Coastal Monitoring: Technology

High temporal resolution data is gathered to help understand and monitor the environment. For example, monitoring the oxygen status and algal content of the water body can help to define algal blooms and understand their effects alongside the cycling of organic and inorganic matter. Data relating to diurnal, seasonal and episodic events can then be related to physical and chemical conditions within the water body to facilitate management and monitoring.

A McLane Remote Access Sampler is currently deployed in combination with a Seabird SBE 19 CTD (with additional fluorimetry and turbidity) on the Belfast Lough Mooring Package. The sampler is capable of taking up to 48 individual 100-ml samples over extended time periods, and preserving them for future analysis. Full GSM communication and control allows flexible sampling schedules. This system is self-cleaning, logging facilities record the details of each sampling event.

Deployment Instruments are moored beneath the only visible part of the system – either a polyethylene buoy that supports the antenna spar and solar array or a navigation platform. The instrument package is deployed beneath the buoy and securely anchored to the bottom.

In certain sites, a combination of instruments at two different depths allows processes such as stratification and its effect on water quality to be studied.

The buoy contains a GSM modem allowing data communication with the instruments from a remote base, giving near real time data on water quality and instrument function. Power supplies for the instruments and communications are self-contained, and are sufficient for long deployment in aquatic environments. Service intervals are determined primarily by biofouling and instrumental drift.

Data is transmitted to a remote base station at pre-determined intervals. In addition, all collected data are stored on internal memory units for analysis post-deployment. The nature of the relayed data and the frequency of sampling and transmission can be configured to suit the site and application. Data will be made immediately available to all interested agencies, individuals and the general public.

Water quality parameters and physical processes such as stratification can be identified and monitored. The high-resolution data allows the temporal stability of physico-chemical parameters to be monitored. The interaction between different water bodies can be investigated, aiding early warning of algal bloom events, better modeling of water stratification, and direct monitoring of water quality.