Journal of Hydraulics

Journal of Hydraulics

Two-dimensional flood simulation and investigating the effect of control structures on the hydraulic characteristics of the flow in the Koran Gate basin of Shiraz using UAV and satellite data

Document Type : Research Article

Authors
1 Dept. of water sciences and engineering, agricultural collage, Jahrom University
2 Dept. of Remote Sensing, Tarbiat Modares University
Abstract
In April 2018, a damaging flood occurred in the Koran Gate basin of Shiraz, causing significant disruption and damage to the region. To mitigate the risk of future floods, the Natural Resources and Watershed Organization of Fars province constructed six retarding dams in the area. The primary aim of this study is to assess the impact of these dams on various flood scenarios using hydraulic simulation techniques. To achieve this, data from the ALOS (Advanced Land Observing Satellite) digital elevation model and an Unmanned Aerial Vehicle (UAV) survey were utilized for accurate terrain representation. The numerical simulations revealed that the flood control structures implemented in this region played a crucial role in managing floods during periods of heavy rainfall. Specifically, the study analyzed the effectiveness of these structures by comparing hydraulic simulation results derived from UAV and ALOS digital elevation models. The UAV survey provided high-resolution topographic data, which was instrumental in creating detailed and accurate hydraulic models. The results from the UAV-based hydraulic simulations indicated that the flood control dams significantly reduced the maximum flood flow by 47%, and delayed the peak flood time by 36 minutes. This substantial reduction in peak flow and delay in peak time highlights the effectiveness of the dams in mitigating flood risks. In contrast, the hydraulic simulations based on the ALOS satellite data showed a 15% reduction in the maximum effective flow and an 18-minute delay in the peak flood time. While both models demonstrated the beneficial impact of the flood control structures, the UAV model provided a more pronounced and accurate depiction of their effectiveness. In conclusion, this study underscores the importance of using high-resolution data for hydraulic modeling and flood management. The construction of retarding dams in the Koran Gate basin has proven to be a significant measure in flood risk reduction, with the UAV survey offering a more detailed assessment compared to the ALOS satellite data. These findings can inform future flood management and mitigation strategies in similar regions prone to flooding.
Keywords

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  • Receive Date 02 June 2024
  • Revise Date 19 July 2024
  • Accept Date 10 September 2024