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| Diurnal Variation of Precipitation in Flood Season over the Shiyanghe River Basin |
| Li Lingping1, Liu Weicheng2, Zhang Yulin1, Wang Rongzhe1, Li Yanying1, Li Hongying3 |
1. Wuwei Meteorological Bureau, Wuwei 733000, Gansu, China;
2. Lanzhou Central Meteorological Observatory, Lanzhou 730020, China;
3. Jiuquan Meteorological Bureau, Jiuquan 735000, Gansu, China |
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Abstract Based on the hourly precipitation data from 32 regional meteorological stations and 5 automatic meteorological stations in flood season (from June to August) over the Shiyanghe River basin from 2009 to 2013, we analyzed the diurnal variation characteristics of precipitation in flood season over the Shiyanghe River basin, by using four precipitation indices (hourly precipitation, hourly precipitation frequency, hourly precipitation intensity, and different duration precipitation). The results show that the spatial distribution of hourly precipitation, hourly precipitation frequency in flood season declines from upstream to downstream over the Shiyanghe River basin because of geographical position, altitude, latitude and weather systems, and the spatial distribution of hourly intensity is complex. The precipitation, the precipitation frequency and the precipitation intensity in flood season over the Shiyanghe River basin present a diurnal pattern of three-peak distribution, with the peak periods at 20:00-23:00, 01:00-09:00 and 14:00-20:00, strong precipitation present double-peak with the peak period at 20:00-23:00\} and 14:00-20:00. In flood season, total precipitations and precipitation frequencies of 1-3 h short-time rainfall are more than long time rainfall continued more than 10 h over the Shiyanghe River Basin. The short-time rainfall continuing within 1-6 h often occurrs from afternoon to evening, the long time rainfall continuing more than 6 h often occurres from evening to early morning or late afternoon to evenin
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Received: 01 October 2014
Published: 20 September 2015
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2015, Vol. 35 
