In this study, a probability- based methodology is formulated to evaluate quantitatively and systematically the overtopping risk of earth dams. This study considers the overtopping phenomena induced by the occurrence of flood and wind effects. The risk analysis based models for overtopping consist of random modeling of the flood generation, wind dynamic aspects, reservoir routing, reservoir geometry, inflow discharge, outflow discharge, dam height, initial water surface and correction factor for increasing water induced by wind. For calibrating the results of simulation and modeling, Vanak dam in Charmahal Bakhtiari is used as a case study. The case study was employed to demonstrate how the total risk of overtopping over a practical case could be estimated based on the proposed methodology. Annual maximum series of peak flow discharge and wind velocity of Vanak dam are used to analyze extreme flood and wind with different frequencies by using hydrological frequency analysis software (HYFA). Risk analysis results show that considering uncertainties of random parameters affects significantly the dam reliability. Also overtopping risk of Vanak dam is not sensitive to increasing initial water surface. By increasing uncertainty of inflow flood, overtopping risk is increased.Risk overtopping increases, while the uncertainty of reservoir geometry increased. Also dam reliability is decreased by malfunction of spillway’s gates. Based on this analysis both the effect of wind and flood together influence the overtopping risk of earth dam.
Kabiri-Samani, A., Mansouri, N., & Sedehi-Samani, A. (2011). Risk Analysis for Dam Overtopping Considering Hydraulic and Hydrologic Parameters (Vanak Dam as a Case Study). Journal of Hydraulics, 6(3), 39-53. doi: 10.30482/jhyd.2011.85487
MLA
Abdorreza Kabiri-Samani; N. Mansouri; A.R. Sedehi-Samani. "Risk Analysis for Dam Overtopping Considering Hydraulic and Hydrologic Parameters (Vanak Dam as a Case Study)". Journal of Hydraulics, 6, 3, 2011, 39-53. doi: 10.30482/jhyd.2011.85487
HARVARD
Kabiri-Samani, A., Mansouri, N., Sedehi-Samani, A. (2011). 'Risk Analysis for Dam Overtopping Considering Hydraulic and Hydrologic Parameters (Vanak Dam as a Case Study)', Journal of Hydraulics, 6(3), pp. 39-53. doi: 10.30482/jhyd.2011.85487
VANCOUVER
Kabiri-Samani, A., Mansouri, N., Sedehi-Samani, A. Risk Analysis for Dam Overtopping Considering Hydraulic and Hydrologic Parameters (Vanak Dam as a Case Study). Journal of Hydraulics, 2011; 6(3): 39-53. doi: 10.30482/jhyd.2011.85487