Study On The Dynamic Change And Simulation Of Groundwater In Hami Basin

In recent years on the one hand because population increasing, agriculture and industry rapid development result in the increasing of groundwater exploitation and demand year by year; on the other hand, such as the small reservoirs construction, canal seepage control rate continuously improving and efficient water-saving area gradually increasing, those measures reduce the amount of groundwater recharge from surface water. To this new phenomenon-groundwater level declining gradually, excessive extraction groundwater worsening gradually, and groundwater resources reducing continually-the paper analyzes the dynamic changes of groundwater level with GIS, and simulates groundwater flow field change and development based on different groundwater extraction plan. The study proposes groundwater extraction plan keeping groundwater level stable. The research results can provide the scientific basis for the rational development and utilization of groundwater and groundwater level stable in Hami basin.Through the above analysis, the following conclusions are concluded:(1) With the continued over-exploitation groundwater in Hami basin, groundwater level continues to drop. In particular, the past five years (2005-2010), the groundwater level decline rate increases;(2) Based on the situation of the groundwater level decline gradually due to groundwater over-exploitation for Hami basin, expect that2020Hami basin water tables is falling and the water level drawdown is greater than depth of aquifer thickness2/3, and groundwater levels is below the red line;(3) Though different designs of extraction conditions, forecast results show that maintaining the current5.15×108m3/a extraction volume, the water table will continue to decline; extraction volume reduces to4.65×108m3/a,4.15×108m3/a, groundwater levels will continue to decline, and only when the extraction volume further reduces to3.15×108m3/a, slows down,and the annual falling rate of water tables is0.5m below. Therefore, to stop the Hami Basin groundwater drawdown cone further deepening and expansion, groundwater extraction must be controlled to less than3.153×108m3/a. Otherwise, Hami Basin groundwater drawdown cone is further aggravated, facing the risk of water resources depletion.