A total of 24 surface sediment samples collected from coastal region and fronting of sea cliff on Cape Cod in southeastern Massachusetts, were analyzed to investigate the sediment transport mechanism.
According to the result of grain-size analysis, the overall trend of grain size decreases from the north(Wood End Beach) to the south(Nauset Light Beach). The coarser materials tend to be deposited at the foreshore than at the backshore. Especially gravel content(%) is very high in northern beaches. The gravel fraction tended to concentrate at the toe of the beach. In addition to gravel, the beach and nearshore bar also tended to be deposite of very coarse sand and the finer fraction accumulate in the offshore bar.
Grain-size analyses of sediment indicates that the coarsest sands including gravel accumulate in the beach and nearshore bar, the finer fraction winnowed out by wave action to be deposited in the offshore bar. The beach and nearshore bar sands and gravel are subsequently transported laterally by the wave-driven longshore drift, and finally they come to rest in the distal end of Provincetown Hook. The finer offshore sands are trnasported laterally to the south by net southward-directed longshore current.

• 김동주(광주 · 전남발전연구원) | Dong-Ju Kim (Kwangju, Chonnam Development Institute)
• 은고요나(전남대학교 해양학과) | Go-Yeo-Na Eun (Dept. of Oceanography, Chonnam National University)