Transport modeling in heterogeneous aquifers: 1. Statistical description and numerical generation of gravel deposits
Transport modeling in heterogeneous aquifers: 1. Statistical description and numerical generation of gravel deposits
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DOI：
10.1029/94wr00162
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发表时间：
1994-06
影响因子：
5.4
通讯作者：
P. Jussel;F. Stauffer;T. Dracos
中科院分区：
文献类型：
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作者：
P. Jussel;F. Stauffer;T. Dracos
地下水中溶质的迁移受到含水层非均质性的决定性影响。目前工作的目标是基于砾石含水层异质性的统计描述，数值生成合成异质含水层模型。在此背景下，对瑞士东北部几个砾石坑中的大型未风化露头进行了调查。在沉积学观察的基础上，可以指定表现为透镜体或层状的不同沉积结构。每个调查的露头中的所有结构均已被识别。通过检查和分析露头的照片，可以估计沉积结构几何属性的概率密度函数（pdf）。从这些结构中采集受扰动和未受扰动的样本，以估计其水力特性的 pdf，即水力传导率和孔隙率。所获得的信息用于通过对合成含水层进行无条件随机模拟来生成不同的数值结果，该含水层在导水率和孔隙率方面与所研究的沉积物具有相同的统计特性。
Transport of solutes in groundwater is decisively influenced by the heterogeneity of the aquifer. The goal of the present work is the numerical generation of synthetic heterogeneous aquifer models based on a statistical description of heterogeneities in gravel aquifers. Large unweathered outcrops in several gravel pits in northeastern Switzerland were investigated in this context. On the basis of sedimentological observations it was possible to specify distinct sedimentary structures appearing as lenses or layers. All structures have been identified in each of the investigated outcrops. By inspecting and analyzing photographs of the outcrops, it was possible to estimate the probability density functions (pdf) of the geometrical attributes of the sedimentary structures. Disturbed and undisturbed samples were taken from these structures to estimate the pdf of their hydraulic properties, that is, the hydraulic conductivity and the porosity. The information obtained is used to generate distinct numerical realizations by unconditional stochastic simulation of synthetic aquifers having the same statistical properties with respect to hydraulic conductivity and porosity as the investigated deposits.