Against the specific problems,this paper puts forward corresponding improvement measures including design of the convection field and temperature field,significantly the reduction of water tank evaporation surface,heat preservation of water tank by using block to fix outside protective layer.

Two water surface evaporation problems in water resources evaluation;

Model for estimating soil evaporation based on water surface evaporation;

This paper studies the effect of weather change on regional evaporation by analyses change trend of reference crop evapotranspiration(ET0), and the effect of irrigational agriculture development on irrigation district actually measured evaporation from water surface.

According to the conventional meteorology observation data and the water surface evaporation of 20 m2 experimental pool from 1997 to 2000 in Changji,the paper sets up the forecast model of water surface evaporation of the Xinjiang plain area based on BP Neural Network.

There are low precipitation and high evaporation in Xinjiang while water surface evaporation main stem from water loss of river runoff.

In order to make ET estimated conveniently,this research analyzed the correlation between water surface evaporation(E0) and crop evapotranspiration(ET) measured by large scale lysimeter,and the variation of evaporation coefficient.