Articles | Volume 22, issue 8
Technical note 13 Aug 2018
Technical note | 13 Aug 2018
Technical note: GUARD – an automated fluid sampler preventing sample alteration by contamination, evaporation and gas exchange, suitable for remote areas and harsh conditions
Arno Hartmann et al.
No articles found.
Tobias Kluge, Tatjana S. Münster, Norbert Frank, Elisabeth Eiche, Regina Mertz-Kraus, Denis Scholz, Martin Finné, and Ingmar Unkel
Clim. Past Discuss.,
Revised manuscript not acceptedShort summary
A stalagmite from Hermes Cave (Greece) provides new insights into the climate evolution from 5.3−0.8 ka. Its close proximity to Mycenae and Corinth allows for a future comparative assessment of societal changes in a climatic context. Proxy data suggest significant centennial scale climate variability (i.e., wet vs. dry) with a long-term trend towards drier conditions from ca 3.7 to ~ 2.0 ka. The largest proxy variation of the whole record is found around the 4.2 ka event.
Gina E. Moseley, Christoph Spötl, Susanne Brandstätter, Tobias Erhardt, Marc Luetscher, and R. Lawrence Edwards
Clim. Past, 16, 29–50,Short summary
Abrupt climate change during the last ice age can be used to provide important insights into the timescales on which the climate is capable of changing and the mechanisms that drive those changes. In this study, we construct climate records for the period 60 to 120 ka using stalagmites that formed in caves along the northern rim of the European Alps and find good agreement with the timing of climate changes in Greenland and the Asian monsoon.
Mike Rogerson, Yuri Dublyansky, Dirk L. Hoffmann, Marc Luetscher, Paul Töchterle, and Christoph Spötl
Clim. Past, 15, 1757–1769,Short summary
Rainfall in North Africa is known to vary through time and is likely to change as global climate warms. Here, we provide a new level of understanding about past rainfall in North Africa by looking at a stalagmite which formed within northeastern Libya between 67 and 30 thousand years ago. We find that at times more rain falls, and the associated moisture is mostly derived from the western Mediterranean during winter storms. Sometimes, water comes from the eastern Mediterranean.
Till Oehler, Elisabeth Eiche, Doni Putra, Dini Adyasari, Hanna Hennig, Ulf Mallast, and Nils Moosdorf
Hydrol. Earth Syst. Sci. Discuss.,
Revised manuscript not acceptedShort summary
In the tropical karstic region of Gunung Kidul (southern Java, Indonesia) we observed high nutrient fluxes via groundwater discharge into the adjacent Indian Ocean during heavy rain events, which followed drier periods. Untreated sewage and fertilizers may contribute to high nutrient concentrations in groundwater. Identifying the timing of the groundwater nutrient fluxes is relevant for coastal groundwater management and may explain the sudden occurrence of harmful algae blooms in such settings.
M. Luetscher, M. Borreguero, G. E. Moseley, C. Spötl, and R. L. Edwards
The Cryosphere, 7, 1073–1081,
Related subject area
Subject: Catchment hydrology | Techniques and Approaches: Instruments and observation techniquesHydrologic regimes drive nitrate export behavior in human-impacted watershedsIntensive landscape-scale remediation improves water quality of an alluvial gully located in a Great Barrier Reef catchmentEnvironmental DNA simultaneously informs hydrological and biodiversity characterization of an Alpine catchmentTechnical note: Evaluation of a low-cost evaporation protection method for portable water samplersNew flood frequency estimates for the largest river in Norway based on the combination of short and long time seriesThe pulse of a montane ecosystem: coupling between daily cycles in solar flux, snowmelt, transpiration, groundwater, and streamflow at Sagehen Creek and Independence Creek, Sierra Nevada, USATechnical note: A time-integrated sediment trap to sample diatoms for hydrological tracingOn the value of high density rain gauge observations for small Alpine headwater catchment hydrologyDo stream water solute concentrations reflect when connectivity occurs in a small, pre-Alpine headwater catchment?Soil moisture sensor network design for hydrological applicationsCatchment-scale drought: capturing the whole drought cycle using multiple indicatorsField-based estimation and modelling of distributed groundwater recharge in a Mediterranean karst catchment, Wadi Natuf, West BankSurface water as a cause of land degradation from dryland salinityTechnical note: A microcontroller-based automatic rain sampler for stable isotope studiesControls on spatial and temporal variability in streamflow and hydrochemistry in a glacierized catchmentOpen-source Arduino-compatible data loggers designed for field researchWater-use dynamics of an alien-invaded riparian forest within the summer rainfall zone of South AfricaTechnical note: Mapping surface-saturation dynamics with