Patron de transporte de sedimento en Bahia Magdalena, Baja California Sur, Mexico, inferido del analisis de tendencias granulometricas

Abstract

RESUMEN.Las tendencias espaciales de los parámetros texturales (tamaño medio de grano, selección y asimetría) en Bahía Magdalena, Baja California Sur, México, se calcularon a partir de 58 estaciones de muestreo, con la finalidad de inferir la trayectoria de los vectores residuales de transporte de sedimentos. Los análisis de las tendencias espaciales y de componentes principales aplicados a los parámetros texturales indicaron que el sedimento, con una buena selección, está asociado con arenas finas a muy finas. Los vectores residuales de transporte sugieren la presencia de dos giros en la dispersión de material clástico: (1) giro ciclónico en la parte central y profunda, y (2) giro anticiclónico en la región sureste de la bahía. Las trayectorias de las partículas sedimentarias tienen una excelente correlación con las corrientes residuales de marea dentro de la Bahía Magdalena. Palabras clave: tendencias espaciales, parámetros texturales, transporte de sedimento, Bahía Magdalena, México. Sediment transport patterns in Magdalena Bay, Baja California Sur, Mexico, inferred from grain-size trendsABSTRACT. The grain-size trend analysis (grain size, sorting asymmetry) was determined at 58 stations in order to infer the residual vectors of sediment transport in Magdalena Bay, Baja California Sur, Mexico. Grain-size trend analysis and principal components analysis were applied to textural sediment parameters. The results indicated that well-sorted sediment is associated with fine to very fine sand. The residual vector transport suggests the presence of two gyres in the dispersion of clastic material: (1) acyclone-ic gyre in the deeper, central part and (2) an anticyclone-ic gyre in the southeast part of the bay. The sediment transport pattern is highly correlated with the residual tidal currents in Magdalena Bay.

Granulometric Analysis of Shallow Vents Sediments at Banderas Bay (Mexico)

“…Blott and Pye [14] emphasized that grain size is the most fundamental property of sediment particles, since it affects its drag, transport, and deposition; similarly, an adequate granulometric analysis provides information on its origin, transport history and deposition conditions [15][16][17]. Whereas Sánchez et al [18] emphasized that the granulometric tendencies of the sediments have been widely used to infer the possible trajectories of the clastic material in diverse coastal environments. This research aimed to determine the grain size classification of the marine sediments in SSHSPM and in its influence area, in order to leave a preliminary frame of reference for future studies related to the sediments of this hydrothermal system.…”

Progradation and retrogradation of the Medjerda delta during the 20th century (Tunisia, western Mediterranean)

“…The decrease in sediment discharge caught by dams and water quality deterioration are some examples of the anthropogenic pressure suffered by the river. Similarly, deltaic coasts suffer from sediment loads restriction as their equilibrium is regulated by river feeds (S anchez et al, 2010;Walling, 2006). The coastline regression and the coastal ecosystem degradation are the main consequence of the river discharge reduction.…”