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This paper presents some general properties on topographic change on the shore and sea bed in the vicinity of ports and harbours constructed on the sandy beach, mainly with the case study of Kashima Port. Following three characteristics of the topographic change due to prolongation of breakwaters are discussed; that is, i ) The shoaling and the change of topography in the area surrounded by breakwaters and shoreline, ii ) Topographic change of artificial beach in the updrift beach of breakwater having the long oblique part, iii. ) Erosion and accretion of downdrift beach due to the prolongation of the oblique part of breakwater.

TOPOGRAPHIC CHANGE RESULTING FROM CONSTRUCTION OF A HARBOR ON A SANDY BEACH: KASHIMA PORT