A physically based surface resistance model for evaporation from bare soils

Zhang, Chenming, Li, Ling and Lockington, David (2015) A physically based surface resistance model for evaporation from bare soils. Water Resources Research, 51 2: 1084-1111. doi:10.1002/2014WR015490

Author Zhang, Chenming
Li, Ling
Lockington, David
Title A physically based surface resistance model for evaporation from bare soils
Journal name Water Resources Research   Check publisher's open access policy
ISSN 0043-1397
Publication date 2015
Year available 2015
Sub-type Article (original research)
DOI 10.1002/2014WR015490
Open Access Status
Volume 51
Issue 2
Start page 1084
End page 1111
Total pages 28
Place of publication Hoboken, NJ United States
Publisher Blackwell Publishing
Collection year 2015
Language eng
Formatted abstract
The resistance to vapor transfer across the soil-air interface, termed surface resistance, plays an important role in determining the evaporation rate from unsaturated bare soils. A physically based analytical model is developed to describe the surface resistance under varying liquid water saturation. When the vaporization plane remains in the topmost soil layer (TSL), the model considers the vapor transport through the external diffusive layer (EDL), and the hydraulic connection between the capillary water in the TSL and underneath water source for evaporation. When the vaporization plane develops below the TSL, the model predicts the surface resistance by taking into account the development of the dry soil layer, the major barrier for vapor transport at the soil-drying stage. With the consideration of the soil pore size distribution, the model is applicable to different soil types. The model was validated against six sets of laboratory experiments on the drying process of initially water-saturated soil columns under nonisothermal conditions. These experiments were conducted using different soil types and/or heat intensities above the soil surface. The model was found to perform well over intermediate and low liquid water saturation ranges while underestimating the surface resistance for the high liquid water saturation range. The results suggest that the model overall represents reasonably well the processes underlying the vapor transfer across the soil-air interface.  Future model improvement may be gained by considering the hydraulic connection between the capillary
water and film water in the TSL.
Keyword Dry soil layer
Liquid water transport
Pore Size Distribution
Vapor transport
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2016 Collection
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