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The Hydrological Characteristics of Heihe River Basin

CHEN Wen-xiong(Zhangye Hydrology and Water Resources Survey Bureau,Gansu Province,Zhangye 734000,China)  
This article offers ageneral introduction of the Heihe River Basin.The annual distribution,interyear variation and the regional distribution of the rainfall,evaporationandrunoffinthebasinareanalyzedbasedontheyearsofaccumulateddata.Duetosuchfactorsasshortofrainfall,greatevaporation,lackofwaterresources,sparsecoverageofvegetation,andserioussoilerosion,theHeihevalleyhasafragilebiologicalenvironment.
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