[1]MAO Ming-ce.The Multiple Scale Analysis of Wet and Drought Oscillation in Guanzhong Plain during Last Hundred Years[J].Research of Soil and Water Conservation,2010,17(03):40-43.
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The Multiple Scale Analysis of Wet and Drought Oscillation in Guanzhong Plain during Last Hundred Years
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
17
Number of periods:
2010 03
Page number:
40-43
Column:
Public date:
2010-06-20
- Title:
- The Multiple Scale Analysis of Wet and Drought Oscillation in Guanzhong Plain during Last Hundred Years
- Keywords:
- Guanzhong plain; wet and drought oscillation; standard precipitation index; empirical mode decomposition
- CLC:
- P426.616
- DOI:
- -
- Abstract:
- The sensitivity of standard precipitation index (SPI) of Xi’an to wet and drought events in Guanzhong plain is studied, combining with the index of wet and drought and flood disasters in the Guanzhong plain from 1926 to 2008, and the SPI of Xi’an is analyzed by empirical mode decomposition (EMD). The results show: in the last hundred years, wet and drought events described by SPI of Xi’an and flood records and wet and drought index match well, which indicates that the SPI is pretty sensitive to the wet and drought events in Guanzhong plain; the oscillation of SPI has multiple scale, major variations are 3～5 a and inter-decadal scale. The scale of 3～5 a indicates the normal state of flood, and shows the alternate of wet and drought suffers severe-moderate-severe procedure, and now is strong position, this means the alternate is unstable. The variations of inter-decadal scale show low-high-low circle, suggesting an alternate of drought-wet-drought, and indicates now is drought period, but there is a wet trend without pass the statistics test.
- References:
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