Research On Simulation Technology Of Pumping Test Of Pore Water

Groundwater is an important water source.The heavy over-exploitation of the groundwater resources will cause a series of problems such as ground subsidence,water pollution and so on.Pumping test is an important hydrogeological test method to determine hydrogeological parameters of aquifer and support to formulate the project of groundwater exploitation.The existing pumping test analysis to show water level change is limited in two dimensional planes.In order to describe the dynamic changes of groundwater flow in the process.of pumping test more intuitive and reliable,based on groundwater dynamics,hydrology geology,geographic information science and computer science,this paper creates the three-dimensional flow field on the basis of three-dimensional hydrogeological model to reflect the dynamic change of groundwater both in time and space in the process of pumping test.The main results and conclusions are as below.(1)The integration technology of pore groundwater flow model and three-dimensional hydrogeological model.According to the principle of groundwater dynamics and hydrogeology,this paper establishes the three-dimensional model of internal hydrogeological layer in groundwater system based on borehole data,and presents the stratum distribution,hydrogeological conditions and the storage and utilization of groundwater in study area.This paper also establishes the three-dimensional pore groundwater model based on the dynamic monitoring data from monitoring wells,and uses lines with a dot on one end and an arrowhead on the other to indicate the direction the groundwater flow field which can show the direction and speed of groundwater movement more intuitively.And the three-dimensional hydrogeological model and the three-dimensional pore groundwater model are integrated in the same coordinate system,which can comprehensively describe the hydrogeology structure,the spatial distribution of water level and water movement,(2)Dynamic 3D visualization of groundwater in different drawdown condition.According to the drawdown in the process of pumping test and the initial water level,generate the DTM model to show the feature of water distribution.Calculate the water flow with Darcy’s Law.Indicate the water sport by point the arrow method.Compare 3D groundwater flow field of different darwdown condition to realizing visualization of landing funnel forming process.(3)The integrated expression of 3D flow field of groundwater and test 3D scene.According to a single observation well water level monitoring data of actual land change over time,using optimization method calculated aquifer hydrogeological parameters.In the study area,the local area is taken as a pumping test field.According to the mathematical model of the pumping test under certain conditions,is obtained by using the Theis analytical solution of pumping water landing of different location,different time according to some point drawdown data to construct 3D groundwater flow field,simulate the scene of convection field pumping test influence,and realize the integrated expression of 3D flow field of groundwater and test 3D scene.