Research On Response Characteristics Of Groundwater Level Dynamic Intervention Of Dongfeng Lake In She County

With economic development,the demand for water resources has increased,and groundwater has been pumped excessively,leading to a series of environmental and geological problems such as a large-area drop in groundwater level,the formation of a falling funnel,and the deterioration of water quality.The dynamic change characteristics of groundwater are an important basis for controlling groundwater resources overexploitation,scientific evaluation of groundwater resources and related geological disasters and ecological environment.Dongfeng Lake spring area in the study area is the main source of water supply in Shexian County.For many years,social and economic development,unreasonable mining and waste have caused karst groundwater to be over-exploited for a long time.This paper aims to analyze the dynamic response characteristics of the groundwater pressure in the Dongfeng Lake spring area in Shexian County.Firstly,using the existing hydrogeology and groundwater level monitoring data in the spring area,the karst groundwater dynamic types,temporal and spatial changes and influencing factors were analyzed;Secondly,using GMS software to establish a groundwater flow numerical model in this area,predicting the evolution of karst groundwater under artificial pressure mining conditions in the next 10 years;Finally,the dynamic response characteristics of groundwater in the study area under different pressure mining conditions are analyzed.The research results show that the dynamic types of groundwater in the Dongfeng Lake spring area are mainly: precipitation infiltration-exploitation type,and the groundwater level gradually changes from being affected by precipitation to atmospheric precipitation and artificial exploitation.The groundwater level in the study area showed an overall upward trend from 2007 to 2016.From 2007 to 2010,the groundwater level in most areas has declined,mainly due to mining;After 2010,due to the small increase in mining volume and the increase in precipitation,the groundwater level is generally on the rise;In 2016,the amount of precipitation in the study area increased sharply,the amount of groundwater extraction decreased accordingly,and the groundwater level rose significantly.In the forecast phase,from 2020 to 2024,10% and 20% of the current groundwater extraction will be extracted.The multi-year average variation of the groundwater level will be-0.061 m and 0.368 m,respectively.In 2024,the groundwaterlevel will increase by 1.75 m and 1.91 m respectively from the current year;From 2025 to2029,on the basis of 20% of the recent compression mining,continue to compress the production by 10%,and the groundwater level will increase by an average of 0.20 m for many years.In 2029,the groundwater level will increase by 3.06 m compared with the current year.From a spatial point of view,under the conditions of human intervention,the groundwater level gradually increases from west to east to south to north.The area with a larger variation is located in the east of Dongfeng Lake spring area.Divided by administrative divisions,mainly Piandian Town,Jingdian Town and Shecheng;Piancheng Town,Suobao Town,Liaocheng Township,and Dongfeng Lake Springs outcropping areas are still experiencing negative growth,after the long-term implementation of pressure extraction measures,the falling funnel tends to shrink.