Peligrosidad, vulnerabilidad y riesgos en la costa norte de la ciudad de Mar del Plata, Argentina. Caso de estudio: playas Danilo y Sun Rider

El siguiente trabajo plantea que el espacio geográfico litoral puede ser concebido como un espacio problema por la coexistencia de problemas ambientales y conflictos sociales. Los aspectos de interés para la planificación se manifiestan con impactos negativos. Entre éstos últimos, se destacan aquellos vinculados con condiciones de amenaza y vulnerabilidad donde los mismos se manifiestan cuando interacciones no planificadas del medio social sobre el medio natural, derivan en situaciones de riesgo para el hombre, sus obras y demás bienes del entorno. Este es el caso de las playas Danilo y Sun Rider, en la costa norte de la ciudad de Mar del Plata

The connection between the depopulation of localiti es and passenger rail services in the Province of Buen os Aires in Argentina between 1960 and 2009

Indizada en: WorldCat; CrossRef; JournalSeek; Electronic Journals Library (EJL); Zeitschriftendatenbank (ZDB);EZB; Researchbib; Wissenschaftszentrum Berlin (WZB); Directory of Research Journals Indexing (DRJI)---------- Between 1960 and 2001 there were two processes that drew the interest of some social researchers in Argentina. On the one hand there was a process of rural depopulation from localities in the province of Buenos Aires (similar to the process of urbanization across Latin America). On the other hand, there was the break up of the railways that led to the cessation of passenger services to hundreds of localities inside the province of Buenos Aires. This study compares the two variables -localities in the interior of the province of Buenos Aires that lost population and railway lines which recorded decrease in the provision of passenger transport services. Census data and rail traffic between 1960 and 2009 are used. This crosses a quantitative methodology with concepts that the geographer Milton Santos has proposed. Maps are generated to look for any correspondence between these variables. Finally the concept of lag is applied to observe possible temporal relationships between variables. The results represent a first approach to a subject that has never been addressed with this methodology and analysis tool, verifying that it is necessary to incorporate more data to facilitate further analysis.Fil: Diez Tetamanti, Juan Manuel. Universidad Nacional de la Patagonia "San Juan Bosco". Facultad de Humanidades y Ciencias Sociales Sede Comodoro. Instituto de Investigaciones Geográficas de la Patagonia; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Pontrelli Albisetti, Melisa. Universidad Nacional de Mar del Plata. Facultad de Humanidades. Departamento de Geografia. Grupo de Estudios de Ordenacion del Territorio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentin

A Comparative Analysis between Mar del Plata Harbour, Argentina and Tweed River, Australia: Sand Bypassing Techniques as a Strategy to Overcome the Littoral Drift Obstruction

Las obras de abrigo del Puerto de Mar del Plata obstruyeron el transporte litoral desde su construcción a principios del siglo XX. Por refracción del oleaje, un banco se forma en el acceso al puerto y disminuyen los aportes sedimentarios al norte. Esta situación obliga a dragados frecuentes y al repoblamiento artificial de playas, con importantes inversiones económicas. Dichas estrategias fueron meros paliativos y no solucionaron el problema de obstaculización de la deriva costera. Estos problemas de deriva litoral también afectaron la desembocadura del río Tweed (Nueva Gales del Sur, Australia). Para evitar sus consecuencias se efectivizó una planta de “bypassing”. Los objetivos de este trabajo son: a) comparar las variables naturales y humanas que influyen en la dinámica litoral y navegabilidad en ambos sitios, y b) analizar y discutir las técnicas de mejoramiento aplicados en ambas costas . El método de trabajo involucra una revisión cartográfica, la sistematización de datos e información recopilada, la formulación de propuestas y recomendaciones. De la comparación de ambos sitios, se concluye que las estrategias implementadas en la costa australiana respetaron la dinámica costera y aseguraron su sostenibilidad, mejorando la seguridad en la navegación, y la conservación de los hábitats para organismos marinos. En el litoral de Mar del Plata, las técnicas implementadas no dieron los resultados esperados, a pesar de los costos económicos, ambientales y sociales de su puesta en práctica. Las diferencias ameritan que se considere la conveniencia e implementación de la técnica de “bypassing” en Mar del Plata.The port of Mar del Plata altered sediment dynamics since it was built at the beginning of the XX century. Due to the diffraction on waves, the access to the port is partially clogged, reducing the sediment inputs to the North. This situation requires a frequent dredging and beach nourishment repopulation with signifi cant economic investments. These strategies were palliatives and do not solve the problem: the obstruction of the coastal drift. The objectives of this exploratory work are: a) compare the human and natural variables that infl uence coastal dynamics and navigability, in two coastal sites that have similar erosion problems, the port of Mar del Plata (Argentina) and the mouth of the Tweed River, New South Wales (Australia), and b) to analyse and discuss the technique of “sand bypassing” applied by the Australian government, to address the sand defi cit at the beach of Gold Coast. The method involves are cartographic review, and the development of the theoretical framework and systematization of data and information is analysed from a comparison of the two sites. It was observed remediation strategies implemented in the Australian coastal respected the coastal dynamics and ensured its sustainability. Also, it improve the navigation safety and the effect of waves and habitat conservation for marine organisms improved. On the contrary, in Mar del Plata, traditional techniques to recover the port and beaches have not yielded the expected results, despite the economic, environmental and social aspects of its implementation. It is recommended that the technique of “sand bypassing” should be implemented in Mar del Plata harbour.Fil: Pontrelli Albisetti, Melisa. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras; Argentina. Universidad Nacional de la Plata. Facultad de Humanidades y Cs.de la Educacion. Centro de Investigaciones Geograficas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Humanidades. Departamento de Geografia. Grupo de Estudios de Ordenacion del Territorio; ArgentinaFil: Lazarow, Neil. Commonwealth Scientific and Industrial Research Organisation; AustraliaFil: García, Mónica Cristina. Universidad Nacional de la Plata. Facultad de Humanidades y Cs.de la Educacion. Centro de Investigaciones Geograficas; Argentina. Universidad Nacional de Mar del Plata. Facultad de Humanidades. Departamento de Geografia. Grupo de Estudios de Ordenacion del Territorio; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Isla, Federico Ignacio. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Mar del Plata. Instituto de Investigaciones Marinas y Costeras; ArgentinaFil: Piccolo, Maria Cintia. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Bahía Blanca. Instituto Argentino de Oceanografía (i); Argentina. Universidad Nacional del Sur. Departamento de Geografía; Argentin

