郁江贵港水文站洪水频率分析研究

Flood frequency analysis for Guiwang Hydrological Station on Yujiang River

通过查阅历史文献、洪水调查成果,结合贵港站水文实测资料系列,制定贵港站Z^Q综合关系曲线多项式数学模型。参考南宁、贵港历史文献排位,结合实际发生洪水情况分析,确定郁江贵港站历史洪水的重现期,并对特大值作特殊处理,用皮尔逊Ⅲ型频率曲线进行流量频率适线,分析郁江贵港站洪水流量频率,用Z^Q数学模型推算贵港站的洪水水位频率,同时分析洪水位频率成果,对比分析,确定贵港站百年一遇的洪水水位为48 m。

Referring to historical documents and flood investigation results,combining with measurement records,Z^Q comprehensive relationship curve polynomial mathematical model was set up for Guiwang Hydrological Station.According to the ranking of reference historical documents of Nanning and Guigang,combining with actual flood situation,the flood recurrence period of Guigang station was confirmed after special treatment for extra high values.Flow frequency curve fitting was conducted with Pearson type III frequency curve,based on which the flood flow frequency of Guigang Station was analyzed.Flood level frequency of Guigang station was calculated and analyzed with Z^Q mathematical model.Based on comparison and analysis,the flood level of 100-year recurrence period is confirmed as 48 m at Guigang station.