Monitoring And Analysis Of Temporal And Spatial Variation Of Groundwater Reserves In Guanzhong Area

In recent years,"groundwater over-exploitation" and "water pollution" and other groundwater crisis gradually emerged,so for the monitoring and research of groundwater resources is particularly important.In this paper,the Guanzhong Plain area,which is located in the northwest China's urban agglomeration,is used as the research area,the joint multi?source GNSS,groundwater data,the satellite gravity field and its determined continental water equivalent water height change as the reference field,Based on the theory of Earth load elastic deformation,this paper removed the tidal effects(polar tide,solid tide,half day and Sunday atmospheric tide load)and soil water from the vertical deformation of CORS station,The results show that the change of groundwater reserves in Guanzhong City can be carried out by using the method of earth load deformation and the combination of earth gravity field.The monitoring and analysis of the temporal and spatial changes of groundwater reserves in Guanzhong urban agglomeration are realized.The main results of this paper are as follows:(1)This paper uses a variety of data,one of the most critical regional CORS station overall data is good,the data cycle is obvious,the site of the earth high value range of-40-40mm;through various types of data calculated from the regional year The average atmospheric admittance range ranged from-1.9 to 0.7,and the change in atmospheric pressure on the vertical phase of the CORS station was in the range of-20 to 20 mm.The low frequency parameters were calculated between-10 and 10 mm.(2)The joint solution of the groundwater changes in the region,found that the regional groundwater reserves change in the value of-1.2m-0.9m;(2)from 2011 to 2016 in the first half of the overall change is not large;(3)groundwater reserves change regional,In the northwest of Shaanxi and Ningxia in the eastern part of the groundwater reserves decreased significantly,compared to June 2011 the value of the reduction of up to 1.2m,while the eastern part of Gansu,and Shaanxi and Ningxia junction area increased groundwater reserves more obvious,relative to June 2011 increased up to 0.9m The Through the calculation of the average annual change of water reserves,it is found that the change of groundwater reserves in the urban agglomeration is generally stable in recent years,and the decline rate is about 2cm / y in some areas.Monitoring the changes in groundwater reserves in Guanzhong Plain,and monitoring the deformation of its long-term sequence,grasping the status of groundwater reserves,and exploring the causes of changes in groundwater reserves in depth.This will help the relevant government departments to plan and develop disaster prevention and mitigation Programs and decision-making to provide certain information,with a certain degree of scientific research and practical value.