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.

本资源包含在“大堡礁北部深处”调查期间，由“福尔克”号调查船（RV Falkor）使用其康士伯EM302多波束声纳系统采集的水深测量数据（bathymetry data）。本次调查中采集的EM710数据将在未来版本中发布。

该调查的主要目标是通过对堡礁附近陆架边缘和大陆坡，以及韦茅斯角以北七座孤立礁（包括大型Wreck湾内）周边区域进行地球物理测绘（geophysical mapping），探索约克角半岛区域。约克角离岸区域被视为前沿海洋区域，此前在大堡礁最北段该区域采集的多波束数据极少。本次调查旨在揭示该区域海底峡谷、沉没礁及其他重要海底特征的完整清单。

次要目标是对斯温滑坡（Swain slide）进行地球物理测绘——斯温滑坡是大堡礁南部斯温礁附近斜坡上的一处水下滑坡，其滑坡壁宽约10公里，碎屑场从滑坡壁延伸约20公里。测绘旨在揭示碎屑场的完整范围及滑坡壁近端碎屑物质的性质。

为实现这些目标，调查持续47天，于2020年9月30日从澳大利亚布里斯班出发，同年11月17日返回布里斯班。航次分为三段，期间在凯恩斯及托雷斯海峡的霍恩岛停靠港口。

地球物理测绘使用了“福尔克”号调查船（RV Falkor）上的康士伯EM302和EM710多波束系统，通常以双条带模式（Dual Swath mode）运行。在水深超过约1200米时，EM710系统关闭。两套多波束系统还采集了反向散射数据（backscatter data）和水柱数据（water column data）。

本V1数据集包含两个覆盖FK200930调查区域的64米分辨率32位GeoTIFF文件，由仅经处理的EM302水深数据生成。

本数据集不得用于导航目的。

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。