| The hydrogeological parameters of aquifer is an important index to measure the hydraulic properties and water storage properties,is an important basic data for evaluation of groundwater resources,it is one of the important research work of hydrogeological exploration and test in the evaluation of groundwater resources determine the hydrogeological parameters of aquifer.For a homogeneous aquifer,with enough pumping test data,whether by analytical method and numerical method are more accurate hydrogeologic parameter,and for the two methods of heterogeneous aquifers have error.The purpose of this paper is to inverse the parameters of numerical and analytic methods for different aquifers,and compare the inversion results to determine the applicability of the two methods.Methods: This study is based on the theory of geostatistics,the geological statistical nature changes of hydrogeological parameters,control heterogeneity,and generates the random field parameters of the aquifer,the aquifer by the Gauss random field to generate different heterogeneous intensity.By means of the simulated pumping test data,the analytic method and numerical method are used to calculate the hydrogeological parameters.The accuracy of the two methods is analyzed and compared,and the applicability of the two methods is determined.The results show that: the parameter inverse with predefined proximity values,analytical method and numerical method have advantages and disadvantages,the error in the study of error analytical method of hydrogeological parameters reverse than numerical method in reverse,and for the inversion calculation is superior to the method of groundwater numerical analytic method head value.In calculating non homogeneous aquifer permeability coefficient is recommended using both analytical method and numerical method,although the accuracy of permeability coefficient by numerical inversion without analytical method is high,but has higher accuracy in the estimation of groundwater head value. |
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