Diurnal Variations of Summer Precipitation in Urban and Suburb and Influence on Drainage Design in Beijing
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Abstract:
The rainfall data from the Beijing Meteorological Observatory and Miyun Station in Beijing, which were assumed as representative stations for urban and suburban areas, are used. Based on the minutetominute rainfall observation data from 1961 to 2013, comparison and analysis are made of the different cumulative rainfall in summer, the frequency of rainfall, and the precipitation intensity between urban and suburb areas. Also, using the Gumbel method, which can fit annual maximum to derive the equations of rainstorm intensity for urban and suburb areas, their spatial availabilities are compared. The results indicate that there are obvious characteristics in variations of daily rainfall in Beijing, including the larger proportion of rainfall at night and higher occurrence frequency of rainfall from noon to midnight and greater rainfall amount, frequency, and precipitation intensity during 15:00 to 17:00 in both urban and suburb areas; the total rainfall, shortduration rainfall, and precipitation intensity in summer were greater in the suburb area. However, the intensitydurationfrequency curve shows that the rainfall data of urban stations is inapplicable for suburban stations, and the difference between urban suburb areas should be considered. Different standards should be adopted in the design of the drainage system.
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.