Abstract
Beaches are considered a fragile and complex natural environment. To achieve the design of a coastal management, measures according to the characteristics and priorities of each beach, it is essential to know each particular beach morphodynamics. In the present study, volumetric and sedimentary variations of beaches located in Mar del Sur and Miramar, coastal towns of the municipality of General Alvarado, were evaluated through topographic profiles and seasonal sedimentary samplings. In general, beach widths have increased in all the measured beaches, except in the south of the studied area, where it remained stable. In the south, there is evidence of an erosive process that decreases towards the north of the study area. Despite being the most urbanized, the beaches of Miramar are in equilibrium or in evident progradation. In addition, important changes were observed due to summer/winter seasonal cycles, as well as the recovery of beaches after post-storm periods. Regarding the granulometric composition of beaches, medium-sized sands predominate in Miramar while fine sands are present towards the south of the study area. Because of the absence of similar studies in the area, these results constitute an important contribution for the elaboration of a coastal management programme for the municipality.
Highlights
Beaches are considered a fragile and complex natural environment
Con características geomorfológicas diferentes y con diversos grados de urbanización e intervención antrópica, se seleccionaron dos playas en Mar del Sur (Chalets y Coco Loco), una al sur de Miramar (Frontera Sur) y dos en el casco urbano de Miramar (Monolito y HR)
Las cinco playas estudiadas poseen diferentes características geomorfológicas y diversos grados de urbanización e intervención antrópica: en Mar del Sur las playas Chalets y Coco Loco y en Miramar, Frontera Sur, Monolito y HR
Summary
En el municipio de General Alvarado se localizan cinco centros urbanos y, con 47 km de costa, tres de ellos son costeros: Miramar (la ciudad cabecera, 6 km de costa), Mar del Sur (3 km) y Centinela del Mar (1 km). Las cinco playas estudiadas poseen diferentes características geomorfológicas y diversos grados de urbanización e intervención antrópica: en Mar del Sur las playas Chalets y Coco Loco y en Miramar, Frontera Sur, Monolito y HR En este sector de Mar del Sur, se construyeron viviendas sobre el acantilado frente a la playa y el perfil se localiza al pie de Figura 3. A fines del año 1997 se construyó junto al arroyo La playa Coco Loco (38o20’50,38”S-57o59’16,69”W) (Figuras 2C y D) es una playa con buen desarrollo de bermas de tormenta que ocupa una ensenada compuesta por afloramientos de La Tigra en su margen norte, un espigón para evitar la erosión recurrente de la playa y encauzar la salida de las aguas. Balance sedimentario (m3) Pendiente total (%) Pendiente frontal (%) Ancho de playa (m)
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