海岸線と海浜堆積物にみられる石狩湾新港の影響について

概要

論文の詳細を見る
Ishikari Coast is located on the Japan Sea side of Central Hokkaido, Japan. At present, "New Ishikari Bay Port" is under construction in the middle of the coast. As this port is constructed on a beach area, it may cause some environmental problems due to the change of littoral drift. The purpose of this study is to clarify the effects of the construction of New Ishikari Bay Port on shoreline and beach sediments. The results obtained by this study are summarized as follows : 1) In these several decades, the shoreline of this coast tends to accrete. 2) Although longshore sand transport along the beach has no definite direction, it has rathermuch southward component during the summer. It seems that major source of beach sands is Ishikari River. Measurements of grain size and shape of beach sediments indicate that they move alongshore over a very long time. 3) The shoreline adjacent to the jetties had been accreted year by year before 1978. During the period from May to November 1979, the eastside has been little changed, while the westside has been accreted rapidly. 4) Notable discontinuities of values in the grain size parameters of beach sands suggest the effects of the jetties on nearshore currents and littoral drift.
1982-03-25