IMOS - ACORN - Rottnest Shelf HF ocean radar site (Western Australia, Australia) - Real-time sea water velocity

The Rottnest Shelf (ROT) HF ocean radar system covers an area which includes Rottnest Island and the Perth Canyon to the north-west. The Perth Canyon has the highest marine biodiversity in the region with whale and fish aggregations, and high primary and secondary productions which are controlled by the physical oceanographic processes.

Combined with the dynamics of the Perth Canyon is the dominant Leeuwin Current which produces a wake on the leeward side of Rottnest Island. This is a topographically induced up-welling and associated primary and secondary productivity. The region is influenced by Swan River outflow, submarine groundwater discharges , and waste-water outfalls.

The ROT HF ocean radar is a WERA phased array system with 16-element receive arrays located at Fremantle (32.031 S, 115.746 E) and Guilderton (31.342 S, 115.489 E). These radars operate at a frequency of 8.512 MHz, with a bandwidth of 33 KHz and a maximum range of 200 Km. Within the HF radar coverage area surface currents are measured. Data are also collected from which wind directions and significant wave height can be calculated.

The ROT area of coverage has a small overlap of commonly observed ocean with the Turqoise Coast (TURQ) SeaSonde HF ocean radar system on its north side. Together, the ROT and TURQ systems provide continuous monitoring of the shelf from Fremantle to Jurien Bay.

罗特内斯特陆架（Rottnest Shelf, ROT）高频（High Frequency, HF）海洋雷达系统的覆盖范围涵盖罗特内斯特岛以及西北侧的珀斯峡谷。珀斯峡谷是该区域海洋生物多样性最高的海域，聚集有鲸类与鱼类群集，且初级、次级生产力水平极高，这一特性受物理海洋学过程调控。

主导该区域的李汶海流（Leeuwin Current）与珀斯峡谷的动力学特征相互作用，在罗特内斯特岛背风侧形成尾流，该现象属于地形诱导的上升流及其伴生的初级、次级生产力过程。本区域同时受天鹅河径流、海底地下水排放以及污水排海口的影响。

ROT高频海洋雷达为WERA相控阵系统，分别在弗里曼特尔（32.031°S，115.746°E）和吉尔德顿（31.342°S，115.489°E）部署了16元接收阵列。两部雷达工作频率为8.512 MHz，带宽33 kHz，最大探测距离200千米。在高频雷达覆盖区域内可测量表层海流，同时可通过采集的数据反演风向与有效波高。

ROT系统的覆盖区域北侧与绿松石海岸（Turquoise Coast, TURQ）SeaSonde高频海洋雷达系统的观测海域存在少量重叠。二者协同可实现从弗里曼特尔到朱里恩湾的陆架连续监测。