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| Titel |
The variation of floods in the middle reaches of the Yangtze River and its teleconnection with El Niño events |
| VerfasserIn |
Y.-J. Wu, W. A. Gough, T. Jiang, H.-T. Kung |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7340
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| Digitales Dokument |
URL |
| Erschienen |
In: 1st Alexander von Humboldt International Conference ; Nr. 6 (2006-02-06), S.201-205 |
| Datensatznummer |
250003259
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| Publikation (Nr.) |
 copernicus.org/adgeo-6-201-2006.pdf |
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| Zusammenfassung |
| Middle reaches of the Yangtze River are the worst flooded segments along the
Yangtze River. It is important to understand and study the variations of
frequency and magnitude of historical floods in this area and how were they
related to or affected by EI Niño in a long historical period. We applied the
statistics and time series to study and analyze historical floods (1470-2000)
and EI Niño events (1525-1995). The results show that the more floods occurred
in the latest 200 years. The power-spectral analysis suggests the main cycle of
flood variation is longer than that of EI Niño events. El Nino shows the fluctuations
of about 2-year and 3~4 year period while the flood variation is not so significant
but can also be identified in the period of 2, 8 and 40 years (it exceeds the level
of confidence 0.03). Time series analyses of the fluctuation of flood and El Nino
indicate that there is a significant correlation between the two at both high and
moderate frequency sections. The result shows that the response of the floods
along the middle reaches of the Yangtze River to the effects of El Nino events
is not only delayed one or more than one year as suggested by many Chinese
scientists, but it also can be somewhat longer delayed up to about 8 years.
The result also indicates that the shorter the interval of EI Niño events,
the sooner the flood events follows. In other words, flood could be delayed
with longer time if the interval time of EI Niño events is longer. |
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