Study On Integrated Use Of Surface Water And Groundwater In Coastal Water-deficient Irrigation Region On Theory And Its Application

With the increase of population and development of economy, the conflict between water supply and requirement is aggravating, and the integrated use of surface water and groundwater is an effective approach to solve the conflict. So the integrated use of surface water and groundwater as the main purpose in this paper, the research results at home and abroad were reviewed, and the theory and applying of groundwater simulation model in coastal water shortage irrigation, the model of optimization of water delivery for crops and the coupled model of surface water and groundwater and so on were researched. Study content including:(1) The situation of water resource exploitation and utilization was analyzed. The path graph and generalization chart of water circulation for coastal water shortage irrigation was given, and groundwater simulation model was established.(2) Based on the theory of water consumption of crops and water saving irrigation, and according to the principle of fully utilizing rainfall and crop high yielding, the model of optimal water delivery for crops in water storage irrigation was established.(3) The coupling of optimization water delivery and groundwater and the coupled model for the integrated use of surface water and groundwater in coastal water shortage irrigation were analyzed.(4) By making use of ergodicity of chaos optimization algorithm, the artificial fish swarm algorithm was improved by combining chaos optimization algorithm with artificial fish swarm algorithm, and obtain a new intelligent optimization method-chaos and artificial fish swarm algorithm.(5) The solving method for the coupled model was studied. The groundwater simulation model was solved by MODFLOW2000, in which the rainfall infiltration was calculated with land water balance equation and irrigation infiltration was calculated with soil water balance equation. The chaos and artificial fish swarm algorithm was used to solve the model of optimal water delivery for crops. The iterative solution of the coupled model was given. Information and management system for the integrated use of surface water and groundwater was developed.(6) Applying the model to water saving irrigation demonstration plot in Weihai, Shandong province, the scheme of the integrated use of surface and groundwater in 2010 was obtained. The movement of groundwater with the scheme simulated and analyzed.(7) According to the theory and application research results, the conclusion and questions need to be studied deeply was presented.