STUDY ON EVAPORATION OF BIELAHONG RIVER BASIN

摘要

The Bielahong River is a typical marsh river whose hydrological characteristics the hy-drological characteristics that of the whole Sanjiang Plain. Evaporation is an important element in water cycle which demonstrates water output. The paper gives the annual evaporation of the basin; calculates the evaporation coefficient in summer and the coefficient between marsh evaporation and pure water evaporation; analyses the ratios of evaporation to precipitation and to runoff; at last the paper reaches a conclusion that in years with different precipitation the effects of marsh on runoff are different.