M. MEZBACHE Salheddine

MCB

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Department

BASE COMMON ST Departement ST

Research Interests

hydraulics modeling sediment transport and floods prediction numerical modeling

Contact Info

University of M'Sila, Algeria

Email : salheddine.mezbache@univ-msila.dz

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Recent Publications

2021

Couplage de modèles 1D et 2D pour l’étude du transport sédimentaire en rivière et cours d’eau lors des crues

This study deals with one-dimensional, two-dimensional hydro-sedimentary numerical modeling and the coupled modeling of the 1D hydro-sedimentary model to a 2D hydrosedimentary model in rivers and streams. First, we show the theoretical basis. Next, the RubarBE, Rubar 20TS and Coupling codes of INRAE-Lyon are described, which are used to perform the 1D, 2D and coupling simulations respectively. The use of explicit numerical schemes permits to treat the cases in which the boundary becomes dry or wet without stability problems. These codes use mean diameter and standard deviation to represent sediment transport which simplifies the study. They give many results like: the maximum water depths or the limit of a flood, the longitudinal and transverse evolution of the river bed and its floodplain, flow discharge, sediment discharge, velocities, diameters evolution, etc. . In general, the results of the various modelizations are similar. The coupled model is stable even in the event of generalized overflow on the banks or through the dike breach. For lateral coupling, the coupled model saves computation time compared to a 2D model and provides valuable results concerning the flood characteristics as well as the evolution of the topography of the bed. However, the similar simplified representation of the sediment characteristics in the 1-D and 2-D models, revealed deviations in the case of the upstream / downstream coupling which takes place at a cross section perpendicular to the flow direction, because the assumption of homogeneous velocity and concentration is not valid for estimating sediment transport this time. Further research is needed to be able to define an appropriate sediment distribution for the 2D side of the boundary between the two models.
Citation

M. MEZBACHE Salheddine, (2021), "Couplage de modèles 1D et 2D pour l’étude du transport sédimentaire en rivière et cours d’eau lors des crues", [national] University of M'sila

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2020

Comparing 2-D and 1-D/2-D modelling of Agly River bed change during a flood

The authors discuss the use of a 1-D model or a 2-D model for the evolution of the bed between the levees while the spreading of water and sediment over the floodplains is sim-ulated using a 2-D model. A 1-D model cannot represent the asymmetrical behaviour of the flow in the bends but makes easier the estimate of the variations of the sediment transport capacity along the river if the bed geometry is complex. For the case of the Agly river floods, results in terms of water elevation and bed evolution are compared for a sim-plified geometry of the bed. The two models (coupled 1-D/2-D or full 2-D) provide quite similar processes in the flood plain but different erosion rates of the main channel bed. Because differences of both results to observations are large, one cannot decide which model provides the more relevant results
Citation

M. MEZBACHE Salheddine, (2020), "Comparing 2-D and 1-D/2-D modelling of Agly River bed change during a flood", [international] River Flow 2020 , Delft Netherlands

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A coupled 1-D/2-D model for simulating river sediment transport and bed evolution

The paper details the method to couple a 1-D hydro-sedimentary model to a 2-D hydro-sedimentary model in order to represent the hydrodynamics and morphological processes during a flood event along a river. Tested on two field cases, the coupled model is stable even in the case of generalized overflow over the riverbanks or of levee breaching. For lateral coupling, the coupled model allows saving computational time compared to a full 2-D model and to provide valuable results concerning the flooding features as well as the evolution of the bed topography. However, despite a similar simplified representation of the sediment features in the 1-D and 2-D models, some discrepancies appear in the case of upstream/downstream coupling along a cross section perpendicular to the flow direction because the assumption of homogeneous velocity and concentration is not valid for estimating sediment transport. Further research is necessary to be able to define a suitable distribution of the sediments on the 1-D side of the boundary between the two models.
Citation

M. MEZBACHE Salheddine, (2020), "A coupled 1-D/2-D model for simulating river sediment transport and bed evolution", [national] Journal of Hydroinformatics , IWA Publishing

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2019

Modélisation hydrosédimentaire de la basse plaine de l’Agly

La basse plaine de l'Agly est constituée par les alluvions apportés par le fleuve au fil des siècles. L'endiguement du fleuve dans sa partie la plus aval dans la seconde moitié du vingtième siècle a réduit l'apport massif de sédiments au lit majeur. Malgré la présence d'un barrage à l'amont, des volumes importants de sédiments sont encore apportés et doivent transiter jusqu'à la mer. Pour comprendre l'importance relative des différents processus en oeuvre dans la basse plaine et la répartition des sédiments entre les différentes zones de dépôt potentiels, une modélisation numérique du transport de sédiments a été effectuée. Deux événements de crue sont examinés : la crue de 1992 et la crue de 1999 pendant laquelle les endiguements se sont rompus. En alternative à l'utilisation d'un modèle hydrosédimentaire bidimensionnel adapté à la simulation de dépôts sur la plaine alluviale, un modèle couplé 1D/2D est proposé : la modélisation unidimensionnelle du lit endigué peut être une alternative efficace (elle évite un maillage fin du lit mineur) si elle réussit à transcrire l'évolution dissymétrique de la géométrie du lit dans les courbes, la modélisation bidimensionnelle restant indispensable pour simuler l'étalement des sédiments déposés sur le lit majeur. La comparaison entre les deux types de modélisation pour différentes valeurs des paramètres sédimentaires permet à la fois d'évaluer l'intérêt de cette modélisation couplée et d'identifier l'importance des crues rares dans l'évolution du lit prévisible à long terme.
Citation

M. MEZBACHE Salheddine, (2019), "Modélisation hydrosédimentaire de la basse plaine de l’Agly", [international] Conference: Rencontres SHF - Changement global et morphodynamique des rivières, des bassins versants à la mer , Paris

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