| Aquifer is a complex geotechnical material,its permeability characteristics in both horizontal and vertical directions are spatially variability and heterogeneity.This paper investigates the key hydrogeological problems of the spatial distribution of the aquifer in the Qaidam Basin,which is arranged around the secondary project,using continuous linear estimation methods and information fusion techniques,developing study on hydraulic tomography scan of permeability of the Aquifer of the Bayin River Alluvial Fan,revealing the heterogeneity of aquifers,characterizing Spatial distribution characteristics of aquifer permeability coefficient.The main research contents of this paper and its important achievements include:?An underground aquifer chromatography test system was developed,and an indoor sandbox pumping test was carried out.Based on the test results,the hydrodynamic tomography scan of the aquifer aquifer reveals the heterogeneity of the hydraulic parameters of the aquifer and verifies the feasibility of the Hydraulic tomography scanning method.?Collecting and arranging hydrogeological data of alluvial fans in the Bayin River Basin,and analyzing the monitoring data of the alluvial fan aquifer in the Bayin River Basin.By analyzing the annual variation characteristics of groundwater level burial depth and its relationship with the Bayin River runoff,the characteristics of groundwater level change are revealed.Through the correlation analysis between groundwater dynamic monitoring data and runoff,the Bayin River Basin rush is revealed.The correlation between the dynamic monitoring data of the alluvial aquifer and the hydraulic factors;the sensitivity analysis of the parameters shows that the permeability coefficient has a significant impact on the groundwater level fluctuation.?According to the position distribution of the monitoring wells,a suitable research area was selected,and a two-dimensional numerical model of the aquifer plane and section of the Bayin River alluvial fan was established.Based on the data analysis results between the hydraulic elements,the selection of the back analysis data and the algorithm optimization are performed to improve the inversion accuracy.? Based on the hydraulic tomography scanning method,hydrodynamic tomography scanning of the alluvial fan aquifer in the Bayin River Basin was carried out under three different working conditions using groundwater dynamic monitoring data,and the aquifer of the alluvial fan aquifer in the Bayin River Basin was characterized.Geological structure,obtain the spatial distribution of aquifer permeability coefficient.Based on the results of hydraulic tomography scanning,groundwater seepage analysis under various influences such as natural runoff conditions,flood conditions and groundwater exploitation is carried out.The distribution of permeability coefficient obtained by inversion analysis improves the accuracy of groundwater numerical analysis. |
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