Re ECF Project: 6/2006

Project Title: To establish a three dimensional, real-time marine environment monitoring system in the Hoi Ha Wan Marine Park with connection to the internet.

Applicant: City University of Hong Kong

Project Proponent: Dr Robin Sarah BRADBEER

Total Approved Grant: $116,609.81

Duration: June 2007 to September 2008

Project Status/Remarks: Completed

Scope:
To extend the existing 2-dimensional marine area monitoring being carried out by the City University DataBuoy I to a three dimensional monitoring system with the addition of two more units in the Hoi Ha Wan Marine Park. 

Summary of Findings/Outcomes:
The first finding of the project was the need to design a sensor box that was strong enough to survive boat collisions. With the continued commercial fishing within the Hoi Ha Wan marine Park, especially at night, the buoys were regularly being netted and struck by boats. This caused problems with the first sensor designs.

It is important to understand that the data collection period occurred over the commissioning period only. The expiry of the lease at the centre meant that the equipment had to be removed after commissioning. Nevertheless valid data sequences were collected and analysed. This proved the system function.

The DataBuoy project revealed several marine conditions that were hypnotized but not yet detected. These had to do with cold water inversion layers and low salinity groundwater seeping up through the seabed. The net combined result was the creation of deep water hypoxia. Within the localized area of the DataBuoys, it was possible to predict a localized deep water hypoxia based upon rainfall data and the temperature of the seawater near the seabed.