thermal infrared imageryValue of uncertain streamflow observations for hydrological modellingWhy has catchment evaporation increased in the past 40 years? A data-based study in AustriaHydrological processes and permafrost regulate magnitude, source and chemical characteristics of dissolved organic carbon export in a peatland catchment of northeastern ChinaExploring the influence of citizen involvement on the assimilation of crowdsourced observations: a modelling study based on the 2013 flood event in the Bacchiglione catchment (Italy)Comment on “Can assimilation of crowdsourced data in hydrological modelling improve flood prediction?” by Mazzoleni et al. (2017)Multiconfiguration electromagnetic induction survey for paleochannel internal structure imaging: a case study in the alluvial plain of the River Seine, FranceTree-, stand- and site-specific controls on landscape-scale patterns of transpirationThe potamochemical symphony: new progress in the high-frequency acquisition of stream chemical dataImpact of snow deposition on major and trace element concentrations and elementary fluxes in surface waters of the Western Siberian Lowland across a 1700 km latitudinal gradientHuman amplified changes in precipitation–runoff patterns in large river basins of the Midwestern United StatesLandscape and groundwater controls over boreal lake water chemistry and water balance heterogeneity in an esker complex of northeastern Ontario, CanadaLandscape-scale water balance monitoring with an iGrav superconducting gravimeter in a field enclosureA site-level comparison of lysimeter and eddy covariance flux measurements of evapotranspirationA lab in the field: high-frequency analysis of water quality and stable isotopes in stream water and precipitationHigh-magnitude flooding across Britain since AD 1750Water yield following forest–grass–forest transitionsExploring water cycle dynamics by sampling multiple stable water isotope pools in a developed landscape in GermanyVariations of deep soil moisture under different vegetation types and influencing factors in a watershed of the Loess Plateau, ChinaContradictory hydrological impacts of afforestation in the humid tropics evidenced by long-term field monitoring and simulation modellingUse of cosmic-ray neutron sensors for soil moisture monitoring in forestsClosing the water balance with cosmic-ray soil moisture measurements and assessing their relation to evapotranspiration in two semiarid watershedsThe Hydrological Open Air Laboratory (HOAL) in Petzenkirchen: a hypothesis-driven observatoryTime series of tritium, stable isotopes and chloride reveal short-term variations in groundwater contribution to a streamUnderstanding runoff processes in a semi-arid environment through isotope and hydrochemical hydrograph separationsTransit times from rainfall to baseflow in headwater catchments estimated using tritium: the Ovens River, AustraliaQualitative soil moisture assessment in semi-arid Africa – the role of experience and training on inter-rater reliabilityDetecting groundwater discharge dynamics from point-to-catchment scale in a lowland stream: combining hydraulic and tracer methodsCharacteristics and controls of variability in soil moisture and groundwater in a headwater catchmentGroundwater surface mapping informs sources of catchment baseflowSpatial distribution of oxygen-18 and deuterium in stream waters across the Japanese archipelagoDocumentary evidence of historical floods and extreme rainfall events in Sweden 1400–1800Sediment flow paths and associated organic carbon dynamics across a Mediterranean catchment
Galen Gorski and Margaret A. Zimmer
Hydrol. Earth Syst. Sci., 25, 1333–1345,Short summary
Understanding when, where, and how nitrate is exported from watersheds is the key to addressing the challenges that excess nutrients pose. We analyzed daily nitrate and streamflow data for five nested, agricultural watersheds that export high levels of nitrate over a 4-year time period. Nutrient export patterns varied seasonally during baseflow but were stationary during stormflow. Additionally, anthropogenic and geologic factors drove nutrient export during both baseflow and stormflow.
Nicholas J. C. Doriean, William W. Bennett, John R. Spencer, Alexandra Garzon-Garcia, Joanne M. Burton, Peter R. Teasdale, David T. Welsh, and Andrew P. Brooks
Hydrol. Earth Syst. Sci., 25, 867–883,Short summary
Gully erosion is a major contributor to suspended sediment and associated nutrient pollution (e.g. gullies generate approximately 40 % of the sediment pollution impacting the Great Barrier Reef). This study used a new method of monitoring to demonstrate how large-scale earthworks used to remediated large gullies (i.e. eroding landforms > 1 ha) can drastically improve the water quality of connected waterways and, thus, protect vulnerable ecosystems in downstream-receiving waters.
