Publication Date:
2012-01-07
Description:
Changing trends of peak flood and flood duration in the Wujiang River Basin are detected with the help of the Mann-Kendall test and the Pettitt analysis during the past 50 years. Results indicate that the peak flood and the flood duration at Lishi Station have different changing features. The peak flood showed only marginally increasing trend, while the flood duration exhibited decreasing trend at the significance level of 90%. The result shows a weak positive correlation between the peak flood and the flood duration. The changes of flood duration are influenced by the total rainfall duration, which is in downward trend at significance level 90%. And the changing trends of peak flood are similar to the total rainfall amount. In the change point analysis, it was found that the change point for the peak flood and flood duration series were in the year of 1993 and 1966, respectively. The human activities such as construction of reservoirs were the main driving forces to cause the change of flood duration. The periodicity of the peak flood during period of 1955–2007 at Lishi Station is detected by using the wavelet analysis. The result indicates that the peak flood at Lishi Station displayed alternation between big floods and small floods on 25 to 26 year period. At the same time scale, the peak flood of Wujiang River showed an evidence of change between big floods and small floods. It was essential to be prepared and aware of the consequences of climate changes and human influences affecting the water resources in the Wujiang River Basin. This result is expected to draw more attentions from the local governments in its decision making and water resource management. Copyright © 2011 John Wiley & Sons, Ltd.
Print ISSN:
0885-6087
Electronic ISSN:
1099-1085
Topics:
Architecture, Civil Engineering, Surveying
,
Geography
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