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本文采用地质统计方法分析上海第三承压含水层渗透系数的空间变异性。将取对数后的渗透系数作为区域化变量,计算各个方向的试验变差函数,进行理论变差函数模型拟合,以分析含水层空间结构并判定含水层可能的各向异性。变差函数模型经交互验证后,再采用普通Kriging法进行空间插值获得该含水层的渗透系数空间分布。研究结果表明:对数渗透系数在空间上具有明显的几何各向异性,大约在北偏东30°方向有最小的变异性,而在东偏南30°方向具有最大的变异性,这与含水层形成的水文地质环境具有密切关系。
In this paper, the geostatistical method is used to analyze the spatial variability of the permeability coefficient of the third confined aquifer in Shanghai. Taking the logarithm of the permeability coefficient as a regionalized variable, the experimental variation function in each direction is calculated, and the theoretical variation function model is fitted to analyze the spatial structure of the aquifer and determine the possible anisotropy of the aquifer. After the variogram model was validated interactively, the spatial distribution of the permeability coefficient of the aquifer was obtained by using the common Kriging method. The results show that the logarithmic permeability coefficient has obvious geometric anisotropy spatially, which shows the smallest variability in the direction of 30 ° North East and the largest variability in the direction of 30 ° East South, The formation of hydrogeological environment is closely related.