Integration of Penman approach with complementary principle for evaporation research |
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| Authors: | Songjun Han Fuqiang Tian |
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| Institution: | 1. State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, Beijing, China;2. National Center of Efficient Irrigation Engineering and Technology Research, Beijing, China;3. Department of Hydraulic Engineering, State Key Laboratory of Hydro‐science and Engineering, Tsinghua University, Beijing, China |
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| Abstract: | Natural evaporation occurs with water transportation from an unsaturated land surface into an unsaturated atmosphere. The subprocesses at the land surface and in the atmosphere are one‐sidedly emphasized in the Penman approach and the complementary principle, in which the ratio of actual evaporation to the Penman potential evaporation is expressed as a function of the wetness state of the land surface and the atmosphere, respectively. The Penman approach and complementary principle can be integrated for completely conceptualizing the evaporation process, by expressing the evaporation ratio as a function of both the land surface and atmospheric wetness. The integrated approach has the potential to increase the accuracy of evaporation estimation while reducing the burdens of parameterization. |
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| Keywords: | complementary principle evaporation Penman approach |
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