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Comparative Study of Regional Frequency Analysis and Traditional At-Site Hydrological Frequency Analysis

State Key Laboratory of Hydraulic and Mountain River Engineering, College of Water Resources and Hydropower, Sichuan University, Chengdu 610065, China
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Water 2019, 11(3), 486; https://doi.org/10.3390/w11030486
Received: 1 February 2019 / Revised: 4 March 2019 / Accepted: 4 March 2019 / Published: 7 March 2019
(This article belongs to the Special Issue Flood Modelling: Regional Flood Estimation and GIS Based Techniques)
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Abstract

Hydrological frequency analysis plays an indispensable role in the construction of national flood control projects. This study selects the stations with the smallest and largest discordances in the nine homogeneous regions of Sichuan Province as the representative stations, and results obtained by regional frequency analysis are compared with those obtained by traditional at-site hydrological frequency analysis. The results showed that the optimal frequency distribution of each representative station obtained by traditional at-site hydrological frequency analysis and the ones of corresponding homogeneous regions obtained by regional frequency analysis were not necessarily consistent, which was related to the site and homogeneous regions. At the same time, there were also differences between the fitting of the theoretical rainstorm frequency curve obtained by the two methods and the observation. In general, in each homogeneous region, the results obtained by regional frequency analysis and traditional at-site hydrological frequency analysis at the stations with the largest frequency analysis were quite different. The design values obtained by the two methods were also increasingly different with the increase of the return period. The study has specific reflections on the differences between regional frequency analysis and traditional at-site hydrological frequency analysis. View Full-Text
Keywords: regional frequency analysis; Sichuan Province; hydrological frequency analysis; homogeneous region; maximum daily precipitation regional frequency analysis; Sichuan Province; hydrological frequency analysis; homogeneous region; maximum daily precipitation
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Li, M.; Li, X.; Ao, T. Comparative Study of Regional Frequency Analysis and Traditional At-Site Hydrological Frequency Analysis. Water 2019, 11, 486.

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