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《JOURNAL OF GLACIOLGY AND GEOCRYOLOGY》 2000-02
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Changing Trend and Features of the Runoff from Mountain Areas of Some Main Rivers in the Hexi Inland Region

LAN Yong-chao, KANG Er-si (Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou Gansu 730000, China)  
The Hexi inland region, 37°17′~42°18′N, and 92°23′~104°12′E, is located in the periphery of the Tibetan Plateau and the east of the northwestern arid region of China. The region is an important development area of Gansu Province, with a total area of 2.15×10 6 km 2 . The key to sustainable development in the region is water. Because of water lacking the eco-environment is very vulnerable. The Qilian Mountains is the source region of the Hexi inland arid region. There is about 70×10 8 m 3 of surface water from this area flowing to the corridor plain area each year, which is a basic guarantee for the economy development in the Hexi region. The renewable water resources from the Qilian Mountains is not only an important natural wealth for development of agriculture, forestry and animal husbandry, but also a significant factor for maintaining ecological balance and environment conservation in the arid zone. There have been a decreasing trend of streamflow in the northwestern arid region in China since the 20th century as the climate warming. The changing trend behaves differently from place to place, though it is universal. Water is short in the Hexi region, so to its future variation should pay more attention. Measured data of precipitation, temperature and discharge from meteorological and hydrometric stations in the studied basins were used for researching the changing trend and features of the runoff from the mountain areas of some main rivers in the region. The result shows that the variation of the runoff from the mountain areas of the rivers has the following features: (1) Seasonal variation of runoff from the mountain areas of the main rivers in the Hexi region is mainly regulated by the river's geographical location and supply sources; mainly dependent on precipitation in the Qilian Mountain. (2) Yearly variation of the runoff of the rivers located in the west of the Liyuan River basin in the region is affected mainly by precipitation in the Qilian mountainous. (3) The long-term trend of runoff of the rivers located in the west of the Liyuan river basin is increasing; the runoff of rivers located in the east of the Liyuan River basin is decreasing; the runoff of the central rivers, represented by the Heihe River, is slowly increasing from a low water phase which began from 1990. (4) It is predicted that the runoff of the rivers located in the east of the the region will be decreasing; the runoff of rivers in the central and western parts will be steady or increasing.
【Fund】: 国家重点科技攻关项目!96-912 -0 2专题;; 国家自然科学基金重点项目!( 4 973 10 3 0 )
【CateGory Index】: P333
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