群井开采条件下承压含水层渗流动态模拟

Simulation of Groundwater Movement in Confined Aquifer under Multi-well Exploitation

根据有限差分方法 ,编制了承压含水层渗流模拟软件。对某水源地在群井开采情况下地下水渗流动态进行数值模拟。模拟结果显示 ,位于高渗区的井 ,压降漏斗较其它井大 ,压力下降快。当地层中存在裂隙时 ,平行裂隙方向压力下降比垂直裂隙方向要快得多。抽水初期 ,地层压力下降很快 ,以后 ,压力下降逐渐变缓 ,位于低渗透区的井逐渐不能满足流量要求。

A software of simulating water movement in confined aquifer was developed with finite different method. By using the software, dynamic changes of water head of a confined aquifer under multi well exploitation were simulated. The simulated results showed that pressure in high permeability aquifer declined more rapidly than in low permeability under fixed discharge. However, the extent of pressure declining funnel expands gradually with time, and groundwater discharge rate for wells located in low permeability areas declines rapidly. Where fissures exist in reservoir, the pressure declines rapidly along the fissures. Therefore, it is very important to set down a suitable regional water resources development plan.