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  • Swimming propulsion due to vortices

     Redondo Apraiz, Jose Manuel; Arellano, Raul; Carrillo Cortes, Jose Alejandro; Matulka, Annia; Ben Mahjoub Akalay, Otman; Sekula, Emil
    Date of publication: 2012-02-15
    Book chapter

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    Postprint (author’s final draft)

  • Vortex decay in stratified flows

     Redondo Apraiz, Jose Manuel; Matulka, Anna Magdalena; Carrillo Cortes, Jose Alejandro
    Topical Problems of Fluid Mechanics
    Presentation's date: 2010-02-11
    Presentation of work at congresses

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  • Induced structures under seasonal flow conditions in the Ebro delta shelf: Laboratory and numerical models

     Carrillo Cortes, Jose Alejandro; Redondo Apraiz, Jose Manuel; Fraunie, Philippe; Durand, Nathalie
    Nuovo cimento della Società Italiana di Fisica B. General physics relativity
    Date of publication: 2009-07-28
    Journal article

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    The characteristic induced length scale produced by a river flow in its outlet is studied. Two experimental methods are compared: a) Physical modeling in laboratory and b) numerical mesoscale diffusion model; under low tidal and realistic seasonal flow conditions from Spring, Summer, Fall and Winter field data from the Ebro delta shelf. The physical laboratory experiences were performed on a five-meter diameter turntable, using the Froude-Rossby similarity. This paper shows complementary results from both methods investigating the vortex characteristic and the dynamics of the flow. The experimental results under rotating conditions show coherent vortex dynamics in the large-meso scale coastal boundary. The numerical model, on the other hand, lacks the mesoscale vortex dynamics and its induced diffusion but gives reasonable flow conditions in the close region (15–20 km) around the river mouth. Both the experiments and numerical simulations show river plume diffusion smaller than D2 α t3.

  • Multifractal observations of eddies, oil spills and natural slicks in the ocean surface

     Platonov, Alexei; Carrillo Cortes, Jose Alejandro; Matulka, Anna Magdalena; Sekula, Emil; Grau Barcelo, Joan; Redondo Apraiz, Jose Manuel; Tarquis Alfonso, Ana Maria
    Nuovo cimento della Società Italiana di Fisica C. Geophysics and space physics
    Date of publication: 2009-06-11
    Journal article

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    Natural and man-made distributions of tensioactive substance concentrations in the sea surface features exhibit self-similarity at all radar reflectivity levels when illuminated by SAR. This allows the investigation of the traces produced by vortices and other features in the ocean surface. The man-made oil spills besides often presenting some linear axis of the pollutant concentration produced by moving ships also show their artificial production in the sea surface by the reduced range of scales, which widens as time measured in terms of the local eddy diffusivity distorts the shape of the oil spills. Thanks to this, multifractal analysis of the different backscattered intensity levels in SAR imagery can be used to distinguish between natural and man-made sea surface features due to their distinct self-similar properties. The differences are detected using the multifractal box-counting algorithm on different sets of SAR images giving also information on the age of the spills. Different multifractal algorithms are compared presenting the differences in scaling as a function of some physical generating process such as the locality or the spectral energy cascade .

  • Editorial: advances in environmental turbulence

     Redondo Apraiz, Jose Manuel; Rodriguez Cantalapiedra, Inmaculada; Carrillo Cortes, Jose Alejandro
    Environmental Turbulence - Campus Universitari de la Mediterrania
    Presentation's date: 2009-06-15
    Presentation of work at congresses

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  • Workshop in Environmental and Geo-Astrophysical Turbulence

     Rodriguez Cantalapiedra, Inmaculada; Sanchez Ariz, Miguel A.; Ben Mahjoub Akalay, Otman; Carrillo Cortes, Jose Alejandro; Castilla Lopez, Roberto; Sekula, Emil; Redondo Apraiz, Jose Manuel
    Participation in a competitive project

