Mechanism of solute transient storage between karst conduit and fissures

被引：0
|
作者：
Luo M. [1 ]
Ji H. [1 ]
机构：
[1] School of Environmental Studies, China University of Geosciences, Wuhan
来源：
Shuikexue Jinzhan/Advances in Water Science | 2022年 / 33卷 / 01期
基金：
中国国家自然科学基金;
关键词：
Breakthrough curves; Conduit-fissures physical model; Karst in Southern China; Solute transport; Transient storage;
D O I：
10.14042/j.cnki.33.1309.2022.01.014
中图分类号：
学科分类号：
摘要：
In karst groundwater, a common phenomenon in the solute transport process is solute transient storage. The mechanism of transient solute storage between karst conduit and fissures are revealed using a constructed physical model of conduit-fissures. Quantitative tracer tests were conducted under concentrated recharge conditions, and the solute transport processes were simulated using the Dual Region Advection Dispersion model. With enhanced concentrated recharge hydrodynamic conditions, the quantity of transient water storage in fissures tends to increase linearly; and the breakthrough curves transform from single peak to double-peaks. A negative correlation between the average flow velocity in conduit and fissures was confirmed. Breakthrough curve shapes are defined by the difference between solute retention times in conduit and fissures. The overall findings are that solute transient storage induces a tailing effect and the phenomenon of double-peaks in breakthrough curves, significantly controlling solute transport processes in karst groundwater. © 2022, Editorial Board of Advances in Water Science. All right reserved.
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页码：145 / 152
页数：7
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