Erosion in Buenos Aires province: Coastal-management policy

As the Buenos Aires Province coastline is dominated by a longshore transport from south to north, obstructions performed at the beginning of the 20th century originated the width reduction of some beaches. Fields of groins were constructed without a master plan; therefore, more obstructions caused a dramatic decrease in the longshore sand supply. These defense alternatives were only applied in the counties of the southeast of the province (General Pueyrredon, General Alvarado, Mar Chiquita), close to the quarries, and with resistant abrasion platforms. Northern beaches (Villa Gesell, Pinamar and Partido de la Costa), on the other hand, are natural with a dissipative morphodynamics. Where the coastal route is close to active cliffs, riprap structures were constructed parallel to the coastline. Today, the southeastern coast remains with the higher erosion rates of the Buenos Aires coastline. With the aim of aerial and satellite photographs, and images, erosion rates were calculated. In order to analyze the success of coastal defenses, comparisons were established according to two intervals: 1960e1980, and 1980e2008. Defense structures have contributed to the decrease in the erosion rates in some areas; in other areas, the rates have increased due to the drift obstruction. In some critic areas, and considering present erosion rates, future positions of the coastline were simulated for the next 20e30 years. At the same time, there are new unexpected problems derived from a project to construct detached breakwaters that were not completed, and considering jetties that were constructed without a previous impact-assessment analysis

Erosion in Buenos Aires province: Coastal-management policy revisited

As the Buenos Aires Province coastline is dominated by a longshore transport from south to north, obstructions performed at the beginning of the 20th century originated the width reduction of some beaches. Fields of groins were constructed without a master plan; therefore, more obstructions caused a dramatic decrease in the longshore sand supply. These defense alternatives were only applied in the counties of the southeast of the province (General Pueyrredon, General Alvarado, Mar Chiquita), close to the quarries, and with resistant abrasion platforms. Northern beaches (Villa Gesell, Pinamar and Partido de la Costa), on the other hand, are natural with a dissipative morphodynamics. Where the coastal route is close to active cliffs, riprap structures were constructed parallel to the coastline. Today, the southeastern coast remains with the higher erosion rates of the Buenos Aires coastline. With the aim of aerial and satellite photographs, and images, erosion rates were calculated. In order to analyze the success of coastal defenses, comparisons were established according to two intervals: 1960–1980, and 1980–2008. Defense structures have contributed to the decrease in the erosion rates in some areas; in other areas, the rates have increased due to the drift obstruction. In some critic areas, and considering present erosion rates, future positions of the coastline were simulated for the next 20–30 years. At the same time, there are new unexpected problems derived from a project to construct detached breakwaters that were not completed, and considering jetties that were constructed without a previous impact-assessment analysis.Fil: Isla, Federico Ignacio. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; ArgentinaFil: Cortizo, Luis. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; ArgentinaFil: Merlotto, Alejandra. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; ArgentinaFil: Bertola, German Ricardo. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; ArgentinaFil: Pontrelli Albisetti, Melisa. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; ArgentinaFil: Finocchietti, Cecilia. Universidad Nacional de Mar del Plata. Facultad de Ciencias Exactas y Naturales. Instituto de Geología de Costas y del Cuaternario. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto de Geología de Costas y del Cuaternario; Argentin