Extreme rainfall has been frequent in recent years,leading to disasters such as urban flooding,flash floods and mudslides.Since long duration rainfall is often accompanied with large rainfall amount,its disaster causing ability cannot be ignored.The rainfall pattern has a large impact on the disasters caused by rainfall,and it is of great significance to carry out the research on rainfall pattern of long duration rainfall for disaster prevention and mitigation.Cangxi county in Sichuan Province is taken as the study area.Based on the hourly rainfall data at the Cangxi station from 2013 to 2022,33 long duration rainfall events are classified into 7 different rainfall patterns by using the integrated rain peak location co-efficients and the concentration trend indexes.And then the time-range distributions of each typical rainfall pattern are de-termined.The results show that the long duration rainfall in the region is mainly concentrated rainfall with peaks at the front or center,and the probability of scattered and uniform rainfall is small.The rainfall distribution of different rainfall types is obviously different in the early stage of the rainfall.So,it is possible to predict the rainfall types in the middle and early stages of the whole rainfall by combining the meteorological data,which can provide a scientific basis for the re-lated protection work.
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万方数据