Marine renewable energy (ocean energy)

Introduction

More energy required because of growth in population and 31What's needed:–renewable energy sources–methods that won't create pollution

Wave energy

Advantage: waves provide a 32 source of renewable energyElectricity can be generated using offshore or onshore systemsOnshore systems may use a reservoir

Problems:

–waves can move in any 33–movement of sand, etc. on the 34 of the ocean may be affected

Tidal energy

Tides are more 35 than waves

Planned tidal lagoon in Wales:

–will be created in a 36 at Swansea–breakwater (dam) containing 16 turbines–rising tide forces water through turbines, generating electricity–stored water is released through 37, driving the turbines in the reverse direction

Advantages:

–not dependent on weather–no 38 is required to make it work–likely to create a number of 39

Problem:

–may ham fish and birds, e.g. by affecting 40 and building up silt

Ocean thermal energy conversion

Uses a difference in temperature between the surface and lower levelsWater brought to the surface in a pipe