| Distribution characteristics of Hexi corridor inland river basins’runoff in recent 51 years |
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| DOI：10.7606/j.issn.1000-7601.2009.05.38 |
| Key Words: Hexi corridor three large inland rivers runoff changing tendency Morlet wavelet transformation |
| Author Name | Affiliation | | GUO Liangcai | Key Laboratory of Arid Climatic Changing and Reducing Disaster of Gansu Province Institute of Arid Meteorology China Meteorology Administration, Lanzhou, Gansu 730020, China；Jiuquan Meteorological Bureau, Jiuquan, Gansu 735000, China | | WANG Fucun | Zhangye Meteorological Observatory, Zhangye, Gansu 734000, China | | WU Fangrong | Baiyin Meteorological Observatory, Baiyin, Gansu 730900, China | | LIU Xiaoyun | Jiuquan Meteorological Bureau, Jiuquan, Gansu 735000, China |
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| Abstract: |
| Based on using the river flux and actual meteorological data of three inland rivers (Shule, Hei and Shiyang) in Hexi corridor from 1955 to 2005 and application of several numerical methods, the annual and quarter variations of runoff in recent 51 years in the drainage basins was systematically analyzed, and the runoff variation of the rivers' outlet from mountains was estimated.The results showed that the runoff distribution in the corridor varies dramatically in a year, and the flood season's peak current capacity of the three rivers appears in an identical period.The amount of runoff from west to east occupies 74.75%, 75.04% and 80.94% of the year's total amount, respectively;for the annual variation, normal years are the most and their runoff occupies 38.56% of general sequence, while abundant and the lopsided year only differs 7.84%;the analysis with the methods of accumulative filter and Kendall order correlation indicates that the annual runoff variation tendency overall descends slowly, and the accumulatively mean curves of the three rivers' runoff tend to be a superposition in 2005;Morlet analysis of the flow rate can predict that it will be relatively dry in the future. |
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