Urban Flood Modeling – Impact of Digital elevation model (DEM)

Autor: Stapel C., Tränckner J., Kachholz F.
In:

Urban Water Planning and Technologies for sustainable management
10. International Conference
Autor: Bertrand-Krajewski, Jean-Luc (INSA Lyon France)
ISBN: ISBN 978-2-917199 - 09 -1
Seite: 351 - 351
Jahr: 2019

Einordung:
Institut: Professur Wasserwirtschaft

Abstract:
For flood risk management in the city of Rostock the flood prone areas due to sewer ponding had to be allocated, by using a semi-distributed modelcombination of 1D sewer modelling with 2D flood models. Flood model surface (bathymetry) was constructed as a rectangular single grid. The desired high model accuracy needs to be balanced with the effort of model preparation, simulation time and numeric stability. The Impact of DEM (Digital Elevation Model) as a decisive model input wasconsidered in different resolutions (5m and finer). Our investigations resulted, that to identify the flooding hotspots aDEM resolution of 5m is sufficient, whereby duration of simulations couldreduced significantly, compared with fine resolutions. For detailed investigation of identified hotspots theneeded high resolution of DEM is limited due to numerical conditions of shallow water wave propagation, so we did not use available original Datafrom Unmanned Area Vehicles(UAV) in resolution of 0.05m, but resampled it to a grid of 0.5mfor simulations. The coupling of models can be improved by impressing streets intobathymetry on the individual groundlevelof every node (terrestric measured manhole level) by using functionality of GIS.

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