Experimental assessment of solute dispersion in stratified porous media

IF 0.6 Q4 WATER RESOURCES

Hydrological Research Letters Pub Date : 2020-01-01 DOI:10.3178/hrl.14.123

T. Kurasawa, Mariko Suzuki, Kazuya Inoue

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引用次数: 4

Abstract

: The objective of this paper is to evaluate effects of strati‐ fied porous formation on solute dispersion using two-dimensional laboratory tracer tests. An image analysis tech‐ nique was used to analyze the solute dispersion processes and quantify the dispersivity and behaviors of forward and backward tails of solute plumes. Longitudinal dispersivity estimates for the stratified porous media increased with travel distance and are in reasonable agreement with previ‐ ous work. Moreover, in all of the stratified cases the trans‐ verse dispersivity exhibited a similar trend which decayed with travel distance. The summary of dispersivities esti‐ mated from this study and previous studies suggests that if both degree of heterogeneity and scale for stratified and randomly heterogeneous porous media are similar, the lon‐ gitudinal dispersivity is larger in stratified media than in randomly heterogeneous media. In order to quantify behav‐ iors of forward and backward tails, we defined the travel distances x 05 and x 95 corresponding to the 5th and 95th per‐ centiles, respectively, of the cumulative concentrations in the longitudinal direction, and found that the distance between x 05 and x 95 spread out linearly in the stratified cases.

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层状多孔介质中溶质分散的实验评价

本文的目的是利用二维实验室示踪剂测试来评价层状多孔地层对溶质分散的影响。利用图像分析技术分析了溶质弥散过程，量化了溶质羽流前后尾的弥散度和行为。分层多孔介质的纵向色散估计值随着移动距离的增加而增加，并且与以前的工作基本一致。此外，在所有分层情况下，横向色散都表现出相似的趋势，随传播距离的增加而衰减。本研究和以往研究对分散性的总结表明，如果分层和随机非均质多孔介质的非均质程度和规模相似，分层介质的纵向分散性大于随机非均质介质。为了量化前尾和后尾的行为，我们定义了x 05和x 95的行进距离，分别对应于纵向累积浓度的每百分位数的第5和第95，并发现x 05和x 95之间的距离在分层情况下呈线性分布。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Hydrological Research Letters WATER RESOURCES-

CiteScore

1.90

自引率

18.20%

发文量

审稿时长

10 weeks

期刊介绍： Hydrological Research Letters (HRL) is an international and trans-disciplinary electronic online journal published jointly by Japan Society of Hydrology and Water Resources (JSHWR), Japanese Association of Groundwater Hydrology (JAGH), Japanese Association of Hydrological Sciences (JAHS), and Japanese Society of Physical Hydrology (JSPH), aiming at rapid exchange and outgoing of information in these fields. The purpose is to disseminate original research findings and develop debates on a wide range of investigations on hydrology and water resources to researchers, students and the public. It also publishes reviews of various fields on hydrology and water resources and other information of interest to scientists to encourage communication and utilization of the published results. The editors welcome contributions from authors throughout the world. The decision on acceptance of a submitted manuscript is made by the journal editors on the basis of suitability of subject matter to the scope of the journal, originality of the contribution, potential impacts on societies and scientific merit. Manuscripts submitted to HRL may cover all aspects of hydrology and water resources, including research on physical and biological sciences, engineering, and social and political sciences from the aspects of hydrology and water resources.