Experimental determination of soil evaporation stages with soil surface temperature

Guo Yu Qiu, Jiftah Ben-Asher

Research output: Contribution to journalArticlepeer-review

56 Scopus citations


Soil evaporation process can be divided into three stages: the constant-rate, the falling-rate, and the low-rate stages. Soil surface temperature is closely related to the soil evaporation rate and soil evaporation stage. The objectives of this study were: (i) to propose an approach to determine the soil evaporation stage by using infrared (IR) radiometers, the three-temperature (3T) model, and the Priestley-Taylor (PT) model; (ii) to test it on three soil types (coarse sand, sand, and clay), and (iii) to apply it using remote sensing. A drying experiment to address these objectives was continuously performed tor 539 h at constant air temperature (25°C) and relative humidity (50%). The results clearly indicated that the combination of the IR radiometers and the PT model had improved the performance of the 3T model. Soil evaporation stages could be determined with the soil evaporation transfer coefficient (ha), a key parameter in the 3T model. At the constant-rate stage, ha was a constant with low value, while cumulative evaporation (Ec) rapidly increased. At the falling-rate stage, ha increased with Ec and the relationship between them was curvilinear. At the end of the falling-rate stage, ha could be >0.90. Our results showed that the application of thermal imaging lor the estimation of ha and the evaporation rate was promising for applying this technique in remote sensing.

Original languageEnglish
Pages (from-to)13-22
Number of pages10
JournalSoil Science Society of America Journal
Issue number1
StatePublished - 1 Jan 2010


  • 3T, three temperature
  • ET, evapotranspiration
  • IR, infrared
  • ML, microlysimeter
  • PT, Priestley-Taylor

ASJC Scopus subject areas

  • Soil Science


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