GeoTIFF image of the backscatter intensity of the sea floor of the Historic Area Remediation Site in 2000 (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”号科考船的西姆拉德EM1000多波束测深仪（Simrad EM1000 multibeam echosounder），对纽约与新泽西近岸的历史区域修复场地（Historic Area Remediation Site，HARS）开展了海底水深地形与后向散射强度调查。本次多波束测深调查的研究目标为：针对向HARS投放疏浚物料以修复受污染沉积物的过程，开展时序化的海底水深地形与表层沉积物制图。由多波束调查数据生成的成果地图，以3米的空间分辨率展示了海底水深地形、晕渲水深地形以及后向散射强度——后者为海底纹理与粗糙度的量化表征指标。本区域的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，并获得了加拿大水文局与新不伦瑞克大学的支持。