Analysis on Dynamics Characteristics of Groundwater in Gongyi City

To understand the dynamic of groundwater table in Gongyi City,provide some basis for the groundwater resources in Gongyi City,and achieve the high-efficient use of groundwater resources,the monitoring points of groundwater table were laid in the urban area of Gongyi City. Based on the monitoring datum of monitoring points of groundwater table in nearly 3 years,we analyzed the influence of the annual and inter-annual precipitation on the dynamic of groundwater table,the depth to groundwater table and the change trend of groundwater drawdown funnel. The results show: in the research area,the depth to groundwater table is shallower,the precipitation is the main influence factor of the dynamic fluctuation of groundwater table; the annual fluctuation of groundwater table is mainly the seasonal fluctuation,the inter-annual groundwater table is in a state of dynamic balance; the aquifer of confined water is the main supply source of the research area,but the long-term excessive mining results in larger groundwater drawdown funnels; under the condition of limit mining,the groundwater drawdown funnel will keep stable,and the groundwater will basically realize the balance between mining and recharging.