LL-moments for estimating low flow quantiles / Estimation des quantiles d'étiage grâce aux LL-moments |
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| Authors: | M BAYAZIT B ÖNÖZ |
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| Institution: | Division of Hydraulics, Civil Engineering Faculty , Istanbul Technical University , Istanbul, 80626, Turkey E-mail: mbayazit@itu.edu.tr |
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| Abstract: | Abstract A parameter estimation method is proposed for fitting probability distribution functions to low flow observations. LL-moments are variants of L-moments that are analogous to LH-moments, which were defined for the analysis of floods. LL-moments give higher weights to the small observations. Expressions are given that relate them to the probability distribution function for the case of normal, Weibull and power distributions. Sampling properties of the LL-moments and of the distribution parameters and quantiles estimated by them are found by a Monte Carlo simulation study. It is shown on an example that the low flow quantile estimates obtained by LL-moments may be significantly different from those obtained by L-moments. |
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| Keywords: | LL-moments L-moments low flow lower tail estimation |
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