Lizard Island Sensor Relay Pole 2 (RP2)

Brief description

A 6m galvanized pole has been deployed in the eastern part of the lagoon in behind Seabird Islet. The Relay Pole has three functions. The first is to propagate the wireless network through which the buoys talk and so it forms part of the network backbone talking directly to Relay-Pole 1. The second function is that a vaisala WXT520 weather station is mounted on the top and so this pole provides above water met observations. These include air temperature, humidity, air pressure, wind speed and direction and rainfall.The third function is that a sensor string is attached to the pole, the sensor string runs through a channel in Seabird Islet across the exposed seaward reef flat to the reef crest and then down the reef slope to around 20m. This gives a profile down the reef slope and gives readings of the water coming onto the reef complex.The pole has two Campbell Scientific loggers (one for the weather station, one for the sensors), spread-spectrum radio and 2.4/5 GHz 802.11 wireless for communicating with the base station (located at the workshop near the Research Station). The sensor string as of August 2010 has a SeaBird SBE37 at the end of the sensor string (around 230m out from the pole), and two SeaBird SBE39's located at teh reef crest and down at the start of the reef slope.The unit will be serviced every six months and will be used in the future for attaching new sets of sensors.
The Pole is part of a larger deployment at Lizard Island consisting of four buoys and two relay-poles being deployed as part of the GBROOS Project. The design looks to measure the water within the lagoon as well as water impinging onto the reef and potentially any upwelling or movement of warm water that may cause thermal stress such as coral bleaching. The Relay Pole serves to form the network backbone using 2.4/5 GHz 802.11 wireless and Campbell 900 MHz spread spectrum radio's to communicate. The pole talks directly to RP1 on Plafrey Island which in urn talks to the base station at the research station. The pole also talks to buoys in its immediate range.The pole also houses a Vaisala WXT520 weather station and has an inductive modem / coupler that attaches inductive instruments to the pole. The inductive cable / sensor string runs east around Seabird Islet across the reef flat, down the reef crest into the reef front to around 20m.

Lineage

Maintenance and Update Frequency: asNeeded

Statement: Statement: All sensors are factory calibrated and serviced every six months.Statement: Data are checked against a set of rules and then flagged using the IODE set of flags.

Notes

Credit
Bainbridge, Scott, Mr (Point Of Contact)