Hysteresis of saturation-capillary pressure relations under consecutive drainage-imbibition cycles in fine sandy medium
Hysteresis of saturation-capillary pressure relations under consecutive drainage-imbibition cycles in fine sandy medium
复制标题
细砂介质连续排水-自吸循环下饱和度-毛管压力关系的滞后性
DOI：
10.1007/s11771-012-0995-4
复制
发表时间：
2012
影响因子：
4.4
通讯作者：
Qing
中科院分区：
文献类型：
--
作者：
Xiao;Yan Li;B. Xia;Li;Yuanyuan Su;Qing
在细砂介质中，研究了由预定水位波动引起的连续排水-吸胀循环下饱和-毛管压力（S-p）关系的滞后性。排水-吸胀循环从排水过程开始，依次以吸胀过程结束。用时域反射（TDR）探针和T5张力计在线测量饱和度和毛细管压力。结果表明：滞回程度与排吸循环次数关系不明显；在排水-渗吸循环中，随着渗吸过程初始含水饱和度的增加，渗吸程度逐渐减小。砂质介质的空气进入压力也被发现是恒定的，它与排水-吸胀循环和排水过程的初始含水饱和度无关。在各渗吸过程中，van Genuchten （VG）模型参数α随初始含水饱和度的增大而减小，与滞回的大小成正比。
The hysteresis of saturation-capillary pressure (S-p) relations was investigated in a fine sandy medium under consecutive drainage-imbibition cycles, which resulted from scheduled water level fluctuations. A drainage-imbibition cycle starts with a drainage process and ends with an imbibition process in sequence. The saturation and capillary pressure were measured online with time domain reflectometry (TDR) probes and T5 tensiometers, respectively. Results show that the relation between the degree of hysteresis and the number of the drainage-imbibition cycles is not obvious. However, the degree decreases with the increase of the initial water saturation of the imbibition processes in these drainage-imbibition cycles. The air-entry pressure of a sandy medium is also found to be constant, which is independent of the drainage-imbibition cycles and the initial water saturation of the drainage process. In all the imbibition processes, parameterαof the van Genuchten (VG) model decreases with the increase of the initial water saturation, which corresponds positively to the magnitude of the hysteresis.
测量 DNAPL 迁移的 k-S-p 关系
DOI：
--
发表时间：
2003
期刊：
Engineering Geology Vol.70
影响因子：
--
作者：
Kamon;M.;Endo;K.;Katsumi;T.
通讯作者：
T.