Analysis And Application Of National Groundwater Monitoring Data

Groundwater monitoring data is not only of great significance for understanding and evaluating the status quo of groundwater,but also provides basic data support for subsequent groundwater management and research work.In 2015,the country initiated the implementation of the national groundwater monitoring project to collect groundwater data across the country.However,due to the relatively short time the monitoring stations have been put into use and the relatively complicated hydrogeological conditions in my country,the data collected in the system are different.As a result,the monitoring data cannot be used directly and cannot be used for groundwater flow field and dynamic analysis.Through the data collection of the national groundwater monitoring data integration theory,this paper takes the plain area of Hebei Province as the research area,analyzes and processes its groundwater level data,and uses it to evaluate groundwater overexploitation,groundwater storage calculations,etc.,to repair groundwater in this research area And management to provide data support.After years of large-scale exploitation of groundwater resources in Hebei Province,the dynamic type of groundwater is mainly exploitation.Some monitoring stations in the province have problems such as long-term lack of monitoring data and sudden increases in groundwater levels.This paper selects 98 water level data of national monitoring stations to integrate them using water level interpolation and regression analysis,and analyzes the sudden increase and decrease of groundwater level based on the actual situation.The integrated water level data is calculated using gridding method to calculate that the shallow groundwater storage variable in the plain south of Beijing-Tianjin in 2019 has been reduced by 7.3×10~8km~3,and the deep groundwater storage variable has been reduced by 3.9×10~8km~3;the shallow groundwater in the study area in 2020 The storage volume has been reduced by 6.4×10~8km~3,and the deep groundwater storage volume has been reduced by 3.1×10~8km~3.At the same time,based on the integrated groundwater level monitoring data,Arc GIS software is used to draw the groundwater flow field map,the groundwater level dynamic map and the falling funnel map of the plain area of Hebei Province.From these maps and data,it can be concluded that the average groundwater depth of the shallow freshwater area of the plain south of Beijing-Tianjin is 29.96 m,the average depth of the groundwater level in the central plain is 12.57 m,and the average depth of the coastal plain is 2.93 m;the mountain south of Beijing-Tianjin The average depth of groundwater level in the former plain is 48.78m,the depth of groundwater level in the central plain is 70.24 m,and the depth of groundwater level in the coastal plain is 69.72 m.The total area of shallow groundwater overexploitation in the plain south of Beijing-Tianjin is about 7815km~2,of which the general overexploitation area is 1563 km~2,and the severely overexploited area is 6252km~2;the deep groundwater overexploitation area in the plain south of Beijing-Tianjin is mainly distributed in the middle.In the plains and coastal plains,the total over-exploitation area is about 46,895 km~2,of which the general over-exploitation area is7815 km~2,and the severe over-exploitation area is 39,080 km~2.At the same time,through a detailed analysis of the groundwater environment in the study area,this article combines the geological conditions of the study area and the human environment to put forward suggestions and methods for the management of areas with serious groundwater overexploitation areas.