Tracklines of a multibeam survey of the sea floor in the Historic Area Remediation Site in 2000 (polyline shapefile, geographic, 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年及2000年，研究人员搭载于加拿大海岸警卫队“弗雷德里克·G·克里德”号（Frederick G. Creed）科考船的Simrad EM1000多波束测深仪（multibeam echosounder），对纽约州与新泽西州近海的历史区域修复场地（Historic Area Remediation Site，HARS）开展海底地形测量与后向散射强度调查。本次多波束测深调查的核心目标，是追踪疏浚物料被投放入历史区域修复场地以修复受污染沉积物的全过程，及时绘制不同时段的海底地形与表层沉积物分布图。基于本次多波束调查数据生成的专题图件，包含空间分辨率为3米的海底地形、晕渲海底地形以及后向散射强度（用于表征海底质地与粗糙度的指标）三类成果。本次调查区域的制图工作由美国地质调查局（U.S. Geological Survey）联合美国陆军工程兵团（U.S. Army Corps of Engineers）开展，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。