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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Characteristics of the tidal front and particulate matter transport in an estuary limited by morphol...
Characteristics of the tidal front and particulate matter transport in an estuary limited by morphology
Measurements of flow, suspended matter transport and maximum distance travelled by the tidal front in a coastal plain
estuary, located in the southeast of Buenos Aires province (Argentina) are reported. The system has shallow upper and
middle sectors, while an important deep-water port is installed along the lower zone. Findings are related to the
morphology, river discharge, tidal height and meteorological conditions. Salinity profiles, velocity field and backscatter
intensity were obtained during tidal cycles in stations located in the last 10.5km of the estuary. The concentration, type and
size of the suspended elements are determined analysing water samples, and generalized for the cross-section by means
of the relationship between the backscatter intensities of two ADCPs operating at different frequencies. Under calm
weather conditions, the estuary is stratified and the suspended solids consist mainly in flocs of varied sizes composed of
particles of medium and very fine silt, clay and abundant organic matter. Hence, the stratified estuary behaves as a low
energy system that favours the aggregation of the wash load while the settling of sediments occurs mainly on specific
places of the harbour where intense dredging is needed. The results are the first of a series of long-term measurements
under different hydrodynamic conditions and complement those previously obtained in the lower sector, thus contributing
to the understanding of the global estuarine dynamics. The information acquired compensates for the lack of systematic
measurements due to the wide range of river flow and the morphological and structural changes that occurred in the port
zone, mainly in the last decades.
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Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Sediment management and morphodynamics
Date Published : 28/08/2015
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