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Beach Erosion in Japan and Its Classification

by Takaaki Uda, Public Works Res. Inst, Ibaraki, Japan,



Document Type: Proceeding Paper

Part of: Coastal Sediments

Abstract:

Beach erosion in Japan is investigated in a nationwide scale and the causes are classified into six categories. Of six categories the most important factors are 1) obstruction of continuous longshore sand transport by the structures, 2) beach erosion triggered by the formation of circulating nearshore currents in the lee side of the large-scale offshore breakwater, and 3) decrease of sediment supply from rivers. Twenty two coasts are classified into these categories. The fundamental problems related to the present measures against beach erosion are deeply discussed.

Subject Headings: Littoral drift | Erosion | Beaches | Sediment transport | Water supply systems | Transportation engineering | Sediment | Japan | Asia

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