Reservoir Capacity Of Karst Groundwater In Shuicheng Basin Of Sancha River Basin,Guizhou Province

Compared with surface water reservoir,groundwater reservoir has attracted more and more attention because of its many advantages.The abundant karst media derived from the widely developed karst landforms in southwestern China have great potential in the storage space and storage capacity of local groundwater.It is of wide scientific and social significance to carry out the study of karst "groundwater reservoir" for the storage capacity of surface water reservoirs.In this paper,Shuicheng area,located in the Sancha River Basin in central Guizhou,is selected as the research area,aiming at quantitatively evaluating the groundwater reservoir capacity(storage capacity)of the area,so as to provide a reference for water resources regulation and storage in the Sancha River Basin.On the basis of collecting a large number of borehole information,hydrogeological reports and related professional documents,this paper uses ArcGIS software to interpolate 33 borehole data to obtain the stratum elevation values of the study area,and builds a three-dimensional geological structure model including Quaternary,Triassic,Permian and Carboniferous in the groundwater simulation software GMS.? After generalizing the study area into an equivalent porous medium model,the source sink and boundary conditions of the area are determined by studying the actual hydrogeological conditions.The initial hydrogeological parameters are given by using the previous empirical values and some formulas.The fitting between the calculated results of the model and the water level data of the monitoring boreholes in the area after trial and error is shown.Reliability of parameters.At the same time,the sensitivity of horizontal permeability coefficient and vertical permeability coefficient is analyzed by factor change method.The results show that the sensitivity of horizontal permeability coefficient is much greater than that of vertical permeability coefficient,and when the ratio of them is about 10,the model can be well fitted.Using the confined water level of each aquifer calculated by GMS,combined with the corresponding roof elevation data and water storage coefficient,the groundwater storage volume in the study area is calculated in ArcGIS software,which is 129-243 million m,and the gravity water volume accounts for more than 90% of the bear storage volume.At the same time,it is found that the spatial distribution of groundwater storage in Triassic and Permian strata is correlated with karst development.The area from Dewu to Loess Slope and east of Shuicheng County Government are the areas with the strongest groundwater storage capacity in the whole stratum.