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Rainfall-Runoff Modeling to Investigate Flash Floods and Mitigation Measures in the Wadi Bili Catchment, Egypt
The aim of this study is to analyze the rainfall-runoff behavior in the Wadi Bili catchment in the Red Sea Governorate of Egypt as well as the impact on the city of El Gouna, which is located in the downstream part of the catchment. To analyze the runoff from the wadi catchment a hydrological catchment model was set-up with the STORM software and calibrated to runoff measurements during the flash flood event in March 2014. Three different rainfall scenarios were simulated and compared: 34 mm of accumulated rainfall (event in March 2014), 45 mm (estimated 100-year event) and 90 mm (assumed worst-case scenario). The results show a strongly non-linear relation between rainfall and runoff, where an increase in the rainfall amount leads to a much stronger increase in peak discharge. A proposed strategy to mitigate the flooding and store the water could completely capture the flood event in March 2014, while the peak discharge during the 100-year event could be reduced by only 30% and the peak discharge during the assumed worst-case scenario could not be reduced at all. To simulate in more detail the flooding conditions in the city area, a 2D shallow water model was applied using the output from the hydrological model as inflow. Regarding the simulated water depths in El Gouna, it could be shown that for the cases with 34 mm and 45 mm of accumulated rainfall the local rainfall played are more important role than the inflow from the upstream catchment, while for the case with 90 mm of accumulated rainfall the inflow from upstream was more important than the local rainfall.
Rainfall-Runoff Modeling to Investigate Flash Floods and Mitigation Measures in the Wadi Bili Catchment, Egypt
The aim of this study is to analyze the rainfall-runoff behavior in the Wadi Bili catchment in the Red Sea Governorate of Egypt as well as the impact on the city of El Gouna, which is located in the downstream part of the catchment. To analyze the runoff from the wadi catchment a hydrological catchment model was set-up with the STORM software and calibrated to runoff measurements during the flash flood event in March 2014. Three different rainfall scenarios were simulated and compared: 34 mm of accumulated rainfall (event in March 2014), 45 mm (estimated 100-year event) and 90 mm (assumed worst-case scenario). The results show a strongly non-linear relation between rainfall and runoff, where an increase in the rainfall amount leads to a much stronger increase in peak discharge. A proposed strategy to mitigate the flooding and store the water could completely capture the flood event in March 2014, while the peak discharge during the 100-year event could be reduced by only 30% and the peak discharge during the assumed worst-case scenario could not be reduced at all. To simulate in more detail the flooding conditions in the city area, a 2D shallow water model was applied using the output from the hydrological model as inflow. Regarding the simulated water depths in El Gouna, it could be shown that for the cases with 34 mm and 45 mm of accumulated rainfall the local rainfall played are more important role than the inflow from the upstream catchment, while for the case with 90 mm of accumulated rainfall the inflow from upstream was more important than the local rainfall.
Rainfall-Runoff Modeling to Investigate Flash Floods and Mitigation Measures in the Wadi Bili Catchment, Egypt
Springer Water
Gourbesville, Philippe (editor) / Caignaert, Guy (editor) / Tügel, Franziska (author) / Abdelrahman, Abdelrahman Ali Ahmed (author) / Özgen-Xian, Ilhan (author) / Hadidi, Ahmed (author) / Hinkelmann, Reinhard (author)
2020-07-26
15 pages
Article/Chapter (Book)
Electronic Resource
English
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