Application of Gumbel’s Distribution Method for Flood Frequency Analysis of Lower Ganga Basin (Farakka Barrage Station), West Bengal, India

Autor:	Kajal Kumar Mandal, K. Dharanirajan, Sabyasachi Sarkar
Rok vydání:	2021
Předmět:	Hydrology Gumbel distribution Flood frequency analysis Geography Planning and Development Earth and Planetary Sciences (miscellaneous) West bengal S distribution Environmental Science (miscellaneous) Structural basin Safety Risk Reliability and Quality Geology
Zdroj:	Disaster Advances. :51-58
ISSN:	2278-4543 0974-262X
DOI:	10.25303/148da5121
Popis:	The analysis of flood frequency will depend on the historical peak discharge data for at least 10 years. This study has taken into account peak annual maximum discharge data for 72 years (1949 to 2020). The discharge data was collected from the Farakka Barrage Gauging station (24°48'15.10" N and 87°55'52.70" E) situated in the upper part of lower Ganga basin. The flood frequency analysis of the lower Ganga basin’s upper portions has been carried out using Gumbel’s frequency distribution method. Gumbel’s method (XT) is a prediction analysing statistical approach. The discharge data was tabulated in descending order and rank has been assigned based on the discharge volume. The return period was calculated based on Weibull’s formula (P) for this analysis. The flood frequency data was plotted on a graph where X-axis shows the return period and the Yaxis is the discharge value. The R2 value of this graph is 0.9998 which describe Gumbel’s distribution method is best for the flood frequency analysis. The flood frequency analysis is an essential step to assess the flood hazard.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b6e13963633f9c66727abfca48874edf https://doi.org/10.25303/148da5121 Zobrazit plný text záznamu