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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Extension of an existing model for soil water evaporation and redistribution under high water content conditions
Soil Science Society of America Journal, Volume 73, No. 3, Year 2009
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Description
Most crop, hydrology, and water quality models require the simulation of evaporation from the soil surface. A model developed by J.T. Ritchie in 1972 provides useful algorithms for estimating soil evaporation, but it does not calculate the soil water redistribution resulting from evaporation. A physically-based model using diffusion theory, described previously by Suleiman and Ritchie in 2003, provides efficient algorithms for soil water redistribution and soil evaporation. However, the model is appropriate only for second stage drying when the soil in the entire profile being simulated is below the drained upper limit (θ DUL) AND NO MORE drainage occurs due to gravity. This paper extends the Suleiman - Ritchie model for soil water contents higher than θ DUL where soil evaporation rates are usually higher than second stage drying. New algorithms were developed for these wetter conditions that are functions of soil depth and the wetness of the near-surface soil. New model parameters were calibrated with data measured in laboratory soil column studies. The resulting model was integrated into DSSAT-CSM (Decision Support System for Agrotechnology Transfer Cropping Systems Model). Simulated soil evaporation rates and soil water contents obtained using the Suleiman-Ritchie model with the developed extensions and the previous DSSAT soil evaporation model were compared and evaluated with field measurements of soil water content during several drying cycles for parts of 3 yr in North Central Florida. Computed soil water contents from the model agreed well with the measured soil water contents near the surface, and provided more accurate estimations than the original DSSAT soil evaporation model, especially for the 5-cm surface layer. © Soil Science Society of America.
Authors & Co-Authors
Ritchie, Joe T.
United States, Gainesville
University of Florida
Porter, Cheryl H.
United States, Gainesville
University of Florida
Judge, Jasmeet
United States, Gainesville
University of Florida
Jones, James W.
United States, Gainesville
University of Florida
Suleiman, Ayman A.
Jordan, Amman
The University of Jordan
Statistics
Citations: 59
Authors: 5
Affiliations: 2
Identifiers
Doi:
10.2136/sssaj2007.0325
ISSN:
03615995
Research Areas
Environmental