GeoTIFF image of the backscatter intensity of the sea floor 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，研究团队借助搭载于加拿大海岸警卫队“弗雷德里克·G·克里德”号科考船的Simrad EM1000多波束测深仪，对纽约与新泽西近海的历史区域修复场址（Historic Area Remediation Site, HARS）开展了海底水深与反向散射强度调查。本次多波束测深调查的核心目标，是追踪疏浚物料被倾倒至该场址以修复受污染沉积物的全过程中，海底水深与表层沉积物随时间的变化情况，完成对应的时空分布制图。由多波束调查生成的成果地图包含空间分辨率为3米的海底水深图、阴影浮雕水深图，以及反向散射强度图——该参数可用于表征海底的纹理与粗糙度。本次调查由美国地质调查局（U.S. Geological Survey）联合美国陆军工程兵团（U.S. Army Corps of Engineers）共同实施，并得到加拿大水文局（Canadian Hydrographic Service）与新不伦瑞克大学（University of New Brunswick）的技术支持。