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Artificial reefs have been constructed for protecting coast from erosion and for replacing detached breakwaters. The construction causes topographical change around them. Bottom flow and water surface variation and others caused topographical change. So the experiment using 3-ADV (Acoustic Doppler Velocity Meter) to measure the bottom velocity profile around opening was carried out. And the topographical change by movable bed was investigated.This study shows the result of the distribution of bottom velocity around opening. The result shows that the mean velocity of flow at offshore side of reef was different from that at shore side reef. The former region has cyclic current field. And the change of topographical flux was nearly equals to the calculation results that using the Brown's theory and incident wave conditions.

STUDY IN BOTTOM VELOCITY DISTRIBUTION AROUND OPENING OF IMPERMEABLE ARTIFICAL REEFS