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Physical processes affecting the sedimentary environments of Long Island Sound

By:
, , ,
Edited by:
Spaulding M.L.Blumberg A.F.

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Abstract

A modeling study was undertaken to simulate the bottom tidal-, wave-, and wind-driven currents in Long Island Sound in order to provide a general physical oceanographic framework for understanding the characteristics and distribution of seafloor sedimentary environments. Tidal currents are important in the funnel-shaped eastern part of the Sound, where a strong gradient of tidal-current speed was found. This current gradient parallels the general westward progression of sedimentary environments from erosion or non-deposition, through bedload transport and sediment sorting, to fine-grained deposition. Wave-driven currents, meanwhile, appear to be important along the shallow margins of the basin, explaining the occurrence of relatively coarse sediments in regions where tidal currents alone are not strong enough to move sediment. Finally, westerly wind events are shown to locally enhance bottom currents along the axial depression of the sound, providing a possible explanation for the relatively coarse sediments found in the depression despite tide- and wave-induced currents below the threshold of sediment movement. The strong correlation between the near-bottom current intensity based on the model results and the sediment response as indicated by the distribution of sedimentary environments provides a framework for predicting the long-term effects of anthropogenic activities.

Additional Publication Details

Publication type:
Conference Paper
Publication Subtype:
Conference Paper
Title:
Physical processes affecting the sedimentary environments of Long Island Sound
Year Published:
1997
Language:
English
Publisher:
ASCE
Publisher location:
Reston, VA, United States
First page:
400
Last page:
412
Number of Pages:
13
Conference Title:
Proceedings of the 1997 5th International Conference on Estuarine and Coastal Modeling
Conference Location:
Alexandria, VA, USA
Conference Date:
22 October 1997 through 24 October 1997