Measurement of Evaporation on Bare Soil and Estimating Surface Resistance
Measurement of Evaporation on Bare Soil and Estimating Surface Resistance
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DOI：
10.1061/(asce)0733-9372(2003)129:12(1157
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发表时间：
2003-12
影响因子：
2.2
通讯作者：
Shriyangi Aluwihare;Kunio Watanabe
中科院分区：
文献类型：
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作者：
Shriyangi Aluwihare;Kunio Watanabe
研制了一种带有蒸发室的新型蒸发量测量装置，并对其精度进行了检验。这种装置的独特之处在于，它使用一端完全开放的燃烧室，从而将燃烧室对温度、湿度和湍流的自然分布的影响降至最低。它被用来估计在干燥的表土条件下新制定的地表对裸土蒸发的阻力。建立了一个包含蒸发表面深度的简单能量平衡模型，并结合一种描述表面阻力的新方法，在假设理想条件下，用一组从简单实验获得的有限数据成功地进行了检验。除了新制定的表面阻力外，还估算了干土层的深度，并与实测值进行了比较。与干燥土层施加的阻力相比，新配方的表面阻力被发现微不足道。土壤表层0-1 cm土壤总阻力与土壤水分呈幂函数关系，而与土壤水分关系不大。
A new evaporation measuring device incorporating an evaporation chamber has been developed and checked for its accuracy. This device is unique that it uses a chamber that is completely open at one end and thereby minimizes the effect of the chamber on the natural profiles of temperature, humidity, and turbulence. It was used in estimating a newly formulated surface resistance to bare soil evaporation under dry topsoil conditions. A simple energy balance model incorporating the depth of evaporating surface, blended with a new approach for describing surface resistance was developed and successfully tested with a limited set of data obtained from a simple experiment, assuming ideal conditions. In addition to the newly formulated surface resistance, the depth of the dry soil layer was also estimated and was relatively comparable with measured value. The newly formulated surface resistance was found to be insignificant compared to the resistance imposed by the dry soil layer. The total surface resistance was modeled as a power function of soil moisture in the top 0–1 cm of soil, while the newly formulated resistance did not show any relation with the soil moisture.