Elvira Mächler, Anham Salyani, Jean-Claude Walser, Annegret Larsen, Bettina Schaefli, Florian Altermatt, and Natalie Ceperley
Hydrol. Earth Syst. Sci., 25, 735–753,Short summary
In this study, we collected water from an Alpine catchment in Switzerland and compared the genetic information of eukaryotic organisms conveyed by eDNA with the hydrologic information conveyed by naturally occurring hydrologic tracers. At the intersection of two disciplines, our study provides complementary knowledge gains and identifies the next steps to be addressed for using eDNA to achieve complementary insights into Alpine water sources.
Jana von Freyberg, Julia L. A. Knapp, Andrea Rücker, Bjørn Studer, and James W. Kirchner
Hydrol. Earth Syst. Sci., 24, 5821–5834,Short summary
Automated water samplers are often used to collect precipitation and streamwater samples for subsequent isotope analysis, but the isotopic signal of these samples may be altered due to evaporative fractionation occurring during the storage inside the autosamplers in the field. In this article we present and evaluate a cost-efficient modification to the Teledyne ISCO automated water sampler that prevents isotopic enrichment through evaporative fractionation of the water samples.
Kolbjørn Engeland, Anna Aano, Ida Steffensen, Eivind Støren, and Øyvind Paasche
Hydrol. Earth Syst. Sci., 24, 5595–5619,Short summary
We combine systematic, historical, and paleo information to obtain flood information from the last 10 300 years for the Glomma River in Norway. We identify periods with increased flood activity (4000–2000 years ago and the recent 1000 years) that correspond broadly to periods with low summer temperatures and glacier growth. The design floods in Glomma were more than 20 % higher during the 18th century than today. We suggest that trends in flood variability are linked to snow in late spring.
James W. Kirchner, Sarah E. Godsey, Madeline Solomon, Randall Osterhuber, Joseph R. McConnell, and Daniele Penna
Hydrol. Earth Syst. Sci., 24, 5095–5123,Short summary
Streams and groundwaters often show daily cycles in response to snowmelt and evapotranspiration. These typically have a roughly 6 h time lag, which is often interpreted as a travel-time lag. Here we show that it is instead primarily a phase lag that arises because aquifers integrate their inputs over time. We further show how these cycles shift seasonally, mirroring the springtime retreat of snow cover to higher elevations and the seasonal advance and retreat of photosynthetic activity.
Jasper Foets, Carlos E. Wetzel, Núria Martínez-Carreras, Adriaan J. Teuling, Jean-François Iffly, and Laurent Pfister
Hydrol. Earth Syst. Sci., 24, 4709–4725,Short summary
Diatoms (microscopic algae) are regarded as useful tracers in catchment hydrology. However, diatom analysis is labour-intensive; therefore, only a limited number of samples can be analysed. To reduce this number, we explored the potential for a time-integrated mass-flux sampler to provide a representative sample of the diatom assemblage for a whole storm run-off event. Our results indicate that the Phillips sampler did indeed sample representative communities during two of the three events.
Anthony Michelon, Lionel Benoit, Harsh Beria, Natalie Ceperley, and Bettina Schaefli
Hydrol. Earth Syst. Sci. Discuss.,
Revised manuscript accepted for HESSShort summary
Rainfall observation remains a challenge particularly in mountain environments. Unlike most studies which are model based, this analysis of the rainfall-runoff response of a 13.4 km2 alpine catchment is purely data-based and rely on measures from a network of 12 low-cost raingauges over 3 months. It assesses the importance of high-density rainfall observations to inform hydrological processes and help to design a permanent raingauge network.
Leonie Kiewiet, Ilja van Meerveld, Manfred Stähli, and Jan Seibert
Hydrol. Earth Syst. Sci., 24, 3381–3398,Short summary
The sources of stream water are important, for instance, for predicting floods. The connectivity between streams and different (ground-)water sources can change during rain events, which affects the stream water composition. We investigated this for stream water sampled during four events and found that stream water came from different sources. The stream water composition changed gradually, and we showed that changes in solute concentrations could be partly linked to changes in connectivity.
