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European Journal of Environmental Ecology

Volume 10, Issue 1, 2023
Mcmed International
European Journal of Environmental Ecology
Issn
XXX-XXXX (Print), 2393 - 9672 (Online)
Frequency
bi-annual
Email
editorejee@mcmed.us
Journal Home page
http://mcmed.us/about/ejee
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Abstract
Title
THE COMPARISON OF NORMAL, LOGNORMAL, LOG PEARSON TYPE III AND GUMBELL DISTRIBUTION FOR KRISHNA RIVER AND EVALUATION OF BEST DISTRIBUTION
Author
Khan Mujiburrehman
Email
mujibkhan87@gmail.com
keyword
Krishna River, Vijayawada station, Flood frequency, Gumbell distribution
Abstract
This paper presents a frequency distribution study on fitting of maximum monthly flood magnitude in Krishna River at Vijayawada station using widely used probability distributions for periods from 1901 to 1979. The Normal, Lognormal, Log Pearson type III and Gumbell distributions are proposed and tested together with their single distributions to identify the optimal model for maximum monthly flood. The model will be selected based on the maximum R2 value and GOF tests. The results indicated that all distributions give R2 value in the range of 0.95 to 1. However Gumbell distribution gives highest R2 value as 0.99. Gumbell value distribution can be used for frequency distribution of Krishna River. The results obtained shows that Gumbell distribution produces the flood magnitude slightly higher than other distributions. These results however can vary between the rain gauge stations which are strongly influenced by their geographical, topographical and climatic changes. The following study can be used by planning and designing engineers for designing the various hydraulic structures such as dam, bridges, spillways, canals and levees etc. The study further can be extended into flood forecasting and flood preparation of flood inundation maps.
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