Models for Extreme Flood Events, Malaysian Journal of Mathematical Sciences, 3, 281–296, 2009.
Budyko, M. I.: Climate and Life, in: International geophysics series, edited by: Miller, D. H., English Ed. Academic Press, New York, 1974.
Carlisle, D. M., Falcone, J., Wolock, D. M., Meador, M. R., and Norris, R. H.: Predicting the natural flow regime: Models for assessing hydrological alteration in streams, River Res. Appl., 26, 118–136, 2010.
Cassardo, C. and Jones, J. A. A.: Managing water in a changing world, Water, 3, 618–628, https://doi.org/10.3390/w3020618, 2011.
Cheung, W. H., Senay, G. B., and Singh, A.: Trends and spatial distribution of annual and seasonal rainfall in Ethiopia, Int. J. Climatol., 28, 1723–1734, https://doi.org/10.1002/joc.1623, 2008.
Conway, D.: Extreme Rainfall Events and Lake Level Changes in East Africa: Recent Events and Historical Precedents, in: The East African Great Lakes: Limnology, Palaeolimnology and Biodiversity, edited by: Odada, E. O. and Olago, D. O., Kluwer Academic Publisher, the Netherlands, 62–92, 2002.
Crétaux, J. F., Letolle, R., and Kouraev, A.: Aral Sea Level Variability, The Handbook of Environmental Chemistry, edited by: Kostianov, A. G. and Kosarev, A. N., The Aral sea Environment, 181–193, 2010.
Crétaux, J.-F., Jelinski, W., Calmant, S., Kouraev, A., Vuglinski, V., Bergé-Nguyen, M., Gennero, M.-C., Nino, F., Abarca Del Rio, R., and Cazenave, A.: SOLS: A lake database to monitor in the Near Real Time water level and storage variations from remote sensing data, Adv. Space Res., 47, 1497–1507, 2011.
CSA: Summary and Statistical Report of the 2007 Population and Housing Census, FDRE Central Statistical Agency, Addis Ababa, 2007.
Dikbas, F., Firat, M., Koc, A. C., and Gungor, M.: Defining Homogeneous Regions for Streamflow Processes in Turkey Using a K-Means Clustering Method, Arab. J. Sci. Eng., 38, 1313–1319, https://doi.org/10.1007/s13369-013-0542-0, 2013.
Ebei, P. A., Oba, G., and Akuja, T.: Long-term impacts of droughts on pastoral production and trends in poverty in North-western Kenya: An evaluation of 14-year drought early warning data series, in: Droughts: Causes, effects and predictions, edited by: Sánchez, J. M., NOVA Science Publishers, Inc., New York, 103–138, 2008.
EEPCO: Gibe III Hydroelectric Project: Environmental and Social Management Plan, The Federal Democratic Republic of Ethiopia Ethiopian Electric Power Corporation, Addis Ababa, 2009.
EEPCO: Gilgel Gibe I Hydroelectric Project: Final Report on the Project Implementation, The Federal Democratic Republic of Ethiopia Ethiopian Electric Power Corporation, Addis Ababa, 2004a.
EEPCO: Gilgel Gibe II Hydro-Electric project, The Federal Democratic Republic of Ethiopia Ethiopian Electric Power Corporation, Addis Ababa, 2004b.
Emiru, N., Gebrekidan, H., and Tibebe, D.: Analysis of land use/land cover changes in western Ethiopian mixed crop-livestock systems: the case of Senbat watershed, Journal of Biodiversity and and Environmental Sciences (JBES), 2, 8–17, 2012.
ESA: GlobeCover, available at: http://due.esrin.esa.int/globcover/, last access: 15 August 2012, 2010.
FAO: Land Cover Classification System (LCCS), FAO, Rome, Italy, 2000.
Fissekis, A. D.: The Effects of Flow Regime and Land Use Practices on Ecological Health in the Grand Ronde Sub-basin, The Center for Watershed Sciences, California, 2007.
FDRE National Meteorological Agency: Climate change National Adaptation Programme of Action (NAPA) of Ethiopia, National Meteorological Agency, Addis Ababa, 2007.
Ferguson, A. J. D. and Harbott, B. J.: Geographical, physical and chemical aspects of Lake Turkana Overseas Development Administration, London, UK, 1–107, 1982.
Gottschalk, L.: Hydrological regionalization of Sweden, Hydrol. Sci. J., 30, 65–83, 1985.
