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Wave
Environment
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Hydrodynamic environment
Devices could act as coastal protection and change the flow patterns of sediment, which would require sensitive site selection.

Artificial habitats
Devices could attract and promote marine biodiversity.

Noise pollution
Any noise intrusion would come primarily from the Wells turbines of shoreline/nearshore Oscillating Water Columns, though these can be soundproofed.
Navigational Hazards
Adequate visual and radar warning devices can be built into most wave power machines.

Visual and environmental impacts
There may be some impacts associated with the line required to transmit electricity to shore and to the grid.

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