Backscatter grid of the Gnaraloo survey area (Carnarvon Shelf)

Geoscience Australia carried out a marine survey on Carnarvon shelf (WA) in 2008 (SOL4769) to map seabed bathymetry and characterise benthic environments through colocated sampling of surface sediments and infauna, observation of benthic habitats using underwater towed video and stills photography, and measurement of ocean tides and wavegenerated currents. Data and samples were acquired using the Australian Institute of Marine Science (AIMS) Research Vessel Solander. Bathymetric mapping, sampling and video transects were completed in three survey areas that extended seaward from Ningaloo Reef to the shelf edge, including: Mandu Creek (80 sq km); Point Cloates (281 sq km), and; Gnaraloo (321 sq km). Additional bathymetric mapping (but no sampling or video) was completed between Mandu creek and Point Cloates, covering 277 sq km and north of Mandu Creek, covering 79 sq km. Two oceanographic moorings were deployed in the Point Cloates survey area. The survey also mapped and sampled an area to the northeast of the Muiron Islands covering 52 sq km.. gnaraloo_3m is an ArcGIS layer of the backscatter grid of the Gnaraloo survey area produced from the processed EM3002 backscatter data of the survey area using the CMST-GA MB Process This dataset is a contribution to the CERF Marine Biodiversity Hub.

澳大利亚地质调查局（Geoscience Australia）于2008年针对西澳大利亚州（WA）的卡那封陆架（Carnarvon shelf）开展了编号为SOL4769的海洋调查，旨在通过同步采集表层沉积物与底内生物样本、采用水下拖曳视频与静态摄影观测底栖生境、测量海洋潮汐与浪生流，完成海底水深制图并表征底栖环境特征。本次调查的数据与样本均由澳大利亚海洋科学研究所（Australian Institute of Marine Science, AIMS）的“索兰德号（Solander）”科考船获取。

水深制图、采样及视频样带作业均在三个从宁格鲁礁向陆架边缘向海延伸的调查区域内完成，这些区域分别为曼杜溪（80平方千米）、克洛阿特斯角（281平方千米）以及纳拉鲁（Gnaraloo，321平方千米）。此外，在曼杜溪与克洛阿特斯角之间（覆盖277平方千米）及曼杜溪以北区域（覆盖79平方千米）开展了未附带采样与视频作业的额外水深测绘工作。在克洛阿特斯角调查区内，共部署了两套海洋学锚系观测装置。本次调查还对缪伦群岛东北部52平方千米的海域完成了测绘与采样工作。

gnaraloo_3m为对应纳拉鲁（Gnaraloo）调查区的ArcGIS图层，基于该调查区经处理的EM3002多波束反向散射数据，通过CMST-GA MB Process工具生成，对应该区域的反向散射网格。本数据集是CERF海洋生物多样性中心（Marine Biodiversity Hub）的相关产出成果。