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You searched for +publisher:"Université Catholique de Louvain" +contributor:("Berlamont, Jean"). Showing records 1 – 3 of 3 total matches.

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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


Université Catholique de Louvain

2. Spinewine, Benoît. Two-layer flow behaviour and the effects of granular dilatancy in dam-break induced sheet-flow.

Degree: 2005, Université Catholique de Louvain

In case of exceptional floods induced by the failure of a dam, huge amounts of sediments may be eroded. This results in large-scale modifications of the valley morphology and may drastically increase the resulting damages. The objective of the research is to advance the understanding of sediment transport under dam-break flows. For such highly erosive and transient floods, it is crucial to account explicitly for sediment inertia, and therefore traditional "clear-water" modelling approaches are largely inappropriate. The present approach relies on a two-layer idealisation of the flow behaviour. Separating a clear-water flow region from the underlying sediment bed, the transported sediments are confined in a flow layer of finite thickness, endowed with its proper inertia, density and velocity. The thesis also pinpoints granular dilatancy as an essential mechanism of interaction between the layers. When passing from a solid-like to a fluid-like behaviour as they are entrained by the flow, the eroded sediment grains dilate along the vertical, and this generates vertical exchanges of mass and momentum that should be accounted for. The thesis proceeds first with experimental investigations. Laboratory dam-break waves are reproduced in a dedicated flume, exploring different bed configurations and sediment densities. Imaging observations are used to support the proposed phenomenological description of the flow. Within a shallow-water framework, theoretical and numerical endeavours are then developed to investigate the implications on the flow dynamics of the two essential contributions of the proposed description, i.e. the two-layer flow behaviour, and the effects of granular dilatancy.

(FSA 3) – UCL, 2005

Advisors/Committee Members: UCL - FSA/AUCE - Département d'architecture, d'urbanisme et de génie civil environnemental, Zech, Yves, Vanderburgh, David, Deleersnijder, Eric, Berlamont, Jean, Chaudhry, M Hanif, Guinot, Vincent.

Subjects/Keywords: Sediment transport; Geomorphic flood routing; Laboratory experiments; Two layer; Dilatancy; Shallow water; Dam break

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

APA (6th Edition):

Spinewine, B. (2005). Two-layer flow behaviour and the effects of granular dilatancy in dam-break induced sheet-flow. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/4999

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):

Spinewine, Benoît. “Two-layer flow behaviour and the effects of granular dilatancy in dam-break induced sheet-flow.” 2005. Thesis, Université Catholique de Louvain. Accessed September 19, 2020. http://hdl.handle.net/2078.1/4999.

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

MLA Handbook (7th Edition):

Spinewine, Benoît. “Two-layer flow behaviour and the effects of granular dilatancy in dam-break induced sheet-flow.” 2005. Web. 19 Sep 2020.

Vancouver:

Spinewine B. Two-layer flow behaviour and the effects of granular dilatancy in dam-break induced sheet-flow. [Internet] [Thesis]. Université Catholique de Louvain; 2005. [cited 2020 Sep 19]. Available from: http://hdl.handle.net/2078.1/4999.

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

Council of Science Editors:

Spinewine B. Two-layer flow behaviour and the effects of granular dilatancy in dam-break induced sheet-flow. [Thesis]. Université Catholique de Louvain; 2005. Available from: http://hdl.handle.net/2078.1/4999

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


Université Catholique de Louvain

3. Savary, Céline. Transcritical transient flow over mobile beds Boundary conditions treatment in a two-layer shallow-water model.

Degree: 2007, Université Catholique de Louvain

River dynamic behaviour is affected by variations both in the water phase and in the transported sediment phase. A change in the water regime may lead to significant morphological changes in the bed profile, which in turn may strongly influence the flow conditions. Transcritical flows over mobile beds are particularly challenging to model due to the rapid variation in space and time of the solid transport, and to the specific treatment required for boundary conditions. The one-dimensional numerical model presented in this dissertation divides the flow in two fully coupled layers: a water layer and a water-sediment transport layer. This model was initially designed to depict dam-break flows, which does not require a specific treatment of boundary conditions. An extension of the two-layer approach is proposed in order to properly take into account boundary conditions. The treatment of boundary conditions commonly relies on characteristics. Within a two-layer model, which embodies five governing equations, an appropriate eigenstructure analysis is developed based on numerical estimations. This novel approach results in a new characterization of the critical stage by defining a specific two-layer Froude number. The model is compared to the classical Saint-Venant - Exner approach and favourably applied to several typical situations: uniform flow, which allows a straightforward calibration of the model parameters; regressive erosion around a mild-to-steep slope transition; evolution of a mobile bed under a hydraulic jump; and scour hole formation downstream of a fixed bed.

(FSA 3) – UCL, 2007

Advisors/Committee Members: UCL - FSA/AUCE - Département d'architecture, d'urbanisme et de génie civil environnemental, Zech, Yves, Altinakar, Mustafa, Hiver, Jean-Michel, Berlamont, Jean, Vanderburgh, David, Soares Frazão, Sandra, Thimus, Jean-François, Cardoso, António.

Subjects/Keywords: Boundary conditions; Non-equilibrium sediment transport; Two-layer shallow-water model; Characteristics; Transcritical flow

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

APA (6th Edition):

Savary, C. (2007). Transcritical transient flow over mobile beds Boundary conditions treatment in a two-layer shallow-water model. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/5001

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):

Savary, Céline. “Transcritical transient flow over mobile beds Boundary conditions treatment in a two-layer shallow-water model.” 2007. Thesis, Université Catholique de Louvain. Accessed September 19, 2020. http://hdl.handle.net/2078.1/5001.

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

MLA Handbook (7th Edition):

Savary, Céline. “Transcritical transient flow over mobile beds Boundary conditions treatment in a two-layer shallow-water model.” 2007. Web. 19 Sep 2020.

Vancouver:

Savary C. Transcritical transient flow over mobile beds Boundary conditions treatment in a two-layer shallow-water model. [Internet] [Thesis]. Université Catholique de Louvain; 2007. [cited 2020 Sep 19]. Available from: http://hdl.handle.net/2078.1/5001.

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

Council of Science Editors:

Savary C. Transcritical transient flow over mobile beds Boundary conditions treatment in a two-layer shallow-water model. [Thesis]. Université Catholique de Louvain; 2007. Available from: http://hdl.handle.net/2078.1/5001

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

.