Abstract:

In order to explore characteristics of change of the water surface evaporation in Benxi mountainous area and the main meteorological factors affecting the evaporation of water surface, based on climate data of E601 evaporation tank, temperature, precipitation, sunshine duration, relative humidity, wind speed and vapor pressure in Caohekou weather station in Benxi from 1953 to 2010, by using gray relational analysis and statistical analysis of the main meteorological factors affecting evaporation.. The results showed that the evaporation of water surface and temperature, precipitation and vapor pressure relations were more closely, and sunshine hours, relative humidity and wind speed related to poor in Benxi mountainous area. The evaporation of water surface in the main meteorological factors in descending order as follows: temperature＞vapor pressure＞precipitation＞sunshine duration＞relative humidity＞wind speed. If the annual average temperature increases 1℃, the annual evaporation of water surface would increase by 66 mm; annual precipitation increased by 10 mm, the surface evaporation would reduce 2.7 mm; 1% annual relative humidity increased, the evaporation of water surface would be reduced by 16 mm; annual average wind speed increased to 1 m/s, and surface evaporation would be reduced by 154 mm. This study revealed the main meteorological factors on the degree of influence of surface evaporation in Benxi mountainous area, water resources for further rational development and utilization to provide a scientific basis.