Study On Groundwater Level Dynamics And Intervention Response Characteristics In Shijiazhuang Area

Shijiazhuang area is a typical resource-type water shortage area.The rapid economic development has increased the demand for water resources.The limited surface water resources lead to strong dependence on groundwater for production and life.Groundwater overexploitation has been in a serious state,and geological environmental problems have become more and more hidden dangers.At the end of2014,the central line of the South-to-North Water Diversion Project worked formally,which effectively promoted the implementation of the underground water pressure mining policy in Shijiazhuang,and was helpful for Hutuo River basin ecological replenishment.In this paper,I collect data from many years of groundwater level monitoring and geological environment in Shijiazhuang area,analyze the data with Excel software,study the dynamic characteristics of groundwater level,and establish a numerical model of groundwater flow in Shijiazhuang area by using the MODFLOW module in GMS software.The model was identified and validated by the groundwater data measured and investigated from June 2010 to May 2017,and the response characteristics of groundwater level were predicted.The groundwater recharge in the research area is reduced,and the annual mining volume is still relatively large.The main groundwater dynamic types in the research area are precipitation infiltration recharge-agricultural extraction type,runoff recharge-industrial extraction type and so on.The reason why the groundwater level continues to decline for many years is that the increasing amount of groundwater mining.Three kinds of intervention methods are used to study the dynamic changes of groundwater.The results are as follows:Since 2018,the annual water recharge of the Hutuo River has been 6.5×10~8m~3.It is expected that the water level along the coast will increase by 2.8~5.3m by June 2025,and the best effect of water storage in the aquifer;When the water source of the Hutuo River decreases by3,000m~3 per day,the nearby groundwater level will rebound by 1.5~2.5m by June2025;In the case of two intervention conditions,it can be seen from the overall groundwater flow field that the local shallow groundwater level will increase by2.7~6.2m,and the deep groundwater level will increase by 2.3~4.1m,which is conducive to improving the groundwater environment.