Reinhardt-Imjela, C.; Maerker, K.; Schulte, A. & Kleber, A. (2018): <b>Implications of hydraulic anisotropy in periglacial cover beds for flood simulation in low mountain ranges (Ore Mountains, Germany)</b>. <i>DIE ERDE – Journal of the Geographical Society of Berlin</i> <b>149</b>(2-3), 86-101.
Resource Description
Title:
Implications of hydraulic anisotropy in periglacial cover beds for flood simulation in low mountain ranges (Ore Mountains, Germany)
FOR816dw ID:
17
Publication Date:
2018-01-01
License and Usage Rights:
Resource Owner(s):
Individual:
Christian Reinhardt-Imjela
Contact:
email:
christian.reinhardt-imjela <at> fu-berlin.de
Malteserstraße 74-100
12249 Berlin
Germany
Individual:
Katja Maerker
Contact:
email:
webmaster <at> lcrs.de
Individual:
Achim Schulte
Contact:
email:
webmaster <at> lcrs.de
Individual:
Arno Kleber
Contact:
email:
webmaster <at> lcrs.de
Abstract:
Abstract<br/>
The simulation of floods with conceptual rainfall-runoff models is a frequently used method for various ap -<br/>
plications in flood risk management. In mountain areas, the identification of the optimum model parameters<br/>
during the calibration is often difficult because of the complexity and variability of catchment properties and<br/>
hydrological processes. Central European mountain ranges are typically covered by Pleistocene periglacial<br/>
slope deposits. The hydraulic conductivity of the cover beds shows a high degree of anisotropy, so it is impor -<br/>
tant to understand the role of this effect in flood models of mesoscale mountain watersheds. Based on previ -<br/>
ous field work, the study analyses the sensitivity of the NASIM modeling system to a variation of vertical and<br/>
lateral hydraulic conductivity for the Upper Flöha watershed (Ore Mountains, Germany). Depending on the<br/>
objective function (Nash-Sutcliffe coefficient, peak discharge), two diametric parameter sets were identified<br/>
both resulting in a high goodness-of-fit for total discharge of the flood events, but only one reflects the hydro-<br/>
logical process knowledge. In a second step, the knowledge of the spatial distribution of the cover beds is used<br/>
to investigate the potential for a simplification of the model parameterisation. The soil types commonly used<br/>
for the spatial discretisation of rainfall-runoff models were aggregated to one main class (periglacial cover<br/>
beds only). With such a simplified model, the total flood discharge and the runoff components were simulated<br/>
with the same goodness of fit as with the original model. In general, the results point out that the anisotropy in<br/>
the unsaturated zone, which is intensified by periglacial cover beds, is an important element of flood models.<br/>
First, a parameter set corresponding to the hydraulic anisotropy in the cover beds is essential for the optimum<br/>
reproduction of the flood dynamics. Second, a discretisation of soil types is not necessarily required for flood<br/>
modeling in Central European mountain areas
Keywords:
| flood simulation |
Literature type specific fields:
ARTICLE
Journal:
DIE ERDE – Journal of the Geographical Society of Berlin
