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Possibilities of the semi-distributed and distributed models in forest hydrology on example of the Ostravice basin

Author(s): Jan Unucka | Milan Jařabáč | Veronika Říhová | Jozef Richnavský | Michaela Hořínková | Ondřej Malek | Peter Bobáľ | Michal Podhorányi | Martin Ďuricha | Petr Vavroš | Boris Šír | Martin Adamec | Dušan Židek

Journal: Časopis Beskydy
ISSN 1803-2451

Volume: 3;
Issue: 2;
Start page: 205;
Date: 2010;
Original page

Keywords: Ostravice | forest hydrology | hydrologic modelling | HEC-HMS | HYDROG | MIKE SHE | SIMWE

The impact of forest on the rainfall-runoff conditions and erosion processes is of- ten discussed in both scientific papers and land planning issues. Long-term stud- ies of rainfall-runoff conditions and erosion processes in small forest catchments are a traditional approach to study of these landscape relations. But several aspects give a support to the usage of geographic information systems (GIS) and numerical hydrologic models -- rainfall-runoff, hydrodynamic and dynamic erosion models. Using this ensemble on larger areas beyond the spatial extent of a small forest wa- tershed is one of them. The possibility of long-term simulations and prediction of the future runoff and erosion conditions is the second main reason for using these analysis tools. Using capabilities of the GIS and numerical models is the approach demonstrated on the Ostravice basin and real hydrosynoptic situations. Several rainfall-runoff episodes were selected -- common regional rainfalls with low ante- cedent watershed saturation and convective flash rainfall with higher watershed saturation. The results, which were achieved by the utilization of various meth- ods of the hydrologic transformation in the watershed scale (Horton, Green-Ampt, SCS-CN) and semi-distributed (HYDROG, HEC-HMS) and distributed models (SIMWE, MIKE SHE) confi rm the influence of forest land cover on the rainfall- runoff relations. Final testing of the model results illustrates a good correspond- ence of the semi-distributed and distributed models.
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