Abstract
Trenches were excavated to observe the sedimentary strata on three beaches in Shizuoka, Japan. The western trench was near the Abe River, which is the source of sediment transport; the eastern trench was on the Miho Spit that marks the end of the longshore sediment transport, and the third was in between the two. The strata of the walls of the trenches were recorded and the grain-size distribution of each stratum analyzed. It was found that the grain-size accumulation curve could be divided into five groups based on the ratio of gravel to sand. This shows that conditions of sediment transport affect sediment content. Trench wall strata provide evidence of the strata-forming events.
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