Lu Zhuo, Qiang Dai, Binru Zhao, and Dawei Han
Hydrol. Earth Syst. Sci., 24, 2577–2591,Short summary
Soil moisture plays an important role in hydrological modelling. However, most existing in situ observation networks rarely provide sufficient coverage to capture soil moisture variations. Clearly, there is a need to develop a systematic approach, so that with the minimal number of sensors the soil moisture information could be captured accurately. In this study, a simple and low-data requirement method is proposed (WRF, PCA, CA), which can provide very efficient soil moisture estimations.
Abraham J. Gibson, Danielle C. Verdon-Kidd, Greg R. Hancock, and Garry Willgoose
Hydrol. Earth Syst. Sci., 24, 1985–2002,Short summary
To be better prepared for drought, we need to be able to characterize how they begin, translate to on-ground impacts and how they end. We created a 100-year drought record for an area on the east coast of Australia and compared this with soil moisture and vegetation data. Drought reduces vegetation and soil moisture, but recovery rates are different across different catchments. Our methods can be universally applied and show the need to develop area-specific data to inform drought management.
Clemens Messerschmid, Martin Sauter, and Jens Lange
Hydrol. Earth Syst. Sci., 24, 887–917,Short summary
Recharge assessment in the shared transboundary Western Aquifer Basin is highly relevant, scientifically as well as hydropolitically (in Israeli–Palestinian water negotiations). Our unique combination of field-measured soil characteristics and soil moisture time series with soil moisture saturation excess modelling provides a new basis for the spatial differentiation of formation-specific groundwater recharge (at any scale), applicable also in other previously ungauged basins around the world.
J. Nikolaus Callow, Matthew R. Hipsey, and Ryan I. J. Vogwill
Hydrol. Earth Syst. Sci., 24, 717–734,Short summary
Secondary dryland salinity is a global land degradation issue. Our understanding of causal processes is adapted from wet and hydrologically connected landscapes and concludes that low end-of-catchment runoff indicates land clearing alters water balance in favour of increased infiltration and rising groundwater that bring salts to the surface causing salinity. This study shows surface flows play an important role in causing valley floor recharge and dryland salinity in low-gradient landscapes.
Nils Michelsen, Gerrit Laube, Jan Friesen, Stephan M. Weise, Ali Bakhit Ali Bait Said, and Thomas Müller
Hydrol. Earth Syst. Sci., 23, 2637–2645,Short summary
Most commercial automatic rain samplers are costly and do not prevent evaporation from the collection bottles. Hence, we have developed a microcontroller-based collector enabling timer-actuated integral rain sampling. The simple, low-cost device is robust and effectively minimizes post-sampling evaporation. The excellent performance of the collector during an evaporation experiment in a lab oven suggests that even multi-week field deployments in warm climates are feasible.
Michael Engel, Daniele Penna, Giacomo Bertoldi, Gianluca Vignoli, Werner Tirler, and Francesco Comiti
Hydrol. Earth Syst. Sci., 23, 2041–2063,Short summary
Hydrometric and geochemical dynamics are controlled by interplay of meteorological conditions, topography and geological heterogeneity. Nivo-meteorological indicators (such as global solar radiation, temperature and decreasing snow depth) explain monthly conductivity and isotopic dynamics best. These insights are important for better understanding hydrochemical responses of glacierized catchments under a changing cryosphere.
Andrew D. Wickert, Chad T. Sandell, Bobby Schulz, and Gene-Hua Crystal Ng
Hydrol. Earth Syst. Sci., 23, 2065–2076,Short summary
Measuring Earth's changing environment is a critical part of natural science, but to date most of the equipment to do so is expensive, proprietary, and difficult to customize. We addressed this challenge by developing and deploying the ALog, a low-power, lightweight, Arduino-compatible data logger. We present our hardware schematics and layouts, as well as our customizable code library that operates the ALog and helps users to link it to off-the-shelf sensors.
Bruce C. Scott-Shaw and Colin S. Everson
Hydrol. Earth Syst. Sci., 23, 1553–1565,Short summary
The research undertaken for this study has allowed for an accurate direct comparison of indigenous and introduced tree water use. The measurements of trees growing in the understorey indicate significant water use in the subcanopy layer. The results showed that individual tree water use is largely inter-species specific. The introduced species remain active during the dry winter periods, resulting in their cumulative water use being significantly greater than that of the indigenous species.
