首页|Estimation of aquitard hydraulic conductivity and skeletal specific storageconsidering non-Darcy flow

Estimation of aquitard hydraulic conductivity and skeletal specific storageconsidering non-Darcy flow

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Darcy's law has been widely used to study the groundwater drainage process within an aquitard. However, non-Darcy flow is frequentlyencountered in laboratory and in situ investigations. With consideration of a sudden drop in boundary hydraulic heads, aquitard compactioncharacteristics and their sensitivities to the non-Darcy flow control variables were analyzed. The non-Darcy flow was found to retardgroundwater drainage, and the retardation effects were much more significant at early-to-intermediate time points. Under this specific boundarycondition, the timeecompaction curve in a logelog graph at early time points was found to be close to a straight line, whose slope can be used toindirectly evaluate the extent of the non-Darcy effect. A non-Darcy flow-based type curve method was developed for estimating aquitard hydraulic conductivity (K) and skeletal specific storage (Ss), and this method was used to interpret the timeecompaction data recorded in alaboratory experiment. The tested aquitard was determined to be associated with non-Darcy flow due to the fact that the timeecompaction curvedeviated from the Darcy's law-based theoretical curve. Darcy's law resulted in an underestimated K. In contrast, the estimated Ss was almostunaffected by the flow state, if the observation lasted long enough to reach final steady compaction.© 2021 Hohai University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

AquitardNon-Darcy flowParameter estimationLaboratory experiment applicationHydraulic conductivitySkeletal specific storage

Chao Zhuang、Long Yan、Zhi-fang Zhou、Jin-guo Wang、Zhi Dou

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School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, China

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesBasic Research Program (Natural Science Foundation) of Jiangsu ProvinceChina Postdoctoral Science Foundation

2019YFC180430141902244B200202018BK201904972021M690866

2021

水科学与水工程
河海大学

水科学与水工程

CSTPCDCSCDEI
影响因子：0.432
ISSN：1674-2370
年,卷(期)：2021.14(4)
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