海岸構造物の建設によるCO_2排出と供用後の藻場形成に伴うCO_2固定に基づく環境負荷低減効果の評価

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In recent years, various types of coastal structures have been increasingly constructed using rubble mound covered with concrete armor blocks. The large amounts of resources used for these structures and greenhouse gas emitted from their construction have a strong impact on the environment, requiring consideration. On the other hand, it has been pointed out that seaweed tends to grow on concrete blocks placed under the sea and seaweed beds can absorb and fix CO_2. With this as a background, the authors calculated CO_2 emissions from the processes of the production and transportation of materials and during construction from the production to placement of concrete blocks, with the objective of contributing to the establishment of a method of designing environment-friendly coastal structures. Longterm CO_2 fixation by seaweed beds formed after the placement of concrete blocks was estimated as well. These calculations revealed the relationship between the amount of CO_2 emitted from the construction process of a coastal structure and the quantity of CO_2 fixed by seaweed beds on the concrete blocks. The authors also proposed a new type of armor block to reduce the environmental loads of coastal structures.
2012-11-15