Application of Wavelet Fractal Dimension Estimation in Dividing Flood Stages for Three Gorges Reservoir |
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Authors: | Xue-shan AI Qian-jin DONG Xian-jia WANG Yan-min ZHANG |
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Institution: | 1. State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China;2. Institute of Design and Research, Wuhan University, Wuhan 430072, China |
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Abstract: | Limit water level control improves water resources utilization efficiency without reducing flood control standard, while the premise is to divide the discharge series into a number of different flood stages. Db4 is selected as wavelet base, based on Mallat algorithm, put forward the model of wavelet dimension estimation method and calculated the fractal dimension of floods at the Yichang station, got the flood periods of Three Gorges reservoir. The results indicate that the method of wavelet dimension estimation can obtain the same result as traditional methods, and it has the merit of simplicity and stability. As a feasible and effective tool, the wavelet dimension estimation method is recommended in the applications of dividing flood periods. |
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