Tracklines of a multibeam survey of the sea floor in the Historic Area Remediation Site in 1998 (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”号舰艇上的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，HARS）开展海底水深测量（bathymetry）与后向散射强度（backscatter intensity）调查。本次多波束测深调查的核心目标，是在疏浚物料被倾倒至HARS以修复受污染沉积物的全过程中，对海底水深与表层沉积物（surficial sediments）进行时序性测绘。由多波束测深调查生成的成果地图，以3米的空间分辨率（spatial resolution）展示了海底水深、晕渲水深地貌图（shaded-relief bathymetry）以及后向散射强度——该指标用于量化海底纹理与粗糙度。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（U.S. Army Corps of Engineers）共同完成，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。