Research On Three-dimensional Geologic Modeling And Numerical Simulation Of Groundwater In Xiliao River Plain

In this dissertation, the development history of numerical simulation model and managementmodel of groundwater is reviewed firstly. Then the existing problems and the disadvantage ofgroundwater simulation and management model for our country are also illustrated. And finallythe trend of groundwater simulation model and management model are also prospected. Aimed atthe feature that the current three-dimensional (3D) geologic modeling technology is mainly suitfor small regions, a new method has been put forward in this dissertation. The method combinedseveral GIS software and based on the EAST software, in result, the complex geologic contents oflarge regions in 3D has been visualized. Based on the detailed analysis of geology andhydro-geologic feature of interest area, and from the point of aquifer, 3D geologic architecturemodel is further simplified and then the 3D hydro-geologic architecture model of interest area isconstructed. On the basis of the above study, hydro-geologic conceptual model is developed byusing the method of conceptual model, which involves the description of equilibrium elements,distribution of flow and parameters of study area in the form of feature objects (points, arcs andpolygons). By using FEFLOW, which is based on Finite element method, the groundwatersimulation model is developed, and the solution of the equation for quasi-three-dimensiongroundwater flow has been got. At last, the evaluation of groundwater dynamic and water resourceunder the conditions for given exploitation plan has been done by the Model.According to the regional model and the synthetical analysis of future planning on key studyarea, this dissertation focuses on Ke'erqin region of Tongliao City, and defines its managementobject. Within the restriction of groundwater table, water supply planning, water supply capacityand so on, single-object management model of groundwater resource has been set up with yield asthe maximum objective function. Then, by using LINGO software to solve the function, themaximum safe yield of well field in the main study area, the optimal exploitation scheme has beenput forward, and has defined that the most potential place to exploit is well field in the electricpower plant. When constituting regional economic development, the management model is to beused as a reference. The optimal result can be entered into the established numeric model topredict the groundwater dynamic trend under the condition of maximum safe yield.In conclusion, the research indicates that the total recharge of the study area is440167.52×104m3, the total discharge is 537744.66×104m3, the balance is -97577.14×104m3 insimulated period (2003.7-2004.6), the natural recharge is 576846.7×104m3/a, the exploitingpotential is within 310712.33×104m3/a, and the maximum safe yield of well field in key study areais about 30657.90×104m3/a.