 |
| Titel |
Quantifying sensitivity to droughts – an experimental modeling approach |
| VerfasserIn |
M. Staudinger, M. Weiler, J. Seibert |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 19, no. 3 ; Nr. 19, no. 3 (2015-03-12), S.1371-1384 |
| Datensatznummer |
250120658
|
| Publikation (Nr.) |
 copernicus.org/hess-19-1371-2015.pdf |
|
|
|
|
|
| Zusammenfassung |
| Meteorological droughts like those in summer 2003 or spring 2011 in Europe
are expected to become more frequent in the future. Although the spatial
extent of these drought events was large, not all regions were affected in
the same way. Many catchments reacted strongly to the meteorological droughts
showing low levels of streamflow and groundwater, while others hardly
reacted. Also, the extent of the hydrological drought for specific catchments
was different between these two historical events due to different initial
conditions and drought propagation processes. This leads to the important
question of how to detect and quantify the sensitivity of a catchment to
meteorological droughts. To assess this question we designed hydrological
model experiments using a conceptual rainfall-runoff model. Two drought
scenarios were constructed by selecting precipitation and temperature
observations based on certain criteria: one scenario was a modest but
constant progression of drying based on sorting the years of observations
according to annual precipitation amounts. The other scenario was a more
extreme progression of drying based on selecting months from different years,
forming a year with the wettest months through to a year with the driest
months. Both scenarios retained the observed intra-annual seasonality for the
region. We evaluated the sensitivity of 24 Swiss catchments to these
scenarios by analyzing the simulated discharge time series and modeled
storage. Mean catchment elevation, slope and area were the main controls on
the sensitivity of catchment discharge to precipitation. Generally,
catchments at higher elevation and with steeper slopes appeared less
sensitive to meteorological droughts than catchments at lower elevations with
less steep slopes. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|