干旱区生态环境知识资源中心(Arid): Evaporation From Unsaturated Soils as a Function of the Air and Soil Sides of the Land Surface

Arid

DOI	10.1029/2020WR028643
	Evaporation From Unsaturated Soils as a Function of the Air and Soil Sides of the Land Surface
	de Amesti, Pedro; de la Fuente, Alberto; Suarez, Francisco
通讯作者	de la Fuente, A (corresponding author), Univ Chile, Dept Ingn Civil, Santiago, Chile.
来源期刊	WATER RESOURCES RESEARCH
ISSN	0043-1397
EISSN	1944-7973
出版年	2020
卷号	56 期号:12
英文摘要	A theoretical framework for computing the evaporation from unsaturated soils is presented and validated based on laboratory experiments that were conducted in an uncontrolled environment where forcing variables vary in time according to diurnal meteorological cycles. This theory introduces a dimensionless number that controls the ratio between the actual and potential evaporation from unsaturated soils. The dimensionless number depends on the transfer velocity, which characterizes evaporation into the atmosphere, the diffusion coefficient of water vapor in the soil, and the water table depth. We show that depending on the value of the dimensionless number, evaporation can be limited by either the air-side or the soil-side of the land surface. For large transfer velocity values, evaporation is controlled by water vapor diffusion in the soil, while for shallow water tables, evaporation is controlled by water vapor transport from the land surface into the atmosphere. Despite the good agreement between the shape of the observed and predicted evaporation rates, a fitted dimensionless parameter is required to match the predicted evaporation rates. Possible explanations for this disagreement are given in the discussion. Plain Language Summary This article seeks to understand and quantify the hydrological cycle in closed basins that are found in the Altiplano region of the Andes Cordillera of South America. These closed basins are found in the desert and, by definition, have no outflow rivers, so the water that precipitates in the catchment must be completely evaporated within the catchment. An important part of this evaporation occurs in the open wetlands (many of which are protected by both national and international laws), which are found in the central depression of the basin, as well as in from the surrounding desert, where groundwater is located at a certain depth below the land surface. In this article, we propose and validate a simple expression for computing soil water evaporation and conduct laboratory experiments in an uncontrolled environment where air and soil temperatures, air humidity, and wind speed vary over time according to diurnal meteorological cycles.
类型	Article
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:000603660400027
WOS关键词	WATER ; GROUNDWATER ; COLUMN ; LAYER
WOS类目	Environmental Sciences ; Limnology ; Water Resources
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/349227
作者单位	[de Amesti, Pedro; de la Fuente, Alberto] Univ Chile, Dept Ingn Civil, Santiago, Chile; [Suarez, Francisco] Pontificia Univ Catolica Chile, Dept Ingn Hidraul & Ambiental, Santiago, Chile; [Suarez, Francisco] CONICYT, FONDAP 15110020, Ctr Desarrollo Urbano Sustentable CEDEUS, Santiago, Chile; [Suarez, Francisco] CONICYT, FONDAP 15090013, Ctr Excelencia Geotermia Andes CEGA, Santiago, Chile
推荐引用方式 GB/T 7714	de Amesti, Pedro,de la Fuente, Alberto,Suarez, Francisco. Evaporation From Unsaturated Soils as a Function of the Air and Soil Sides of the Land Surface[J],2020,56(12).
APA	de Amesti, Pedro,de la Fuente, Alberto,&Suarez, Francisco.(2020).Evaporation From Unsaturated Soils as a Function of the Air and Soil Sides of the Land Surface.WATER RESOURCES RESEARCH,56(12).
MLA	de Amesti, Pedro,et al."Evaporation From Unsaturated Soils as a Function of the Air and Soil Sides of the Land Surface".WATER RESOURCES RESEARCH 56.12(2020).