多层含水层系统水文地质参数计算

The Calculation of Hydrogeological Parameters of Multilayer Aquifer System

为求取含水层水文地质参数,常用的试验方法是抽水试验。在进行抽水试验时,经常有越流现象,计算时一般采用越流模型计算。越流模型假定非抽水含水层的水位恒定不变,但在实际抽水过程中,抽水含水层和非抽水含水层间通过越流相互影响、相互作用。如果只考虑抽水含水层的水位变化而不考虑非抽水含水层的水位变化,会导致计算的水文地质参数不准确。实际工作中,有时会在非抽水含水层中布置一口观测井来观测抽水含水层抽水时对非抽水含水层的影响。如果采用多层含水层系统模型的方法,即可利用各含水层观测井中的数据计算出每个含水层和相关弱透水层的水文地质参数,提高参数计算精度、节省资金和工作量。

Pumping test is a common test method for hydrogeological parameters of aquifers.The leakage often occurs in a pumping test.The leaky model assumes that the water levels of the non-pumped aquifers are constant in calculation.But the water levels of the non-pumped and pumped aquifers are always influence with each other through the leakage.If the changes of water levels in non-pumped aquifers are not considered,the hydrogeological parameters will not be correct.Sometimes an observation well is screened in the non-pumped aquifer.If the multi-layer aquifers system model is used,the hydrogeological parameters of each aquifer and leaky aquifer can be calculated by using the data from the observation wells.It can improve the accuracy of parameter,save money and workload.