Formation of the Dry Surface Layer and Its Effect on Bare Soil Evaporation : Field Observation and Numerical Experiments 

作成者 Yamanaka, Tsutomu, Takeda, Atsushi, Shimada, Jun
日本十進分類法 (NDC) 512.75, 451, 454
内容 研究概要:Field measurements of soil water content, temperature, and relative humidity were made at several depths within a lysimeter where the dry surface layer (DSL) formed. The observed water content was almost constant in the DSL, while it increased toward deeper depth below the DSL. In addition, the peak of vapor density was observed at the bottom boundary of the DSL. Similar features to those observed was shown by numerical computations using a one-dimensional model of water and heat with high vertical-resolution. Furthermore, the result of numerical computations also demonstrated that the evaporating zone was located at the bottom boundary of the DSL, and that the thickness of the evaporating zone was extremely small, except for highly retentive soils. These results of both the field observation and numerical experiments indicate that information of the thickness of the DSL is required rather than that of water content of surface soil, to evaluate evaporation from bare soil surfaces.
コンテンツの種類 研究報告書 Research Paper
掲載誌情報 Proceedings of the international symposium on "The role of remote sensing for the environmental issues in arid and semi-arid regions" page.117-122 (1997)
言語 英語

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