Northern Depths of the Great Barrier Reef bathymetry survey (FK200930/GA4866)

This resource includes bathymetry data acquired during the Northern Depths of the Great Barrier Reef survey on RV Falkor using its Kongsberg EM302 multibeam sonar system. The EM710 data acquired on this survey will be included in a future release.The primary objective of the survey was to explore the Cape York Peninsula region, through geophysical mapping of the shelf edge and continental slope adjacent to the barrier reefs and around the seven detached reefs lying north of Cape Weymouth, including within the large Wreck Bay. The offshore Cape York area is considered a frontier marine region with very little multibeam data collected previously in this far northern section of the Great Barrier Reef. The survey aimed to reveal the full inventory of submarine canyons, drowned reefs and any other significant seabed features in the region.A secondary objective was to conduct geophysical mapping of the Swain slide, an underwater landslide on the slope adjacent to the Swain Reefs in the southern Great Barrier Reef, with a headscarp about 10 km wide and a debris field extending ~20 km from the headscarp. The mapping aimed to reveal the full extent of the debris field and nature of the debris material proximal to the headscarp.Another objective was to conduct geophysical mapping around the steeper slopes around reefs in the eastern Coral Sea Marine Park, including the Saumarez, Frederick, Kenn, Wreck and Cato Reefs. The mapping aimed to fill data gaps between existing airborne LIDAR bathymetry over the shallow reefs and previously collected multibeam data around the steeper flanks. To achieve these objectives, the survey extended over 47 days, leaving Brisbane, Australia on September 30, 2020 and returning to Brisbane, Australia on November 17, 2020. The voyage was split into three legs, with port calls made at Cairns and Horn Island in the Torres Strait.Geophysical mapping involved the use of both Kongsberg EM302 and EM710 multibeam systems on the RV Falkor, typically operated in Dual Swath mode. In depths deeper than ~1200 m, the EM710 was turned off. Backscatter and water column data were also collected on both multibeam systems.This V1 dataset contains two 64m resolution 32-bit geotiff files of the FK200930 survey area produced from the processed EM302 only bathymetry data.This dataset is not to be used for navigational purposes.This dataset is published with the permission of the CEO, Geoscience Australia.

本数据集涵盖由RV Falkor号科考船在“大堡礁北部海域科考航次”期间，搭载康斯伯格（Kongsberg）EM302多波束声呐系统采集得到的水深测深数据。本次航次采集的EM710系统相关数据将在后续版本发布。

本航次的首要目标为对约克角半岛海域开展勘探：通过对毗邻堡礁的陆架边缘与大陆坡，以及韦茅斯角以北的七座独立离岸礁（包括大型沉船湾海域）开展地球物理测绘。约克角半岛远海区域属于海洋勘探前沿海域，此前在大堡礁最北部片区采集的多波束数据极为匮乏，本次航次旨在全面摸清该区域内海底峡谷、淹没礁及其他重要海底地貌的分布情况。

本航次的次要目标为测绘斯温滑坡——一处位于大堡礁南部斯温礁毗邻大陆坡的海底滑坡，该滑坡的滑坡壁宽约10公里，碎屑堆积区从滑坡壁向外延伸约20公里。本次测绘旨在明确碎屑堆积区的完整范围，以及滑坡壁附近碎屑物质的性质。

另一项目标为对珊瑚海海洋公园东部各礁体周边的陡坡海域开展地球物理测绘，涵盖索马雷兹礁、弗雷德里克礁、肯恩礁、沉船礁与卡托礁。本次测绘旨在填补浅礁区域现有机载激光雷达（LIDAR）测深数据与陡坡周边此前采集的多波束数据之间的数据空白。

为达成上述目标，本航次历时47天，于2020年9月30日从澳大利亚布里斯班起航，2020年11月17日返回布里斯班。本次航次分为三个航段，中途停靠了托雷斯海峡的凯恩斯与霍恩岛。

本次地球物理测绘在RV Falkor号上搭载了康斯伯格EM302与EM710两套多波束系统，通常采用双条带测绘模式作业。在水深约1200米以上的海域，将关闭EM710系统。两套多波束系统同时采集了后向散射数据与水柱数据。

本V1版本数据集包含两份分辨率为64米、32位的GeoTIFF文件，覆盖FK200930航次作业区，数据由仅基于EM302系统处理得到的测深数据生成。

本数据集不得用于航行导航用途。

本数据集经澳大利亚地球科学局（Geoscience Australia）首席执行官许可发布。