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Preventive method of beach erosion and accretion triggered by the formation of wave shadow zone associated with extension of port breakwater is investigated through the field observation, taking the Shimohara fishing port in Tateyama City in Chiba Prefecture as the example. This phenomenon is well-known in coastal engineering, but in Japan this kind of beach erosion and accretion have been repeatedly reported. In order to solve this problem, not only the research in engineering method, but also improvement of the environmental assessment system are required so as to include the prediction of topographic changes in the items of environment assessment.

PREVENTIVE METHOD OF BEACH EROSION AND ACCRETION TRIGGERED BY FORMATION OF WAVE SHADOW ZONE ASSOCIATED WITH EXTENSION OF PORT BREAKWATER