Barbara Glaser, Marta Antonelli, Marco Chini, Laurent Pfister, and Julian Klaus
Hydrol. Earth Syst. Sci., 22, 5987–6003,Short summary
We demonstrate how thermal infrared images can be used for mapping the appearance and disappearance of water at the surface. The use of thermal infrared images allows for mapping this appearance and disappearance for various temporal and spatial resolutions, and the images can be understood intuitively. We explain the necessary steps in detail, from image acquisition to final processing, by relying on image examples and experience from an 18-month mapping campaign.
Simon Etter, Barbara Strobl, Jan Seibert, and H. J. Ilja van Meerveld
Hydrol. Earth Syst. Sci., 22, 5243–5257,Short summary
To evaluate the potential value of streamflow estimates for hydrological model calibration, we created synthetic streamflow datasets in various temporal resolutions based on the errors in streamflow estimates of 136 citizens. Our results show that streamflow estimates of untrained citizens are too inaccurate to be useful for model calibration. If, however, the errors can be reduced by training or filtering, the estimates become useful if also a sufficient number of estimates are available.
Doris Duethmann and Günter Blöschl
Hydrol. Earth Syst. Sci., 22, 5143–5158,Short summary
We analyze changes in catchment evaporation estimated from the water balances of 156 catchments in Austria over 1977–2014, as well as the possible causes of these changes. Our results show that catchment evaporation increased on average by 29 ± 14 mm yr−1 decade−1. We attribute this increase to changes in atmospheric demand (based on reference and pan evaporation), changes in vegetation (quantified by a satellite-based vegetation index), and changes in precipitation.
Yuedong Guo, Changchun Song, Wenwen Tan, Xianwei Wang, and Yongzheng Lu
Hydrol. Earth Syst. Sci., 22, 1081–1093,Short summary
The study examined dynamics of DOC export from a permafrost peatland catchment located in northeastern China. The findings indicated that the DOC export is a transport-limited process and the DOC load was significant for the net carbon balance in the studied catchment. The flowpath shift process is key to observed DOC concentration, resources and chemical characteristics in discharge. Permafrost degradation would likely elevate the proportion of microbe-originated DOC in baseflow.
Maurizio Mazzoleni, Vivian Juliette Cortes Arevalo, Uta Wehn, Leonardo Alfonso, Daniele Norbiato, Martina Monego, Michele Ferri, and Dimitri P. Solomatine
Hydrol. Earth Syst. Sci., 22, 391–416,Short summary
We investigate the usefulness of assimilating crowdsourced observations from a heterogeneous network of sensors for different scenarios of citizen involvement levels during the flood event occurred in the Bacchiglione catchment in May 2013. We achieve high model performance by integrating crowdsourced data, in particular from citizens motivated by their feeling of belonging to a community. Satisfactory model performance can still be obtained even for decreasing citizen involvement over time.
Daniele P. Viero
Hydrol. Earth Syst. Sci., 22, 171–177,
Fayçal Rejiba, Cyril Schamper, Antoine Chevalier, Benoit Deleplancque, Gaghik Hovhannissian, Julien Thiesson, and Pierre Weill
Hydrol. Earth Syst. Sci., 22, 159–170,Short summary
The internal variability of paleomeanders strongly influence water fluxes in alluvial plains. This study presents the results of a hydrogeophysical investigation that provide a very detailed characterization of the geometry of a wide paleomeander. The presented case study, situated in the Seine River basin (France), represents a common sedimentary and geomorphological structure in alluvial plains worldwide.
Sibylle Kathrin Hassler, Markus Weiler, and Theresa Blume
Hydrol. Earth Syst. Sci., 22, 13–30,Short summary
We use sap velocity measurements from 61 trees on 132 days to gain knowledge about the controls of landscape-scale transpiration, distinguishing tree-, stand- and site-specific controls on sap velocity and sap flow patterns and examining their dynamics during the vegetation period. Our results show that these patterns are not exclusively determined by tree characteristics. Thus, including site characteristics such as geology and aspect could be beneficial for modelling or management purposes.
Paul Floury, Jérôme Gaillardet, Eric Gayer, Julien Bouchez, Gaëlle Tallec, Patrick Ansart, Frédéric Koch, Caroline Gorge, Arnaud Blanchouin, and Jean-Louis Roubaty
Hydrol. Earth Syst. Sci., 21, 6153–6165,Short summary
We present a new prototype
lab in the fieldnamed River Lab (RL) designed for water quality monitoring to perform a complete analysis at sub-hourly frequency of major dissolved species in river water. The article is an analytical paper to present the proof of concept, its performances and improvements. Our tests reveal a significant improvement of reproducibility compared to conventional analysis in the laboratory. First results are promising for understanding the critical zone.
