Application of Regional Flood Frequency Analysis Based on L-moments in the Region of the Middle and Lower Yangtze River

摘要

The regional flood frequency analysis method based on L-moments proposed by Hosking in 1997 is applied to the flood frequency analysis of annual maximum flood volume for five hydrological stations ,including Yichang , Shashi, Hankou, Luoshan and Datong , in the middle and lower reaches of Yangtze river. The method of Hosking is a new one for Chinese traditional regional flood frequency analysis. The calculated results shows that the five stations could be considered as an homogenous region for frequency analysis, so the index-flood method is used to calculated design values for each station, and the Wakeby distribution is recommended to be population grow-curve (or distribution),because the other distribution, i.e., Pearson-III,GLO,GEV,GPA, and GLN are not accepted by the Z statistic test