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[1]SUN Wei,LIU Zhihong,LU Xiaoning,et al.Multiple Time-Scale Characteristics of Variations of Summer Precipitation in Different Landform Units in Sichuan Province from 1951 to 2016[J].Research of Soil and Water Conservation,2018,25(05):337-342.

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Multiple Time-Scale Characteristics of Variations of Summer Precipitation in Different Landform Units in Sichuan Province from 1951 to 2016

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 05 Page number: 337-342 Column: Public date: 2018-09-06

Title:: Multiple Time-Scale Characteristics of Variations of Summer Precipitation in Different Landform Units in Sichuan Province from 1951 to 2016

Author(s):: SUN Wei¹, LIU Zhihong¹, LU Xiaoning¹, ZHANG Juan¹, YE Bangping²; 1. Chengdu University of Information Technology, Chengdu 610225, China;
2. Sichuan Meteorological Observatory, Chengdu 610072, China

Keywords:: summer precipitation; multiple time scales; wavelet analysis; Sichuan Province; geomorphological unit

CLC:: P426.6

DOI:: -

Abstract:: The precipitation data of summer (June-August) in Sichuan Province from 1951 to 2016 were used to analyze the spatial distribution of summer average and summer mean precipitation in Sichuan Province using GIS technology. We analyzed the periodic and trendy characteristics of summer total precipitation under the geological features of Sichuan Province under the different geomorphic units (the high mountain plateau (Ganzi), the mountainous transitional zone to the basin (Guangyuan), the mid-low mountainous area (Yibin), the hilly low mountainous area in the central basin (Suining) and the plateau (Ya’an) by using wavelet analysis, linear trend coefficient. The results showed that the spatial distribution of average precipitation over the past 66 years in Sichuan Province was uneven; from the perspective of spatial distribution of average precipitation in summer, the spatial distribution of precipitation was not uniform; the trend of multi-year mean precipitation in summer was basically opposite to the topography, due to the combined effects of climate, water vapor source and topography, the higher the terrain was, the lower the precipitation was; the summer total precipitation changes in the mountainous plateau (Ganzi) and middle-low hills (Yibin) were rapidly rising and declining rapidly, the total summer precipitation change in the transition zone from the plateau (Guangyuan) to the edge of the basin to the basin (Ya’an) was slowly and rapidly decreasing, respectively; the summer total precipitation in the hill and hilly region of central basin (Suining) was slowly increasing. There are three scale periods for total precipitation in different geomorphic units in Sichuan Province in the recent 66 years:the main period of 20~47 years, the sub-periods of 2~13 year and 10~27 year, and the total summer precipitation of different geomorphic units in Sichuan began in 2008. The wet period still lasted after 2016.

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