阿克苏河流域渗透系数空间变异性分析

为合理评价阿克苏河流域地下水资源,通过野外试验及收集前人研究成果运用传统统计学和地统计学相结合的方法对阿克苏河流域渗透系数进行空间变异性及结构分析。结果表明:阿克苏河流域渗透系数变化潜水比承压水大;潜水含水层渗透系数受外界条件等随机性因素影响较大,承压水受含水层位置、地层岩性等结构性因素影响较大,最优变异函数拟合模型分别为高斯和指数模型;渗透系数南北向变异程度大于东西向,主变异方向为沿着阿克苏河流向;运用克里金插值得出渗透系数总体表现为由北向南逐渐减小,靠近河流处大于远离河流处,并给出潜水和承压水的参数分区及取值范围。该结论为阿克苏地区后期进行地下水资源评价和数值模拟提供了合理可靠的参数选取依据,并对其他地区的渗透系数研究具有借鉴意义。

Spatial Variability Analysis of Permeability Coefficient in Aksu River Basin

In order to evaluate the groundwater resources of Aksu River Basin reasonably,the spatial variability and structural analysis of the permeability coefficient of Aksu River Basin are carried out by using the method of traditional statistics and geostatistics through field test and collection of previous research results.The results show that the variation of permeability coefficient in Aksu River Basin is more than that of confined water;the permeability coefficient of phreatic aquifer is greatly influenced by the randomness factors such as external conditions,and the confined water is greatly influenced by the structural factors such as aquifer location and formation lithology,and the best fitting model of variation function is Gauss and index model respectively;the variation degree of permeability coefficient in north-south direction is greater than that in east-west direction,and the main variation is along the Aksu River.By using Kriging interpolation,the overall performance of permeability coefficient is that it decreases gradually from north to south,the river nearby is larger than far away from the river,and the parameter division and value range of phreatic water and confined water are given.This conclusion provides a reasonable and reliable parameter selection basis for groundwater resource evaluation and numerical simulation in Aksu Area,and can be used as a reference for the study of permeability coefficient in other areas.