[1]ZHOU Jiaqi,CHEN Shifa.Analysis on Characteristics of Rainstorm in South China During the Previous Flood Season from 1951 to 201[J].Research of Soil and Water Conservation,2021,28(03):163-169.
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Analysis on Characteristics of Rainstorm in South China During the Previous Flood Season from 1951 to 201
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
28
Number of periods:
2021 03
Page number:
163-169
Column:
Public date:
2021-04-20
- Title:
- Analysis on Characteristics of Rainstorm in South China During the Previous Flood Season from 1951 to 201
- Keywords:
- Morlet wavelet analysis; M-K mutation; before the flood season; Pearson three frequency curve; Shaoguan City
- CLC:
- P426.616
- DOI:
- -
- Abstract:
- To study the characteristics of rainstorm in pre-flood period in South China on a long time scale, and to provide reference for the prediction and prevention of rainstorm in this area, based on the daily precipitation data of Shaoguan City from 1951 to 2018, we used M-K test method, Morlet wavelet analysis method and Pearson three-type frequency curve to study the variation trend, abrupt change point, periodic change rule and recurrence period of rainstorm of different grades in the pre-flood period(April to June)of Shaoguan City. The results show that: in 68 years, the average contribution rate of rainstorm in the pre-flood period was 27%, and the precipitation in the pre-flood period showed an obvious increasing trend; the abrupt transition years of the rainstorm grade were found in 1953, 1957, 2006 and 2015, and the UF curve of the rainstorm grade was greater than the U0.01 critical value, so the rainstorm grade increased in 1951 and 1952 and decreased significantly in 1960, 1961 and 1963 to 2018; the number of rainstorm days of different grades in the pre-flood season to Shaoguan City presented multiple cyclical patterns; the main fluctuation cycles of rainstorm days are 6 years, 8 years, 15 years and 22 years, while the main fluctuation cycles of rainstorm days are 4 years, 8 years, 15 years and 27 years; the occurrence probability of rainstorms with more frequency and less frequency was large. The study on the variation trend, abrupt change point, periodic change rule and recurrence period of rainstorm of different grades in the pre-flood period of Shaoguan City can provides the references for flood prevention, soil and water conservation and other work in Shaoguan City.
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Last Update:
2021-04-20