Akademik Veri Yönetim Sistemi
IWA 4th Regional Conference on Diffuse Pollution and Eutrophication, İstanbul, Türkiye, 24 - 28 Ekim 2022, ss.492-494, (Tam Metin Bildiri)
This study aims to investigate the effects of a possible dam failure under various likely scenarios and to derive an empirical formula for estimating peak flood flowrate at the downstream of the dam body after dam failure. Darlık Dam is located in Istanbul, Turkey and an earth-fill gravity dam. The downstream area of Darlık Dam is selected as the study area since this region has a high-density residential area. The dam failure scenarios are examined under three criteria which are the most sensitive parameters for the dam failure analysis. These parameters are bottom breach width (BBW), side slope (SS), and the breach development time (BDT). It is seen that the BBW is the most sensitive parameter among them. On the other hand, SS affects the peak values of dam breach scenarios slightly. Furthermore, the empirical formula is derived to predict the peak outflow occurred after dam break as a function of SS, BDT, and BBW. In this study, Hydrologic Engineering Center-River Analysis System (HEC-RAS) software program is used for dam break analysis. Coefficients of the empirical formula are determined by using meta-heuristic algorithms. For analyses, 840 simulations are performed in this study to develop empirical formula. The reliability of the empirical formula is evaluated by calculating the absolute per cent error between the peak value of the simulation results obtained by HEC-RAS and the calculated peak flowrate obtained by empirical formula. The results show that the performance of the empirical formula is satisfactory.