Haines, A. T., Finlayson, B. I., and McMahon, T. A.: A global classification of river regimes, Appl. Geogr., 8, 255–272, 1988.
Hall, M. J. and Minns, A. W.: The classification of hydrologically homogeneous regions, Hydrol. Sci., 44, 693–704, 2009.
Hansen, M., DeFries, R., Townshend, J. R. G., and Sohlberg, R.: UMD Global Land Cover Classification, 1 Kilometer, 1.0, Department of Geography, University of Maryland, College Park, Maryland, 1981–1994, 1998.
Harris, N. M., Gurnell, M. A., Hannah, D. M., and Petts, G. E.: Classification of river regimes: a context for hydroecology, Hydrol. Process., 14, 2831–2848, 2000.
Hopson, A. J.: Lake Turkana, A Report on the Findings of the Lake Turkana Project, 1972–75, Overseas Development Administration, London, 1982.
Hosking, J. R. M.: L-moment: Analysis and estimation of distributions using linear combination of order statistics, J. Roy. Stat. Soc. B Met., 52, 105–124, 1990.
Hosking, J. R. M. and Wallis, J. R.: Regional skew in search of a parent, Water Resour. Res., 29, 1745–1752, 1993.
Hosking, J. R. M. and Wallis, J. R.: Regional frequency analysis: An approach based on L-moments, Cambridge univeristy press, Cambridge, UK, 1997.
Huh, S., Dickey, D. A., Meador, M. R., and Ruhl, K. E.: Temporal analysis of the frequency and duration of low and high streamflow: years of record needed to characterize streamflow variability, J. Hydrol., 310, 78–94, 2005.
Infoplease: Country maps – Africa, \textsuperscript\textcopyright 2000–2014 Pearson Education, publishing as Infoplease, available at: http://www.infoplease.com/atlas/africa.html (last access: 11 May 2012), 2012.
Kadukin, A. I. and Klige, R. K.: The water balance of the Caspian Sea and Aral Sea, in: Hydrology of Natural and manmade Lakes, Proceedings of the Vienna Symposium, Vienna, Austria, IAHS Publ. No. 206, 55–60, 1991.
Kendall, M. G.: Rank Correlation Methods, Book Series, Charles Griffin, Oxford University Press, USA, London, 1975.
Krasovkaia, I.: Entropy-based grouping of river flow regimes, J. Hydrol., 202, 173–191, 1997.
Lorup, J. K., Refsgaard, J. C., and Mazvimavi, D.: Assessing the effect of land use change on catchment runoff by combined use of statistical tests and hydrological modeling: case study from Zimbabwe, J. Hydrology, 205, 147–163, 1998.
Lytle, D. A. and Poff, N. L.: Adaptation to natural flow regimes, Trends Ecol. Evol., 19, 94–100, 2004.
Magole, L., Borgtoft Pedersen, H., and Klinte, L.: An Introduction to the Okavango Delta Management Plan, HOORC & DEA, Maun, Botswana, 2009.
Maidment, D. R. and Hersh, E. S.: Assessment of Hydrologic Alteration Software: FINAL REPORT Center for Research in Water Resources, The University of Texas at Austin, Austin, USA, 2006.
Mann, H. B.: Non-parametric test aganist trend, Econometrica, 13, 245–259, 1945.
Mao, D. and Cherkauer, K. A.: Impacts of land-use change on hydrologic responses in the Great Lakes region, J. Hydrol., 374, 71–82, 2009.
Masih, I., Maskey, S., Uhlenbrook, S., and Smakhtin, V.: Impact of upstream changes in rainfed agriculture on downstream flow in a semi-arid basin, Agr. Water Manage., 100, 36–45, https://doi.org/10.1016/j.agwat.2011.08.013, 2011.
Mercier, F., Cazenave, A., and Maheu, C.: Interannual lake level fluctuations (1993–1999) in Africa from Topex/Poseidon: connections with ocean–atmosphere interactions over the Indian Ocean, Global Planet. Change, 32, 141–163, https://doi.org/10.1016/S0921-8181(01)00139-4, 2002.
Mitchell, T. D. and Jones, P. D.: An improved method of constructing a database of monthly climate observations and associated high-resolution grids, Int. J. Climatol., 25, 693–712, 2005.
Monteith, J. L.: Evaporation and Environment, in: 19th Symposia of the Society for Experimental Biology, University Press, Cambridge, 19, 205–234, 1965.
