Abalone fishing block 27 - 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 27*. 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, 28, 29, 30).

本项目的核心目标为利用多波束声呐影像，绘制水深小于25米范围内受海胆影响的关键鲍鱼栖息地的精细空间分布格局。研究团队已针对塔斯马尼亚东海岸生成详细的底质类型（涵盖硬质礁盘、巨砾礁、混合固结沉积物/礁体以及沙质底）与海藻覆盖度地图。本研究采用水体声学探测技术，完成了大型海胆荒区域的预测，并确定了可量化检测小型初期海胆荒的最小识别单元。
本数据集呈现了2021年海底栖息地及相关植被分布的快照，将为海胆防控与鲍鱼资源管理的战略决策提供支撑。
下载数据按捕捞区块（22-24、27-30）进行了拆分，本记录描述的是**捕捞区块27**。针对每个捕捞区块，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（含海底坡度、曲率、粗糙度，以及1米与2米等深线）
• 水体声学探测数据——1米平均信号值
• 水体声学探测数据——9平方米原始区块统计值
• 水体声学探测数据——植被概率分类结果

请参阅相关关联记录，获取其他捕捞区块（22、23、24、28、29、30）的数据集。