Overland Flow Simulations in an Urban Catchment: A Straightforward Approach to Considering Culverts
Publication: Journal of Hydrologic Engineering
Volume 26, Issue 3
Abstract
Existing overland flow models tend to neglect culvert flow. The goal of the present study is to implement a straightforward and easily realizable representation of culvert flow into the overland flow module of the OpenGeoSys (OGS) multiphysics simulator. Culverts are represented as source and sink terms in the modified OGS model. As a simplification, the flow rate at the culvert is calculated based on water depth and hydraulic head at the inlet and outlet of the culverts with the Darcy-Weisbach equation for pipe and channel flow. For validation of the newly implemented culvert representation, model results of culvert flow have been compared with results from the pipe flow model HYSTEM-EXTRAN (HE). The results of this comparison agree well for fully filled pipes. However, if there is an increasing difference between water depth at the inlet and outlet of the culvert, the quality of the results is decreasing. This is due to the fact that the Darcy-Weisbach equation does not consider accelerated or delayed flow. The model has been tested on a real study area and provides reasonable results where culvert flow is qualitatively well represented. Analysis of results shows that the consideration of culverts as presented here satisfies mass conservation.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
We want to thank the editorial coordinator and editor for handling the manuscript. We further want to thank the editor and three anonymous reviewers for taking their time to carry out such a thorough review. All raised points have improved the quality of the manuscript.
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Published In
Journal of Hydrologic Engineering
Volume 26 • Issue 3 • March 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Mar 18, 2020
Accepted: Sep 25, 2020
Published online: Dec 28, 2020
Published in print: Mar 1, 2021
Discussion open until: May 28, 2021
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