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JOURNAL OF DESERT RESEARCH  2008, Vol. 28 Issue (4): 741-747    DOI:
天气与气候     
Daily Precipitation Pattern and Its Temporal Variability in Heihe River Basin
ZHANG Li-jie, ZHAO Wen-zhi
Laboratory of Watershed Hydrology and Ecology, CAREERI, Chinese Academy of Sciences; Linze Inland River Basin Research Station, CERN, Lanzhou 723000, China
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Abstract  Daily precipitation patterns are characterized for an area of Heihe river basin, with emphasis on temporal variability, based on daily precipitation data from 1950 to 2000 recorded by ten stations. The results show: ①Taking the 10 stations as a whole, 82% of all of the precipitation events received at arid and semiarid sites in Heihe river basin are ≤5 mm in the past 50 years, 40.7% of dry periods (intervals between precipitation events) are ≤10 days and 59.3% are ≥10 days. ②There is a significantly positive correlation between rain-days and annual rainfall in Heihe river basin (r=0.78, P<0.01), annual rainfall is significantly correlated with the amount of water received in events larger than 10 mm, but not with the amount of water received in events smaller than 5 mm.③The range of annual accumulation water received in events larger than 10 mm is 0~262.6 mm and in events smaller than 5 mm is 20.3~172.7 mm, and the Cv range is 0.25~0.92, 0.17~0.25 respectively.④In past 50 years, it is found that the annual precipitation in most of Heihe river basin showed an increasing trend, the days with light rain (≤5 mm·d-1) have been reduced slightly, the days above moderate rain (≥10 mm·d-1) have been increased slightly, the frequency of short dry periods (≤10 days) showed no significant trend, the frequency of long dry periods (≥10 days) is found to increase remarkably, and rainy days display no evident trend.
Key words:  Heihe river basin      precipitation size class      dry period      rain days      precipitation pattern     
Received:  11 June 2007      Published:  20 July 2008
ZTFLH:  P423.3  
Articles by authors
ZHANG Li-jie
ZHAO Wen-zhi

Cite this article: 

ZHANG Li-jie;ZHAO Wen-zhi. Daily Precipitation Pattern and Its Temporal Variability in Heihe River Basin. JOURNAL OF DESERT RESEARCH, 2008, 28(4): 741-747.

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http://www.desert.ac.cn/EN/     OR     http://www.desert.ac.cn/EN/Y2008/V28/I4/741

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