Offshore Sediments

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Offshore sediments refer to the accumulation of particulate matter, including sand, silt, and clay, found on the seabed beyond the intertidal zone. These sediments are shaped by marine processes such as currents, waves, and biological activity, playing a crucial role in marine ecosystems, sedimentology, and geological studies.

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An Examination of the Offshore Bathymetry and Sedimentology of Cocos Bay, Trinidad.

by Junior Darsan Ph.D.

2012

Cocos Bay, Trinidad has a very dynamic system owing to the open bay morphology, and being exposed to the Atlantic Ocean. It is apparent that the interplay of coastal processes, sediment characteristics, and coastline orientation account... more

FIGURE 2: The equipment used in conducting the Hydrographic Survey

FIGURE 3: Predicted Tides for Guayaguayare Bay and Nariva River SOURCE: Admiralty Tide Programme

FIGURE 4: Bathymetry Contour Map of Trinidad ’s East Coast SOURCE: Author - digitized from Bathymetric Maps of Trinidad’s East Coast from Lands & Surveys Hydrographic Unit, 1985

FIGURE 5: Types of Bedforms (a) Current Ripples (b) Wave Ripples (c) Sandwaves/Dunes (d) Breaker Bar SOURCE: Soulsby (1997)

Atsite 3 (Figure 8), the wavelength of the megaripples ranged between 50-60m and so did the surface wavelengths, at a depth of 4-5m offshore. At site 5 the megaripples had a wavelength between 35-45m while the surface wavelengths were between 50-60m. At site 6, a noted reduction in surface wavelengths of 35-50m was also reflected in reduced megaripple wavelengths of 25-35m. As the surface wavelengths continued to decrease down the bay at sites 8B (30-40m) and 9B (25-40m), instead of megaripples, ripples on sandwaves were seen in the offshore region (Figure 9).

FIGURE 8: Aerial photo of Site 3 showing offshore environment SOURCE: Author's work adapted from 1994 aerial photos from Lands é Surveys Division, Port-of-Spain

FIGURE 9: Aerial Photo of Site 9B Showing the Offshore Environment SOURCE: Autho's work adapted from 1994 aerial photos from Lands & Surveys Division, Port-of-Spain

FIGURE 10: The Silt/Clay Ratio of the Offshore Sediments SOURCE: Author SOURCE: Author ’s Fieldwork

FIGURE 11: Offshore Sediment Comparison from 10m Water Depth at 5 Site: SOURCE: Author’s Fieldwork

FIGURE 12: Offshore Sediment Comparison for Various Water Depths SOURCE: Author’s Fieldwork

TABLE 1: Folk and Ward Parameters for Offshore Sediment

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Offshore Sediments

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