Tracklines of a multibeam survey of the Hudson Shelf Valley carried out in 1998 (polyline shapefile, geographic, WGS 84)

The Hudson Shelf Valley is the submerged seaward extension of the ancestral Hudson River drainage system and is the largest physiographic feature on the Middle Atlantic continental shelf. The valley begins offshore of New York and New Jersey at about 30-meter (m) water depth, runs southerly and then southeasterly across the Continental Shelf, and terminates on the outer shelf at about 85-m water depth landward of the head of the Hudson Canyon. Portions of the 150-kilometer-long valley were surveyed in 1996, 1998, and 2000 using a Simrad EM1000 multibeam echosounder mounted on the Canadian Coast Guard ship Frederick G. Creed. The purpose of the multibeam echosounder surveys was to map the bathymetry and backscatter intensity of the sea floor of the valley, providing a framework for geologic, oceanographic, and geochemical studies. The data from the three surveys are combined to produce grids of bathymetry and backscatter intensity at 12-m resolution that cover the entire valley and the head of the Hudson Canyon. The mapping was done by the U.S. Geological Survey in cooperation with the U.S. Army Corps of Engineers with support from the Canadian Hydrographic Service and the University of New Brunswick.哈德逊陆架谷（Hudson Shelf Valley）是古哈德逊河水系被淹没的向海延伸部分，为大西洋中部大陆架上规模最大的地貌单元。该谷始于纽约与新泽西近岸约30米水深处，先向南、再向东南方向横跨大陆架，最终终止于哈德逊峡谷口内侧约85米水深的外陆架区域。这条总长150千米的谷体的部分区域，于1996、1998及2000年通过搭载于加拿大海岸警卫队“弗雷德里克·G·克里德”号（Canadian Coast Guard ship Frederick G. Creed）的Simrad EM1000多波束测深仪完成勘测。本次多波束测深勘测旨在绘制该谷体海底的水深地形与背散射强度分布，为地质、海洋学及地球化学研究提供基础框架。三次勘测所得数据被整合为分辨率12米的水深地形与背散射强度网格，覆盖了整个谷体及哈德逊峡谷口区域。本次制图工作由美国地质调查局（U.S. Geological Survey）与美国陆军工程兵团（U.S. Army Corps of Engineers）合作开展，并获得加拿大海道测量局（Canadian Hydrographic Service）与新不伦瑞克大学（University of New Brunswick）的支持。