Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019WR026766 |
Graphical interpretation of wet surface evaporation equations | |
Russell J. Qualls; Richard D. Crago | |
2020-09-08 | |
发表期刊 | Water Resources Research
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出版年 | 2020 |
英文摘要 | Potential (wet surface) evaporation is the basis for many methods to estimate actual evaporation. Penman’s (1948) combination of energy budget with mass and energy transfer equations can be depicted on temperature – vapor pressure graphs. Key to this depiction are two straight lines on the graph representing constant enthalpy of the air at measurement height and at the surface skin, with the gap between the lines representing a combination of aerodynamic resistance variables and available energy. The equations on which Penman based his formula are easily solved numerically (without need for Penman’s famous assumption) for T0w, the temperature the surface would have if it was saturated, keeping all other variables constant. Wet surface evaporation is proportional to the vapor pressure difference between the measurement height and the surface skin. Equilibrium evaporation, based on the slope of the vapor pressure curve at T0w is also easily represented in the graph. The difference between the correct wet surface evaporation rate and Penman’s approximation are immediately visible on the graphs. The different wet surface evaporation rates are compared using data from a tropical savanna in Australia. Implications for the classic two‐component interpretation of Penman’s equation are discussed. |
领域 | 资源环境 |
URL | 查看原文 |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/294009 |
专题 | 资源环境科学 |
推荐引用方式 GB/T 7714 | Russell J. Qualls,Richard D. Crago. Graphical interpretation of wet surface evaporation equations[J]. Water Resources Research,2020. |
APA | Russell J. Qualls,&Richard D. Crago.(2020).Graphical interpretation of wet surface evaporation equations.Water Resources Research. |
MLA | Russell J. Qualls,et al."Graphical interpretation of wet surface evaporation equations".Water Resources Research (2020). |
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