Mu, Q., Zhao, M., and Running, S. W.: Improvements to a MODIS global terrestrial evapotranspiration algorithm, Remote Sens. Environ., 115, 1781–1800, 2011.
Nejadhashemi, A. P., Wardynski, B. J., and Munoz, J. D.: Evaluating the impacts of land use changes on hydrologic responses in the agricultural regions of Michigan and Wisconsin, Hydrol. Earth Syst. Sci. Discuss., 8, 3421–3468, https://doi.org/10.5194/hessd-8-3421-2011, 2011.
Newson, M. D.: Land, Water and Development: Sustainable Management of River Basin Systems, Routledge, London, 1997.
Ngaira, J. K.: Implications of climate change on the management of Rift Valley lakes in Kenya. The case of lake Baringo, in: Proceedings of the 11th World Lakes Conference, edited by: Odada, E. and Olago, D. O., 2, 133–138, 2006.
Ogallo, L.: Climate variability and change in Africa: a review of potential impacts on terrestrial water resources, in: Groundwater and Climate in Africa, Proceedings of the Kampala Conference, June 2008, Uganda, IAHS Publ. 334, 47–51, 2009.
Oki, T., Blyth, E. M., and Berbery, E. H.: Land Cover and Land use Change and their impacts on Hydroclimate, Ecosystems and Society, WCRP Open Science Conference, Denver, Colorado, 2011.
Olden, J. D. and Poff, N. L.: Redundancy and the Choice of Hydrologic Indices for Characterizing Streamflow Regimes, River Res. Appl., 19, 101–121, 2003.
Pikounis, M., Varanou, E., Baltas, E., Dassaklis, A., and Mimikou, M.: Application of the SWAT model in the Pinios river basin under different land-use scenarios, Global NEST J., 5, 71–79, 2003.
Poff, N. L. and Zimmerman, J. K.: Ecological responses to altered flow regimes: a literature review to inform the science and management of environmental flows, Freshwater Biol., 55, 194–205, 2010.
Poff, N. L., Allan, J. D., Bain, M. B., Karr, J. R., Prestegaard, K. L., Richter, B. D., Sparks, R. E., and Stomberg, J. C.: The natural flow regime. A paradigm for river conservation and restoration, BioScience, 47, 769–784, 1997.
Poff, N. L., Bledsoe, B. P., and Cuhaciyan, C. O.: Hydrologic variation with land use across the contiguous United States: Geomorphic and ecological consequences for stream ecosystems, Geomorphology, 79, 264–285, 2006.
Richter, B. D., Baumgartner, J. V., Powell, J., and Braun, D. P.: A method for assessing hydrologic alteration within ecosystems, Conserv. Biol., 10, 1163–1174, 1996.
Richter, B. D., Baumgartner, J. V., Wigington, R., and Braun, D. P.: How much water does a river need?, Freshwater Biol., 37, 231–249, 1997.
Rientjes, T. H. M., Haile, A. T., Kebede, E., Mannaerts, C. M. M., Habib, E., and Steenhuis, T. S.: Changes in land cover, rainfall and stream flow in Upper Gilgel Abbay catchment, Blue Nile basin – Ethiopia, Hydrol. Earth Syst. Sci., 15, 1979–1989, https://doi.org/10.5194/hess-15-1979-2011, 2011.
Risbey, J. S. and Entekhabi, D.: Observed Sacramento Basin streamflow response to precipitation and temperature changes and its relevance to climate impact studies, J. Hydrol., 184, 209–223, 1996.
Rost, S., Gerten, D., Bondeau, A., Lucht, W., Rohwer, J., and Schaphoff, S.: Agricultural green and blue water consumption and its influence on the global water system, Water Resour. Res., 44, 1–17, https://doi.org/10.1029/2007WR006331, 2008.
Sankarasubramanian, A., Vogel, R. M., and Limbrunner, J. F.: The Climate elasticity of streamflow in the United States, Water Resour. Res., 37, 1771–1781, 2001.
Sayed, M. A. A.: Eastern Nile Planning Model, Integration with IDEN Projects To Deal with Climate Change Uncertainty and Flooding Risk, Nile Basin Water Eng.'g Sci. Mag., 1, 86–93, 2008.
Schilling, K. E., Jha, M. K., Zhang, Y. K., Gassman, P. W., and Wolter, C. F.: Impact of land use and land cover change on the water balance of a large agricultural watershed: Historical effects and future directions, Water Resour. Res., 44, W00A09, https://doi.org/10.1029/2007WR006644, 2008.
