Analysis of Rainfall Features and Calculation of Rainfall Pattern of Short Duration Rainstorm in Wuhan, China

Tao Peng, Jun-chao Wang, Zhi-yong Huang

Resumen


Based on data of daily rainfall in the 66 years from 1951 to 2016 and precipitation/minute data of the heavy rainfall event (daily rainfall > 50 mm) in Wuhan, China, several methods such as linear tendency, cumulative distance, and statistical analysis were used to analyze the rainfall features and to calculate the Rainfall Pattern of Short Duration Storm. It is found that: 1) The average rainfall precipitation in Wuhan was 1260.9 mm from 1951 to 2016, the change trend of annual precipitation in the past 66 years existed two rises and falls. The obvious change happened in 1979. The rainfall mainly concentrated in between April and August, accounting for about 65.8%. 2) In Wuhan city 309 rainstorm days and 65 heavy rainstorm days happened in the past 66 years, each year 4.69 rainstorm days and 0.98 heavy rainstorm days happened, and among average five rainstorm days 1 day was heavy rain. The most number of 12 rainstorm days happened in 1991. The trend of maximum daily rainfall firstly descended from 1951 to 1983, and then it increased up to 2016. 3) The daily rainstorm variation since 2000 shows that the average precipitation of 80 rainstorms was 83.28 mm, the max hour rainfall peak happened at 11:00 am BJT, the maximum average 3-hours rainfall occurred between 10:00 am and 12:00 pm BJT, and the max of average 6-hours rainfall occurred between 07:00 am and 12:00 pm BJT. 4) The coefficient of rainfall peaks for 1-hour rainfall, RP3-1, was about 0.439, and coefficient of rainfall peaks for 2-hour rainfall, RP3-2 was about 0.481.


Palabras clave


Wuhan City, Rainfall Features, Short Duration Storm, Rainfall Pattern, Coefficient of Rainfall Peaks

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DOI: https://doi.org/10.24850/j-tyca-2019-04-01