Water Surface Evaporation Characteristic Analysis of Hebei Province

The 60-year evaporation data from 46 water surface evaporation stations of Hebei province from 1951 to 2010 are used to analyze the conversion coefficient of evaporation between the 20 cm diameter evaporation pan and the E601 type evaporator.The entire province is divided into six sub-regions,and the monthly conversion coefficients for different types of evaporators are investigated for each sub-region.Then the evaporation data from different types of evaporators are converted into the data for the E601 type evaporator based on the conversion coefficients,which is beneficial to evaluate the evaporation from water surface spatially and temporally in Hebei province.The spatial variation of evaporation indicates a tendency of higher evaporation in the north than the south and a larger evaporation in the plains than the mountains.Furthermore,the yearly evaporation decreases with a significant interWater Surface Evaporation Characteristic Analysis of Hebei Provinceannual variation.The maximum evaporation appeared in the 1960 s.After 1983,the evaporation was usually less than the average value.