Capítols de llibre
http://hdl.handle.net/2117/5766
2021-12-05T05:39:04ZKm-scale shoreline sand waves in the Western Mediterranean Sea
http://hdl.handle.net/2117/100709
Km-scale shoreline sand waves in the Western Mediterranean Sea
Falqués Serra, Albert; Ribas Prats, Francesca
A number of morphodynamic models have been developed to simulate the dynamics of large-scale bedform patterns on the continental shelf. Most of the models are based on linear stability analysis and, therefore, only describe the characteristics of the bedforms at their formation. Apart from studying the principal formation mechanism, the models have take into account various processes (three dimensional flows, sediment sorting, wave stirring, different tidal constituents, etc) to describe the characteristics of the bedforms at specific locations. Exploration of the finite amplitude regime have also been made with simplified models. Future model developments are needed to explore long-term dynamics.
2017-02-08T15:43:14ZFalqués Serra, AlbertRibas Prats, FrancescaA number of morphodynamic models have been developed to simulate the dynamics of large-scale bedform patterns on the continental shelf. Most of the models are based on linear stability analysis and, therefore, only describe the characteristics of the bedforms at their formation. Apart from studying the principal formation mechanism, the models have take into account various processes (three dimensional flows, sediment sorting, wave stirring, different tidal constituents, etc) to describe the characteristics of the bedforms at specific locations. Exploration of the finite amplitude regime have also been made with simplified models. Future model developments are needed to explore long-term dynamics.Km-scale shoreline sand waves
http://hdl.handle.net/2117/100708
Km-scale shoreline sand waves
Falqués Serra, Albert; Ribas Prats, Francesca
A number of morphodynamic models have been developed to simulate the dynamics of large-scale bedform patterns on the continental shelf. Most of the models are based on linear stability analysis and, therefore, only describe the characteristics of the bedforms at their formation. Apart from studying the principal formation mechanism, the models have take into account various processes (three dimensional flows, sediment sorting, wave stirring, different tidal constituents, etc) to describe the characteristics of the bedforms at specific locations. Exploration of the finite amplitude regime have also been made with simplified models. Future model developments are needed to explore long-term dynamics.
2017-02-08T15:20:19ZFalqués Serra, AlbertRibas Prats, FrancescaA number of morphodynamic models have been developed to simulate the dynamics of large-scale bedform patterns on the continental shelf. Most of the models are based on linear stability analysis and, therefore, only describe the characteristics of the bedforms at their formation. Apart from studying the principal formation mechanism, the models have take into account various processes (three dimensional flows, sediment sorting, wave stirring, different tidal constituents, etc) to describe the characteristics of the bedforms at specific locations. Exploration of the finite amplitude regime have also been made with simplified models. Future model developments are needed to explore long-term dynamics.Modelling bedforms on the continental shelf
http://hdl.handle.net/2117/100636
Modelling bedforms on the continental shelf
Calvete Manrique, Daniel
A number of morphodynamic models have been developed to simulate the dynamics of large-scale bedform patterns on the continental shelf. Most of the models are based on linear stability analysis and, therefore, only describe the characteristics of the bedforms at their formation. Apart from studying the principal formation mechanism, the models have take into account various processes (three dimensional flows, sediment sorting, wave stirring, different tidal constituents, etc) to describe the characteristics of the bedforms at specific locations. Exploration of the finite amplitude regime have also been made with simplified models. Future model developments are needed to explore long-term dynamics.
2017-02-07T14:27:03ZCalvete Manrique, DanielA number of morphodynamic models have been developed to simulate the dynamics of large-scale bedform patterns on the continental shelf. Most of the models are based on linear stability analysis and, therefore, only describe the characteristics of the bedforms at their formation. Apart from studying the principal formation mechanism, the models have take into account various processes (three dimensional flows, sediment sorting, wave stirring, different tidal constituents, etc) to describe the characteristics of the bedforms at specific locations. Exploration of the finite amplitude regime have also been made with simplified models. Future model developments are needed to explore long-term dynamics.Convectons
http://hdl.handle.net/2117/16779
Convectons
Alonso Maleta, María Aránzazu; Batiste Boleda, Oriol; Knobloch, Edgar; Mercader Calvo, María Isabel
A horizontal layer containing a miscible mixture of two fluids can generate dissipative solitons called convectons when heated from below. The physics of the system leading to this behavior is explained, and the properties of the resulting convectons are described. The convectons are shown to be present in a parameter regime known as the pinning region containing a multiplicity of stable convectons of odd and even parity. These lie on solution branches that snake back and forth across the pinning region and illustrate a phenomenon known as homoclinic snaking. Examples of single pulse and multipulse convectons in periodic and closed containers are exhibited and compared with similar states described by the Swift-Hohenberg equation. Time-dependent states in the form of localized traveling waves are computed and distinguished from convectons that drift.
