Abstract
In this study, it is aimed to develop the flood risk analysis of Porsuk River, which is responsible for naming of the Porsuk Basin sub basin of Sakarya Basin, by utilizing the methods of Remote Sensing (RS) and Geographical Information Systems (GIS). In addition, flood elevation effects of Porsuk River in Eskisehir city and the regions around were investigated. Necessary data for study were obtained from Eskisehir 3. Regional Directorate of State Hydraulic Works archives. For analyses, the cross section of Porsuk River was defined in the Hydrologic Engineering Centers River Analysis System (HEC-RAS) software. Subsequently, recurring periods of 50, 100 and 1000 years discharge of Porsuk River which is calculated as 51.83 m3/s, 60.15 m3/s and 86.66 m3/s respectively were inputted in the software to obtain analysis results. Obtained results from the present study and topographic data were compared and interpreted. As a result, elevation of flood and its risks for urban regions were studied and presented.
Highlights
361.6 km2 of the Porsuk basin, which encompasses the province of Eskişehir, was investigated using Geographical Information Systems (GIS)
Porsuk dam was built for flood prevention after past flood events
This part of the basin has the potential for flooding due to sudden and continuous rains, as well as due to potential scenarios such as the collapse of the dam
Summary
Floods are defined as the occurrence of a natural disaster by a river overflowing. Floods may occur naturally or may be caused by irregular urbanization, closure of river beds, destruction of vegetation and insufficient precautions. Within the scope of this study, flood modeling studies have been carried out in the regions where Porsuk Stream in Porsuk Basin passes through the center of Eskişehir. For this purpose, numerical elevation model (NEM) and HEC-RAS (HEC, 2010) based hydraulic models of the basin area were established in a geographical information systems (GIS) environment. Flood scenarios were developed for Eskişehir province and the regions with risk of flood were determined using these flow rates obtained for these different recurring periods
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