Regional Flood Frequency Analysis Based on L-Moment Approach (Case Study West Azarbayjan Basins)

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Regional Flood Frequency Analysis Based on L-Moment Approach
(Case Study West Azarbayjan Basins)

 

Original Article, C18
Rostami, R
Journal. Civil Eng. Urban. 3(3):107-113 . 2013

ABSTRACT:Flood estimation with certain frequency is one of the fundamental factors for design of Hydraulic structures, Flood plain, River coastal stabling, Basin management, etc. Accurate estimation of flood frequency discharge increases safety of the structures. L-moment approach was used for flood frequency analysis in west Azarbayjan province basins. For identifying homogeneous regions, the Ward hierarchical cluster method was used. Site data were used for independent testing of the cluster of the station for homogeneity. The west Azarbayjan province divided to four regions. In these regions parameters of the regional frequency distribution were evaluated by L-moment ratios. The L-moment diagram, goodness of fit test, and plotting position methods were used for the selection of appropriate distributions. In west Azarbayjan, Generalized Pareto distribution for region A, Generalized extreme value, Pearson type III and Lognormal distributions for region B, Pearson type III, Lognormal, Generalized extreme value distributions for region C and Lognormal and Generalized extreme value distribution were appropriate for region D. The relative Root Mean Square Error (rRMSE) between observed and estimated data in all stations is small. Regional model evaluated for determination of flood discharge magnitude in different frequency by liner and multiple regression method.
Keywords: L-Moment, Regional Frequency, Azerbaijan, Homogeneity

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