气候变化领域集成服务门户(CCPortal): A Physically Based Method for Soil Evaporation Estimation by Revisiting the Soil Drying Process

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DOI	10.1029/2019WR025003
	A Physically Based Method for Soil Evaporation Estimation by Revisiting the Soil Drying Process
	Wang, Yunquan; Merlin, Oliver; Zhu, Gaofeng; Zhang, Kun
通讯作者	Wang, YQ (通讯作者)
发表日期	2019
ISSN	0043-1397
EISSN	1944-7973
起始页码	9092
结束页码	9110
卷号	55 期号:11
英文摘要	While numerous models exist for soil evaporation estimation, they are more or less empirically based either in the model structure or in the determination of introduced parameters. The main difficulty lies in representing the water stress factor, which is usually thought to be limited by capillarity-supported water supply or by vapor diffusion flux. Recent progress in understanding soil hydraulic properties, however, have found that the film flow, which is often neglected, is the dominant process under low moisture conditions. By including the impact of film flow, a reexamination on the typical evaporation process found that this usually neglected film flow might be the dominant process for supporting the Stage II evaporation (i.e., the fast falling rate stage), besides the generally accepted capillary flow-supported Stage I evaporation and the vapor diffusion-controlled Stage III evaporation. A physically based model for estimating the evaporation rate was then developed by parameterizing the Buckingham-Darcy's law. Interestingly, the empirical Bucket model was found to be a specific form of the proposed model. The proposed model requires the in-equilibrium relative humidity as the sole input for representing water stress and introduces no adjustable parameter in relation to soil texture. The impact of vapor diffusion was also discussed. Model testing with laboratory data yielded an excellent agreement with observations for both thin soil and thick soil column evaporation experiments. Model evaluation at 15 field sites generally showed a close agreement with observations, with a great improvement in the lower range of evaporation rates in comparison with the widely applied Priestley and Taylor Jet Propulsion Laboratory model.
关键词	HYDRAULIC CONDUCTIVITY POROUS-MEDIA CAPILLARY CONDENSATION BARE SOIL WATER MODEL SURFACE MOISTURE PARAMETERIZATION ENERGY
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
WOS类目	Environmental Sciences ; Limnology ; Water Resources
WOS记录号	WOS:000496482200001
来源期刊	WATER RESOURCES RESEARCH
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/259602
推荐引用方式 GB/T 7714	Wang, Yunquan,Merlin, Oliver,Zhu, Gaofeng,et al. A Physically Based Method for Soil Evaporation Estimation by Revisiting the Soil Drying Process[J]. 中国科学院青藏高原研究所,2019,55(11).
APA	Wang, Yunquan,Merlin, Oliver,Zhu, Gaofeng,&Zhang, Kun.(2019).A Physically Based Method for Soil Evaporation Estimation by Revisiting the Soil Drying Process.WATER RESOURCES RESEARCH,55(11).
MLA	Wang, Yunquan,et al."A Physically Based Method for Soil Evaporation Estimation by Revisiting the Soil Drying Process".WATER RESOURCES RESEARCH 55.11(2019).