Based on the hourly precipitation data at 23 weather stations in Shaanxi Province from 1961 to 2011, the frequency and intensity of hourly precipitation and extreme hourly precipitation from May to September are analyzed. The results show that: (1) Hourly precipitation frequencies decreased in the north and southwest region of Shaanxi Province, but increased in Guanzhong and the southeast region of the province in flood season in the recent 51 years. The trends of average rainfall intensity in most parts of Shaanxi Province are increasing. The average rainfall hours varies in phrase, and has no clear trend. The intensities of precipitation vary with time have an increasing trend. (2) The trends of extreme hourly precipitation frequencies and intensity are similar and increasing. (3) The daily changes of precipitation are different from north to south. The peak of rainfall mainly occurs in the afternoon in the north of Shaanxi, and in the morning in the south. The daily change of precipitation is small in Guanzhong. The increasing trends of extreme hourly precipitation and its frequencies are more significant during 03:00-10:00 (Beijing time)and it will cause more disaster, especially at night.
CAI Xinling
,
YE Dianxiu
,
SUN Xian
,
LI Ying
,
MAO Mingce
,
ZHAO Xiaomeng
. Hourly Precipitation Variability Features in Shaanxi Province in Flood Season during 1961-2011[J]. Plateau Meteorology, 2014
, 33(6)
: 1618
-1626
.
DOI: 10.7522/j.issn.1000-0534.2013.00110
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