Groundwater Numerical Simulation and Its Changing Trend in Baicheng City,Jilin Province

This paper used the groundwater modeling method to predict the changing trend of groundwater level in Baicheng City,which will provide scientific proofs for reasonable groundwater development.Firstly,based on analysis of the regional hydrogeological conditions of the study area,a conceptual model of groundwater system in Baicheng City was built,in which the aquifer system was simplified into the unconfined aquifer,the leaky aquifer and the confined aquifer,and the boundary conditions as well as the main source terms were determined.And then,the groundwater system was numerically simulated and predicted with the international standard software GMS.The prediction results showed that the groundwater level in the unconfined aquifer fell by 1-2 m under the condition of expanding exploitation.With increasing of the exploitation volume and time,the aquifer dried up at the fan-shaped area of Tao'er River,Taonan,the northeast of the study area,Zhenlai and the south of Da'an,with the maximum drawdown up to 5-6 m.The groundwater level in the confined aquifer dropped greatly at the south of Da'an and the north of Zhenlai,with the drawdown less than 0.5 m in general.Lastly,the paper proposed the corresponding suggestions for reasonable development of groundwater resources in the study area.