Author(s): Svenja Peterseim; Andreas Schlenkhoff; Sebastian Czickus
Linked Author(s): Andreas Schlenkhoff
Keywords: Shallow water flow; Supercritical flow; Urban flooding; Flash floods
Abstract: In order to develop a working risk management for flash floods caused by heavy rainfall events it is necessary to know the local distribution of the surface water. By means of twodimensional numerical simulations, you can obtain information on the local values of the flow velocity and on the water depth in flooded areas. Available software to calculate the necessary parameters originally target other applications like river floods and inundations. Water depths resulting from flash floods in steep urban areas can be very small compared to those resulting from inundations or river floods. So further investigations are necessary to find out if these dimensions can be calculated correctly using simulation programs based on shallow water equations. Therefore, numerical simulation results are compared to water depths from physical simulations. A physical model (tilting flume) is used to investigate different slopes up to 1: 10with varying discharges and roughnesses. Finally, the physical model will serve to validate the numerical model in order to investigate supercritical flows with small water depths.
Year: 2014