Flood risk management in Allala River (Algeria) using Flood frequency analysis and hydraulic modeling

Boukhanef, Issam; Khadzhidi, Anna; Kravchenko, Lyudmila; Tsarev, Yuri; Сиротенко, А. Н.; Polushkin, Oleg

doi:10.1051/e3sconf/201913501093

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…Flood frequency analysis is used to relate the magnitude of floods to their frequency of occurrence using probability distribution methods. At present, there is no universally accepted frequency distribution model for frequency analysis of extreme floods, rather a whole group of models is considered (Izinyon and Ajumuka, 2013; Seckin et al , 2010; Ganamala and Kumar, 2017; Bhat et al , 2019; Issam et al , 2019).…”

Section: Methodsmentioning

confidence: 99%

Flood hazard mapping and analysis under climate change using hydro-dynamic model and RCPs emission scenario in Woybo River catchment of Ethiopia

Ukumo

Abebe

Lohani

et al. 2022

WJE

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Purpose The purpose of this paper is to prepare flood hazard map and show the extent of flood hazard under climate change scenarios in Woybo River catchment. The hydraulic model, Hydrologic Engineering Center - River Analysis System (HEC-RAS) was used to simulate the floods under future climate scenarios. The impact of climate changes on severity of flooding was evaluated for the mid-term (2041–2070) and long-term (2071–2100) with relative to a baseline period (1971–2000). Design/methodology/approach Future climate scenarios were constructed from the bias corrected outputs of five regional climate models and the inflow hydrographs for 10, 25, 50 and 100 years design floods were derived from the flow which generated from HEC-hydrological modeling system; that was an input for the HEC-RAS model to generate the flood hazard maps in the catchment. Findings The results of this research show that 25.68% of the study area can be classified as very high hazard class while 28.56% of the area is under high hazard. It was also found that 20.20% is under moderate hazard and about 25.56% is under low hazard class in future under high emission scenario. The projected area to be flooded in far future relative to the baseline period is 66.3 ha of land which accounts for 62.82% from the total area. This study suggested that agricultural/crop land located at the right side of the Woybo River near the flood plain would be affected more with the 25, 50 and 100 years design floods. Originality/value Multiple climate models were assessed properly and the ensemble mean was used to prepare flood hazard map using HEC-RAS modeling.

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Section: Methodsmentioning

confidence: 99%

Flood hazard mapping and analysis under climate change using hydro-dynamic model and RCPs emission scenario in Woybo River catchment of Ethiopia

Ukumo

Abebe

Lohani

et al. 2022

WJE

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“…Daily stream flow data from 1990 to 2009 was collected from the Ministry of Water, Irrigation, and Energy and was used to estimate flood frequency analysis (Getahun and Gebre 2015;Bhagat 2017). The discharge at the Baro-Gambella gauging station was computed for 25-, 50-, and 100year return periods (Issam et al 2019). The three flood frequency distributions used were selected to compute the discharges from various return periods and to calculate probability estimates for the likelihood of extreme events (Gumbel distribution, Normal distribution, and Log Pearson Type III distribution).…”

Section: Flood Frequency Analysismentioning

confidence: 99%

Inundation Mapping and Flood Frequency Analysis using HEC-RAS Hydraulic Model and EasyFit Software

Minywach,

Lohani,

Ayalew

2024

JWMM

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Conducting a flood frequency analysis and mapping of the inundated area in rivers are important for river flow modeling. The main purpose of this research is to estimate the peak flow, model the inundated area using HEC-RAS, and conduct an analytical hierarchy process for the upper Baro Akobo basin in Ethiopia. The inundation area and river depth for 25, 50 and 100 years are considered while contemplating several factors which contribute to flooding. The downstream of the basin has experienced numerous floods that occurred in 2006, 2007, 2010, 2011, and 2012. Flood frequency analysis with stream flow data from 1990–2009 at the Baro-Gambella gauging station was carried out to estimate the expected peak floods of the watershed. The analysis was conducted using the Gumbel, Normal, and Log Pearson Type III distribution methods. The peak floods with return periods of 25, 50, and 100 years with a minimum statistical value calculated using the Normal distribution method resulted in 1739.586 m3/s, 1820.872 m3/s, and 1893.974 m3/s, respectively. The HEC-RAS model results indicated that the flood inundation areas under different land use changes for 25-, 50-, and 100-year return periods were 446.2 km2 (annual crop cover), 404.4 km2 (built area cover), 323.3 km2 (flooded vegetation), and 93.58 km2 (forest area), respectively, whereas the inundation depth ranged from 0–2.6 m, 0–2.9 m, and 0–3.2 m depth at the upstream and downstream of the river, respectively. The outcome of this study could be used to reduce temporal and permanent flood risk.

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“…Natural factors determine the hydrological conditions for the formation of floods on rivers, on which the regime of water levels depends. The most significant influence of hydrology is expressed on small rivers with reduced capacity [1]. The characteristic elements of geomorphology and relief form zones of waterlogging and flooding along river banks, distorting the natural coastline of streams.…”

Section: Introductionmentioning

confidence: 99%

“…Natural and anthropogenic factors, acting on the agrolandscapes of the steppe river basins, accelerate the processes of soil erosion, which leads to an intense washoff of fine earth into river beds and baulks [12]. As a result, degradation of watercourses occurs, which causes change in the natural coastline, occurrence of emergency situations associated with floods [1,13]. It is necessary to restore water bodies from degradation.…”

Section: Introductionmentioning

confidence: 99%

Method of restorating water level of small rivers

et al. 2021

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The article presents method for restoring the water level of small rivers that are subjected to degradation on the example of section of the Meklet River. To assess the degradation of rivers, there is proposed method based on maintaining balance between bottom sediments removed from the riverbed and the water volume in the prism of coastal landscape flooding during high water. The methodology for calculating the amount of silt shifting can be used to monitor the state of river beds. When forming coastline on inconvenient coastal landscapes as enclosing structures, the method allows the use of flexible tanker shells filled with excavated bottom sediments.

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Flood risk management in Allala River (Algeria) using Flood frequency analysis and hydraulic modeling

Cited by 7 publications

References 8 publications

Flood hazard mapping and analysis under climate change using hydro-dynamic model and RCPs emission scenario in Woybo River catchment of Ethiopia

Flood hazard mapping and analysis under climate change using hydro-dynamic model and RCPs emission scenario in Woybo River catchment of Ethiopia

Inundation Mapping and Flood Frequency Analysis using HEC-RAS Hydraulic Model and EasyFit Software

Method of restorating water level of small rivers

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