2012-10-22T15:01:19ZAlonso Maleta, María AránzazuBatiste Boleda, OriolKnobloch, EdgarMercader Calvo, María IsabelA horizontal layer containing a miscible mixture of two fluids can generate dissipative solitons called convectons when heated from below. The physics of the system leading to this behavior is explained, and the properties of the resulting convectons are described. The convectons are shown to be present in a parameter regime known as the pinning region containing a multiplicity of stable convectons of odd and even parity. These lie on solution branches that snake back and forth across the pinning region and illustrate a phenomenon known as homoclinic snaking. Examples of single pulse and multipulse convectons in periodic and closed containers are exhibited and compared with similar states described by the Swift-Hohenberg equation. Time-dependent states in the form of localized traveling waves are computed and distinguished from convectons that drift.Mixing efficiency in buoyant flows
http://hdl.handle.net/2117/15363
Mixing efficiency in buoyant flows
Redondo Apraiz, José Manuel; Lopez Gonzalez-Nieto, Pilar; Díez Rilova, Margarita
2012-02-24T14:31:04ZRedondo Apraiz, José ManuelLopez Gonzalez-Nieto, PilarDíez Rilova, MargaritaSwimming propulsion due to vortices
http://hdl.handle.net/2117/15347
Swimming propulsion due to vortices
Redondo Apraiz, José Manuel; Arellano, Raul; Carrillo Cortés, José Alejandro; Matulka, Annia; Ben Mahjoub, Otman; Sekula, Emil
2012-02-23T19:52:55ZRedondo Apraiz, José ManuelArellano, RaulCarrillo Cortés, José AlejandroMatulka, AnniaBen Mahjoub, OtmanSekula, EmilThe role of surface rollers on the formation of surfzone transverse sand bars
http://hdl.handle.net/2117/6995
The role of surface rollers on the formation of surfzone transverse sand bars
Ribas Prats, Francesca; Swart, Huib E. de; Calvete Manrique, Daniel; Falqués Serra, Albert
A morphodynamic model has been developed to gain more fundamental knowledge about the formation of transverse finger sand bars. The model describes the feedback between waves, rollers, depth-averaged currents and bed evolution, so that self-organized processes can develop. The wave and bathymetric conditions measured at Egmond site are firstly applied and the modeled longshore current and wave height are compared with field data of that beach. Subsequently, the wave and bathymetric conditions measured at Noordwijk site are used to compare model results with the up-current oriented bars observed there. Realistic positive feedback leading to formation of the observed bars only occurs if the resuspension of sediment due to bore turbulence is included in the model. The modeled wavelength, crest orientation and growth rate agree with data but the model overestimates the migration rates.
2010-04-20T09:55:11ZRibas Prats, FrancescaSwart, Huib E. deCalvete Manrique, DanielFalqués Serra, AlbertA morphodynamic model has been developed to gain more fundamental knowledge about the formation of transverse finger sand bars. The model describes the feedback between waves, rollers, depth-averaged currents and bed evolution, so that self-organized processes can develop. The wave and bathymetric conditions measured at Egmond site are firstly applied and the modeled longshore current and wave height are compared with field data of that beach. Subsequently, the wave and bathymetric conditions measured at Noordwijk site are used to compare model results with the up-current oriented bars observed there. Realistic positive feedback leading to formation of the observed bars only occurs if the resuspension of sediment due to bore turbulence is included in the model. The modeled wavelength, crest orientation and growth rate agree with data but the model overestimates the migration rates.The role of the depth-averaged concentration in coastal morphodynamics
http://hdl.handle.net/2117/6560
The role of the depth-averaged concentration in coastal morphodynamics
Calvete Manrique, Daniel; Falqués Serra, Albert; Swart, Huib E. de; Dodd, Nicholas; Ribas Prats, Francesca; Garnier, Roland
In this contribution a discussion is presented on the development of self-organized coastal morphodynamic patterns
which are due to the joint action of gradients in the depth-integrated concentration and the flow. This is done in the
context of a depth-averaged shallow water model. Two physical mechanisms produce deposition-erosion patterns.
Deposition either occurs where the current flows from high to low depth-averaged concentrations (1) or where the flow
diverges (2). If flow conditions are quasi steady (i.e., the time scale on which bedforms evolve is much larger than the
hydrodynamic time scales) only the former mechanism contributes to the formation of bottom patterns.
2010-03-05T16:11:05ZCalvete Manrique, DanielFalqués Serra, AlbertSwart, Huib E. deDodd, NicholasRibas Prats, FrancescaGarnier, RolandIn this contribution a discussion is presented on the development of self-organized coastal morphodynamic patterns
which are due to the joint action of gradients in the depth-integrated concentration and the flow. This is done in the
context of a depth-averaged shallow water model. Two physical mechanisms produce deposition-erosion patterns.
Deposition either occurs where the current flows from high to low depth-averaged concentrations (1) or where the flow
diverges (2). If flow conditions are quasi steady (i.e., the time scale on which bedforms evolve is much larger than the
hydrodynamic time scales) only the former mechanism contributes to the formation of bottom patterns.