Sen, P. K.: Estimates of the regression coefficient based on Kendall's tau, J. Am. Stat. Assoc., 63 1379–1389, 1968.
Sima, B. A.: Flow Regime and Land Cover Changes In the Didessa Sub-Basin of the Blue Nile River, South – Western Ethiopia, M.Sc. thesis, Department of Aquatic Science and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden, 63 pp., 2011.
Siriwardena, L., Finlayson, B. L., and McMahon, T. A.: The impact of land use change on catchment hydrology in large catchments: The Comet River, Central Queensland, Australia, J. Hydrol., 326, 199–214, 2006.
Stanford, J. A., Ward, J., Liss, W. J., Frissell, C. A., Williams, R. N., Lichatowich, J. A., and Coutant, C. C.: A general protocol for restoration of regulated rivers, Regul. River., 12, 391–413, 1996.
Survey of Kenya: National Atlas of Kenya, Nairobi, 15–21, 1977.
The Nature Conservancy: Indicators of Hydrologic Alteration Version 7.1 Uuser's Manual, The Nature Conservancy, 1–76, 2009.
Tomer, M. D. and Schilling, K. E.: A simple approach to distinguish land-use and climate-change effects on watershed hydrology, J. Hydrol., 376, 24–33, 2009.
Trambauer, P., Dutra, E., Maskey, S., Werner, M., Pappenberger, F., van Beek, L. P. H., and Uhlenbrook, S.: Comparison of different evaporation estimates over the African continent, Hydrol. Earth Syst. Sci., 18, 193–212, https://doi.org/10.5194/hess-18-193-2014, 2014.
UNEP: World atlas of desertification 2ED, United Nations Environment Programme, London, 1997.
Van Kirk, R. W. and Naman, S. W.: Relative Effects of Climate and Water Use on Base-Flow Trends in the Lower Klamath Basin1, J. Am. Water Resour. As. (JAWRA), 44, 1035–1052, 2008.
Van Steeter, M. M. and Pitlick, J.: Geomorphology and endangered fish habitats of the upper Colorado River: 1. Historic changes in streamflow, sediment load, and channel morphology, Water Resour. Res., 34, 287–302, 1998.
Velpuri, N. M., Senay, G. B., and Asante, K. O.: A multi-source satellite data approach for modelling Lake Turkana water level: calibration and validation using satellite altimetry data, Hydrol. Earth Syst. Sci., 16, 1–18, https://doi.org/10.5194/hess-16-1-2012, 2012.
Viglione, A., Laio, F., and Claps, P.: A comparison of homogeneity tests for regional frequency analysis, Water Resour. Res., 43, W03428, https://doi.org/10.1029/2006WR005095, 2007.
Wolski, P., Murray-Hudson, M., Savenije, H., and Gumbricht, T.: Modelling of the hydrology of the Okavango Delta Harry Oppenheimer Okavango Research Centre University of Botswana, MaunEU funded project ICA-4-CT-2001-10040, 2005.
Wooldridge, S., Kalma, J., and Kuczera, G.: Parameterization of a simple semi-distributed model for assessing the impact of landuse on hydrology response, J. Hydrology, 254, 16–32, 2001.
World Bank: GEF project on the Lake Chad Experience and Lessons Learned brief, World Bank, Washington D.C., 2006.
Yang, D., Shao, W., Yeh, P. J. F., Yang, H., Kanae, S., and Oki, T.: Impact of vegetation coverage on regional water balance in the nonhumid regions of China, Water Resour. Res., 45, W00A14, https://doi.org/10.1029/2008WR006948, 2009.
Yang, Z., Zhou, Y., Wenninger, J., and Uhlenbrook, S.: The causes of flow regime shifts in the semi-arid Hailiutu River, Northwest China, Hydrol. Earth Syst. Sci., 16, 87–103, https://doi.org/10.5194/hess-16-87-2012, 2012.
Yuretich, R. F. and Cerling, T. E.: Hydrogeochemistry of Lake Turkana, Kenya: mass balance and mineral reactions in an alkaline lake, Geochim. Cosmochim. Ac., 47, 1099–1109, 1983.
Zhang, L., Dawes, W. R., and Walker, G. R.: Response of mean annual evapotranspiration to vegetation changes at catchment scale, Water Resour. Res., 37, 701–708, 2001.