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Study on the Variation Characteristics and Trend of MountainousRunoff in the Heihe River Basin

LAN Yongchao; Kang Ersi; JIN Huijun; ZHANG Shengcai;CHEN Mingzheng2; CHEN Xuelin2;(1 Lanzhou Institute of Glaciology and Geocryology, CAS, Lanzhou 730000; 2 Zhangye AdministrativeOffice of Hydrology and Water Resources of Gansu Province, Zhangye 734000)  
The Heihe River basin aboveYingluoxia Gorge,10 009 km2 in area, is a greater inland river watershed in the arid Northwest China. Itsmain stream, with a length of 821 km, originates inthe Qilian Mountains and flows throught the HexiCarridor of Gansu Province and enters the westernpart of the inner Mongolia Plateau. The surfacerunoff volume of the Heihe River basin nearly allcomes from the mountainous watershed above theYingluoxia Gorge (mountain entrance). Annual variation characteristics of the surface runoff of the mainstream of the river above the gorge were analysed anddiscussed by using the methods of classification, departure accumulation and spectral analysis, based onthe observations of precipitation, temperature anddischarge at the adjacent metrologic and hydrometricstations in the studied basin, and on field investigation.
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