eprintid: 974
rev_number: 7
eprint_status: archive
userid: 7
dir: disk0/00/00/09/74
datestamp: 2024-03-18 00:34:03
lastmod: 2024-03-18 00:34:03
status_changed: 2024-03-18 00:34:03
type: article
metadata_visibility: show
creators_name: Vivekanandan, N.
title: Comparison of Generalized Extreme Value, Log Normal and Weibull Distributions for Assessment of Low-Flow
ispublished: pub
subjects: TA
divisions: j6
full_text_status: public
keywords: Chi-Square, Correlation Coefficient, Low-flow, Generalized Extreme Value, Kolmogorov-Smirnov, L-Moments, Log Normal, Root Mean Squared Error, Weibull
abstract: Assessment of low-flow is an important aspect for water quality management, reservoir storage design, determining minimum release policy and safe surface water withdrawals. For which, the annual minimum d-day average flow is generally adopted procedure for characterizing the low-flow in a stream, which can be obtained by averaging the flow using moving average method for ‘d’ consecutive days viz., 7-, 10-, 14- and 30- days. This paper presents a study on comparison of three probability distributions such as Generalized Extreme Value, 2-parameter Log Normal (LN2) and Weibull adopted in estimation of low-flow for river Cauvery at Kollegal gauging site. The parameters are determined by three methods viz., method of moments, maximum likelihood method and L-Moments (LMO), and are used for estimation of low-flow. The adequacy of fitting probability distributions adopted in low-flow frequency analysis is evaluated by quantitative assessment through Goodness-of-Fit (viz., Chi-Square and Kolmogorov-Smirnov) and diagnostic (viz., correlation coefficient and root mean squared error) tests, and qualitative assessment using the fitted curves of the estimated low-flow. The results of quantitative and qualitative assessments indicate that LN2 (LMO) is better suited amongst three distributions adopted in estimation of 7-, 10-, 14- and 30- day low-flows for river Cauvery at Kollegal site.
date: 2021-07-25
publication: Journal of Civil Engineering and Urbanism
volume: 11
number: 4
publisher: Scienceline Publication, Ltd
pagerange: 34-41
id_number: doi:10.54203/jceu.2021.5
refereed: TRUE
issn: 22520430
official_url: https://doi.org/10.54203/jceu.2021.5
citation:    (2021)     Comparison of Generalized Extreme Value, Log Normal and Weibull Distributions for Assessment of Low-Flow.   Journal of Civil Engineering and Urbanism.  pp. 34-41.  ISSN 22520430   
document_url: http://eprints.science-line.com/id/eprint/974/1/JCEU%2011%284%29%2034-41%2C%202021.pdf