潜水自然防护性能的评价及效果分析

EVALUATION OF NATURAL PROTECTED FUNCTION OF PHREATIC WATER AND THE ANALYSIS ON EFFECTIVENESS

本文以大量的水文地质勘探结果为依据,引用了水文地质参数:隔、透水层的厚度(A、B)和渗透系数(K_1、K_2)。对研究区非饱和带进行统计计算,求出该带的垂直自然防护性能指数。同时选择饱和带特征参数导水系数(T),计算出潜水自然防护性能总指数后,对潜水自然防护性能进行评价。

The natural protected function should include the behaviour of saturated and non-saturated zones as a whole hydrogeological body. Based on the lithological characters, texture,petmeability of the non-saturatedzone and the dilution capacity for pollutant of phreatic water in the saturated zone, the authors made a lot of statistics in this studied area, and carried out a comprehensive evaluation for natural protected function of phreatie water by the following ways: 1) According to the seepage coefficient(K)of the rocks and strata, the relative permeable layer and the water resisting layer in the non-saturn ed zone can be divided; 2) By using 'dimensionless index method', the vet icle protec ion index for non-saturated zone was calculated; 3) The transmission coefficient (T) of water indicates the self-purification capacity of natural dilution of the saturated zone, so the value T was joined to the calculaion of the natural protection index of the phreatic water; 4) According to the natural protec ion index of the phreatic water, the evaluation for the divisions of the natural protected runction of the phreatic water was made.