Advances in Earth Science ›› 2016, Vol. 31 ›› Issue (8): 840-848. doi: 10.11867/j.issn.1001-8166.2016.08.0840.

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Study of Statistical Characteristics of wet Season Hourly Rainfall at Hulu Watershed with Γ Function in Qilian Mountains

Wang Lei, Chen Rensheng *, Song Yaoxuan   

  1. 1.Qilian Alpine Ecology and Hydrology Research Station,Cold and Arid Regions Environmental and Engineering Research Institute, CAS, Lanzhou 730000,China;
    2.Key Laboratory of Inland Ecohydrology, CAS,LanZhou 730000,China
  • Received:2016-05-10 Revised:2016-06-28 Online:2016-08-20 Published:2016-08-20
  • Contact: Chen Rensheng(1974-), male, Yishui City, Shandong Province, Professor. Research areas include cold region hydrology.E-mail:sdwanglei@lzb.ac.cn
  • Supported by:
    Project supported by the National Basic Research Program of China “Research on estimation and simulation of hydrological process in region”(No.2013CBA01806); The National Natural Science Foundation of China “Coupling mechanism and model of eco-hydrological processes in the upper of Heihe River Basin”(No.91225302)

Wang Lei, Chen Rensheng, Song Yaoxuan. Study of Statistical Characteristics of wet Season Hourly Rainfall at Hulu Watershed with Γ Function in Qilian Mountains[J]. Advances in Earth Science, 2016, 31(8): 840-848.

The probability distribution of the wet season hourly precipitation is the important basis for the study of the precipitation distribution, especially in mountainous areas. Hulu watershed is the study area located in the upper reaches of Heihe River, Qilian Mountains. By adopting the maximum likelihood estimation, the shape parameter α and scale parameter β of 6 stations were obtained with observed wet season (May to September) half hourly data, and different intensity precipitation probability density distribution, cumulative probability density and probability of precipitation and elevation and precipitation relationship were analyzed. The shape parameter α and scale parameter β is significantly negatively correlated, shape parameter α and average hourly precipitation distribution is consistent. Local topography is also an important factor to affect the precipitation redistribution and the probability distribution of precipitation in Hulu watershed. In addition to the increase of precipitation events, the probability of 1~3 mm mm/h precipitation increases with the altitude, which is the main reason for the increase of precipitation with altitude.
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