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[1]ZHEN Ying,LI Yongfei,HE Jing.Research on Characteristics of Precipitation Change and Drought and Flood in Ganzi Region of Northwest Sichuan Plateau[J].Research of Soil and Water Conservation,2019,26(06):191-197.

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Research on Characteristics of Precipitation Change and Drought and Flood in Ganzi Region of Northwest Sichuan Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 26 Number of periods: 2019 06 Page number: 191-197 Column: Public date: 2019-10-17

Title:: Research on Characteristics of Precipitation Change and Drought and Flood in Ganzi Region of Northwest Sichuan Plateau

Author(s):: ZHEN Ying¹, LI Yongfei², HE Jing³; 1. School of Geography & Resources Science, Neijiang Normal University, Neijiang, Sichuan 641199, China;
2. Hunan Provincial Key Laboratory of Ecological Tourism, College of Tourism & Management Engineering, Jishou University, Zhangjiajie, Hunan 427000, China;
3. School of Atmospheric Sciences, Chengdu University of Information Technology, Chengu 610225, China

Keywords:: northwest Sichuan Plateau; Ganzi; precipitation; drought and flood frequency

CLC:: P426.616

DOI:: -

Abstract:: In order to understand the situation of precipitation and drought and flood in northwest Sichuan Plateau, monthly precipitation data of 11 meteorological stations in Ganzi Prefecture from 1961 to 2017 were selected. We used the climate propensity index, M-K test, Morlet wavelet analysis, Z index method and GIS spatial analysis technology to examine the precipitation characteristics of Ganzi Prefecture and the spatiotemporal distribution patterns of drought and flood disasters. The results show that the annual precipitation in Ganzi Prefecture increased by 21.47 mm/decade over the past 57 years. The rainy season is summer, but the precipitation in the four seasons is increasing, of which the most significant increase in autumn precipitation is about 1.64 mm/decade. Affected by the factors such as topography, atmospheric circulation and monsoon, the overall trend of precipitation in Ganzi Prefecture is dry in northwest area and wet in southeast area, which will easily cause local meteorological and geological disasters. The Z index shows that floods in Ganzi Prefecture were more frequent than droughts, but the drought was more serious. The intensity of drought was weakened and the intensity of flood and waterlogging increased after the precipitation abruptly changed in 1986. With respect to the seasonal pattern, there were droughts in all seasons, but the drought was more severe in winter due to the less precipitation. In space, the floods gradually decreased from west to east, and the drought decreased from the northwest to the south-west and southeast to the northeast.

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