Abstract
Liuzhou City is located in Guangxi Zhuang Autonomous Region of China. It has a warm and rainy climate and belongs to the middle subtropical monsoon climate. It is a rainstorm and flood-prone area. The work of flood drainage and waterlogging prevention is very important. The “minute to minute” rainfall process data of Liuzhou National Meteorological Observation Station from 1975 to 2014 and the Pilgrim & Cordery method were used to estimate the short-time design rainstorm profile of Liuzhou City, and the profiles of the rainfall lasting for 30, 60, 90, 120, 150, and 180 min were obtained. The research shows that the same rain duration and different recurrence period conditions are consistent with the rainstorm profile. The rainfall duration of 30, 60, 90, 120, and 180 min generally shows single-peak rainstorm profile, and the rainfall duration of 150 min shows double-peak rainstorm profile. Most peaks of each short-time design rainstorm profile are at or ahead of the 1/3 part of the entire rainfall process. During the same recurrence period, the rainfall in peak period fluctuated with the increase of the duration, and the intensity of rainfall increased with the prolonging of the recurrence period.
Highlights
Affected by the urbanization effect, the occurrence probability and rainfall intensity of short-time high-intensity local rainstorm in the central area of the city are greatly increased, which poses great pressure on urban drainage and flood flowing in river (Chen & Li, 2017)
Each rainfall process factor is evenly divided into n time periods according to its own rainfall duration at intervals of 5 min
The rain peak position of the design rainstorm profile lasting for 30 min, 60 min and 150 min were located at or ahead of the 1/2 part of the whole rainfall process, lasting for 90 min, 120 min, 150 min, 180 min ahead of the 1/3 part of the whole rainfall process
Summary
Affected by the urbanization effect, the occurrence probability and rainfall intensity of short-time high-intensity local rainstorm in the central area of the city are greatly increased, which poses great pressure on urban drainage and flood flowing in river (Chen & Li, 2017). The design rainstorm profile plays a vital role. Different rainstorm profiles will lead to significant differences in the calculation results of rainfall runoff (Jiang, 2015). Liuzhou has a mid-subtropical monsoon climate with a warm and rainy climate. It is a flood prone area, and flood prevention and waterlogging prevention are very important (Xie et al, 2018)
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