Details
| Original language | English |
|---|---|
| Article number | 06020006 |
| Journal | Journal of hydrologic engineering |
| Volume | 26 |
| Issue number | 3 |
| Publication status | Published - 28 Dec 2020 |
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.
Keywords
- Culverts, OpenGeoSys, Overland flow, Surface runoff, Urban floods
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Chemistry
- Engineering(all)
- Civil and Structural Engineering
- Environmental Science(all)
- Water Science and Technology
- Environmental Science(all)
- General Environmental Science
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In: Journal of hydrologic engineering, Vol. 26, No. 3, 06020006, 28.12.2020.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Overland Flow Simulations in an Urban Catchment
T2 - A Straightforward Approach to Considering Culverts
AU - Jankowski, Raoul
AU - Wallner, Markus
AU - Peche, Aaron
AU - Graf, Thomas
AU - Verworn, A.
PY - 2020/12/28
Y1 - 2020/12/28
N2 - 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.
AB - 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.
KW - Culverts
KW - OpenGeoSys
KW - Overland flow
KW - Surface runoff
KW - Urban floods
UR - http://www.scopus.com/inward/record.url?scp=85098727152&partnerID=8YFLogxK
U2 - 10.1061/(ASCE)HE.1943-5584.0002040
DO - 10.1061/(ASCE)HE.1943-5584.0002040
M3 - Article
AN - SCOPUS:85098727152
VL - 26
JO - Journal of hydrologic engineering
JF - Journal of hydrologic engineering
SN - 1084-0699
IS - 3
M1 - 06020006
ER -