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Initial results of high-resolution sea-floor mapping offshore of the New York - New Jersey metropolitan area using sidescan sonar

Northeastern Geology and Environmental Sciences

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Abstract

High-resolution seismic, sidescan-sonar, multibeam bathymetry, and sediment sampling techniques were used to map the surficial geology and shallow subbottom stratigraphy of a segment of the inner shelf and nearshore region of New York-New Jersey metropolitan area. Preliminary analyses of these data provide a sedimentologic framework for addressing a wide range of science and management issues. Principal features identified include: 1) a series of sharply defined, rippled scour depressions in the nearshore areas of Long Island and New Jersey that are thought to be an erosional pattern indicative of storm-induced cross-shelf sediment-transport processes from the shoreface; 2) outcropping Upper Cretaceous to early Tertiary coastal plain strata and associated gravelly lag deposits; 3 ) morphologic and chemical indications of anthropogenic waste disposal and redistribution; 4) extensive deposits of medium- to fine-grained sand northeast and east of the Hudson Shelf Valley; 5) acoustic backscatter patterns on the sidescan imagery and sediment bedforms that indicate a general south-southwest sediment transport direction toward the Hudson Shelf Valley; and 6) the Hudson Shelf Valley is a depositional site for silty sediment and acts as a conduit for cross-shelf pollutant transport.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Initial results of high-resolution sea-floor mapping offshore of the New York - New Jersey metropolitan area using sidescan sonar
Series title:
Northeastern Geology and Environmental Sciences
Volume
19
Issue:
4
Year Published:
1997
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
243
Last page:
262
Number of Pages:
20