Spatiotemporal Characteristics and Variation Trends of Annual Maximum Rainfall Intensity in Guizhou
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Abstract:
Based on the existing data of selfrecorded and automatic precipitation in Guizhou, the temporal and spatial distribution characteristics of the annual maximum rainfall intensity, the maximum rainfall intensity during 1954-2017 in national meteorological stations in Guizhou, and the variation trends of rain intensity from 1968 to 2017 are statistically analyzed. The results show that the annual rain intensity in Guizhou was between 13.6 mm to 117.4 mm per hour, and the maximum of the years in Guizhou was between 53.0 mm to 117.4 mm per hour. The hourly maximum rainfall intensity in the southwest, midwest, northeast, and southeast areas were all over 100 mm per hour. The southwest had the strongest rainfall intensity. The heavy rainfall in Guizhou occurred from March to November, mainly between May and August, while the heaviest rainfall happened in June. The heavy rainfall in Guizhou was characterized by obvious night occurrence, usually around 02:00 at midnight, more in the first half of the night than in the second half. The occurrence frequency at noontime was the least. The increase/decrease trend of rain intensity in Guizhou was not obvious, with the slight increases in southeast, south and west, and the slight decreases in northeast and northwest.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.