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降雨极值研究对工程水文设计及防洪减灾具有重要意义。该文分别采用Spearman秩次相关检验法、秩和检验法和小波分析法对石壁水库流域不同时段的降雨极值进行趋势性、跳跃性和周期性分析,反映流域降雨极值的统计规律。分析结果表明,石壁水库流域所选时段的降雨极值不存在明显的变化趋势,但有时段存在突变,主周期和次主周期分别为10-12年和3-4年。
The research of rainfall extreme value is of great significance to engineering hydrological design and flood control and disaster reduction. In this paper, we use Spearman rank correlation test, rank sum test and wavelet analysis respectively to analyze the trend, jump and periodicity of rainfall extreme values in different periods of the Shibi reservoir basin, and reflect the statistical laws of rainfall extreme values in the basin. The analysis results show that there is no obvious change tendency of the rainfall extremes in the selected period of the Shibi reservoir basin, but there are some sudden changes in the periods. The main and minor main periods are 10-12 years and 3-4 years respectively.