Development of a meteorological and hydrological coupling index for droughts and floods along the Yangtze River valley of China |
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Authors: | , NIU Tao , WANG Jizhi , YANG Yuanqin , LIU Hongli , CHEN Miao , LIU Jiyan |
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Affiliation: | 1. Chinese Academy of Meteorological Sciences,Beijing,100081 2. Nanjing University of Information Science and Technology,Nanjing,210044 3. Yunnan University, Kunming 65009 |
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Abstract: | To comprehensively investigate characteristics of summer droughts and floods in the Yangtze River valley, a meteorological and hydrological coupling index (MHCI) was developed using meteorological and hydrological data. The results indicate that: (1) in representing drought/flood information for the Yangtze River valley, the MHCI can reflect composite features of precipitation and hydrological observations; (2) comprehensive analysis of the interannual phase difference of the precipitation and hydrological indices is important to recognize and predict annual drought/flood events along the valley; the hydrological index contributes more strongly to nonlinear and continuity features that indicate transition from long-term drought to flood conditions; (3) time series of the MHCI from 1960–2009 are very effective and sensitive in reflecting annual drought/flood characteristics, i.e. there is more rainfall or typical flooding in the valley when the MHCI is positive, and vice versa; and (4) verification of the MHCI indicates that there is significant correlation between precipitation and hydrologic responses in the valley during summer; the correlation coefficient was found to reach 0.82, exceeding the 0.001 significance level. |
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Keywords: | meteorological and hydrological coupling index (MHCI) Yangtze River valley recent 50 years drought and flood |
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