Erosion in Buenos Aires province: Coastal-management policy revisited

Isla, Federico Ignacio; Cortizo, Luis Camilo; Merlotto, Alejandra; Bértola, Germán R.; Albisetti, Melisa Pontrelli; Finocchietti, Cecilia

doi:10.1016/j.ocecoaman.2017.09.008

Cited by 35 publications

(18 citation statements)

References 38 publications

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“…The tidal regime is semidiurnal and microtidal (0.80 m mean amplitude; Servicio de Hidrografía Naval, Argentina) 2 . Current coastal retreat rates in this area average 0.8 m yr −1 (Isla et al, 2018).…”

Section: Study Sitementioning

confidence: 93%

Enhanced Weathering and Erosion of a Cohesive Shore Platform Following the Experimental Removal of Mussels

et al. 2021

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The organisms inhabiting intertidal platforms can affect their weathering and erosion rates. Research on biotic influences on platform integrity has traditionally emphasized the role of bioeroders (i.e., organisms that scrap or bore into platforms via mechanical and chemical means). Yet, recent studies illustrate that covers of sessile organisms on the surfaces of intertidal platforms can have bioprotective effects by reducing the efficacy of physical weathering and erosion agents. Eroding cliffs fronted by cohesive shore platforms are a pervasive feature along the continental Argentinean coastline (37–52°S). In this study, we investigated how mussel (Brachidontes rodriguezii) cover mediates weathering and erosion of a cohesive, consolidated silt platform at Playa Copacabana (5 km north of Miramar, Buenos Aires Province; 38° 14′ S, 57° 46′ W). By means of mussel removal experiments, we found that mussel cover attenuates variations in platform surface temperatures, enhances moisture retention during low tide, reduces rates of salt crystallization within the pores of the platform material, and attenuates hydrodynamic forcing on the platform surface. Mussel removal also led to a 10% decrease in surface hardness and a 2-mm reduction in platform height after 5 months. Collectively, our findings indicate that mussel beds limit substrate breakdown via heating-cooling, wetting-drying, and salt crystallization and provide some of the first experimental field evidence for the direct impacts of biotic cover on platform erosion. As intertidal platforms protect the cliffs behind from the hydraulic impact of waves, which may be enhanced with future sea-level rise, we posit that the protection of platforms by mussels indirectly moderates coastline retreat, especially on soft cohesive shores.

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Section: Study Sitementioning

confidence: 93%

Enhanced Weathering and Erosion of a Cohesive Shore Platform Following the Experimental Removal of Mussels

et al. 2021

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“…Anomalous storminduced heavy-mineral enrichment and placer or semiplacer formation were not systematically observed in the Bah ıa Blanca coastal province, where the tHM suite of most samples is poorer than in R ıo Colorado sand (Table 1). The sampled beaches are not being affected by severe erosion, which is mainly concentrated in urbanized areas where it was enhanced by inadequate coastal management (Isla et al, 2018). Semiplacer formation is more common in beaches of the Pared del Golfo coastal province south of the R ıo Negro mouth (for example, La Loberia; Table 1), where tides are stronger and sea cliffs and submerged abrasion platforms are undergoing rapid erosion (Isla & Cortizo, 2014).…”

Section: Coastal Erosion and Hydraulic-sorting Effectsmentioning

confidence: 99%

From Patagonia to Río de la Plata: Multistep long‐distance littoral transport of Andean volcaniclastic sand along the Argentine passive margin

et al. 2021

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Large sediment masses are transferred over many hundreds of kilometres along the coast of passive continental margins worldwide. The relevance of such a phenomenon for source-to-sink studies, environmental issues, and coastal management remains largely unperceived. This study traces the paths of volcaniclastic sand along ca 2170 km of the Argentine coast and documents a 760 km long cell of littoral transport extending from the formerly larger R ıo Colorado delta to the edge of the R ıo de la Plata mouth. During deglaciation stages and humid periods of the Pleistocene, a much greater sediment volume than today was transferred by the Desaguadero and Colorado rivers from the highest-relief tract of the Andean Cordillera to the Atlantic Ocean. Amphibole-rich sand originally supplied by the R ıo Desaguadero is being recycled today from Pampean lowlands to feed the beaches along R ıo de la Plata southern shores, whereas pure quartzose sand of R ıo Paran a is found only adjacent to its prograding delta. Augite-rich sand supplied by the R ıo Colorado is dominant along the coast of the Buenos Aires Province, where it mixes locally with coarser-grained quartz-rich detritus recycled in the urbanized Mar del Plata area. Hypersthene-rich sand of the R ıo Negro is dispersed both north and south of the mouth, where heavy-mineral-rich lag deposits are formed in areas of accelerated erosion and retreating sea cliffs. Changes of mineralogical signatures during long-distance littoral transport are largely ascribed to local supply from coastal erosion or hydrodynamic effects rather than to selective breakdown of labile grains. Whereas the relative abundance of amphibole and pyroxene is largely independent of transport distance, olivine is depleted both in the northern part of the Colorado littoral cell and south of the R ıo Negro mouth, which is chiefly ascribed to dilution by recycling of Neogene sediments that have undergone early intrastratal dissolution rather than to mechanical loss.Keywords Amphibole Color Index, Colorado and Negro rivers, durability of olivine and pyroxene, longshore sand transport, passive-margin sediments, R ıo de la Plata estuary, R ıo Desaguadero, sedimentary petrology, Southern Hemisphere swells.

