干旱区生态环境知识资源中心(Arid): A new approach for estimating spatial-temporal phreatic evapotranspiration at a regional scale using NDVI and water table depth measurements

Arid

DOI	10.1016/j.agwat.2022.107500
	A new approach for estimating spatial-temporal phreatic evapotranspiration at a regional scale using NDVI and water table depth measurements
	Zhao, Tianxing; Zhu, Yan; Ye, Ming; Yang, Jinzhong; Jia, Biao; Mao, Wei; Wu, Jingwei
通讯作者	Zhu, Y ; Mao, W
来源期刊	AGRICULTURAL WATER MANAGEMENT
ISSN	0378-3774
EISSN	1873-2283
出版年	2022
卷号	264
英文摘要	Accurate estimation of the spatial-temporal distribution of phreatic evapotranspiration (ET) is critical for managing water resources and preventing soil salinization in arid and semiarid agricultural areas where sub-stantial water-saving efforts are needed. Traditional phreatic ET estimation approaches either are for small scales or cannot consider spatial and/or temporal variations in phreatic ET. This study developed a new approach for estimating the spatial-temporal phreatic ET based on the normalized difference vegetation index (NDVI) and measured water table depths. The NDVI was used to calculate the actual evapotranspiration (ETc act) by scaling it with the reference crop evapotranspiration (ETo). The water table depths measured during the periods of no other factors (i.e., precipitation, irrigation and groundwater extraction) were used to establish an equation used to estimate the phreatic ET contribution coefficient (defined as the ratio of phreatic ET to the corresponding ETc act). To improve estimation accuracy, a time-related correction factor was considered in the equation for esti-mating the phreatic ET. The new approach was used to estimate monthly phreatic ET with a spatial resolution of 250 m in the Hetao irrigation district, located in arid Northwest China. The estimated phreatic ET at different spatial and temporal scales matched well with the groundwater balance model results. The results show that the spatial distribution of phreatic ET is affected by both natural factors (e.g., land cover types) and human activities (e.g., groundwater extraction, planted crops). In the Hetao irrigation district, phreatic ET contributes an average of 24.4% to ETc act during the non-freezing-thawing period (from June to November), demonstrating the essential role of phreatic ET in supporting crop growth and the general ecological environment in arid areas with shallow water table depths. The new approach of estimating spatial-temporal phreatic ET may be used for designing effective and efficient water resource management policies at the regional scale.
英文关键词	Phreatic evapotranspiration estimation Shallow groundwater Remote sensing Irrigation district
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000792815400004
WOS关键词	HETAO IRRIGATION DISTRICT ; CROP COEFFICIENTS ; GROUNDWATER EVAPOTRANSPIRATION ; VEGETATION INDEX ; SOIL-SALINITY ; ROOT-ZONE ; SHALLOW GROUNDWATER ; SAVING PRACTICES ; ARID REGIONS ; WINTER-WHEAT
WOS类目	Agronomy ; Water Resources
WOS研究方向	Agriculture ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/391591
推荐引用方式 GB/T 7714	Zhao, Tianxing,Zhu, Yan,Ye, Ming,et al. A new approach for estimating spatial-temporal phreatic evapotranspiration at a regional scale using NDVI and water table depth measurements[J],2022,264.
APA	Zhao, Tianxing.,Zhu, Yan.,Ye, Ming.,Yang, Jinzhong.,Jia, Biao.,...&Wu, Jingwei.(2022).A new approach for estimating spatial-temporal phreatic evapotranspiration at a regional scale using NDVI and water table depth measurements.AGRICULTURAL WATER MANAGEMENT,264.
MLA	Zhao, Tianxing,et al."A new approach for estimating spatial-temporal phreatic evapotranspiration at a regional scale using NDVI and water table depth measurements".AGRICULTURAL WATER MANAGEMENT 264(2022).