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  • Spatial and temporal variation of picoplanktic cyanobacteria population in a density stratified estuary, and the introduction of a cellular gradient number

     Carrillo Cortes, Jose Alejandro; Huq, P; Perez, M C; Redondo Apraiz, Jose Manuel
    Estuarine coastal and shelf science
    Date of publication: 2008-01
    Journal article

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  • The shear layer above and in urban canopies

     Huq, P; Carrillo Cortes, Jose Alejandro; White, La; Redondo Apraiz, Jose Manuel; Dharmavaram, S; Hanna, Sr
    Journal of applied meteorology and climatology
    Date of publication: 2007-03
    Journal article

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  • Vortex Structure in the North of the Ebro Delta Shelf (NW Mediterranean Sea)

     Platonov, Alexei; Carrillo Cortes, Jose Alejandro; Redondo Apraiz, Jose Manuel
    European Geosciences Union General Assembly
    Presentation's date: 2007-04-25
    Presentation of work at congresses

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  • Grup de Turbulencia, Fluctuacions i Difusió (Ayuda para grupos de investigación consolidados)

     Ramirez de La Piscina Millan, Laureano; Platonov, Alexei; Carrillo Cortes, Jose Alejandro; Sekula, Emil; Peñaranda Ayllon, Angelina; Echebarria Dominguez, Blas; Auguet Sangra, Carlota Eugenia; Meca Alvarez, Esteban; Cami Babra, Enrique; Castilla Lopez, Roberto; Rodriguez Cantalapiedra, Inmaculada; Grau Barcelo, Joan; Lacasta Palacio, Ana Maria; Redondo Apraiz, Jose Manuel; Sanchez Ariz, Miguel A.; Benitez Iglesias, Raul; Gonzalez Cinca, Ricardo
    Participation in a competitive project

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  • Large and meso scale eddy structures forced by a river flow in the west Mediterranean under rotating conditions: Numerical and laboratory experiments.

     Carrillo Cortes, Jose Alejandro; Redondo Apraiz, Jose Manuel; Fraunie, P; Durand, N
    Geophysical research abstracts
    Date of publication: 2003-03
    Journal article

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  • Topological Structures in Rotating Stratified Flows

     Redondo Apraiz, Jose Manuel; Carrillo Cortes, Jose Alejandro; Perez, E
    Geophysical research abstracts
    Date of publication: 2003-04
    Journal article

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  • Induced Vortical Structures in the Balearic Sea: SAR images análisis and laboratory experiments

     Redondo Apraiz, Jose Manuel; Carrillo Cortes, Jose Alejandro; Platonov, Alexei
    Geophysical research abstracts
    Date of publication: 2003-04
    Journal article

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  • Influencia de la turbulencia y de la Dinámica de Interfases de Densidad sobre Organismos Planctónicos."Aplicación al estuario del Ebro"  Open access

     Carrillo Cortes, Jose Alejandro
    Defense's date: 2002-12-05
    Department of Applied Physics, Universitat Politècnica de Catalunya
    Theses

