عنوان مقاله [English]
In this paper, an optimization model has been developed for computing the optimum sizing of a combined structural flood control system. The combination of a dam and a levee has been considered in this study without losing the generality of approach for other structural combinations. Compared to the previous studies, this study uses less simplicity assumptions. For example the geometry of the river and the levee were considered with more details and the levee were considered non-symmetric along the river axis. The optimization problem formed a large-scale nonlinear model with the objective to maximize the expected annual net benefits of the developed system, to result the optimum design return period (i.e. design flood), as well as, the optimum size of the system components, such as dam height, spillway dimensions, and levee’s height and setback. The Tang-e-sorkh River and the flood control system (under study) in Shiraz, Iran, have been selected as a case study. The model solution proposed a combined dam and levee system, with a design return period of 1000 years.