Abalone fishing block 29 - High resolution acoustic data of reef habitat

The principle aim of this project was to map the fine-scale spatial distribution of key abalone habitat impacted by urchins in < 25 m water depth using multibeam acoustic imagery. Detailed substrate type (Pavement Reef, Megaclast Reef, Mixed Consolidated Sediment/Reef and Sand), and kelp coverage maps have been produced for the east coast of Tasmania. Large urchin barrens have been predicted and the minimum quantifiable unit of which small incipient barrens can be detected has been identified using this acoustic water column technique.This data provides a snapshot of the 2021 distribution of seafloor habitats and associated vegetation distribution, and will assist in the facilitation of strategic decision making for urchin control and abalone management.Data for download has been split by fishing block (22-24, 27-30). This record describes *FISHING BLOCK 29*. The following data products are available for download, for each fishing block:• 50cm resolution bathymetry• 50cm resolution substrate type (Seamap Australia classification)• bathymetry derivatives (seabed slope, curvature, rugosity, 1 and 2m contours)• water column data - 1m mean signal• water column data - 9m2 raw block statistic• water column data - vegetation likelihood classificationSee associated records for access to data from other fishing blocks (22, 23, 24, 27, 28, 30).

本项目的核心目标为借助多波束声呐成像技术，绘制水深小于25米海域内受海胆影响的鲍鱼关键栖息地的精细空间分布格局。研究团队已为塔斯马尼亚东海岸区域，制作了详细的底质类型专题地图，涵盖硬质礁滩（Pavement Reef）、巨砾礁滩（Megaclast Reef）、混合固结沉积物/礁滩（Mixed Consolidated Sediment/Reef）以及沙质底质（Sand），同时完成了海带覆盖度专题地图。本研究利用该声学水体探测技术，完成了大型海胆荒区的预测，并确定了可量化的最小识别单元，以此可实现小型初始海胆荒区的探测。本数据集提供了2021年海底栖息地及伴生植被分布的快照，将为海胆防控与鲍鱼管理的战略决策制定提供支撑。可供下载的数据按捕捞区块（22-24、27-30）进行拆分，本记录所描述的为**捕捞区块29**。针对每个捕捞区块，均可下载以下数据产品：
• 50厘米分辨率水深地形数据
• 50厘米分辨率底质类型数据（采用澳大利亚海图（Seamap Australia）分类标准）
• 水深地形衍生数据（海床坡度、曲率、粗糙度、1米及2米等高线）
• 水体柱数据——1米平均信号
• 水体柱数据——9平方米原始区块统计量
• 水体柱数据——植被可能性分类数据
可通过关联记录获取其他捕捞区块（22、23、24、27、28、30）的数据。