摘要
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。
The object of this study is to evaluate the spatial distribution of hydraulic conductivity in the third confined aquifer of Shanghai City. The hydraulic conductivity is considered as a regionalized variable. Then the structure of spatial variation could be established by using the GSLIB software to calculate the theoretical variogram of experimental data for generating the variogram model of spatial directions. After cross validation, ordinary Kriging analysis was provided to expand the spatial variation of hydraulic conductivity and reflect the anisotropic variability in contour map. Results showed that the log of hydraulic conductivity has strongly anisotropic variability and illustrated the minimum variation along the N30°E direction and the maximum variation along the E30°S direction. The anisotropic of topography in such area is controlled by its hydrogeology factor while aquifer was forming.
出处
《工程勘察》
CSCD
北大核心
2009年第1期36-41,共6页
Geotechnical Investigation & Surveying
基金
国家自然科学基金(批准号40702037)
南京大学人才引进科研启动基金项目资助
