Numerical Simulation of Groundwater Flow and Evaluation of Groundwater Resources in Gasikule Lake Basin,Western Margin of Qaidam Basin
The Gasikule Lake Basin is located in Mangya City,an administrative region where large-scale centralized water source projects have not been constructed since its establishment as a city.Within the framework of basing municipal production and urban development on water resources,the evaluation of underground water resources and extraction potential is crucial.This article evaluates the natural groundwater resources and permissible extraction volume within the area,as well as assesses the impact of groundwater extraction on the hydrological environment.The assessment is based on data collection,dynamic observations,pumping tests,and numerical simulations at the basin scale,combining the cross-section radial flow method.The results indicate that the volume of natural groundwater resources in the Gasikule Lake Basin is 98.82×104 m3/d,with a permissible extraction volume of 23.5×104 m3/d.The underground water extraction coefficient is less than 0.4,signifying a low extraction level.Following stable extraction,downstream spring water decreases by 10.89×104 m3/d,while evaporation volume decreases by 12.88×104 m3/d.The total extraction volume equals the sum of the reduced volume of spring water and reduced volume caused by evaporation.Indirectly,the extraction of groundwater depletes ineffective evaporation and a portion of spring water.The depth of wetland areas decreases by≤0.5 m,without degradation of wetland area.The inflow into the Gasikule Lake decreases by 2.53×104 m3/d,but it can maintain a positive ecological cycle around the lake and wetlands.
Western margin of Qaidam BasinGasikule Lake BasinAllowable exploitation of groundwa-terNumerical simulation
NETL
NSTL
万方数据
维普
