应用水化学动力学法计算磐石地下水系统渗透系数

Attempt to Use the Theory of Hydrochemical Dynamics to Calculate the Permeability Coefficient of Panshi’s Groundwater System

应用水化学动力学法求水文地质参数是将化学热力学、化学动力学与地下水动力学理论相结合．计算水中矿物的离子活度嘶和饱和指数β1，建立渗透系数(K)与α、β1，之间的数学关系式，并结合水文地质条件，求渗透系数(K)。磐石市地下水中Ca^2+、Mg^2+、SO4^2-和Cl-活度及其相应矿物方解石、白云石、石膏和石盐的饱和指数的变化趋势与渗流场特征一致。将计算区划分成6个区,计算出α、β1，及化学反应速率常数k1，求得各分区的K值。计算区K值变化在10．78～26．91m／d之间．与抽水试验法求得的渗透系数值吻合良好。利用水化学动力学法计算水文地质参数不但可以弥补局部地区由于缺乏抽水试验资料而难以确定水文地质参数的困难,同时可减少抽水试验工作．获得可现的经济效益。

Based on the theories of chemical thermodynamics , hydrochemical dynamics and groundwater dynamics, using the method of chemical dynamics to calculate parameters, the ionic activity(α_ i ) and the saturation index(β_ j ) of minerals, then establish the mathematic relation of permeability coefficient(K)andα_ i 、β_ j , combine hydrogeologic condition to calculate K. In the groundwater of Panshi, the trends which between the ionic activity of Ca 2+ 、Mg 2+ 、SO 2- _ 4 、Cl - and the saturation index of calcite, dolomite, gypsum, halite have coincident characters with seepage flow. In order to calculate α_ i 、β_ j and chemical reaction's rate constant and calculate K in each subzone, the authors divide the area into six parts. K varies between 10.78 m/d and 26.91 m/d ,it anastomoses with pumping test's result. The method of using chemical dynamics to calculate parameters not only can cover the difficulties of defining parameters for lacking the pumping test's datas in partial area, but also can reduce the amount of pumping test's work and obtain considerable economic performance.