IMOS - ACORN - Rottnest Shelf HF ocean radar site (Western Australia, Australia) - Delayed mode 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及其西北方向的珀斯峡谷。珀斯峡谷是该区域海洋生物多样性最高的海域，存在大量鲸类与鱼类集群，且初级、次级生产力水平较高，这些特征均受物理海洋过程调控。主导该区域的李予文海流（Leeuwin Current）与珀斯峡谷的动力过程相互作用，会在罗特内斯特岛的背风侧形成尾迹，该尾迹对应由地形诱导产生的上升流及与之相关的初级、次级生产力活动。该区域还受天鹅河径流、海底地下水排放与污水排放口的影响。ROT高频海洋雷达采用WERA相控阵系统，配备16元接收阵列，部署于弗里曼特尔（32.031°S，115.746°E）与吉尔德顿（31.342°S，115.489°E）。该雷达工作频率为8.512 MHz，带宽33 kHz，最大探测距离达200千米。在其覆盖范围内可获取表层海流观测数据，同时还能通过采集到的信号反演风向与有效波高。ROT的覆盖范围在北侧与绿松石海岸（Turqoise Coast, TURQ）SeaSonde高频海洋雷达系统的观测海域存在少量重叠。两套系统协同工作，可实现从弗里曼特尔到朱里恩湾的陆架海域连续监测。