干旱区生态环境知识资源中心(Arid): Modelling groundwater evapotranspiration in a shallow aquifer in a semi-arid environment

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DOI	10.1016/j.jhydrol.2020.124967
	Modelling groundwater evapotranspiration in a shallow aquifer in a semi-arid environment
	Diouf, Ousmane Coly; Weihermueller, Lutz; Diedhiou, Mathias; Vereecken, Harry; Faye, Seynabou Cisse; Faye, Serigne; Sylla, Samba Ndao
通讯作者	Diouf, OC
来源期刊	JOURNAL OF HYDROLOGY
ISSN	0022-1694
EISSN	1879-2707
出版年	2020
卷号	587
英文摘要	The use of diurnal or seasonal water table fluctuation (WTF) to estimate groundwater evapotranspiration (ETG) at different land uses and climate conditions is increasing applied in ecohydrological studies. In this study, we applied the WTF method for a shallow aquifer in an urbanized area in Senegal over the dry season 2000-2013.To analyze the applicability and validity of the WTF method for this site, and to understand the impact of the parameters used in this method, the unsaturated /saturated system was first simulated using the HYDRUS 1D model. The drawdown of the water table ranges from 18.1 to 113.2 cm and 10.4 to 101.9 cm for a bare soil and a perennial grass scenario and is highly related to the annual rainfall of the previous rainy season. The results indicate that the mean daily FAO-PM reference evapotranspiration rates for this area ranged from 2 to 4 mmd(-1) and that the estimated actual evapotranspiration (ETa) from the HYDRUS 1D model ranged between 0.22 to 1.11 and 0.23 to 1.27 mmd(-1) in bare soil and vegetative condition, respectively. ETa and ETG were well correlated for the vegetated scenario. However, the WTF method slightly overestimates ETa fluxes in the bare soil scenario. The study shows that the decline of ETa with water table depth can be simulated by an exponential function. The overall results indicate that higher ETa values were observed when the water table is shallow, suggesting that ETa is mainly driven by the water table depth at this site.
英文关键词	Evapotranspiration Water table fluctuation Semi-arid regions Unsaturated zone
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000568819100061
WOS关键词	HYDRAULIC CONDUCTIVITY ; ENERGY-BALANCE ; GREAT-BASIN ; WATER ; LAND ; EVAPORATION ; VEGETATION ; DYNAMICS ; DEPTH ; FIELD
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/2XILL650/326238
作者单位	[Diouf, Ousmane Coly; Diedhiou, Mathias; Faye, Seynabou Cisse; Faye, Serigne] Univ Cheikh Anta Diop, Fac Sci & Tech, Geol Dept, Dakar BP 5005, Dakar, Senegal; [Weihermueller, Lutz; Vereecken, Harry] Forschungszentrum Julich, Agrosphere Inst IBG 3, D-52425 Julich, Germany; [Sylla, Samba Ndao] Univ Cheikh Anta Diop, Fac Sci & Tech, Dept Plant Biol, Dakar BP 5005, Dakar, Senegal
推荐引用方式 GB/T 7714	Diouf, Ousmane Coly,Weihermueller, Lutz,Diedhiou, Mathias,et al. Modelling groundwater evapotranspiration in a shallow aquifer in a semi-arid environment[J],2020,587.
APA	Diouf, Ousmane Coly.,Weihermueller, Lutz.,Diedhiou, Mathias.,Vereecken, Harry.,Faye, Seynabou Cisse.,...&Sylla, Samba Ndao.(2020).Modelling groundwater evapotranspiration in a shallow aquifer in a semi-arid environment.JOURNAL OF HYDROLOGY,587.
MLA	Diouf, Ousmane Coly,et al."Modelling groundwater evapotranspiration in a shallow aquifer in a semi-arid environment".JOURNAL OF HYDROLOGY 587(2020).