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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Sediment management and morphodynamics : Hydrodynamic computational modelling of an estuary affected by human intervention
Hydrodynamic computational modelling of an estuary affected by human intervention
Author : ADOLFO J CARDOZO (1), LUIS P. THOMAS (2), MARGARITA PORTAPILA (3) , BEATRIZ M. MARINO (2) & MART¨ªN ROMAGNOLI (3)
ABSTRACT
The microtidal coastal plain Quequ¨¦n Grande River estuary (Buenos Aires, Argentina) is 3-5m deep in its middle and
upper sections while a deep-water harbour is located in its 2km-long lower section. Here the original shape was
substantially modified by means of frequent dredging to provide favourable navigational conditions, the widening and
stabilization of the banks, and the construction of piers and two important jetties to protect the port from the storms and
waves. Minor falls located about 15km inland mark the estuary head and impose special boundary conditions to the flows.
These features make it important to analyse the dynamics of the currents and sediment transport in order to prevent the
possible degradation of the aquatic system. In this work, numerical solutions obtained using the FVCOM hydrodynamic
computational open code model of oceanic circulation are presented. The results are calibrated and validated with field
measurements performed during complete tidal cycles and with data provided by fixed monitoring stations. The dynamics
of the saline intrusion and sediment transport is determined varying the magnitude of the river discharge and the tidal
height in representative ranges of the estuary parameters, thus contributing to the global understanding of the estuarine
behaviour. The findings of the numerical simulation compensate the scarce systematic measurements due to the wide
range of the river flow and the morphologic and structural changes that occurred in the lower sector, mostly in the last
decades. The practical importance of this study resides in its contribution to the comprehension of the transport of
particulate matter, whose settling implies continuous dredging operations to maintain the 12-14m depth in the lower sector,
and the eventual upstream dispersion of pollutants released into the waters from an urban area placed in the last
kilometres of the estuary, which may cause serious ecologic and economic consequences.
File Size : 752,035 bytes
File Type : Adobe Acrobat Document
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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