水源地裂隙含水层水文地质参数的确定

Determination of Hydrogeological Parameters in Fissured Aquifer of a Water Source Field

含水层水文地质参数的确定对于了解地下水运动特征和计算地下水资源量十分重要,抽水试验法则是确定含水层参数的主要方法。通过在水源地现场进行1次非稳定流抽水试验和2次稳定流抽水试验,在Aquifer Test软件的支持下,采用多种数学模型计算并确定研究区裂隙含水层的相关水文地质参数。计算结果显示:含水层的渗透系数表现出各向异性,垂直地下水流向的渗透系数大于平行地下水流向的渗透系数,其数值分别为25.81m/d和17.51m/d;弹性释水系数远小于给水度,分别为0.000 378和0.145,因此在水资源评价过程中可忽略含水层的弹性释水量。

The determination of hydrogeological parameters of the aquifer is very important for understanding the characteristics of groundwater movement and calculating the amount of groundwater resources. The pumping test is the main method to determine the parameters. One unsteady flow pumping test and two stable flow pumping tests are conducted at a water source field. Under the support of Aquifer Test Software, using a variety of mathematical models, the hydrogeologieal parameters of a fissured aquifer in the study area are calculated and determined. The calculation results show that： the hydraulic conductivity of the aquifer shows the anisotropy the hydraulic conductivity of the vertical direction of groundwater flow is greater than the value of the parallel direction of groundwater flow, which is 25.81 m/d and 17. 51 m/d, respectively; the elastic storage coefficient is much smaller than the specific yield, which is 0. 000 378 and 0. 145, respectively, so the elasticity release amount of the aquifer water can be ignored in the water resources evaluation process.