干旱区生态环境知识资源中心(Arid): Restriction of groundwater recharge and evapotranspiration due to a fluctuating water table: a study in the Ordos Plateau, China

Arid

DOI	10.1007/s10040-020-02208-9
	Restriction of groundwater recharge and evapotranspiration due to a fluctuating water table: a study in the Ordos Plateau, China
	Zhao, Ke-Yu; Jiang, Xiao-Wei; Wang, Xu-Sheng; Wan, Li
通讯作者	Jiang, XW
来源期刊	HYDROGEOLOGY JOURNAL
ISSN	1431-2174
EISSN	1435-0157
英文摘要	Improved understanding of interactions among the atmosphere, soil water and groundwater can be achieved by observing time-series of soil-water content and water-table fluctuations in a soil profile. Field observations at a site in China show that from mid-June to mid-September, when evapotranspiration is strong, direct groundwater recharge does not occur, and variations in soil-water content in the shallow part of the unsaturated zone are mainly controlled by atmospheric conditions; however, in the deeper part they are controlled by the fluctuating water table. Therefore, a one-dimensional (1D) model with a variable-head lower boundary condition (BC) is built to interpret the responses of soil-water flow to changes in atmospheric and groundwater conditions, and a 1D model with a fixed-head lower BC corresponding to the mean water-table depth is built for comparison. The model with a variable-head lower BC reproduces the observed variations in soil-water content, and results in much smaller groundwater evapotranspiration than the compared model. Moreover, the model with a variable-head lower BC shows a two-sided damping of variations in the soil-water flux from the surface and from the bottom, thus producing a stable middle layer with limited variation in soil-water flux. The limited but stable upward flux in the middle layer indicates restriction of both the direct recharge and evapotranspiration of groundwater. Therefore, this study enhances understanding of interactions between the atmosphere and groundwater in arid regions, and also on the appropriate selection of the lower BC of 1D variably saturated flow models.
英文关键词	Variable-head lower boundary condition Groundwater recharge water budget Zero-flux plane HYDRUS-1D China
类型	Article ; Early Access
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000546503900001
WOS关键词	SOIL-MOISTURE ; HYDRAULIC CONDUCTIVITY ; VADOSE ZONES ; FLOW ; DYNAMICS ; MODEL ; HYSTERESIS ; VEGETATION ; BASIN ; FLUX
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/328080
作者单位	[Zhao, Ke-Yu; Jiang, Xiao-Wei; Wang, Xu-Sheng; Wan, Li] China Univ Geosci, Key Lab Groundwater Circulat & Evolut, Minist Educ, Beijing 100083, Peoples R China
推荐引用方式 GB/T 7714	Zhao, Ke-Yu,Jiang, Xiao-Wei,Wang, Xu-Sheng,et al. Restriction of groundwater recharge and evapotranspiration due to a fluctuating water table: a study in the Ordos Plateau, China[J].
APA	Zhao, Ke-Yu,Jiang, Xiao-Wei,Wang, Xu-Sheng,&Wan, Li.
MLA	Zhao, Ke-Yu,et al."Restriction of groundwater recharge and evapotranspiration due to a fluctuating water table: a study in the Ordos Plateau, China".HYDROGEOLOGY JOURNAL