EVAPORATION, AND MOISTURE AND HEAT FIELDS IN THE SOIL
EVAPORATION, AND MOISTURE AND HEAT FIELDS IN THE SOIL
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DOI：
10.1175/1520-0469(1957)014
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发表时间：
1957-01-01
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影响因子：
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通讯作者：
PHILIP, JR
中科院分区：
文献类型：
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作者：
PHILIP, JR
土壤中水分和热场研究的最新进展被应用于裸露土壤表面的蒸发问题。大多数分析局限于稳定条件，但它明确地表明，给定土壤剖面的干燥有三个阶段：(1)只要土壤足够潮湿，蒸发速率E与饱和表面是无法区分的，例如。(2)在中等含水率下，E与E_5无关，仅与土壤水分分布有关。(3)当土壤表层足够干燥时，E对土壤中的热通量非常敏感，E与E5之间可能存在负相关。其中的第一个和第二个对应于初始饱和土壤和其他多孔介质的“等温”干燥的众所周知的恒定和下降速率阶段，因此得到了定量的物理解释。也有实验证据表明3D相的存在。本文的其他结果包括：(1)建立了非完全蒸发面能量平衡的(稳态)模型(E
Recent developments in the study of moisture and heat fields in the soil are applied to the problem of evaporation from bare soil surfaces. Most of the analysis is confined to steady conditions, but it definitely suggests that there are 3 phases to the desiccation of a given soil profile: (1) So long as the soil is sufficiently moist, the evaporation rate, E, is indistinguishable from a saturated surface, Eg. (2) At intermediate moisture contents, E is independent of E5 and depends only on the soil-moisture distribution. (3) When the surface layers of the soil are sufficiently dry, E is sensitive to the heat flux in the soil, and a negative correlation between E and E5 may follow. The 1st and 2d of these correspond to the well-known constant and falling rate phases of the "isothermal" drying of initially saturated soils and other porous media, which thus receive quantitative physical explanation. There is experimental evidence of the existence of the 3d phase also. Other results of the article include: (1) Development of a (steady state) model of the energy balance at imperfectly evaporating surfaces (E