| Water is not only a precious resource for life, but also a sensitive factor of the society. Porous groundwater is the major type of groundwater. And porous groundwater is a high-quality drinking water. It has great future of valuable development. Porous groundwater is the main resource both in industry and people’s daily life, where surface water has been widely polluted. Massive pumping of groundwater will lead to ecological, environmental problems and growing geological disasters. For instance, land subsidence, seawater intrusion, salt water intrusion, desertification and deterioration of water quality. Unilateral take compression of the groundwater exploitation will lead to land paludification and waste of land. We cannot make full use of groundwater.With Hvdrological Geoloev. Groundwater Kinetic. Geometry Topology Geographical Information System and Computer Science, and the Groundwater Three-dimensional Numerical Simulation Technology, Hydrological Geological Three-dimensional Modeling Methods, Groundwater Management Modeling function, GIS Spatial Analysis and Scientific Visualization Technology, the paper adopt the theoretical research, paper mathematical model, the prototype system, data validation technology method, from the angle of experiment study area hydro-geology particularity, put forward by use of the weakly permeable layer anisotropic true three-dimensional model to simulate the pore underground water flow movement situation, to reduce the error of the simulation. The semi-permeable layer of experimental samples is alluvial causes, namely the groundwater system hydrogeology structure level direction the permeability coefficient of far greater than vertical direction of the permeability coefficient, do not accord with quasi three-dimensional isotropic model application the prerequisite.Firstly, the paper analysis three dimensional fluid-solid coupling unsteady flow model of porous groundwater aquifer (group) for study area. The paper derives the soil compression equation coupling the three dimensional unsteady flow model, combined with anisotropic pore aquifer flow equation of flow continuity. Finally we couple groundwater flow problems and consolidation problems. The model adapts to loose-rock aquifer of alluvial plain (group) type. Soil pressure becomes dense, and porosity and porosity decreases in the process of soil consolidation at the same time. It will change the permeability coefficient of soil and unit water coefficient. The paper puts forward the method based on the nonlinear compression change.Secondly, the paper build three-dimensional dynamic model of aquifers for study area to combine visualization and computation of porous groundwater aquifers. Currently, hydro-geological generalized model is constant hydro-geological structure when the management model is built, operated and quit in the simulation. But excessive porous groundwater pumping will reduce groundwater aquifer porosity which leads to a semi-permeable layer elastic or plastic deformation during which irreversible plastic. Considering the groundwater management model coupling numerical simulation model, the paper couples numerical simulation model with hydro-geological structure model to solve the soil seepage field and stress field of the coupling problem. By doing this, we solve the relationship between stress of different groundwater flow model and pore hydrological geology structure model. The paper researches on aquifers (group) concept model, tetrahedral vexed definition, tetrahedral vexed cutting and tetrahedral data structure. According to the elevation changes quantity, we rebuild the geological-mass model. The paper establishes the three-dimensional dynamic model of the study area.Thirdly, the paper build porous groundwater optimal management model that focus on "massive pumping and controllable land subsidence". Groundwater resources dynamic programming model in china or abroad is mostly underground water resources allocation dynamic programming. A lot of research focuses on "static problem" namely the multi-stage decision problem of the distribution of groundwater resources. We combine the pore groundwater management model and the three dimensional numerical simulation model, considering protecting the ground settlement controlled environment geology, to make joint solution to biggest new calculation and numerical simulation model so as to calculate the groundwater level. At the same time, in view of the aquifer system for heterogeneity, anisotropy and the natural hydrological geology characteristics of unit boundary characterizations, the paper solves the response matrix based on the finite element numerical method.Finally, we choose Wujin area in Changzhou city as the study area to verify the validity of generalized three dimensional dynamic management porous groundwater model based on GIS. With a correct understanding of the conditions of groundwater occurrence of the study area, we are according to the experimental samples of pumping test results, and near Yangtze River’s large group pumping test data, the paper calculates the hydrogeology parameters. Then, we generalize hydrogeology conditions of the study area. we divide the sample area into three-dimensional units, determine the initial water level, choose observation bole holes, parameter zoning, determine the second unit discharge, supply boundary determine the initial hydrogeology parameters, fitting observation hole water level and ground settlement in order to verify the generalized porous groundwater three-dimensional dynamic management model. Based on the three worked groundwater exploitation scheme, we can simultaneously forecast the changes of groundwater flow field and three dimensional ground settlement of the study area five years later and ten years later, thus verify the correctness of generalized porous groundwater three-dimensional dynamic management model based on GIS. |
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