三里浜海岸における高須川の河口変動と河口周辺の汀線変化に関する研究
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概要
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The Takasu River fl ows out into Sanrihama Beach shore, where fl uctuation and closure of the river mouth are often witnessed. In this study, the locations of the river mouth and the shoreline around the river mouth were surveyed once every week, and the longshore sediment transport rate was calculated through the wave data (wave height, wave direction, and wave period) that were observed off the coast of Fukui Port. In addition, the relations between the river mouth fl uctuation and the longshoresediment transport rate and the shoreline change around the river mouth were examined. The results indicate seasonal features of the stretching of the drift length; it has become clear that drift length does not cause signifi cant stretching from June to October, and river mouth closure tends to occur from August to November; both the drift length and the total longshore ediment transport rate are at their maximum at the beginning of February, while it has declined from February to April. In the winter of2009 and 2012, the direction of the river mouth fl uctuation agreed with that of the longshore sediment transport. In the winter of 2010 and 2011, the river mouth fluctuation in the opposite direction. It wasconfi rmed that the direction of the river mouth fl uctuated does not necessarily agree with that of the longshore sediment transport. In addition, despite signifi cant changes with the seasons, the averageposition of each year does not change the position of the shoreline.
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