Vladimir P. Shevchenko, Oleg S. Pokrovsky, Sergey N. Vorobyev, Ivan V. Krickov, Rinat M. Manasypov, Nadezhda V. Politova, Sergey G. Kopysov, Olga M. Dara, Yves Auda, Liudmila S. Shirokova, Larisa G. Kolesnichenko, Valery A. Zemtsov, and Sergey N. Kirpotin
Hydrol. Earth Syst. Sci., 21, 5725–5746,Short summary
We used a coupled hydrological–hydrochemical approach to assess the impact of snow on river and lake water chemistry across a permafrost gradient in very poorly studied Western Siberia Lowland (WSL), encompassing > 1.5 million km2. The riverine springtime fluxes of major and trace element in WSL rivers might be strongly overestimated due to previously unknown input from the snow deposition.
Sara A. Kelly, Zeinab Takbiri, Patrick Belmont, and Efi Foufoula-Georgiou
Hydrol. Earth Syst. Sci., 21, 5065–5088,Short summary
Humans have profoundly altered land cover and soil drainage for agricultural purposes in the Midwestern USA. Here we investigate whether climate alone can explain recent increases in observed streamflows throughout the region. Using multiple analyses, including statistical tests and water budgets, we conclude that historical drainage installation has likely amplified the streamflow response to regional precipitation increases. We stress that better documentation of artificial drainage is needed.
Maxime P. Boreux, Scott F. Lamoureux, and Brian F. Cumming
Hydrol. Earth Syst. Sci. Discuss.,
Revised manuscript accepted for HESSShort summary
The investigation of groundwater-lake water interactions in a highly permeable boreal terrain using several indicators showed that lowland lakes are imbedded into the groundwater system and are thus relatively resilient to short-term hydroclimatic change while upland lakes rely more on precipitation as their main water input, making them more sensitive to evaporative drawdown. This suggest that landscape position controls the vulnerability of lake water levels to hydroclimatic change.
Andreas Güntner, Marvin Reich, Michal Mikolaj, Benjamin Creutzfeldt, Stephan Schroeder, and Hartmut Wziontek
Hydrol. Earth Syst. Sci., 21, 3167–3182,Short summary
Monitoring water storage changes beyond the point scale is a challenge. Here, we show that an integrative and non-invasive way is by observing variations of gravity that are induced by water mass changes. A high-precision superconducting gravimeter is successfully operated in the field and allows for direct and continuous monitoring of the water balance and of its components, such as actual evapotranspiration.
Martin Hirschi, Dominik Michel, Irene Lehner, and Sonia I. Seneviratne
Hydrol. Earth Syst. Sci., 21, 1809–1825,Short summary
We compare lysimeter and eddy covariance (EC) flux measurements of evapotranspiration at a research catchment in Switzerland. The measurements are compared on various timescales, and with respect to a 40-year long-term lysimeter time series. Overall, the lysimeter and EC measurements agree well, especially on the annual timescale. Furthermore, we identify that lack of reliable EC data during/after rainfall events significantly contributes to an underestimation of EC evapotranspiration.
Jana von Freyberg, Bjørn Studer, and James W. Kirchner
Hydrol. Earth Syst. Sci., 21, 1721–1739,Short summary
We present a newly developed instrument package that enables the online analysis of stable water isotopes and major ion chemistry at 30 min intervals in the field. The resulting data streams provide an unprecedented view of hydrochemical dynamics on the catchment scale. Based on a detailed analysis of the variable behavior of isotopic and chemical tracers in stream water and precipitation over a 4-week period, we developed a conceptual hypothesis for runoff generation in the studied catchment.
Neil Macdonald and Heather Sangster
Hydrol. Earth Syst. Sci., 21, 1631–1650,Short summary
We use historical records to extend current understanding of flood risk, examining past spatial and temporal variability and ask
are the perceived high-magnitude flood events witnessed in recent years really unprecedented?We identify that there are statistically significant relationships between the British flood index and climatic drivers, whereby the largest floods often transcend single catchments affecting regions and that the current flood-rich period is not unprecedented.
