Comparison of 1D/1D and 1D/2D Coupled (Sewer/Surface) Hydraulic Models for Urban Flood Simulation
Publication: Journal of Hydraulic Engineering
Volume 135, Issue 6
Abstract
Recent developments in flood modeling have led to the concept of coupled (sewer/surface) hydraulic models. In this paper two coupled models are examined; a one-dimensional (1D) sewer model coupled with a 1D surface network model (1D/1D) and a 1D sewer model coupled with a two-dimensional (2D) surface flow model (1D/2D). Flow over the terrain is better modeled by 2D models, whereas in confined channels 1D models provide a good approximation with less computational effort. This paper presents a comparison of the simulation results of 1D/1D model and a 1D/2D model. The methodology adopted for setting up the models is outlined and explained in detail as well as the 1D/1D modeling techniques used for reproducing the 1D/2D model results. The surface flow comparison clarifies the limitations of the 1D/1D model and indicates that the definition of the surface pathways, the linking elements sewer/surface, and inclusion of virtual manholes are key factors for setting up a more accurate 1D/1D model.
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Acknowledgments
The research presented in this paper was funded by the UK Engineering and Physical Sciences Research Council project Flood Risk Management Research Consortium (FRMRC) Work Package 6.1 (Grant No. UNSPECIFIEDGR/S76304/01). The writers are grateful to Surajate Boonya-aroonnet for generating the 1D surface network of the case study, to Adrian Saul and John Blanksby for numerous fruitful discussions, to Barry Evans for improving the clarity of the paper, and to anonymous reviewers for their helpful comments.
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Information & Authors
Information
Published In
Journal of Hydraulic Engineering
Volume 135 • Issue 6 • June 2009
Pages: 495 - 504
Copyright
© 2009 ASCE.
History
Received: Apr 3, 2008
Accepted: Dec 10, 2008
Published online: Feb 25, 2009
Published in print: Jun 2009
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