Flood hazard map of the Becho floodplain, Ethiopia, using nonstationary frequency model

Tola, Sintayehu Yadete; Shetty, Amba

doi:10.1007/s11600-023-01074-9

Artykuł - szczegóły

Tytuł artykułu

Flood hazard map of the Becho floodplain, Ethiopia, using nonstationary frequency model

Autorzy

Tola Sintayehu Yadete , Shetty Amba

Wybrane pełne teksty z tego czasopisma

https://www.springer.com/journal/11600

Identyfikatory

DOI

10.1007/s11600-023-01074-9

Języki publikacji

Abstrakty

Flood estimates based on stationary flood frequency models are commonly used as inputs to flood hazard mapping. However, changing flood characteristics caused by climate change necessitate more accurate assessments of the probabilities of rare flood events. This study aims to develop a flood hazard map based on the nonstationary flood frequency using a generalized extreme value distribution model for the Becho floodplain in the upper Awash River basin. The distributional location parameter was modeled as a function of rainfall amount of different durations, annual total precipitation from wet days, yearly mean maximum temperature and time as covariates. The one-dimensional Hydrological Engineering Center River Analysis System (HEC-RAS) hydraulic model with steady flow analysis was used to generate flood hazard map input, depth and velocity, and inundation extent for different return periods. The result indicated that the model as a function of rainfall, such as monthly rainfall (August) and annual wet day precipitation, provided the best fit to the observed hydrological data. Rainfall as a covariate can explain the variation in the peak flood series. The developed hazard map based on depth alone and the combination of depth and velocity thresholds resulted in more than 70% of the floodplain area being classified as a high hazard zone under 2, 25, 50, and 100-years return periods. The current study assists water resource managers in considering changing environmental factors and an alternative flood frequency model for developing flood hazard management and mitigation strategies.

Słowa kluczowe

flood hazard flood frequency HEC-RAS Awash river basin nonstationary

zagrożenie powodziowe częstotliwość powodzi HEC-RAS dorzecze rzeki Awash

Wydawca

Instytut Geofizyki PAN
Springer

Czasopismo

Acta Geophysica

Rocznik

2024

Tom

Vol. 72, no. 2

Strony

1079--1095

Opis fizyczny

Bibliogr. 47 poz.

Twórcy

autor

Tola Sintayehu Yadete

sintayadete5@gmail.com

Faculty of Water Supply and Environmental Engineering, Arba Minch Water Technology Institute, Arba Minch University, PO. Box 21, Arba Minch, Ethiopia
Department Water Resources and Ocean Engineering, National Institute of Technology Karnataka, Srinivasnagar Surathkal, Mangalore, Karnataka 575025, India

https://orcid.org/0000-0003-4814-6386

autor

Shetty Amba

amba_shetty@yahoo.co.in

Department Water Resources and Ocean Engineering, National Institute of Technology Karnataka, Srinivasnagar Surathkal, Mangalore, Karnataka 575025, India

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Identyfikator YADDA

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