High-resolution coastal geomorphology studies of beach erosion

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Beach erosion is a long-standing serious issue in Japan and extensive lengths of coastlines have been protected with seawalls, detached breakwaters, artificial reefs and so forth. The extreme cases of such compartmentalization in the sediment dispersal system render sandy beaches totally isolated from otherwise available sources of sediment supply. The authors took up Ogata Beach on the coast of Joetsu as one such example and revealed the occurrence of significant seabed erosion in the areas that were situated offshore of the artificial reefs and had water depths larger than the so-called closure depth.