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    A T E N C I Ó ! ! !Per consultar aquesta tesi cal navegar partint del fitxer 0INICI.pdfRESUMENLas variables físicas que describen la mezcla, son perfectamente comparables para experimentos de laboratorio estudiados por un nutrido grupo de investigadores en la dinámica de fluidos medioambientales. En este trabajo se relacionan variables de tipo físicas y biológicas y se destaca el uso de las primeras como ayuda en la interpretación de las variables biológicas, demostrándose su utilidad. Se utilizan además distintos experimentos de laboratorio enfocados al estudio de la dinámica de la mezcla turbulenta en un flujo estratificado inducida por cizalla y a las escalas de las estructuras inducidas por dinámica de la pluma en el delta. Este objetivo se lleva a cabo describiendo las características de un ambientes estuarino y de la pluma por medio de indicadores como el número de Richardson y de Reynolds. Para ello se emplea una metodología avanzada de toma de muestras, técnicas experimentales de laboratorio como procesamiento de imágenes y técnicas numéricas para la modelización de la pluma en la desembocadura del estuario.El estuario bajo estudio se encuentra presente en el delta del Ebro, donde existe la mayor parte de año una cuña estable que es controlada principalmente por los caudales locales del río. Con la finalidad de observar una cuña estable, se realizo una campaña en el mes de julio de 1997. Adicionalmente para la obtención de variable a partir de las cuales puede hacerse una descripción de la dinámica de la mezcla y la obtención de variables biológicas, se desarrollaron una serie de campañas donde se buscaron diferentes condiciones del flujo del río que determina la mezcla en el estuario; estas campañas se realizaron las fechas del 5 de abril de 1998, 12 de julio, 5 de octubre de 1999 y 5 de febrero de 2000. En este trabajo junto al trabajo de campo, se realizan experimentos de laboratorio y simulaciones numéricas; se establece además un criterio cuantitativo del inicio y final de una capa de una estratificación en la columna de agua, se establecen zonas características de la mezcla en el estuario, la distancia de la cabeza de la pluma en cualquier punto del estuario incluyendo la boca a partir de la medida de la densidad mínima en la columna de agua, que la medida de los caudales locales maneja dinámica de la mezcla tanto en el cuerpo del estuario como en la pluma, además de medidas de eficiencia de mezcla, relaciones de la abundancia de organismos típicos de agua marina en el estuario de acuerdo a uno de los descriptores de la mezcla como el número de Reynolds, se describe la dinámica general de la circulación superficial inducida por la pluma en la zona costera adyacente del delta del Ebro por medio del seguimiento de partículas trazadoras y de la circulación en la columna de agua por seguimiento de colorante, por último se comparan las estructuras y escalas dominantes observadas experimentalmente con estructuras observadas por medio de percepción remota y simulaciones numéricas obteniéndose una buena correlación con los tendencias las medidas naturales y experimentales de laboratorio y numéricas.

    Physical variables that describe mixing are compared with experimental laboratory results from a large number of studies of mixing dynamics in environmental fluids to find habitat regimes for primary production. The work relates physical and biological variables, and emphasises the utility of laboratory studies. Several laboratory experiments that focused on turbulent mixing dynamics in stratified shear flows are used to describe (a) mixing in the estuary and (b) induced circulation in the river plume. Mixing descriptors as entrainment, Richardson number and Reynolds number and field data were employed, and advanced techniques of laboratory simulations, image processing and numerical modelling were used to match (a) to (b). Four kinds of experiments were used to describe the dynamics in the whole estuary. 1) Mixing turbulence across a density interface generated by an oscillating grid inside a mixing-box. 2) The horizontal advance of a turbulent front in a stratified system with a lateral current, inside a 1 m x 1 m square box. 3) Induced circulation in the delta del Ebro slope and shelf that were performed with an experimental model in a 2 m x 4 m rectangular tank on a 5-m diameter turntable. 4) Dispersion simulations in the river plume with the OCK3D code. Experiments 1 and 2 were developed in the UPC applied physic laboratories in Barcelona, experiments 3 were performed in the SINTEF laboratories in Trondheim and numerical experiments 4 were realized in the LSEET laboratories in Toulon. The estuary under study is the delta of the del Ebro, where a stable saline wedge is present the greater part of the year, driven by the river flow. A field campaign was carried out to observe a complete large stable saline wedge during the month of July of 1997. Additionally, to obtain the physical descriptors, cruises were made on 5 April, 1998, 12 July and 5 October, 1999 and 5 February, 2000 to observe several flow conditions in the river estuary. Particle tracking and optical measurements in the water column were used to study the induced length scale dynamics in the shelf and slope of the delta del Ebro. The dominant structures and scales from SAR images and numerical and laboratory simulations were compared with the field data.With the help of laboratory and field experiments and numerical simulations, qualitative criteria were suggested to determine the extent of the interface ending in a stratified water column, the different mixing characteristic zones within the estuary, and the distance of the estuary head, since elsewhere points in the estuary (including the river mouth) are obtained by means of the minimum density in the water column. Both estuary mixing and plume dynamics are driven by the local flow. In the present analysis of mixing efficiency, the phytoplankton abundance is in accord with the Reynolds number as a mixing descriptor.

