Journal cover Journal topic
Hydrology and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 5.153
IF5.153
IF 5-year value: 5.460
IF 5-year
5.460
CiteScore value: 7.8
CiteScore
7.8
SNIP value: 1.623
SNIP1.623
IPP value: 4.91
IPP4.91
SJR value: 2.092
SJR2.092
Scimago H <br class='widget-line-break'>index value: 123
Scimago H
index
123
h5-index value: 65
h5-index65
Preprints
https://doi.org/10.5194/hess-2020-453
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/hess-2020-453
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  29 Sep 2020

29 Sep 2020

Review status
This preprint is currently under review for the journal HESS.

Runoff sensitivity to spatial rainfall variability: A hydrological modeling study with dense rain gauge observations

Clara Hohmann1,2, Gottfried Kirchengast1,2,3, Sungmin O2,3,a, Wolfgang Rieger4, and Ulrich Foelsche3,1,2 Clara Hohmann et al.
  • 1Wegener Center for Climate and Global Change (WEGC), University of Graz, Graz, Austria
  • 2FWF-DK Climate Change, University of Graz, Graz, Austria
  • 3Institute for Geophysics, Astrophysics, and Meteorology/Institute of Physics, University of Graz, Graz, Austria
  • 4Bavarian Environment Agency, Germany
  • anow at: Biogeochemical Integration, Max Planck Institute for Biogeochemistry, Jena, Germany

Abstract. Precipitation is a key input to hydrological models. While rain gauges provide the most direct precipitation measurements, their accuracy in capturing rain patterns highly depends on the spatial variability of rainfall events and the gauge network density. In this study, we employ a high-resolution meteorological station network (mean station distance of 1.4 km), the WegenerNet in southeastern Austria, to investigate the impact of station density and interpolation schemes on runoff simulations. We first simulate runoff during heavy precipitation (three short-duration and three long-duration events) using a physically based hydrological model with precipitation input obtained from a full network of 158 stations. The same simulations are then repeated with precipitation inputs from subnetworks of 5, 8, 16, 32, and 64 stations, using three different interpolation schemes – Inverse Distance Weighting with a weighting power of 2 and of 3, respectively, and Thiessen polygon interpolation. We find that the performance of runoff simulations is greatly influenced by the spatial variability of precipitation input, especially for short-duration rainfall events and in small catchments. For long-duration events, reliable runoff simulations in the study area can be obtained with a subnetwork of 16 or more well-distributed gauges (mean station distance of about 6 km). We find a clear effect of interpolation schemes on runoff modeling as well, but only for low-density gauge networks. The sensitivity to the precipitation input is smaller for long-duration heavy precipitation events and bigger catchments. As a next step we suggest to study an ensemble of precipitation datasets in combination with runoff modeling to be able to decompose the effects of precipitation measurement uncertainties and its spatial variability.

Clara Hohmann et al.

Interactive discussion

Status: open (until 24 Nov 2020)
Status: open (until 24 Nov 2020)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
[Subscribe to comment alert] Printer-friendly Version - Printer-friendly version Supplement - Supplement

Clara Hohmann et al.

Data sets

WegenerNet climate station networkLevel 2 data version 7.1 2007-2018 J. Fuchsberger, G. Kirchengast, C. Bichler, A. Leuprecht, and T. Kabas https://doi.org/10.25364/WEGC/WPS7.1:2019.1

Clara Hohmann et al.

Viewed

Total article views: 418 (including HTML, PDF, and XML)
HTML PDF XML Total BibTeX EndNote
318 96 4 418 0 1
  • HTML: 318
  • PDF: 96
  • XML: 4
  • Total: 418
  • BibTeX: 0
  • EndNote: 1
Views and downloads (calculated since 29 Sep 2020)
Cumulative views and downloads (calculated since 29 Sep 2020)

Viewed (geographical distribution)

Total article views: 383 (including HTML, PDF, and XML) Thereof 380 with geography defined and 3 with unknown origin.
Country # Views %
  • 1
1
 
 
 
 

Cited

Saved

No saved metrics found.

Discussed

No discussed metrics found.
Latest update: 26 Oct 2020
Publications Copernicus
Download
Short summary
Heavy precipitation events are still feeding with a large uncertainty into hydrological models. Based on the highly dense station network WegenerNet (one station per 2 km2) we analyzed the sensitivity of runoff simulations to different rain network densities and interpolation methods in small catchments. We find, and quantify relevant characteristics, that runoff curves especially from short-duration convective rainfall events are strongly influenced by gauge station density and distribution.
Heavy precipitation events are still feeding with a large uncertainty into hydrological models....
Citation