应用水力层析法刻画含水层非均质性  

Characterization of aquifer heterogeneity by using hydraulic tomography

作　　者：董艳辉[1] 李国敏[1] 赵春虎[2] 叶善东 

机构地区：[1]中国科学院地质与地球物理研究所,北京100029 [2]煤炭科学研究总院西安研究院,西安710054 [3]新疆中核天山铀业公司,新疆伊犁835000

出　　处：《工程勘察》2009年第12期58-61,69,共5页Geotechnical Investigation & Surveying

基　　金：环保公益性行业科研专项(200709055);中国科学院知识创新工程重要方向项目(kzcx2-yw-116kzcx2-yw-126-04)

摘　　要：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。The hydraulic tomography is proposed to survey spatial distributions of aquifer properties. The said method uses a series of cross-well interference tests to monitor the aquifer＇s response and employ sequential successive linear estimator to interpret data from tomography. The one hypothetical, one-dimensional, horizontal, heterogeneous, confined aquifer was used to test the inverse approach, in which hydraulic conductivity K and specific storage S6 were estimated. The estimates were compared with those from fields, just a 2.67 % average relative error for K field using data from one injection process. The comparisons indicate that the method could produce accurate estimate for all parameter fields. A case study was conducted in an in-situ leaching uranium mining area, using 29 wells in a domain of 150m×150m. The results show that K field is in the range of 0.5m/ d—1.4m/d and 0.00005/m—0.0002/m for Ss. The hydraulic tomography is potentially a viable tool for high-resolution characterization of subsurface heterogeneity and contamination, and the tomagraphy concept could be widely used to the research in environmental science and geoscienees.

关 键 词：含水层非均质性 层析法 参数估计 地下水流动 

分 类 号：P641.2[天文地球—地质矿产勘探]