多孔介质渗透系数的空间尺度效应研究进展

PROGRESS OF RESEARCH ON THE SPATIAL SCALE EFFECTS OF HYDRAULIC CONDUCTIVITY IN POROUS MEDIA

多孔介质渗透系数的空间尺度问题是一个与地下流体运动和溶质运移的数值模拟密切相关的应用性课题，广泛的应用需求和新的计算方法使其成为近年的热门课题之一。它涉及到相互联系的两个方面：①非均质介质场渗透系数空间尺度行为的分析与模拟；②将局部测量尺度下的试验参数转化为数值模拟网格尺度下的参数输入值的升尺度（ｕｐｓｃａｌｉｎｇ）方法和计算模型。首先介绍了该课题在概念上的拓展及其物理含义，进而以方法为主线，对这一领域具有代表性的研究成果进行了分类和评述，讨论了该课题的研究对地下水流和溶质运移的模拟分析乃至整个多孔介质流体运动研究的意义。

The spatial scale effects of hydraulic conductivity in porous media, which is a applied issue that closely relates to subsurface flow and solute transport,have been widely concerned in recent years because of the application needs and new available calculating technique. It involves two relative aspects: (1)the analysis and modelling for the spatial scale behaviors of heterogeneous porous media; (2) the method and model of upscaling which transforms a hydraulic parameter collected from local test at the scale of the measurements, into a block parameter amenable for input to a numerical flow simulator at a bigger scale.The extension of the concept of the problem and its physical meaning are firstly introduced.Then,concentrating on the different approaches, the typical existing research results about this problem are classified and reviewed. The significant effect on the numerical simulation of groundwater flow and solute transport and the research of fluid dynamics in porous media is also discussed.