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[1]ZHAO Yu,MU Xing-min,JIANG Chong.Analysis on the Variation of Drought & Flood Grades from 1470 to 2008 in Lanzhou Area[J].Research of Soil and Water Conservation,2014,21(01):132-136,141.

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Analysis on the Variation of Drought & Flood Grades from 1470 to 2008 in Lanzhou Area

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 21 Number of periods: 2014 01 Page number: 132-136,141 Column: Public date: 2014-02-28

Title:: Analysis on the Variation of Drought & Flood Grades from 1470 to 2008 in Lanzhou Area

Author(s):: ZHAO Yu¹, MU Xing-min^1,2, JIANG Chong³; 1. Institute of Soil and Water Conservation, Chinese Academy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100, China;
2. College of Resource and Environment, Northwest A & F University, Yangling, Shaanxi 712100, China;
3. State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Global Change and Earth System Science, Beijing Normal University, Beijing 100875, China

Keywords:: climate change; drought; flood; period; Lanzhou area

CLC:: P426.616

DOI:: -

Abstract:: Drought and flood are the main natural disasters surrounding Lanzhou area. We described the variation characteristics of drought & flood grades of Lanzhou area from 1470 to 2008 by performing the manners of accumulative departure analysis, running T-test and Morlet wavelet analysis. Results showed that the drought & flood severity has 3 obvious drought stages and 4 flood stages nearly the 539 years. The frequency of drought is larger than flood. There are two abrupt changeson 100-year scale and 14 abrupt changes on decadal scale in Lanzhou area. Positive and negative phrase appear alternately during different time scales. The major cycles of drought & flood grades transformation are 108 years, 39 years and 13 years, respectively. With the rising temperatures and decreasing precipitation, the drought & flood had been showing the dry trend from 1951 to 2008.

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