Evaluation And Research Of Groundwater Resources In Yushu City Of Jilin Province

Yushu city is one of the important commodity grain bases in China.Groundwater is the main source of water supply.With the extensive economic development of elm city,the demand for water resources is increasing year by year,the exploitation of groundwater is also increasing.The extensive discharge of industrial and living waste water,and the abuse of pesticide and chemical fertilizer,have caused a series of problems such as water environment pollution of groundwater and the funnel of groundwater landing.Therefore,this paper evaluates the groundwater resources in Yushu city from the perspective of quantity and quality,and analyzes the current situation and problems of the utilization of groundwater resources,and on this basis,it puts forward reasonable suggestions for the scientific management and rational utilization of the groundwater resources in Yushu city.In this paper,the water quality of Yushu city is evaluated by single index evaluation method and projection pursuit evaluation model.The results show that the sampling point of the water quality of Yushu city is 76.9%of the total sampling point.It shows that the water quality of the city is better and the local water quality is grade IV,the main reason is that some industrial parks are in the industrial park.The discharge of factory wastewater and domestic sewage resulted in excessive Fe,NO₂^-,NH₄⁺and coliform bacteria in underground water.Then according to the data of meteorology,hydrology,hydrogeology and pumping test in the study area,the numerical model of groundwater flow is established by using Visual Modflow software,and the fitting degree of the calculation value of the water level given by the dynamic observation value of the groundwater level and the model is taken as the index,and the model is identified and verified through repeated adjustment of parameters,the fitting degree of the model is optimal.Based on the established numerical model,the groundwater resources of the study area are evaluated by the regional water balance module in the software,and the water balance method is used to verify the groundwater resources.The results show that the groundwater resources in Yushu city are in a positive equilibrium state.The maximum recoverable amount calculated by the water balance method is slightly larger.In order to ensure the exploitation of the groundwater resources and the sustainable utilization,the annual maximum recoverable resources of the water resources in Yushu city are 2.82×10⁸m/a.On the basis of the previous analysis,the present situation and existing problems of the utilization of groundwater resources in this city are analyzed,and the subarea of groundwater resource utilization is put forward.At the same time,the management and protection of the groundwater resources in Yushu city should be strengthened,and the water resources in the region should be properly allocated.