[1]LIU Shenghong,LIU Huiying,LUO Ping,et al.Spatial and Temporal Distribution Characteristics of Rainfall of Different Magnitudes in Pingjiang Basin of Upper Ganjiang River in Recent 30 Years[J].Research of Soil and Water Conservation,2022,29(03):106-114.
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Spatial and Temporal Distribution Characteristics of Rainfall of Different Magnitudes in Pingjiang Basin of Upper Ganjiang River in Recent 30 Years
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
29
Number of periods:
2022 03
Page number:
106-114
Column:
Public date:
2022-04-20
- Title:
- Spatial and Temporal Distribution Characteristics of Rainfall of Different Magnitudes in Pingjiang Basin of Upper Ganjiang River in Recent 30 Years
- Keywords:
- rainfall of different magnitudes; hourly rainfall; spatiotemporal distribution; Pingjiang River Basin
- CLC:
- P426.6
- DOI:
- -
- Abstract:
- In order to study the temporal and spatial distribution characteristics of different magnitudes of rainfall in Pingjiang basin in the upper reaches of Ganjiang River under the influence of global warming, based on its hourly rainfall data from 1989 to 2018, Mann Kendall trend test method and Morlet wavelet analysis are used to analyze different magnitudes of rainfall on annual, seasonal, monthly and hourly scales. The results show that:(1)in the past 30 years, the proportions of light rain, moderate rain, heavy rain and excessive rain of annual rainfall were 18.64%, 29.76%, 29.70% and 21.90%, respectively; the rainfall mainly concentrated in spring and summer, and the peak values of light, moderate, heavy and excessive rain appeared in March, April, June and June, respectively, with a 100 year return period of 175.5 mm;(2)distribution characteristics of space was that excessive rainfall on each time scale were low in the south and high in the north of the basin, light rain and heavy rain were generally low in the west and high in the east of the basin, moderate rainfall was obviously different at different times scales;(3)the annual light and moderate rainfall showed a downward trend, the annual heavy rain and excessive rain showed an upward trend, the moderate rainfall in February and November showed a downward and upward trend, respectively, by passing the significance tests of 0.05 and 0.01, respectively;(4)the hourly rainfall increased with time from 09:00 to 06:00 the next day, and its spatial distribution and rainfall erosivity decreased from northeast to central and south China, and then increased to southwest, and its rain belt showed the characteristics of diffusion from the middle to both sides over time;(5)annual rainfall was affected by moderate and heavy rain the first and second main cycles were 26～27 years, 7～8 years, and the third main cycle was 4～5 years under the influence of the first main cycle of heavy rainfall. The uneven distribution of different magnitudes of rainfall in time and space had a trend towards extreme precipitation, and more attention should be paid to floods caused by heavy rain belt in the northern part of the basin in May and June.
- References:
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Last Update:
2022-04-20