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Université Catholique de Louvain

1. Bellal, Mourad. Fluvial Morphodynamics in super and transcritical flows : experimental and analytical approaches.

Degree: 2012, Université Catholique de Louvain

Usually, a fluvial regime prevails in alluvial rivers. The most drastic alterations in river morphology happen during floods and are thus associated with fast changes in discharge and water level, as well as intense erosion and deposition that may disrupt the river topography. Regime discontinuities may appear, such as hydraulic jumps and control sections, leading to transcritical flow. The present dissertation aims at modeling the morphodynamics of super- and transcritical flows using two complementary approaches: laboratory experiments and novel analytical solutions. Three series of experiments were conducted: (i) aggradation and degradation in supercritical flow under sediment overloading and underloading conditions, (ii) formation of a hydraulic jump over mobile bed and (iii) evolution of a critical section into a migrating knickpoint. Based on the linear diffusion model, the analytical solution for channels of finite length and fixed boundary conditions matching aggradation and degradation problems is well-known to admit general solutions, typically constructed using Fourier series. For moving boundary problems corresponding to transcritical flows, the problem is non-linear and the mathematical solution becomes more complex. This is the case for the prograding sediment front where the moving boundary travels in the donwstream direction, and for the case of the erosive knickpoint front where the boundary travels in the upstream direction, To address these problems, exact self-similar solutions have been derived by exploiting the symmetries of the diffusion equation. The results of the developed analytical approaches have been satisfactory compared to the experiments.

(FSA 3)  – UCL, 2012

Advisors/Committee Members: UCL - SST/IMMC/GCE - Civil and environmental engineering, Zech, Yves, Remacle, Jean-François, Berlamont, Jean, Hiver, Jean-Michel, Saores-Frazao, Sandra.

Subjects/Keywords: Transcritical flows; Aggradation; Degradation; Prograding delta; Knickpoint; Diffusion; Hydralic jump; Mobile bed

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Bellal, M. (2012). Fluvial Morphodynamics in super and transcritical flows : experimental and analytical approaches. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/114510

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Bellal, Mourad. “Fluvial Morphodynamics in super and transcritical flows : experimental and analytical approaches.” 2012. Thesis, Université Catholique de Louvain. Accessed September 19, 2020. http://hdl.handle.net/2078.1/114510.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Bellal, Mourad. “Fluvial Morphodynamics in super and transcritical flows : experimental and analytical approaches.” 2012. Web. 19 Sep 2020.

Vancouver:

Bellal M. Fluvial Morphodynamics in super and transcritical flows : experimental and analytical approaches. [Internet] [Thesis]. Université Catholique de Louvain; 2012. [cited 2020 Sep 19]. Available from: http://hdl.handle.net/2078.1/114510.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bellal M. Fluvial Morphodynamics in super and transcritical flows : experimental and analytical approaches. [Thesis]. Université Catholique de Louvain; 2012. Available from: http://hdl.handle.net/2078.1/114510

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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