干旱区生态环境知识资源中心(Arid): Layered Green and Ampt Infiltration With Redistribution

Arid

DOI	10.1029/2022WR033742
	Layered Green and Ampt Infiltration With Redistribution
	La Follette, Peter; Ogden, Fred L.; Jan, Ahmad
通讯作者	La Follette, P
来源期刊	WATER RESOURCES RESEARCH
ISSN	0043-1397
EISSN	1944-7973
出版年	2023
卷号	59 期号:7
英文摘要	Numerical solution of the one-dimensional Richards equation (RE) accurately partitions precipitation into infiltration and runoff in capillary dominated soils. However, its application sometimes requires significant computational effort and presents reliability challenges. The Green and Ampt (G & A) approach represents a conservative and efficient method to calculate one-dimensional infiltration but is limited to deep, well drained, uniform, non-layered soils for a single rainfall event. The original G & A model and subsequent advancements represent wetting fronts as discrete objects, rather than discretizing the model domain in space, yielding a computationally simpler model than the RE. This paper describes an extension of the G & A method into layered soils on a continuous basis that we call Layered Green and Ampt with Redistribution (LGAR). Assumptions employed in the derivation include: uniform soil hydraulic properties within layers, single-valued capillary head at the interface between soil layers, and no influence of groundwater table on soil moisture. Wetting fronts advance due to the combined effects of gravity and wetting front capillary drive in a layered soil profile. Results of multi-month continuous LGAR simulations of infiltration using forcing and soil hydraulic data from USDA SCAN sites are compared against infiltration calculated using the HYDRUS-1D RE solver using standard metrics. The assumptions employed in deriving the LGAR method limit its application to situations where cumulative potential evapotranspiration is greater than cumulative precipitation, typical of arid or semi-arid conditions. LGAR is a mass-conservative, computationally efficient, reliable and reasonably accurate method for simulating infiltration over extended time periods compared to the numerical solution of the RE in layered soils in arid and semi-arid regions.
英文关键词	vadose zone precipitation partitioning infiltration runoff soil hydraulics
类型	Article
语种	英语
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:001031918200001
WOS关键词	RICHARDS EQUATION ; HYDRAULIC CONDUCTIVITY ; MODELING INFILTRATION ; NUMERICAL-SOLUTION ; SOILS ; FLOW ; CAPILLARY ; WATER
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/2XILL650/399156
推荐引用方式 GB/T 7714	La Follette, Peter,Ogden, Fred L.,Jan, Ahmad. Layered Green and Ampt Infiltration With Redistribution[J],2023,59(7).
APA	La Follette, Peter,Ogden, Fred L.,&Jan, Ahmad.(2023).Layered Green and Ampt Infiltration With Redistribution.WATER RESOURCES RESEARCH,59(7).
MLA	La Follette, Peter,et al."Layered Green and Ampt Infiltration With Redistribution".WATER RESOURCES RESEARCH 59.7(2023).