PICCOLO Maria Cintia
capítulos de libros
Geomorphology and sediment dynamics of the middle reach of the Bahía Blanca.
PERILLO, G.M.E.; GOMEZ, E.A.; CUADRADO, D.G.; ALBERDI, E.; VITALE, A.; PICCOLO, M.C.
River, Coastal and Estuarine Morphodynamics.
CRC Taylor & Francis Group
Lugar: Boca Raton; Año: 2010; p. 237 - 241
The mesotidal estuary of Bahía Blanca (Argentina) has marked ebb-oriented residual flow and sediment transport. Along the Canal Principal, there is a series of subtidal dune fields with a well defined ebb displacement. Including some forms have very steep lee side where flow separation is evident. However, a sector of the Canal Principal of over 2.5 million m2 has sandy bottom but no bedforms have developed even though currents reach values similar to those observed elsewhere. Therefore, the main objective is to analyze this sector of the estuary from the geomorphologic and sediment transport points of view towards defining the reasons for the lack of bedforms in the area. Detailed bathymetric surveys with a GeoSwath and bottom sediment sampling for the sector where made prior to define a set of cross sections where ADCP current profiles were made along a tidal cycle both in spring and neap tide conditions. The geomorphology of the area plays a major role in the sediment dynamics of the area. Ebb oriented residual sediment transport is about one order of magnitude larger than the equivalent for flood conditions. Most of the sediment transported from upstream is rapidly bypass over the area and very little is actually deposited in there.