Extension And Testing Of A 2D Hydrodynamic Model For Direct Rainfall Runoff Simulation


Autoria(s): Klar, Robert; Achleitner, Stefan; Lumassegger, Simon; Aufleger, Markus; Hofer, Michael
Data(s)

01/08/2014

Resumo

While the simulation of flood risks originating from the overtopping of river banks is well covered within continuously evaluated programs to improve flood protection measures, flash flooding is not. Flash floods are triggered by short, local thunderstorm cells with high precipitation intensities. Small catchments have short response times and flow paths and convective thunder cells may result in potential flooding of endangered settlements. Assessing local flooding and pathways of flood requires a detailed hydraulic simulation of the surface runoff. Hydrological models usually do not incorporate surface runoff at this detailedness but rather empirical equations are applied for runoff detention. In return 2D hydrodynamic models usually do not allow distributed rainfall as input nor are any types of soil/surface interaction implemented as in hydrological models. Considering several cases of local flash flooding during the last years the issue emerged for practical reasons but as well as research topics to closing the model gap between distributed rainfall and distributed runoff formation. Therefore, a 2D hydrodynamic model, depth-averaged flow equations using the finite volume discretization, was extended to accept direct rainfall enabling to simulate the associated runoff formation. The model itself is used as numerical engine, rainfall is introduced via the modification of waterlevels at fixed time intervals. The paper not only deals with the general application of the software, but intends to test the numerical stability and reliability of simulation results. The performed tests are made using different artificial as well as measured rainfall series as input. Key parameters of the simulation such as losses, roughness or time intervals for water level manipulations are tested regarding their impact on the stability.

Formato

application/pdf

Identificador

http://academicworks.cuny.edu/cc_conf_hic/319

http://academicworks.cuny.edu/cgi/viewcontent.cgi?article=1318&context=cc_conf_hic

Idioma(s)

English

Publicador

CUNY Academic Works

Fonte

International Conference on Hydroinformatics

Palavras-Chave #2014 International Conference on Hydroinformatics HIC #Hydrodynamic Modelling #Emerging Modelling Paradigms and Model Coupling #direct rainfall runoff model #flash flood #2D hydrodynamic model #R31 #Hydrologic Modeling Catchment and Runoff Computations #Environmental Sciences #Physical Sciences and Mathematics #Water Resource Management
Tipo

presentation