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Sources and sinks of sediments to the Amapá Coast.

Sources and sinks of sediments to the Amapá Coast. Odete Fátima Machado da Silveira Valdenira Ferreira dos Santos. FORCING MECHANISMS Large M 2 tidal amplitude at the south, near ressonance that results from a concave shoreline trend and shore-perpendicular Cabo Norte shoal;

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Sources and sinks of sediments to the Amapá Coast.

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  1. Sources and sinks of sediments to the Amapá Coast. Odete Fátima Machado da Silveira Valdenira Ferreira dos Santos

  2. FORCING MECHANISMS • Large M2tidal amplitude at the south, near ressonance that results from a concave shoreline trend and shore-perpendicular Cabo Norte shoal; • Semi diurnal tidal range producing shorenormal tidal currents changes from erosion (Southern Amapá) to shoreline accretion – mudflats north of Cabo Cassiporé;

  3. Fluid muds diminushes the bottom drag coefficient retarding the tidal waves progression; • Advection of the low salinity plume of Amazon river along the Amazon Shelf (northwest) due the interaction of: seasonal trade winds (easterly); surface gravity waves and NBC; • High suspended sediments concentration nearshore (varies temporaly and spatialy with de factors above mentioned and with the Amazon river discharge;

  4. Two more mechanisms can be add: • The pororoca phenomena; • Antrophic components.

  5. The Sources • Erosional processes; Rocinha-Araguari Rio Cassiporé

  6. Cunani • The sources • Sediment supply Uaçá Aporema

  7. The sinks of sediments

  8. 1997 1972 2000 1992

  9. Ig.Novo Ig.Novo Livramento do Bailique Sucuriju-Cabo Norte

  10. Anthropic components Artificial tidal channel Igarapé República- Estuarine Sector – Amapá coastal zone. Acervo:GERCO

  11. Depositing and re-working sediments

  12. How to study environments highly energetic with shallow waters, macrotides and high mud sedimentation/ressuspention? 750 mg/l

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