[1]Ren Zikang,Zhao Huarong,Shi Kangming,et al.Spatial and Temporal Variation Characteristics of Precipitation Structure in Yunnan Province from 1961 to 2020[J].Research of Soil and Water Conservation,2024,31(02):168-180.
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Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
31
Number of periods:
2024 02
Page number:
168-180
Column:
Public date:
2024-03-20
- Title:
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Spatial and Temporal Variation Characteristics of Precipitation Structure in Yunnan Province from 1961 to 2020
- Author(s):
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Ren Zikang1, Zhao Huarong1,2,3, Shi Kangming1, Yang Guoliang1
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(1.College of Environmental Science and Engineering, Guilin University of Technology, Guilin, Guangxi 541006, China; 2.Collaborative Innovation Center for Water Pollution Control and Water Safety Assurance in Karst Areas, Guilin University of Technology, Guilin, Guangxi 541006, China; 3.Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, Guilin University of Technology, Guilin, Guangxi 541006, China)
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- Keywords:
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precipitation occurrence rate; precipitation contribution rate; inverse distance weighting method; innovation trend analysis; precipitation duration; precipitation grade; Yunnan Province
- CLC:
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P426
- DOI:
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- Abstract:
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[Objective] The aims of this study are to reveal the changes of precipitation structure in Yunnan Province in the last 60 years, to strengthen the monitoring and early warning of precipitation in Yunnan Province, and to provide scientific reference basis for the risk assessment of water and drought disasters in Yunnan Province. [Methods] Based on daily precipitation observation data from 32 meteorological stations in Yunnan Province, two indicators of precipitation occurrence and precipitation contribution were introduced, and the characteristics of spatial and temporal variation of precipitation structure under different precipitation durations and precipitation grades were explored by using innovative trend analysis(ITA), Mann-Kendall test and inverse distance weighting(IDW)method. [Results](1)The precipitation occurrence rate tended to decrease with the increase of precipitation calendar time, and the precipitation contribution rate tended to increase and then decrease, with short calendar time precipitation dominating in Yunnan Province. Spatially, the precipitation occurrence rate and contribution rate of short calendar period showed an overall decreasing trend from northeast to southwest, while the opposite was true for long calendar period.(2)As the precipitation level increased, the precipitation occurrence rate tended to increase and the precipitation contribution rate tended to increase and then decrease, with light rainfall dominating in Yunnan Province. Spatially, the occurrence rate of light rain was decreasing from north to south, while the occurrence rate of medium rain, heavy rain and heavy rain was the opposite trend. The contribution rate of light and moderate rainfall showed a decreasing trend from northwest to southeast, and the contribution rate of heavy and torrential rainfall showed the opposite trend compared with that of the light and moderate rainfall. The occurrence and contribution rate of heavy and torrential rainfall were higher in central, southern and southwestern Yunnan, which might cause higher risk of flooding.(3)Under different precipitation durations, the occurrence and contribution rate of precipitation at most stations in short durations were increasing with the increase of more than 5%, and in long durations were decreasing with a trend of more than 5%. Under different precipitation grades, the occurrence and contribution rate of light rainfall at most stations showed the decreasing trend within 10%, and the occurrence and contribution rate of heavy rainfall and storms showed the increasing trend above 5%. [Conclusion] In Yunnan Province, the probability of short-calendar-time heavy rainfall and storms had risen, and the chance of flooding and soil erosion in the region had increased, so the precipitation structure should be continuously monitored and researched in the future.