Estimation of aquitard hydraulic conductivity and skeletal specific storage considering non-Darcy flow
Estimation of aquitard hydraulic conductivity and skeletal specific storage considering non-Darcy flow
复制标题
考虑非达西流的透水层水力传导率和骨骼特定储存量的估计
DOI：
10.1016/j.wse.2021.09.003
复制
发表时间：
2021-10
影响因子：
4
通讯作者：
Zhi Dou
中科院分区：
文献类型：
--
作者：
Chao Zhuang;Long Yan;Zhifang Zhou;Jinguo Wang;Zhi Dou
达西定律已被广泛用于研究含水层内的地下水排水过程。然而，在实验室和现场调查中，经常会遇到非达西渗流。在考虑边界水头骤降的情况下，分析了含水层压实特性及其对非达西流量控制变量的敏感性。非达西流对地下水排泄有一定的滞留作用，且在早、中时间点的滞留作用更为明显。在这一特定的边界条件下，早期时间点的对数-对数图中的时间压实曲线接近于一条直线，其斜率可以间接地评价非达西效应的程度。提出了一种估算含水层导水率(K)和骨骼比贮存量(SS)的非达西流型曲线法，并用该方法解释了室内试验记录的时间压实数据。由于时间压实曲线偏离了基于达西定律的理论曲线，被测含水层被确定为与非达西流动有关。达西定律导致低估了K。相反，如果观测持续足够长的时间以达到最终的稳定压实，则估计的SS几乎不受流动状态的影响。
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.
登录
查看更多内容
一种估算弱透水层水力参数的联合分析方法
影响因子：
2.6
作者：
Zhuang Chao;Zhou Zhifang;Illman Walter A
通讯作者：
Illman Walter A
影响因子：
2.8
作者：
Zhaofeng Li;Zhifang Zhou
通讯作者：
Zhaofeng Li;Zhifang Zhou
固结压力对粘土衬层污染物运移的影响
影响因子：
4
作者：
张志红
通讯作者：
张志红
影响因子：
5.2
作者：
C. Neuzil
通讯作者：
C. Neuzil
DOI：
10.1061/(asce)0733-9437(2009)135:1(102
发表时间：
2008-04
期刊：
Journal of Irrigation and Drainage Engineering-asce
影响因子：
--
作者：
S. Singh
通讯作者：
S. Singh