Study On Dynamic Evaluation Model And System Of Groundwater Pressure Extraction Effect In Xingtai City

Groundwater is an important part of water resources.The current overexploitation of groundwater has caused ecological and environmental problems such as land subsidence and seawater intrusion,which restrict the sustainable development of water resources.In recent years,the state has attached great importance to the comprehensive management of groundwater overexploitation,the formulation of compression mining measures,and the evaluation of compression extraction effects.The study takes Xingtai city,a key area for comprehensive management of groundwater overexploitation,as the research area.On the basis of analyzing the characteristics of groundwater changes and its influencing factors over the years,a groundwater numerical simulation model based on Groundwater Modeling System is constructed,and groundwater depth changes are simulated according to influencing factors and scenario settings.The groundwater depth dynamic assessment system is developed using information technologies such as databases,components,and visual simulation.Based on the system,the process of groundwater assessment process and visualization are realized,providing technical support and decision support for comprehensive groundwater management.The main research results obtained in this paper are as follows:(1)The characteristics and influencing factors of groundwater changes in Xingtai city are analyzed.Kriging spatial interpolation,trend test,mathematical statistics and other methods are used to analyze the characteristics of groundwater changes in the study area,and multiple linear regression,gray correlation,Random Forest and other methods are used to analyze the main influencing factors of groundwater depth changes.The results show that the groundwater in Xingtai city has a general trend of deeper burial depth in the northwest and shallower burial depth in the southeast.June is the deepest period of groundwater burial depth.The burial depth rises from July to September,and the burial depth is stable from October to December.The main factors affecting the change of groundwater depth are rainfall and groundwater extraction.(2)The groundwater numerical simulation model of Xingtai city based on GMS was established.Based on the GMS software,the paper generalizes the boundary conditions,source and sink terms and parameter processing of the study area.After model initialization and parameter calibration,a model with better fitting effect is obtained.Based on the verified model,the groundwater depth changes under the influence of multiple factors from 2021 to 2030 are simulated,and the groundwater depth changes under the two mining options of stable mining and comprehensive management are analyzed.The results show that the groundwater depth is generally on the rise.In 2021,the groundwater depth in Xingtai city will rise by 3.86m on average.In 2030,the groundwater depth will be reduced if the mining volume is maintained at 12.815 billion m3.The stable mining will lead to a continuous decrease in the depth of groundwater,while the implementation of water diversion and pressure mining and other control measures will show a trend of recovery.(3)The dynamic evaluation system of groundwater depth was developed in Xingtai city.Using database technology,spatial interpolation and visual simulation,etc.,a dynamic evaluation system of groundwater depth was constructed,and the system was applied in Xingtai city as the research area to realize the dynamic evaluation of groundwater depth changes and target variation scoring based on the numerical simulation model.Taking 2018 as an example to evaluate the changes in groundwater depth in Xingtai city,the results show that the actual buried depth variation in Xingtai city is less than the target variation,and the evaluation result is excellent,the compression mining target is reached.