寒溪河流域降雨特征时空变化分析研究

Analytical Study on the Temporal and Spatial Variation of Rainfall Characteristics in the Hanxi River Basin

摘要: 利用Mann-Kendall、Pettitt及Morlet小波分析等多种检验方法，对寒溪河流域雨及流域内6个雨量站年降雨系列变化特征进行分析。结果表明：流域内常平站和同沙站年降雨序列呈显著上升趋势，松木山站年降雨序列略呈下降趋势，流域雨、石龙站、上村站、黄牛埔站呈不显著上升趋势。流域雨及流域内6个雨量站年降雨序列突变点均不显著，石龙站、上村站、松木山站和常平站对应突变点集中在2004年。石龙站年降雨第一主周期为33年，其他5个站点年降雨第一主周期均为6年。流域降雨空间分布规律为由南向北递减，由西向东递减，流域内中下游年降雨增加趋势明显，在未来防洪排涝规划中应予以考虑，进一步提升寒溪河流域洪涝灾害防御能力。

Abstract: The Mann-Kendall, Pettitt, Morlet wavelet and other relevant analysis test methods were used to study the spatial and temporal variation rules of rainfall characteristics at six gauged stations in the Dongguan Han-xi River basin. The results show that the annual rainfall series of Changping and Tongsha stations show a significant upward trend, the annual rainfall series of Songmushan station shows a slight downward trend, and the rainfall of the basin in Shilong, Shangcun, and Huangnupu stations shows a non-significant upward trend. The rainfall in the basin and the mutation points of the annual rainfall series at the six stations are not significant, and the corresponding mutation points at Shilong, Shangcun, Songmushan and Changping stations are concentrated in 2004. The first major cycle of annual rainfall at Shilong station is 33 years, while the first major cycle of annual rainfall in the basin and other five stations is 6 years. The spatial dis-tribution pattern of rainfall in the basin is decreasing from south to north and from west to east. The in-creasing trend of annual rainfall in the middle and lower reaches is obvious and should be taken into ac-count in future flood defense and drainage planning to further enhance the disaster flood defense capabil-ity of the Hanxi River basin.