Table 5.
A description of the potential impacts resulting from wind turbine projects involving no pile driving. See text, Section 3.3, for a narrative summary of this development scenario. Ecosystem components are ranked by their proportion of the major impacts. Moderate impacts are listed in the order they appear in the renewable energy impact matrix.
| (i3) Wind turbines involving no pile driving | ||
|---|---|---|
| Priority | Major impacts | Certainty |
|
| ||
| (1) Fish species and fishing activity | Loss of access to grounds during construction and operation (mobile gear) | High |
| (2) Avian species* | Displacement or attraction to structure above water surface | High |
| (3) Benthic habitat and resources | Scour and/or deposition | High |
|
| ||
| Component | Moderate impacts | Certainty |
|
| ||
| Benthic habitat and resources | (i) Resuspension of pollutants in sediments | (i) High |
| (ii) Disturbance from installation/removal of device (turbidity) | (ii) Medium | |
| (iii) Chemical spills, discharge | (iii) Medium | |
| (iv) Disturbance from installation of cable | (iv) Medium | |
| (v) Changes to current/wave regime | (v) Medium | |
|
| ||
| Fish species and fishing activity | (i) Chemical spills | (i) Medium |
| (ii) Operational noise | (ii) Medium | |
| (iii) Noise from pre-construction seismic surveys | (iii) Medium | |
| (iv) Noise from pile cutting during device removal | (iv) Medium | |
| (v) EMF | (v) Low | |
| (vi) Habitat/community composition alteration | (vi) Medium | |
| (vii) Decreased catchability during construction and operation | (vii) Medium | |
| (viii) Loss of access to grounds during construction and operation (fixed gear and recreational) | (viii) High | |
| (ix) Changes in species distribution | (ix) Low | |
| (x) Damaged/lost gear | (x) High | |
|
| ||
| Avian species | (i) Displacement or attraction to structure below water surface | (i) Medium |
| (ii) Collision with rotating turbine blades | (ii) High | |
| (iii) Pressure gradients around rotor | (iii) Medium | |
| (iv) Leakage of lubricants/fluids, release of maintenance chemicals | (iv) Medium | |
| (v) Large chemical spills | (v) High | |
|
| ||
| Marine mammals and sea turtles | (i) Entanglement with mooring lines or cables | (i) Medium |
| (ii) Strikes with installation or support vessels | (ii) High | |
| (iii) Operational noise | (iii) Medium | |
*Denotes that higher priority may be given to this component due to national/regional/local regulatory objectives and obligation.