The Creation of High Resolution Bathymetry Grids for the Lord Howe Island Region
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Detailed seabed bathymetric data are needed to better understand our marine environment because models of seabed morphology derived from these data provide useful insights into physical processes that act on the seabed and the location of different types of seabed habitats. Lord Howe Island lies approximately 450km off the northern coast of New South Wales. It is a volcanic island with a fringing coral reef on its western shore, and a shallow (20 - 120 m) shelf surrounds the island. Bathymetry data are required in this area to help identify major seabed processes and habitats, especially relict reef structures, and to measure how well physical seabed properties act as surrogates of patterns of biodiversity on this mid-ocean carbonate shelf. The data are also required to enable modelling of tsunami as they interact with the shelf around the island and the coast. This report describes the methodology employed in creating detailed bathymetry data grids of the Lord Howe Island region. It covers data collection, quality control and gridding. Descriptions are provided of each dataset employed, the methods used to integrate the different datasets and the attributes of the new bathymetry models. Four new bathymetry grids are presented, including grids that integrate bathymetry with the island's topography.
为更好地认知海洋环境，我们亟需高精度海底测深数据（seabed bathymetric data）：由该类数据衍生的海底地貌模型，可为作用于海底的物理过程以及不同类型海底生境的分布提供宝贵的认知视角。豪勋爵岛（Lord Howe Island）位于新南威尔士州北海岸外约450公里处，是一座火山岛，其西岸发育有岸礁，岛屿周边环绕着水深20至120米的浅海大陆架。该区域亟需测深数据（bathymetry data），以助力识别主要海底过程与生境（尤其是遗迹礁构造），并评估海底物理属性作为该洋中碳酸盐岩架生物多样性分布替代指标的有效性。此外，该数据还可用于开展海啸与岛屿周边陆架及海岸相互作用的模拟研究。本报告详述了豪勋爵岛区域高精度海底测深数据网格的构建方法，涵盖数据采集、质量控制与网格生成三个环节。报告对所用的各类数据集、整合多源数据集的方法，以及新型测深模型的属性均作出了详细说明。本次共展示了四套新型测深网格，其中一套融合了测深数据与该岛屿的地形数据。
