No abstract

Upright type port and harbor structures have been adopted to quay walls, breakwaters and other maritime structures. The organic matters of faeces and pseudofaeces loaded by suspended feeder inhabiting on the wall would fall onto seabed of adjacent area, resulting in consuming dissolved oxygen. Eutrophic inner bays usually experience a thermocline during summer season. Therefore, depositions of organic matters derived from attached animals would promote hypoxia in the hypolimnion. The design technique has been developed as one solution of this problem, which is based on the ecosystem engineering for creating the artificial shoal area inside of vertical structures. The objective of the technique is to activate material cycle by installation of artificial shoal through the food web from attached animals to benthic animals feeding organic matter excreted by attached animals. In the discussion, we proposed the idea for creating the artificial shoal space inside a caisson type upright breakwater developed for the Mishimakawanoe port in Ehime prefecture, located western part of Japan.

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The Okinawa General Bureau of Cabinet Office has been performed various environmental investigations to realize coexistence of coral reef and port construction. It should be necessary to utilize the data provided by the investigation effectively. However, there was not a unified guideline by the past investigation. There was the case that an investigation item or precisions were different on each investigation. There was also the grasp of the general comparison and evaluation of the investigated data. Therefore we planed to make unified guideline of investigation methods of coral reef at the port of Okinawa. "The guideline of investigation methods of coral reef at the ports in Okinawa" was published in March 2007.

No abstract