Application of Proxy Simulators in Groundwater Simulation Optimization
Simulation optimization techniques are often used to address many problems of groundwater management. In these techniques an aquifer simulation model is coupled with an optimization algorithm to get the optimal solution. Simulation model normally engages a finite difference, finite element or a mesh free technique. ANN and SVM based proxy simulators are used in this study to replace the FEM simulation model. When the objective function in the study is implicit, its gradient cannot be determined with respect to the decision variables which restrain the use of gradient based optimization methods. In this study differential evolution optimization model is used to minimize the collective drawdown for obtaining an optimal pumping policy for the aquifer system. The ANN and SVM based simulation optimization models result in noteworthy saving of computational time.
The North Xinjiang Water Supply Project is a large and long distance water supply project,of which the construction organization design is quite complicated.Within the construction design,the key technical points are the constructions of a tunnel in weak rock,three kinds of inverted siphons and a large channel in desert,and the plannings of both borrow area and the balance of the earth-rock excavation and fill as well as the construction water supply,etc.In conjunction with the construction of the project,the problems given above are briefly discussed herein.