Abstract
A method using granulated coal ash (GCA) is proposed for the restoration of sea bottom environment in Yong-Won Bay (Busan, Korea) based on numerical calculations of flow field, laboratory experiments, and analysis results of sediment properties. The results strongly supported that high turbidity water at the sea bottom in the central part of the bay intrudes into the western part of the bay. It is expected that organic matter is transported by the current of high turbidity water, leading to the aggravation of the sea bottom environment. Experiment results, however, suggest that this aggravation can be prevented by scattering GCA on the sea bottom at the entrance of the western part of the bay. This is because, 16.8 to 54.6% of the organic matter will be captured in the GCA layer due to 20% decreases of flow velocity after scattering GCA.
