INTEGRATED OPTIMAL MANAGEMENT OF GROUNDWATER POLLUTION AND WITHDRAWAL

An integrated ground-water management model is formulated as a multiva riable constrained nonlinear optimization problem. To simulate the phy sical and chemical processes occurring within a leaky confined aquifer system, the finite-difference forms of the now and transport equation s are embedded in the management model. The Hooke-Jeeves method, a non linear programming technique, in conjunction with the exterior penalty function method is used to solve this management model. The suitabili ty and capability of this method to solve the management problems for study areas of different sizes and different numbers of management per iods are demonstrated. The performance evaluation of this proposed met hodology establishes its potential applicability for the solutions of different kinds of ground-water management problems. The developed met hodology also demonstrates the suitability of the embedding technique to solve a dimensionally large nonlinear ground-water management probl em. The proposed methodology does not require the linking of simulatio n and optimization models externally. It is shown that global optimali ty of obtained solutions is dependent on the extensive identification of local optimal solutions and the accuracy in prescribed aquifer char acteristics.