干旱区生态环境知识资源中心(Arid): Assessing bare-soil evaporation from different water-table depths using lysimeters and a numerical model in the Ordos Basin, China

Arid

DOI	10.1007/s10040-019-02012-0
	Assessing bare-soil evaporation from different water-table depths using lysimeters and a numerical model in the Ordos Basin, China
	Ma, Zhitong 1,2; Wang, Wenke 1,2; Zhang, Zaiyong 1,2; Brunner, Philip 3; Wang, Zhoufeng 1,2; Chen, Li 1,2; Zhao, Ming 1,2; Gong, Chengcheng 1,2
通讯作者	Wang, Wenke
来源期刊	HYDROGEOLOGY JOURNAL
ISSN	1431-2174
EISSN	1435-0157
出版年	2019
卷号	27 期号:7 页码:2707-2718
英文摘要	In semiarid and arid regions, the evaporation from bare soil is highly sensitive to changes in the depth to the water table. This study quantifies the relation between water-table depth and the groundwater contribution to evaporation in the Ordos Basin in China. In-situ field experiments were combined with numerical simulations of heat, vapor and liquid water flow. Based on lysimeter experiments and a calibrated numerical model, a relation between depth to groundwater and evaporation rate was established for the lysimeter site. In addition, a sensitivity analysis considering the hydraulic conductivity and the inverse of the air-entry pressure (vanGenuchten alpha) was established. For the field site, the results showed that for the water-table depths less than 52 cm below the ground, evaporation is independent of the water-table depth. For water-table depths exceeding 52 cm, an exponential relation between depth to groundwater and evaporation is observed. No phreatic evaporation occurs for water tables deeper than 105 cm, which is nearly two times the capillary fringe height. The sensitivity analysis showed that the extinction depth decreased with decreasing hydraulic conductivity and increased with alpha. The field-specific results and the sensitivity analysis provide valuable information to understand the dynamic processes of soil evaporation in the Ordos Basin. From a methodological point of view, the proposed modelling approach and the integration of lysimeter data proved to be a highly efficient combination to study evaporation dynamics in semi-arid and arid environments.
英文关键词	Soil evaporation Extinction depth Numerical modelling Lysimeter Arid-region
类型	Article
语种	英语
国家	Peoples R China ; Switzerland
收录类别	SCI-E
WOS记录号	WOS:000502730500025
WOS关键词	DESERT VADOSE ZONES ; SHALLOW GROUNDWATER ; UNSATURATED ZONE ; HEAT-TRANSPORT ; DYNAMICS ; FLUX ; VAPOR ; FLOW ; EVAPOTRANSPIRATION ; MOISTURE
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
EI主题词	2019-11-01
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/310465
作者单位	1.Changan Univ, Key Lab Subsurface Hydrol & Ecol Effects Arid Reg, Minist Educ, Changan, Peoples R China; 2.Changan Univ, Sch Environm Sci & Engn, Yanta Rd 126, Xian 710054, Shaanxi, Peoples R China; 3.Univ Neuchatel, Ctr Hydrogeol & Geotherm, CHYN, Neuchatel, Switzerland
推荐引用方式 GB/T 7714	Ma, Zhitong,Wang, Wenke,Zhang, Zaiyong,et al. Assessing bare-soil evaporation from different water-table depths using lysimeters and a numerical model in the Ordos Basin, China[J],2019,27(7):2707-2718.
APA	Ma, Zhitong.,Wang, Wenke.,Zhang, Zaiyong.,Brunner, Philip.,Wang, Zhoufeng.,...&Gong, Chengcheng.(2019).Assessing bare-soil evaporation from different water-table depths using lysimeters and a numerical model in the Ordos Basin, China.HYDROGEOLOGY JOURNAL,27(7),2707-2718.
MLA	Ma, Zhitong,et al."Assessing bare-soil evaporation from different water-table depths using lysimeters and a numerical model in the Ordos Basin, China".HYDROGEOLOGY JOURNAL 27.7(2019):2707-2718.