Long-Term Sand Cap Stability: New York Dredged Material Disposal Site

摘要

A comprehensive physical oceanographic field study was conducted in November 1986 to determine the bathymetry of the New York Mud Dump site and assess the long-term stability of an experimental sand cap, or mud damp (EMD), located in the southeast quadrant of the site. Results of a precision bathymetric survey were compared with results from surveys conducted in 1980 and 1981. A REMOTS sediment-profile survey was conducted over the entire site, and a subbottom profiling survey was conducted at the EMD. A significant accumulation of sediment was found at the dredged material disposal point in the northeast quadrant, and decreases in depth to the south and east of this point indicated accumulation of dredged material beyond the eastern boundary of the site. Significant erosion of the sand cap was not detected, and clean sand representing the final cap material was found to persist in a continuous layer in the center of the EMD. Keywords: Dredged material (WES), Environmental impact analysis (LC), Sand (LC). (JES)