Abstract
About the artificial algae zone added to the offshore structures, we examined the elementary method, the characteristic of algae zone and construction examples. Moreover, from examples of failure, the influence and the countermeasures of grazing pressure were shown.
Next, the numerical model which predicts existing quantity of algae was developed, as the evaluation method of the structure which were added the artificial algae reclamation. The characteristic of this model is considering the environmental factor of offshore environment, and the grazing pressure.
The first conclusion of this research is, the relation of algae existing quantity was able to be clarified with offshore environment, the ecology characteristic, and the grazing pressure. The second conclusion is, proper wave condition generates the current which controls the grazing pressure. The third conclusion is, water depth which can obtain proper light, generation of sufficient algae zone is expectable.
