انجمن هیدرولیک ایران نشریه علمی هیدرولیک 2345-4237 6 3 2011 11 22 Risk Analysis for Dam Overtopping Considering Hydraulic and Hydrologic Parameters (Vanak Dam as a Case Study) تحلیل خطر روگذری آب در سد با در نظر گرفتن جنبه های هیدرولیکی و هیدرولوژیکی (مطالعه موردی: سد ونک) 39 53 85487 10.30482/jhyd.2011.85487 FA عبدالرضا کبیری سامانی دانشیار، دانشکده مهندسی عمران، دانشگاه صنعتی اصفهان 0000-0002-5984-3892 نیکو منصوری امیررضا سدهی سامانی Journal Article 2011 03 23 In this study, a probability- based methodology is formulated to evaluate quantitatively and<br />systematically the overtopping risk of earth dams. This study considers the overtopping phenomena<br />induced by the occurrence of flood and wind effects. The risk analysis based models for overtopping<br />consist of random modeling of the flood generation, wind dynamic aspects, reservoir routing, reservoir<br />geometry, inflow discharge, outflow discharge, dam height, initial water surface and correction factor<br />for increasing water induced by wind. For calibrating the results of simulation and modeling, Vanak<br />dam in Charmahal Bakhtiari is used as a case study. The case study was employed to demonstrate how<br />the total risk of overtopping over a practical case could be estimated based on the proposed<br />methodology. Annual maximum series of peak flow discharge and wind velocity of Vanak dam are<br />used to analyze extreme flood and wind with different frequencies by using hydrological frequency<br />analysis software (HYFA). Risk analysis results show that considering uncertainties of random<br />parameters affects significantly the dam reliability. Also overtopping risk of Vanak dam is not<br />sensitive to increasing initial water surface. By increasing uncertainty of inflow flood, overtopping<br />risk is increased.Risk overtopping increases, while the uncertainty of reservoir geometry increased.<br />Also dam reliability is decreased by malfunction of spillway’s gates. Based on this analysis both the<br />effect of wind and flood together influence the overtopping risk of earth dam. https://jhyd.iha.ir/article_85487_a7a1267e0f71026635cf504276e6df81.pdf