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“…Estas situaciones problemáticas originan trastornos y pérdidas en el recurso litoral: ecosistemas, playas, arenas, cantidad y calidad del agua, entre otros (Goso Aguilar y Mesa, 2009;Goso Aguilar et al, 2010, 2011. Cambios en la dinámica costera inducidos por la acción del hombre se han reconocido en otras localidades costeras del Atlántico sur como en la costa argentina bonaerense (Marcomini y López, 1997;Isla et al, 1998Isla et al, , 2018Bértola et al, 2013;Fernández et al, 2017;Merlotto et al, 2017; entre otros), además de considerarse causas naturales. Los factores antrópicos que se asocian a los problemas de erosión en playas principalmente turísticas son: la fijación de médanos con forestación, construcción de infraestructuras como escolleras y drenajes, urbanizaciones, entre otras acciones (Marcomini y López, 1997;Isla et al, 1998Isla et al, , 2018Marcomini et al, Figura 7.…”

Section: Discusión Y Conclusionesunclassified

Dinámica costera y antropización en playas uruguayas: un análisis integrado para su conservación Título condensado: Dinámica costera y antropización, Uruguay

Boretto¹,

Rouzaut²,

Cioccale³

et al. 2018

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Los ambientes costeros están siendo afectados a escala global por una excesiva urbanización, crecimiento industrial y turismo, generando erosión, pérdida de biodiversidad y alteración del ecosistema; estas alteraciones constituyen potenciales riesgos con consecuencias negativas tanto ambientales como socioeconómicas. El sector litoral uruguayo, caracterizado por amplias playas de arenas separadas por promontorios rocosos, no es ajeno a esta problemática mundial. Considerando aspectos geomorfológicos, sedimentológicos y malacológicos se pretende comprender el impacto antrópico en la dinámica litoral para contar con una base de datos que sirva para evaluar el manejo del recurso playa. Para ello se compararon siete playas del Departamento Maldonado, una de las cuales se encuentra en el ambiente estuarial mientras que las demás están sobre el margen atlántico, con distintos grados de antropización y urbanización. A través del análisis geomorfológico, haciendo uso de imágenes satelitales, modelos digitales de elevación, procesamiento y almacenamiento de datos en un sistema de información geográfico, se parametrizó cada subambiente costero (mesoplaya, supraplaya, duna y duna modificada) teniendo en cuenta área, ancho, pendiente y perfil transversal en cada sitio. El análisis granulométrico permitió caracterizar cada localidad y cada subambiente; mediante estadística se pudo establecer una relación entre el aumento de la desviación estándar y la antropización en la franja litoral. La composición faunística particularizó cada playa, además mediante el cálculo de distintos índices se identificaron los sitios con mayor diversidad y dominancia. Se determinó que la antropización en la franja costera mediante incipiente desarrollo urbanístico modifica el sector de dunas generando una reducción de todos los subambientes, exponiendo zonas más vulnerables a la erosión inducida. Se espera que este trabajo sea útil en la planificación del ambiente litoral e identificación de zonas críticas.

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Erosion in Buenos Aires province: Coastal-management policy revisited

Cited by 35 publications

References 38 publications

Enhanced Weathering and Erosion of a Cohesive Shore Platform Following the Experimental Removal of Mussels

Enhanced Weathering and Erosion of a Cohesive Shore Platform Following the Experimental Removal of Mussels

From Patagonia to Río de la Plata: Multistep long‐distance littoral transport of Andean volcaniclastic sand along the Argentine passive margin

Dinámica costera y antropización en playas uruguayas: un análisis integrado para su conservación Título condensado: Dinámica costera y antropización, Uruguay

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