Geomorphologic, circulation and dynamic analysis in a meandering tidal channel, Bahía Blanca Estuary

ANGELES, G.R; PERILLO, GERARDO MIGUEL EDUARDO; PICCOLO MARIA CINTIA

THALASSAS (SANTIAGO DE COMPOSTELA)

Universidad de Vigo

Lugar: SANTIAGO DE COMPOSTELA; Año: 2003 vol. 19 p. 49 - 58

0212-5919

A meander of La Lista tidal channel (Bahia Blanca Estuary, Argentina) was selected in order to study the relationship between the geoforms that control the meandering channel evolution (mainly tidal flats and marshes) arid the dynamic and circulation characteristics of these channels. To achieve this goal a general survey was made in August 1999. The topographic characteristics of the channel and crosssection profiles from different sectors of the meander were compared with typical river profiles. Morphologic similarities between meander tidal channel cross-section (characterized by bidirectional flows) and meander river cross-section (characterized by unidirectional flows) were analysed. Velocities were measured during the ebb period (87 and 67 em S·l flood period, the highest values registered were 53 and33 em S·1 for U and V,respectively. Differencesamong the tidal current profiles along the meander were observed. Comparing the current velocity gradients in the different stations,