[1]ZHANG Shan,YANG Shuwen,WANG Hengliang.Spatiotemporal Variation of Rainfall for Different Categories in Lanzhou During 1965-2015 Considering Loess Landslide[J].Research of Soil and Water Conservation,2019,26(01):184-191.
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Spatiotemporal Variation of Rainfall for Different Categories in Lanzhou During 1965-2015 Considering Loess Landslide
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
26
Number of periods:
2019 01
Page number:
184-191
Column:
Public date:
2019-02-28
- Title:
- Spatiotemporal Variation of Rainfall for Different Categories in Lanzhou During 1965-2015 Considering Loess Landslide
- Keywords:
- loess landslide; rainfall categories; Mann-Kendall test; moving t-test; Morlet wavelet transformation
- CLC:
- P626.61
- DOI:
- -
- Abstract:
- Rainfall is the key factor causing the disaster of loess landslide. Rainfall for different categories and its spatiotemporal variation affected the occurrence and development of loess landslides. Based on daily precipitation data from 1965 to 2015 of Lanzhou, we analyzed rainfall for different categories including rain days, precipitation and precipitation contribution rate, used Mann-Kendall test, moving t-test and Morlet wavelet transformation to get its abrupt change, trend, periodicity and spatial distribution in the study. It provided data support for research on loess landslide paroxysmal disaster. The results indicated that the rainfall events were characterized as light drizzle, light rain and moderate rain in Lanzhou; and the rainfall and the number of rainfall days were all abrupt, and the mutation time is different. The overall annual rainfall was on the rise, consistent with the trend of moderate rainfall. In the past 50 years, there were obvious multi-time-scale periodic oscillations of rainfall; and the variation period of the number of rainfall days was 8-year, and the next few years would be abundant rainfall. The annual rainfall declined overall, and its climate tendency was -4.96 mm/decade. In the spatial distribution, the number of annual rainfall days showed ‘two more and two less’, and precipitation showed ‘two less and two more’, and the degree of rain events of different grades had different impacts on rainfall in different areas. Analysis on the rainfall and loess landslide showed that rainfall played an important role in inducing landslide in Lanzhou.
- References:
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