Katherine J. Elliott, Peter V. Caldwell, Steven T. Brantley, Chelcy F. Miniat, James M. Vose, and Wayne T. Swank
Hydrol. Earth Syst. Sci., 21, 981–997,Short summary
Our long-term results are relevant to land areas that are in pasture and those that have reverted back to forests. We found that within a deciduous forest, species identity matters in terms of how much precipitation leaves the watershed as evapotranspiration versus water yield. We demonstrate that a shift in tree species composition from species with ring-porous xylem to species with diffuse-porous xylem can increase water use, and in turn, produce a long-term reduction in water yield.
Natalie Orlowski, Philipp Kraft, Jakob Pferdmenges, and Lutz Breuer
Hydrol. Earth Syst. Sci., 20, 3873–3894,Short summary
The 2-year measurements of δ2H and δ18O in rainfall, stream, soil, and groundwater revealed that surface and groundwater are isotopically disconnected from the annual precipitation cycle but showed bidirectional interactions in the Schwingbach catchment. We established a hydrological model to estimate spatially distributed groundwater ages and flow directions. Our model revealed complex age dynamics and showed that runoff must have been stored in the catchment for much longer than event water.
Xuening Fang, Wenwu Zhao, Lixin Wang, Qiang Feng, Jingyi Ding, Yuanxin Liu, and Xiao Zhang
Hydrol. Earth Syst. Sci., 20, 3309–3323,Short summary
In this study, we focused on analyzing the variation and factors influencing deep soil moisture content based on a soil moisture survey of the Ansai watershed. Our results revealed the variation characteristics of deep soil moisture and its controlling mechanism at a moderate scale. The results of this study are of practical significance for vegetation restoration strategies and the sustainability of restored ecosystems.
Guillaume Lacombe, Olivier Ribolzi, Anneke de Rouw, Alain Pierret, Keoudone Latsachak, Norbert Silvera, Rinh Pham Dinh, Didier Orange, Jean-Louis Janeau, Bounsamai Soulileuth, Henri Robain, Adrien Taccoen, Phouthamaly Sengphaathith, Emmanuel Mouche, Oloth Sengtaheuanghoung, Toan Tran Duc, and Christian Valentin
Hydrol. Earth Syst. Sci., 20, 2691–2704,Short summary
Laos and Vietnam have switched from net forest loss to net forest expansion between 1990 and 2015. Based on long-term field measurements of land use, river flows, and weather data, we demonstrate that forest expansion can have extreme, yet opposite, impacts on water resources, depending on how the newly established tree-based cover is managed. The conversion of annual crops to teak plantations in Laos or to naturally regrowing forests in Vietnam led to increased and decreased flows, respectively.
Ingo Heidbüchel, Andreas Güntner, and Theresa Blume
Hydrol. Earth Syst. Sci., 20, 1269–1288,Short summary
Cosmic-ray neutron sensors bridge the gap between point-scale measurements of soil moisture and remote sensing applications. We tested four distinct methods to calibrate the sensor in a temperate forest environment using different soil moisture weighting approaches. While the variable leaf biomass of the deciduous trees had no significant influence on the calibration, it proved necessary to modify the standard calibration method to achieve the best sensor performance.
A. P. Schreiner-McGraw, E. R. Vivoni, G. Mascaro, and T. E. Franz
Hydrol. Earth Syst. Sci., 20, 329–345,Short summary
Soil moisture estimates from a novel method were evaluated in two semiarid watersheds. We found good agreements between the technique and estimates derived from watershed instruments designed to close the water balance. We then investigated local hydrologic processes and link between evapotranspiration and soil moisture obtained from the novel measurements.
G. Blöschl, A. P. Blaschke, M. Broer, C. Bucher, G. Carr, X. Chen, A. Eder, M. Exner-Kittridge, A. Farnleitner, A. Flores-Orozco, P. Haas, P. Hogan, A. Kazemi Amiri, M. Oismüller, J. Parajka, R. Silasari, P. Stadler, P. Strauss, M. Vreugdenhil, W. Wagner, and M. Zessner
Hydrol. Earth Syst. Sci., 20, 227–255,Short summary
This paper illustrates the experimental and monitoring set-up of the 66 ha Hydrological Open Air Laboratory (HOAL) in Petzenkirchen, Lower Austria, which allows meaningful hypothesis testing. The HOAL catchment features a range of different runoff generation processes (surface runoff, springs, tile drains, wetlands), and is convenient from a logistic point of view as all instruments can be connected to the power grid and a high-speed glassfibre local area network.
