Volume 14 Issue 4
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Chao Zhuang, Long Yan, Zhi-fang Zhou, Jin-guo Wang, Zhi Dou. 2021: Estimation of aquitard hydraulic conductivity and skeletal specific storage considering non-Darcy flow. Water Science and Engineering, 14(4): 269-276. doi: 10.1016/j.wse.2021.09.003
Citation: Chao Zhuang, Long Yan, Zhi-fang Zhou, Jin-guo Wang, Zhi Dou. 2021: Estimation of aquitard hydraulic conductivity and skeletal specific storage considering non-Darcy flow. Water Science and Engineering, 14(4): 269-276. doi: 10.1016/j.wse.2021.09.003
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Estimation of aquitard hydraulic conductivity and skeletal specific storage considering non-Darcy flow

doi: 10.1016/j.wse.2021.09.003

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

Funds:

This work was supported by the National Key Research and Development Program of China (Grant No. 2019YFC1804301), the National Natural Science Foundation of China (Grant No. 41902244), the Fundamental Research Funds for the Central Universities (Grant No. B200202018), the Basic Research Program (Natural Science Foundation) of Jiangsu Province (Grant No. BK20190497), and the China Postdoctoral Science Foundation (Grant No. 2021M690866).

  • Received Date: 2020-10-30
  • Accepted Date: 2021-06-08
    • Available Online: 2021-12-15
    Abstract
  • Darcy's law has been widely used to study the groundwater drainage process within an aquitard. However, non-Darcy flow is frequently encountered in laboratory and in situ investigations. With consideration of a sudden drop in boundary hydraulic heads, aquitard compaction characteristics and their sensitivities to the non-Darcy flow control variables were analyzed. The non-Darcy flow was found to retard groundwater drainage, and the retardation effects were much more significant at early-to-intermediate time points. Under this specific boundary condition, the time-compaction curve in a log-log graph at early time points was found to be close to a straight line, whose slope can be used to indirectly 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 time-compaction data recorded in a laboratory experiment. The tested aquitard was determined to be associated with non-Darcy flow due to the fact that the time-compaction curve deviated from the Darcy's law-based theoretical curve. Darcy's law resulted in an underestimated K. In contrast, the estimated Ss was almost unaffected by the flow state, if the observation lasted long enough to reach final steady compaction.

     

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