GeoTIFF image of the shaded-relief bathymetry of the sea floor, colored by backscatter intensity, of the Historic Area Remediation Site in 1996 (3-m resolution, Mercator, WGS 84)

Surveys of the bathymetry and backscatter intensity of the sea floor of the Historic Area Remediation Site (HARS), offshore of New York and New Jersey, were carried out in 1996, 1998, and 2000 using a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard ship Frederick G. Creed. The objective of the multiple echosounder surveys was to map the bathymetry and surficial sediments over time as dredged material was placed in the HARS to remediate contaminated sediments. Maps derived from the multibeam surveys show sea-floor bathymetry, shaded-relief bathymetry, and backscatter intensity (a measure of sea-floor texture and roughness) at a spatial resolution of 3 meters. The area was mapped by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers and with support from the Canadian Hydrographic Service and the University of New Brunswick.

1996年、1998年与2000年，研究团队依托搭载于加拿大海岸警卫队“弗雷德里克·G·克里德”号（Frederick G. Creed）船上的Simrad EM1000多波束测深仪（multibeam echosounder），对纽约州与新泽西州外海的历史区域修复场地（Historic Area Remediation Site，简称HARS）开展了海底水深测绘与背散射强度调查。本次多波束测深调查的核心目标为：在疏浚物料被投放至HARS以修复受污染沉积物的过程中，随时间序列绘制海底水深与表层沉积物分布图。由多波束调查生成的成果地图以3米的空间分辨率，展示了海底水深数据、晕渲地貌水深图以及背散射强度——该指标为海底质地与粗糙度的量化表征参数。本次海域测绘工作由美国地质调查局（U.S. Geological Survey）联合美国陆军工程兵团完成，并获得加拿大水文局与新不伦瑞克大学的支持。