Cartography of flood hazard by overflowing rivers using hydraulic modeling and geographic information system: Oued El Harrach case (North of Algeria)

Abstract

El objeto de este estudio es la gestión del riesgo de inundaciones mediante el uso de cartografía de riesgo de inundaciones por ríos caudalosos. La cartografía se obtiene mediante aplicaciones de simulación modernas, como el modelo hidráulico (HEC- RAS) y la aplicación informática de Sistemas de Información Geográfica (SIG) ArcGis. El estudio se aplica en los alrededores de Oued El Harrach (norte de Argelia), objeto de varias inundaciones que han generado pérdidas humanas y materiales considerables. Estas pérdidas son consecuencia del uso de zonas inundables como zonas residenciales, pudiendo evitarse en el futuro en la zona de Oued El Harrach con la ayuda de cartografía del alcance espacial de los riesgos de inundación. Por ello la importancia de la cartografía desarrollada en este estudio como herramienta esencial para los gestores en prevención y protección en materia de riesgos de inundaciones.

Use of 1D Unsteady HEC-RAS in a Coupled System for Compound Flood Modeling: North Carolina Case Study

“…For the intermediate river model, we used the Hydrologic Engineering Center River Analysis System (HEC-RAS) developed by the Hydraulic Engineering Center of the Army Corps of Engineers [44]. HEC-RAS is a popular model for the prediction of river flooding and has been used extensively throughout the United States and abroad for assessing the behavior of rivers during high-flow events [7,22,45], flood inundation mapping [46], flash flood prediction [47], and many other applications. HEC-RAS can be run in either 1D or 2D mode, although the latter is a relatively recent addition, so 1D studies dominate the historical floodplain mapping literature.…”

Flooding vulnerability in Algiers (Algeria): an analytic hierarchy process

“…In this context, this paper aims to identify the ood-prone zones in the department of Algiers for better crisis prevention and management and improve the capital's territory development strategies. To our knowledge, this is the rst attempt to draw a vulnerability map with acceptable accuracy, as previous studies only focused on ood causal factors separately or on speci c wadis (Astite et al 2015;Boughedir 2015;Hafnaoui et al 2020;Korichi et al 2016). Using GIS (Geographic Information Systems), a multicriteria analysis (the Analytic Hierarchy Process) was used to assess Algiers' various levels of vulnerability to ooding ( ve levels, from very low to very strong).…”

Flood Analysis and Mitigation Strategies in Algeria

“…Several studies have been carried out with the aim of generating flood risk maps based on hydrological and hydraulic simulation (Astite et al 2015;Yamani et al 2016;Abdessamed andAbderrazak 2019 andHafnaoui et al 2020) or hydrogeomorphological approach (Cheikh lounis et al 2015;ZaÏri 2018;Mimouni et al 2019;Bourenane et al 2019). By using PLUTON as a hydrological model and HecRas for flood simulation, Astite et al (2015) delimitated flood risk areas in El Harrach river, the most important in Algiers city. Several flooding events resulting from the growth of the population and municipalities expansion over the natural space of El-Harrach River, have been identified in this coastal region.…”

“…Results showed that for 100-years floods there are some overflows, although the measures given remain insufficient for 1000-years. Both studies (Astite et al 2015 andAbdessamed andAbderrazak 2019) were focused on the frequency related to return periods to indicate flooded zones, furthermore, Hafnaoui et al (2020) have proposed a system based on the suggested values of rainfall. (40, 60, 80, and 100 mm) to identify flood-prone zones.…”