C. Duvert, M. K. Stewart, D. I. Cendón, and M. Raiber
Hydrol. Earth Syst. Sci., 20, 257–277,Short summary
The transit time of water is a key indicator of hydrological processes at the catchment scale. Our results suggest that the use of tritium time series in streamwater can be highly valuable for assessing the temporal variations in the transit time of older groundwater contributions to streamflow. We also show that, shortly after high flow events, the transit time of the old water fraction increases and tends to approach the groundwater residence time.
V. V. Camacho Suarez, A. M. L. Saraiva Okello, J. W. Wenninger, and S. Uhlenbrook
Hydrol. Earth Syst. Sci., 19, 4183–4199,Short summary
Isotope and hydrochemical tracers are tested providing new insights to isotope hydrograph in semi-arid areas in southern Africa. This study provides a spatial hydrochemical characterization of surface and groundwater sources, end member mixing analysis, and two- and three-component hydrograph separations. Results showed that the Kaap catchment is mainly dominated by groundwater sources, and direct runoff is positively correlated with the Antecedent Precipitation Index during the wet season.
I. Cartwright and U. Morgenstern
Hydrol. Earth Syst. Sci., 19, 3771–3785,Short summary
This study documents the age of water that contributes to rivers in upper catchments using the radioactive tracer tritium. River water in the upper Ovens Valley (Australia) is several years to decades old and water from different parts of the catchment (e.g., soil, regolith, and groundwater) is mobilised at different flow conditions. The results indicate that these rivers are buffered against short term climate variability but are susceptible to longer-term climate and land use changes
M. Rinderer, H. C. Komakech, D. Müller, G. L. B. Wiesenberg, and J. Seibert
Hydrol. Earth Syst. Sci., 19, 3505–3516,Short summary
A field method for assessing soil moisture in semi-arid conditions is proposed and tested in terms of inter-rater reliability with 40 Tanzanian farmers, students and experts. The seven wetness classes are based on qualitative indicators that one can see, feel or hear. It could be shown that the qualitative wetness classes reflect differences in volumetric water content and neither experience nor a certain level of education was a prerequisite to gain high agreement among raters.
J. R. Poulsen, E. Sebok, C. Duque, D. Tetzlaff, and P. K. Engesgaard
Hydrol. Earth Syst. Sci., 19, 1871–1886,
H. K. McMillan and M. S. Srinivasan
Hydrol. Earth Syst. Sci., 19, 1767–1786,Short summary
River flows depend not only on how much water is in a catchment, but also on where the water is stored, which changes over time. We monitored streamflow, soil moisture, and groundwater levels in a NZ catchment, to find out what controls water storage and variability. We found that the catchment had a summer mode where water storage is controlled by near-surface interactions of water with soils and vegetation, and a winter mode where water storage is controlled by deeper groundwater movement.
J. F. Costelloe, T. J. Peterson, K. Halbert, A. W. Western, and J. J. McDonnell
Hydrol. Earth Syst. Sci., 19, 1599–1613,Short summary
Groundwater surface mapping is used as an independent data set to better estimate groundwater discharge to streamflow. The groundwater surfaces indicated when other techniques likely overestimated the groundwater discharge component of baseflow. Groundwater surfaces also identified areas where regional groundwater could not be contributing to tributary streamflow. This method adds significant value to water resource management where sufficient groundwater monitoring data are available.
M. Katsuyama, T. Yoshioka, and E. Konohira
Hydrol. Earth Syst. Sci., 19, 1577–1588,
Hydrol. Earth Syst. Sci., 19, 1307–1323,
C. Boix-Fayos, E. Nadeu, J. M. Quiñonero, M. Martínez-Mena, M. Almagro, and J. de Vente
Hydrol. Earth Syst. Sci., 19, 1209–1223,Short summary
This study follows organic carbon from soils along sediment flow paths at catchment scale to analyse the evolution of OC pools. Selectivity of particles during detachment and transport, and protection of OC during transport and deposition are key for the concentration and quality of OC at depositional settings and for the terrestrial carbon sink. OC can also be increased by ecological processes and by replacement in eroded areas, converting catchments into relevant sinks for C budget.
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We have developed a new mobile automated water sampling device for environmental research and other applications where waters need to be tested for compliance with environmental/health regulations. It has two main advantages over similar devices: firstly, it injects water samples directly into airtight vials to prevent any change in sample properties through contamination, evaporation and gas exchange. Secondly, it can hold up to 160 sample vials, while other devices only hold up to 24 vials.
We have developed a new mobile automated water sampling device for environmental research and...