Possibilities Of Hydraulic And Hydrology
Simulation Models As Support To Conventional
Methods For The Limit Of Hazard Zones By The
Example Of The Donnersbach Stream
Author(s)
S. Janu
Abstract
Numeric hydraulic simulation models are used successfully in the range of flood
documentation and event analysis. By using these documentations, with the help
of event data sets (precipitation, discharge data, water marks...), it is possible to
calibrate the provided models and to gain useful knowledge of the pros and cons
and their application. In addition to that, with laser scan data sets, wide land
models with a high resolution can be built and used as a basis for numerical
hydraulic simulations.
In the existing project, the revision of the hazard mapping Donnersbachwald
resulted in the use of a numeric hydraulic simulation as a supplement to the
common methods (historic method, literature-investigation, analysis of previous
planning and expert opinion).
For the project \“Delimitation of hazard zones at the torrent
Donnersbach/Styria” two-dimensional and one-dimensional hydraulic simulation
models were used in addition to the common planning methods (historical
method, literature search, evaluation of past planning and appraisals).
Different scenarios were calculated, varying the input hydrograph (the
hydrologic calculations were carried out with the aid of the HEC-HMS model),
flooding process and blockage of bridges. The selected sections lie in the valley
at the bottom of the community of Donnersbach with a slope angle of between
two and five percent.
After evaluation of existing data sets with the help of historical event data in
principle, two questions for the simulation resulted:
1. The effect of blockage of existing bridges for the overland flow.
2. Retardation of flow due to the storage effect of overland flow for the main
stream in Donnersbach.
With the two-dimensional numerical simulation the reciprocal effects of the
subordinated processes and different discharge scenarios could be considered
and analyzed. The results were used on one hand as a support instrument for the
delineation of hazard zones and on the other hand as documentation material for
the public work.
Keywords: flood discharge, numeric 2-d simulation, delineation of hazard zones.
Keywords
flood discharge, numeric 2-d simulation, delineation of hazard zones.
Related Book
Other papers in this volume
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