RESTORATION TECHNIQUE FOR ECOSYSTEM OF PORT AND HARBOR

A PROOF EXPERIMENT AT KOMATSUSHIMA PORT IN TOKUSHIMA PREFECTURE

Abstract

An experimental structure was established at Komatsushima port in Tokushima Prefecture to study the environmental problems of vertical structure in port and harbor. Organisms inhabiting intertidal and subtidal zones of the structure are expected to play an role to reduce the amount of organic matter accumulated onto the sea bottom. The results suggested that concentration of organic matter in the deposited seston decreased at the bottom in front of the experimental structure. Accumulation of organic matter on the bottom, however, differed between the types A and B with different depths of flat bottom substrate, indicating that a flat bottom substrate shallower than DL-2m should be designed.