Abalone fishing block 28 - 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 28*. 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, 29, 30).

本项目的核心宗旨是利用多波束声呐成像（multibeam acoustic imagery）技术，绘制水深小于25米范围内受海胆（urchins）影响的关键鲍鱼（abalone）栖息地的精细空间分布格局。针对塔斯马尼亚东海岸，已生成详细的底质类型（包括硬质礁盘、巨砾礁、混合固结沉积物/礁体以及沙质底）和巨藻（kelp）覆盖度地图。本研究通过该声学水柱探测技术，完成了大型海胆荒区（urchin barrens）的预测，并确定了可量化检测小型初期海胆荒区的最小单元。
本数据集呈现了2021年海底栖息地及相关植被分布的快照，将为海胆管控与鲍鱼资源管理的战略决策提供支撑。可供下载的数据按捕捞区块（22-24、27-30）进行了划分，本记录针对**捕捞区块28**进行说明。每个捕捞区块可下载以下数据产品：
• 50厘米分辨率水深地形（bathymetry）数据
• 50厘米分辨率底质类型数据（采用澳大利亚海图分类标准）
• 水深地形衍生数据（海底坡度、曲率、粗糙度，以及1米和2米等深线）
• 水柱数据——1米平均信号强度
• 水柱数据——9平方米原始区块统计量
• 水柱数据——植被概率分类结果
可通过关联记录获取其他捕捞区块（22、23、24、27、29、30）的相关数据。