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为了研究含水层多孔介质参数非均质性,利用一系列连续的交叉孔水力试验获取含水层对于外界干扰的反应信息,应用序贯连续线性估计方法(Sequential Successive Linear Estimator)对多系列水头信息进行随机参数估计,即水力层析法。应用该方法对随机产生参数的一维含水层进行了渗透系数K和储水率Ss的估算,并对估计值和真实值进行了对比,其中使用单井数据计算就可使K值的平均相对误差控制在2.67%,证明了该方法的有效性。在对某地浸采铀厂区长、宽为150m×150m的含水层进行了实例研究,使用29口井孔进行层析试验,对于该二维水平分布含水层的非均质特征进行了刻画,其中K值为0.5~1.4 m/d,Ss为0.00005/m~0.0002/m。该数据在后期的地下水污染溶质运移模拟中取得了很好的应用。作为研究地下水参数的新方法,水力层析法能够对三维分布的含水层特征进行高精度刻画,这种层析的概念和反演方法可广泛应用于环境和地球科学领域的研究。
In order to study the heterogeneity of porous media parameters in aquifers, a series of continuous cross-hole hydraulic tests were used to obtain the response information of aquifers to external disturbances. Sequential Successive Linear Estimator (Sequential Successive Linear Estimator) Random parameter estimation, ie hydrometry. This method is used to estimate the permeability coefficient K and the water storage rate Ss of a one-dimensional aquifer with randomly generated parameters. The estimated value and the true value are compared. The calculation of single well data can make the average of the K value relative The error is controlled at 2.67%, which proves the effectiveness of this method. A case study was conducted on an aquifer with a width of 150m × 150m, which is the head of a dipping uranium plant in a groundwater immersion mining project. Twenty-nine boreholes were used for the chromatographic analysis. The heterogeneity of the two-dimensional horizontal aquifer was characterized, K value of which is 0.5 ~ 1.4 m / d, Ss of 0.00005 / m ~ 0.0002 / m. The data obtained in the late simulation of groundwater pollution solute transport has made good use of. As a new method of studying groundwater parameters, hydromechanics can describe the characteristics of three-dimensionally distributed aquifers with high accuracy. The concept and inversion method of such tomography can be widely applied in the fields of environment and earth science.