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根据宜昌蒸发站历年实测资料分析得出，水面蒸发量随温度的变化可以分为升温期和降温期。各类型蒸发器（皿）的水面蒸发量与２０ｍ２蒸发池的水面蒸发量的关系皆呈指数关系。所建立的经验公式使用简便、精度较高，是一种较好的换算方法。
According to the historical data of Yichang Evaporation Station, it can be concluded that the variation of water evaporation with temperature can be divided into heating period and cooling period. The relationship between the water surface evaporation of each type of evaporator (dish) and the water surface evaporation of the 20m2 evaporation pond are exponential. The established empirical formula is easy to use and high precision, which is a good conversion method.