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For more information, please contact Christian Baresel.
christian.baresel@ivl.se
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Monitoring loads, behavior and performance of the pilots

Besides the monitoring of parameters such as waves and currents, the demonstration

units as such have to be surveyed to enable a proper evaluation of the technology

regarding environmental, practical and cost-effectiveness aspects.

Flow rate
One of the most crucial parameters that has to be monitored is the flow rate of the demonstration units. This is especially important for the wave-powered unit in the
Hanöbukten because the wave-driven device will show high variations in the flow rate and thus the calculated pumping rate. In order to facilitate a good evaluation of
the pump efficiency, however, a correct estimate of the average pumping rate has to be obtained from the flow measurements.
Even the electrical pump needs a flow meter in order to calculate an average pumping rate which is crucial for the evaluation and the planned modelling of longterm and large-scale effects based on the demonstration period. The measured flow will also be used to optimize the pump placement in the daily operation and the final pump design.

Morning forces
The daily operation, up-scaling calculations at the end of the project but also the evaluation of the cost-efficiency of the demonstration units require the monitoring
of forces and behaviours of the demonstration units. During the described basin test morning forces have been obtained and used for dimensioning the demonstration units. During the operation load cells are used to record actual loading on the structure and morning in order to evaluate the construction after the demonstration period.

Stability
The behaviour of the wave-powered demonstration unit was investigated in the described basin tests. This is important in order to get indications about the proper
design and dimensioning of the demonstration unit. After installation, pressure gauges placed both outside the construction and inside the main basin provide
information about the unit movement. This information can then be combined with measured wave parameters, currents and weather observations.

Position and mode
To monitor the position of the demonstration unit is an important parameter as the device is constructed in a way that it will follow the main wave direction to
optimize the overtopping of waves. The wave-powered unit will therefore be equipped with a GPS localisation system. Further, pressure meters inside the demonstration unit enable the monitoring of the mode, i.e. the angle which effects the overtopping of waves, of the unit. This information will also be used to optimize the units´ mode to local wave conditions.

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