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汛限水位分期控制能在不降低水库防洪标准的条件下提高水能资源利用效率,而洪水分期是汛限水位分期控制的前提.以三峡水库洪水资源高效利用为背景,在分析三峡水库上下游水文气象特征的基础上,根据水文序列的自相似性,由统计分析法确定了宜昌站洪水分期数目,并选择Db4为小波基,以Mallat算法为基础,提出了小波分维估计法计算模式并计算了宜昌站各分期的分维数,最后确定了三峡水库的汛期洪水分期。结果表明,以小波分维估计法划分的洪水分期与传统研究分期结果一致,但小波分维估计法计算简便,所得分维数结果稳定,表明小波分维估计法应用于洪水分期是可行的和有效的.
Flood staged water level control can improve the utilization efficiency of hydropower resources without reducing the reservoir flood control standards, and flood staging is the precondition of staging control of flood limited water level.Taking the efficient utilization of flood resources of the Three Gorges Reservoir as an example, Based on the self-similarity of hydrological sequences, the number of flood stages of Yichang station was determined by statistical analysis and Db4 was chosen as wavelet basis. Based on the Mallat algorithm, the calculation model of wavelet fractal dimension estimation method The fractal dimensions of each staging of Yichang station are calculated, and finally the flood staging of the Three Gorges Reservoir is determined. The results show that the flood staging by wavelet fractal dimension estimation method is consistent with the traditional staged results, but the wavelet fractal dimension estimation method is simple and the result is stable. It shows that the wavelet fractal dimension estimation method is feasible and suitable for flood staging Effective.