Land-Based nd near-shore facilities:
Three Main Advantages
1 Do not require complex mooring,
lengthy power cables, or the expensive maintenance needed for open-ocean environments.
2 Located in sheltered areas,
they are relatively safe from storms and heavy seas. Electricity, desalinated water, and cold, nutrient-rich seawater could
be transmitted more easily via trestle bridges or causeways.
3 Operations with mariculture are
possible. Ones that require desalinated water can be greatly helped.
Favored locations include those with narrow shelves (volcanic islands), steep
(15-20 deg) offshore slopes, and relatively smooth sea floors. These sites minimize the length of the cold-water intake pipe.
A disadvantage of land-based facilities comes from turbulent wave action in
the surf zone. The plant's discharge pipes as well as its water supply should be buried in protective trenches,
to shield them from storms and heavy seas. The mixed discharge (of cold and warm seawater) must be taken hundreds
of meters offshore to reach the appropriate depth before release. This can require greater expenses and more construction.