چکیده مقاله
Flood frequency analysis is essentially a problem of information scarcity in arid and semi arid regions Particularly in three regions, the lengths of records are usually too short to ensure reliable quantile estimates Regional flood frequency analysis RFFA involves two major steps: 1 Grouping of sites into homogenous regions, and 2 Regional estimation of flood quantiles at the site interest The main objectives of this study were to estimate regionalized parameters and indentification of the best fit distribution by L moments approach in several gauging stations In central Iran After determination of main influencing variables by factor analysis discordancy and homogeneity tests were done by L moment –based measures In this study, five three parameter distributions generalized logistic GLO , generalized extreme value GEV , generalized pareto GPA , three – parameter lognormal LN3 , and pearson type III PE3 were fitted to the two homogeneous regions The three parameters of these distributions are estimated by the L moments approach The results of factor analysis showed that length of main waterway ompactness coefficient , mean annual precipitation , and mean annual temperature were the main variables affecting on flood magnitude The study area was divided into two regions based on the Ward’s method The results of goodness –of fit analysis for the two regions indicates that the GEV LN3 for the regions 1 and 2 give acceptably close fits to the regional average L momets In general, the GEV distribution could be adopted as the appropriate distribution for the study area
کلیدواژهها
نویسندگان
Hossein Maleki-Nezhad
Assistant professor
شیوه ارجاع
Maleki-Nezhad, Hossein,1385,Regional flood frequency analysis using L-moment approach,7th International Congress on Civil Engineering,Tehran
ارائهشده در
مجموعه مقالات هفتمین کنگره بین المللی مهندسی عمران17 اردیبهشت 1385 · تهران