干旱区生态环境知识资源中心(Arid): Laboratory and numerical simulations of infiltration process and solute transport in karst vadose zone

Arid

DOI	10.1016/j.jhydrol.2024.131242
	Laboratory and numerical simulations of infiltration process and solute transport in karst vadose zone
	Liu, Ruitong; Wang, Jinguo; Zhang, Yibo; Reimann, Thomas; Hartmann, Andreas
通讯作者	Wang, JG
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2024
卷号	636
英文摘要	Groundwater in karst systems is a vital resource, which is often highly vulnerable to contaminants that infiltrate through the vadose zone. Understanding the processes of water and contaminant infiltration in the vadose zone is extremely important for protecting and managing karst water resources. A laboratory-scale physical model based on a typical conceptual model of the karst vadose zone was constructed to characterize the influence of the rainfall intensity and internal structure on the infiltration process and solute transport in the karst vadose zone under controlled conditions. Five factors, including the rainfall intensity, the surface slope, the degree of karstification, the thickness of the transfer zone, and the existence of epikarst, were considered in laboratory experiments. A corresponding lumped-parameter model was subsequently developed to further analyze and investigate the water and solute infiltration processes in the laboratory scale physical model. Recession- and breakthrough curves generated from the lab experiments and the water and solute loss from each reservoir generated from the simulation results were analyzed. The downward trend of breakthrough curves ' peak value and the variation of solute loss ' s proportion in three rainfall events demonstrate that both the increase in thickness and karstification degree will intensify the buffer effect of the karst vadose zone, and this buffer effect is mainly affected by the slow flow system which can be inferred from the increasing percentage of cumulative discharge of slow reservoir ( q S ). With increasing karstification degree, the recession coefficient ( alpha) exhibits opposite trends depending on the existence of epikarst or not, indicating the karstification degree has a more significant effect on hydraulic conductivity ( K ) when an epikarst is present while affecting effective porosity ( phi ) more noticeably in the absence of epikarst. The rainfall intensity affects the results of both experimental and numerical simulation most significantly. The percentage of discharge and solutes flowing from the slow reservoir ( q S and m soil_S ) have negative correlations with rainfall intensity, suggesting a greater influence on fast flow with increasing rainfall intensity.
英文关键词	Karst Vadose Zones Laboratory Experiments Numerical Simulation Rainfall Infiltration Solute Transport
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:001239964800001
WOS关键词	UNSATURATED ZONE ; WATER STORAGE ; ROCKY DESERTIFICATION ; BREAKTHROUGH CURVES ; CATCHMENT SCALE ; FLOW ; MODEL ; SYSTEM ; EPIKARST ; PARAMETERS
WOS类目	Engineering, Civil ; Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Engineering ; Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404590
推荐引用方式 GB/T 7714	Liu, Ruitong,Wang, Jinguo,Zhang, Yibo,et al. Laboratory and numerical simulations of infiltration process and solute transport in karst vadose zone[J],2024,636.
APA	Liu, Ruitong,Wang, Jinguo,Zhang, Yibo,Reimann, Thomas,&Hartmann, Andreas.(2024).Laboratory and numerical simulations of infiltration process and solute transport in karst vadose zone.JOURNAL OF HYDROLOGY,636.
MLA	Liu, Ruitong,et al."Laboratory and numerical simulations of infiltration process and solute transport in karst vadose zone".JOURNAL OF HYDROLOGY 636(2024).