干旱区生态环境知识资源中心(Arid): Water percolation in a thick unsaturated loess layer considering the ground-atmosphere interaction

Arid

DOI	10.1002/hyp.13364
	Water percolation in a thick unsaturated loess layer considering the ground-atmosphere interaction
	Hou, Xiaokun 1,2; Li, Tonglu 1; Vanapalli, Sai K.2; Xi, Yu 1
通讯作者	Li, Tonglu
来源期刊	HYDROLOGICAL PROCESSES
ISSN	0885-6087
EISSN	1099-1085
出版年	2019
卷号	33 期号:5 页码:794-802
英文摘要	The key objective of this paper is to advance our present understanding of how surface water infiltrates in thick unsaturated loess, which is found in arid and semiarid regions of the world, considering the ground-atmosphere interaction. In situ data for a period of 1 year in thick loess layer at a site in the Loess Plateau of China that has groundwater table at 97.5 m depth were collected for achieving this objective. Climate factors, mainly rainfall and actual evaporation, were measured. In addition, variations of soil temperature and water content at different depths in the unsaturated zone were also measured. The data were used to interpret the water percolation characteristics by dividing the thick unsaturated zone into three zones; namely, (i) surface zone, which constitutes the top 1.0 m, (ii) unsteady zone, which is from 1.0 to 7.0 m, and (iii) steady zone, which is below 7.0 m. In the surface zone, soil temperature and water content are sensitive to climate factors. There is a variation of water content associated with the cumulative influence of infiltration and evaporation in the precipitation and nonprecipitation periods, respectively. In the unsteady zone, the water content is relatively constant; however, temperature varies in different seasons. Water percolation in this zone is both in liquid and vapour phases. In the steady zone, both soil temperature and water content are constant during the entire investigation period. The percolation velocity in this zone is approximately 1.23 x 10(-8) m/s or 0.39 m/year, which suggests that it will take approximately 230.8 years for surface water to pass through the thick unsaturated zone and recharge the groundwater.
英文关键词	ground atmosphere interaction loess unsaturated zone water percolation
类型	Article
语种	英语
国家	Peoples R China ; Canada
收录类别	SCI-E
WOS记录号	WOS:000458923700009
WOS关键词	HYDRAULIC CONDUCTIVITY ; INFILTRATION ; EVAPORATION ; TRANSPORT ; EQUATION ; FLUXES ; SOILS ; HEAT
WOS类目	Water Resources
WOS研究方向	Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/216187
作者单位	1.Changan Univ, Dept Geol Engn, Xian 710054, Shaanxi, Peoples R China; 2.Univ Ottawa, Dept Civil Engn, Ottawa, ON, Canada
推荐引用方式 GB/T 7714	Hou, Xiaokun,Li, Tonglu,Vanapalli, Sai K.,et al. Water percolation in a thick unsaturated loess layer considering the ground-atmosphere interaction[J],2019,33(5):794-802.
APA	Hou, Xiaokun,Li, Tonglu,Vanapalli, Sai K.,&Xi, Yu.(2019).Water percolation in a thick unsaturated loess layer considering the ground-atmosphere interaction.HYDROLOGICAL PROCESSES,33(5),794-802.
MLA	Hou, Xiaokun,et al."Water percolation in a thick unsaturated loess layer considering the ground-atmosphere interaction".HYDROLOGICAL PROCESSES 33.5(2019):794-802.