Regional Flood Frequency Analysis Around Seyhan Basin - Çiltaş, Efe; Bakar, Hamza; Eldayıh Kanber, Yasemin; Öz, Müberra; Kesmez, Ekrem; Önöz, Bihrat; Yılmaz, S. Utku (2022)
In the 21st century, floods, which are frequent disasters due to the increasing temperature all over the world together with the global climate change, and consequently heavy, sudden precipitations and sudden snowmelt, cause great economic, ecological, and environmental damage and even loss of life. In addition, floods occur due to increased unauthorized construction in the floodplains, improperly applied river regulation studies, and especially incorrect determination of the design (project) discharge for the structures. In this study, according to the flow data obtained from the stations belonging to the Seyhan Basin, firstly several analyses were made for each station separately, then a regional analysis was made for all stations. Here, the annual maximum flow data for 8 different stations were obtained from the flow observation annuals of the General Directorate of State Hydraulic Works. For these data, compliance tests for various distributions were made based on a single station and flow estimations were made for each station in particular return periods by using the design discharge flood forecasting methods. Afterward, the regional flood frequency analysis was done by using several trend analysis methods. Then, a regional flood curve was obtained. In this way, a curve was found to obtain the current value even in the regions where there are no current records. Then, it has been determined that the regional curve fits successfully with the individual results when the individual and regional results are compared.
Keywords: cc-by-sa-4.0; flood frequency analysis; regional analysis; regional flood curve; trend analysis