Empirical models of calculating phreatic evaporation from bare soil in Tarim river basin,Xinjiang |
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| Authors: | Shunjun Hu Ruifeng Zhao Changyan Tian Yudong Song |
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| Institution: | (1) Key Laboratory of Oasis Ecology and Desert Environment, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011 Urumqi, China;(2) Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, 830011 Urumqi, China;(3) Graduate School of Chinese Academy of Sciences, 100039 Beijing, China |
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| Abstract: | Based on the experimental data at the Akesu Water Balance Experimental Station (AWBES) from 1990 to 1996, the control conditions
of establishing calculation models of phreatic evaporation have been analyzed, the empirical formulae for calculating the
phreatic evaporation have been presented. The results show that as for a given phreatic depth, the phreatic evaporation increases
nonlinearly with pan evaporation, when pan evaporation reaches the infinity, the phreatic evaporation is close to limiting
phreatic evaporation. The new models overcome the disadvantages of phreatic evaporation overestimation when atmospheric evaporation
demand is great and the linear relationship between phreatic evaporation and pan evaporation. With a high accuracy, the new
models are appropriate to be applied in similar regions without observed data. |
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