Research On The Groundwater Optimization Mining Technology In North Of Weifang Area

Groundwater is an important part of scarce resources.The disorderly and excessive exploitation of groundwater will cause serious environmental geological problems.The reasonable exploitation and utilization of groundwater is directly related to the harmonious development of man and nature.With the improvement of the national economy and human activities,the exploitation of Weifang groundwater resources increased year by year,which caused the drawdown funnel and water quality deterioration.Therefore,established a groundwater flow numerical model about the north area of Weifang and then optimized the groundwater exploitation plan.It can make the limited groundwater resources in the north of Weifang play a biggest role in social development and economic construction.The main contents of this paper and the results are as follows:(1)This paper is studied by collecting Weifang north area of geological,meteorological,hydrological and production water data to analysis the study area hydrogeological conditions.According to the water level observation data of 163 wells,it found that Weifang has plenty of exploitation in above quota of groundwater in the northern area since 1980.The underground water level continues to drop dramatically.In the exploitation area,the average buried depth of ground water level from 5.39 m in 1980 fell to 21.31 m in 2016.It is a cumulative drop of 15.92 m and the annual average drop of 0.44 m.Based on the water quality monitoring data and the Shu Card Lev taxonomy,the study area hydrochemical type from south to north respectively HCO3,HCO3·Cl and Cl water type.(2)In this paper,the groundwater flow numerical model of Weifang north area is established by using Visual Modflow 4.2 software.After the identify and tested,the final simulation results are convergence.This suggests that the fitting degree of model head is better and the established model can reflect the real groundwater flow field in the north of Weifang area.(3)In this paper,the groundwater management model is established by using the optimization algorithms technology.Based on the multiple constraints,threegroundwater exploitation projects were designed.The projects were reduce exploitation or close the self-prepare well,regularly recharge and adjust the distribution of drilling wells.By comparing the three different schemes of exploitation in total,it is concluded that maintain the current mining level of 418.5126 million m3/a,the underground water level will continue to fall.Only when the exploitation further cuts to 349.2966 million m3/a,the underground water levels fall in a drop below 0.5m.To stop the further deepening and extension of north Weifang groundwater drawdown funnel,the annual average groundwater exploitation must be controlled under 356.7558 million m3.