Pavement evaporation refers to the process of pavement water vaporization entering the atmosphere. The strength of this process depends on the energy state of the water vapor in the atmosphere. In general, the intensity of evaporation of the soil is lower than that of the free surface, since the free energy of free water is small. When the soil water is close to saturation, its evaporation intensity may be equal to the evaporation intensity of the water surface. Soil evaporation in a certain period of time. Units are in millimeters.
Note
The annual pavement evapotranspiration in the above figure is measured by the century of the small soil evaporator, and the data is the cumulative average of the three decades from 1951 to 1980.
The distribution of pavement evaporation in China decreased from the southeast half step to the northwest half of the Yangtze River, the middle and lower reaches of the Yangtze River plain, southeastern hilly and southern Yunnan region is the largest, reaching more than 800 mm, the northwest desert region the smallest, as small as 50 mm.
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