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1 April 2013 Morphological and sedimentological processes of an Amazon Estuary, Maguari River (Pará - Northern Brazil)
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Abstract

Costa, M. S., Rollnic, M., Silveira, O. F. M., Miranda, A. G. O. and Santos, R. R. L. 2013. Morphological and sedimentological processes of an Amazon Estuary, Maguari River (Pará - Northern Brazil). Proceedings 12th International Coastal Symposium (Plymouth, England), Journal of Coastal Research, Special Issue No. 65, pp. 1110–1115, ISSN 0749-0208.-->

The Maguari river is an area influenced by both tide and waves with gentle declivity from downstream to upstream to provide until −42 m depth, averaging 24m in the channel and −5m in the margins and distal areas. These sectors offer hazard to navigation by exposing muddy-sandy bars. The river expresses the geological evolution of the region, having been originated by a tectonic fault oriented to NW-SE, through a filling process. Furthermore, it is characterized as importer of the sediments masking channel dimensions confirmed by the high current speeds. The river has about 65% of the substrate covered by mud, with extensive tidal flats. According to the sedimentological analysis, the environment has a high to very high hydrodynamic pattern ranging from silt to sandy-silt according to ratings. The low concentrations of clay show that the environment is highly energetic agreeing with other studies in the region. The organic matter concentration ranged from 0 to 12.5% with peak concentrations in the clay samples, being the entry to various chemical reactions.

© 2013 Coastal Education and Research Foundation
M. Costa, M. Rollnic, O. Silveira, A. Miranda, and R. Santos "Morphological and sedimentological processes of an Amazon Estuary, Maguari River (Pará - Northern Brazil)," Journal of Coastal Research 65(sp2), 1110-1115, (1 April 2013). https://doi.org/10.2112/SI65-188.1
Received: 7 December 2012; Accepted: 6 March 2013; Published: 1 April 2013
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