干旱区生态环境知识资源中心(Arid): Gravity fingering control on evaporation and deep drainage in a 3D porous medium

Arid

DOI	10.1016/j.jhydrol.2022.127723
	Gravity fingering control on evaporation and deep drainage in a 3D porous medium
	Liyanage, Rebecca; Juanes, Ruben
通讯作者	Juanes, R
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2022
卷号	610
英文摘要	Water infiltration in soils is a fundamental hydrologic process that determines the water availability for plant roots and the rate of recharge to deep groundwater bodies. When both the initial water saturation of the soil and the water infiltration rate is low, the infiltration front becomes unstable, resulting in gravity fingers that act as preferential flow channels. Preferential flow may allow for the rapid bypass of water through the evaporation zone, thereby promoting deep drainage of water into the subsoil even in arid and semi-arid regions, where the potential evapotranspiration (PET) is high and the mean annual precipitation (MAP) is low. Here, we investigate experimentally the impact of gravity fingering on deep drainage coupled with surface evaporation in a 3D porous medium. We use a cylindrical vessel packed with dry glass beads, and reproduce seasonal climatic patterns consisting of relatively short rainfall events alternating with periods of intense evaporation. We vary the volume of rainfall events and the interval between rainfall events to replicate climate conditions. We record the mass of water in the system throughout the experiment, and determine the partition between evaporation and deep drainage before and after the onset of fingering. We find that in semi-arid conditions, the fraction of water that bypasses the evaporation zone increases fourfold after gravity fingering starts. This finding has potentially important implications for understanding infiltration dynamics in arid environments and ecosystems' response in regions susceptible to desertification.
英文关键词	Infiltration Gravity fingering Deep drainage Evaporation Ecohydrology
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000795148300003
WOS关键词	WETTING FRONT INSTABILITY ; PREFERENTIAL FLOW ; STABILITY ANALYSIS ; WATER-MOVEMENT ; UNSTABLE FLOW ; SOIL-MOISTURE ; 2 DIMENSIONS ; INFILTRATION ; FIELD ; GROUNDWATER
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/2XILL650/393494
推荐引用方式 GB/T 7714	Liyanage, Rebecca,Juanes, Ruben. Gravity fingering control on evaporation and deep drainage in a 3D porous medium[J],2022,610.
APA	Liyanage, Rebecca,&Juanes, Ruben.(2022).Gravity fingering control on evaporation and deep drainage in a 3D porous medium.JOURNAL OF HYDROLOGY,610.
MLA	Liyanage, Rebecca,et al."Gravity fingering control on evaporation and deep drainage in a 3D porous medium".JOURNAL OF HYDROLOGY 610(2022).