Abstract
Two multi-objective management models are applied on a local area selected from the regional Gaza coastal aquifer. The objectives and constraints of these management scenarios include maximizing the total volume of water pumped, minimizing the salt concentration of the pumped water, and controlling the drawdown limits. The physical model is based on the CODESA-3D density-dependent advective-dispersive solute transport model. Genetic algorithm is used as the optimization tool. The models are tested on a part of the aquifer ( ) with 9 existing pumping wells located at various depths. The results of the optimization show that the optimization/simulation approach can give better decision if there is enough information to feed to the model. It confirms that the use of the concept of safe yield alone is not enough for sustainable develop-ment of the coastal aquifer. It shows that the optimum pumping rate is in the range of 26%–34% of the total natural replenishment. The application shows that the proposed technique is a powerful tool for solving this type of management problems.
Highlights
Water is the most precious and valuable natural resource in the Middle East in general and in Palestine (Gaza strip) in particular
The results of solution of model 2 with the constraint of minimum head of 1m above mean see level (AMSL) are presented in Table 6 and Figure 6
This study presented the numerical solution of maximum pumping rate of wells located in seawater invaded coastal aquifer in the Gaza Strip
Summary
Water is the most precious and valuable natural resource in the Middle East in general and in Palestine (Gaza strip) in particular. Problems can occur when excessive pumping at certain individual wells lowers the potentiometric surface locally and causes upconing of the interface between fresh water and saline water [1] To combat these situations, saltwater intrusion management models need to be implemented to design optimal and sustainable groundwater abstraction strategies. The models are tested on a hypothetical confined aquifer with 4 pumping wells located at various depths These solutions establish the feasibility of simulating various management scenarios under complex three-dimensional flow and transport processes in coastal aquifers for the optimal and sustainable use of groundwater. Two multi-objective management models of saltwater intrusion was applied on a local area selected from the Gaza coastal regional aquifer and solved using the same approach presented by Qahman et al [5]. The saltwater intrusion management problem presented in this work will give more insight in the planning and future management of the study area
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