  • Coastal and Interfacial Mixing - The Ebro Delta

     Redondo Apraiz, Jose Manuel; Carrillo Cortes, Jose Alejandro; Platonov, Alexei
    Date: 2002-01
    Report

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  • Coastal and Interfacial Mixing. Laboratory experiments and Satellite Observations

     Carrillo Cortes, Jose Alejandro; Sanchez Ariz, Miguel A.; Platonov, Alexei; Redondo Apraiz, Jose Manuel
    Physics and chemistry of the earth. Part B, hydrology oceans and atmosphere
    Date of publication: 2001-03
    Journal article

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  • Coastal and interfacial mixing. Laboratory experiments and satellite observations

     Carrillo Cortes, Jose Alejandro; Sanchez Ariz, Miguel A.; Redondo Apraiz, Jose Manuel; Platonov, Alexei
    Physics and chemistry of the earth. Part B, hydrology oceans and atmosphere
    Date of publication: 2001-03
    Journal article

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  • Analysis of three-layer mixing conditions in a Stratified river Estuary

     Carrillo Cortes, Jose Alejandro; Redondo Apraiz, Jose Manuel; Gonzalez, Medina P
    Geophysical research abstracts
    Date of publication: 2001-03
    Journal article

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  • Front structure and dispersion processes in the Black Sea: remote sensing, laboratory and numerical models

     Redondo Apraiz, Jose Manuel; Carrillo Cortes, Jose Alejandro; Benitez, C.; Castilla Lopez, Roberto; Platonov, Alexei
    Date: 2000-05
    Report

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  • Comparation of laboratory mixing observations of density interfaces with estuary

     Carrillo Cortes, Jose Alejandro; Redondo Apraiz, Jose Manuel; González del Rio, J.
    Geophysical research abstracts
    Date of publication: 1999-04
    Journal article

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  • Turbulent velocities near density interfaces

     Sanchez Ariz, Miguel A.; Carrillo Cortes, Jose Alejandro; Platonov, Alexei; Redondo Apraiz, Jose Manuel
    Geophysical research abstracts
    Date of publication: 1999-04
    Journal article

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  • Plankton interaction and behaviour near density interfases

     Carrillo Cortes, Jose Alejandro
    Workshop on Advances in Turbulence V
    Presentation's date: 1999-06-08
    Presentation of work at congresses

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  • Physical and biological descriptors in estuarine density interfases

     Carrillo Cortes, Jose Alejandro
    Workshop on Advances in Turbulence V
    Presentation's date: 1999-06-08
    Presentation of work at congresses

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  • Physical and biological descriptors in estuarine density interfases

     Carrillo Cortes, Jose Alejandro
    Workshop on Advances in Turbulence V
    Presentation of work at congresses

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  • Characterisation of interfacial instabilities in zero-mean flows

     Sanchez Ariz, Miguel A.; Carrillo Cortes, Jose Alejandro; Redondo Apraiz, Jose Manuel
    Workshop on Advances in Turbulence V
    Presentation of work at congresses

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  • Plankton interaction and behaviour near density interfases

     Carrillo Cortes, Jose Alejandro; Redondo Apraiz, Jose Manuel
    Workshop on Advances in Turbulence V
    Presentation of work at congresses

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  • Characterisation of interfacial instabilities in zero-mean flows

     Carrillo Cortes, Jose Alejandro
    Workshop on Advances in Turbulence V
    Presentation's date: 1999-06-08
    Presentation of work at congresses

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