| Variation of drought and flood frequency in Siping region in the past 50 years |
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| DOI：10.7606/j.issn.1000-7601.2017.04.43 |
| Key Words: Siping region flood and drought frequency W index wavelet analysis method |
| Author Name | Affiliation | | ZHENG Lei | Siping Meteorological Bureau of Jilin Province, Siping, Jilin 136000, China | | WANG Jia-nan | Siping Meteorological Bureau of Jilin Province, Siping, Jilin 136000, China | | WEI Ting-ting | Siping Meteorological Bureau of Jilin Province, Siping, Jilin 136000, China | | LIU Shuang | Songyuan Meteorological Bureau of Jilin Province, Songyuan, Jilin 138000, China |
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| Abstract: |
| Based on the calculation of the drought-flood index (Z index, W index) with the daily precipitation data of 5 meterological stations, the variation of drought-flood in Siping region was analyzed by the linear trend method and wavelet analysis method. The results showed that the W index data was in a weak downward trend in the Siping during the past 54 years, and exhibited alternating drought and flooding. The extreme drought year of W index corresponded to the precipitation anomaly year. These two had consistency and W index might well reflect the flood/drought rules of Siping region. The drought parameter W tends to decreased at a rate of 3.68·10a-1, while it tends to increased significantly at the rate of 3.89·10a-1 in spring, and 10.183·10a-1 in winter. Each season has a different oscillation period and distinguished feature according to the result of the wavelet analysis method. |
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