ESTIMATION OF UNSTEADY EVAPORATION FROM BARE SOILS BASED ON DIFFERENT SOIL RETENTION CURVE MODELS

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ZAREI GH.; HOMAEE M.; LIAGHAT A.M.

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Journal: Iranian Journal of Irrigation and Drainage Year:2008 | Volume:2 | Issue:2 Page(s): 61-71

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Title

ESTIMATION OF UNSTEADY EVAPORATION FROM BARE SOILS BASED ON DIFFERENT SOIL RETENTION CURVE MODELS

Author(s)

ZAREI GH. | HOMAEE M. | LIAGHAT A.M. | Issue Writer Certificate

Keywords

SOIL EVAPORATIONQ3

SOIL DRYINGQ3

ANALYTICAL SOLUTIONQ4

WATER TABLEQ2

UPWARD FLOWQ2

RICHARD'S EQUATIONQ3

CAMPBELL'S MODELQ3

BROOKS -COREY'S MODELQ3

VAN GENUCHTEN'S MODELQ3

Abstract

A large amount of rainfall and irrigation water in arid and semi-arid regions is lost through soil Surface via evaporation. In the vegetated areas, depends on the plant type, growing stage and irrigation methods, about 10 to 69 percent of the total evapotranspiration belong only to evaporation. In such regions with shallow ground WATER TABLE, high evaporation leads to accumulate salts at the soil surface. Thus, the evaporation phenomenon not only is responsible for water loss but also is a major factor for soil salinization. One major difficulty for accurate estimation of evaporation in the field conditions is lack of simple function with less needed input parameters. The main purpose of this study was to compare three ANALYTICAL SOLUTIONs for one-dimensional non-steady UPWARD FLOW from falling shallow ground WATER TABLE to the soil surface with minimum input data. These ANALYTICAL SOLUTIONs were derived based on the Richards' equation with the initial and boundary conditions governing evaporation process. The solutions were based on the parametric equations of Campbell, Brooks – Corey and the closed from function of Van Genuchten for soil water characteristics. One equation has been obtained for each retention curve, using RICHARD'S EQUATION. In these solutions, the amount of evaporation from the soil surface can be estimated as functions of water-table drowdown and some soil physical properties. Some experimental soil columns with packed silty clay, silty clay loam and sandy loam soils were carried out to evaluate the derived ANALYTICAL SOLUTIONs. While the results indicated reasonable agreements between the observed data and the models outputs, some small discrepancies were also observed. The analytical models were appeared to underestimate the evaporation for a certain period of time. The results also showed that the obtained values with the Van Genuchten's function can provide better prediction than the Brooks - Corey's and the CAMPBELL'S MODELs, respectively.

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APA: Copy

ZAREI, GH., HOMAEE, M., & LIAGHAT, A.M.. (2008). ESTIMATION OF UNSTEADY EVAPORATION FROM BARE SOILS BASED ON DIFFERENT SOIL RETENTION CURVE MODELS. IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, 2(2), 61-71. SID. https://sid.ir/paper/131434/en

Vancouver: Copy

ZAREI GH., HOMAEE M., LIAGHAT A.M.. ESTIMATION OF UNSTEADY EVAPORATION FROM BARE SOILS BASED ON DIFFERENT SOIL RETENTION CURVE MODELS. IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE[Internet]. 2008;2(2):61-71. Available from: https://sid.ir/paper/131434/en

IEEE: Copy

GH. ZAREI, M. HOMAEE, and A.M. LIAGHAT, “ESTIMATION OF UNSTEADY EVAPORATION FROM BARE SOILS BASED ON DIFFERENT SOIL RETENTION CURVE MODELS,” IRANIAN JOURNAL OF IRRIGATION AND DRAINAGE, vol. 2, no. 2, pp. 61–71, 2008, [Online]. Available: https://sid.ir/paper/131434/en

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