RESPONSES OF COASTAL TOPOGRAPHY TO SEA-LEVEL RISE

Nobuo Mimura, Eiichi Kawaguchi

Abstract


The impacts of sea-level rise induced by global warming on sandy beaches and sediment deposition around the river mouth are assessed. The exacerbated erosion by sea-level rise is evaluated in a national scale for Japan, on the basis of the Bruun Rule assuming the existence of the equilibrium beach profile. The eroded area reaches 56.6, 81.7, and 90.3% of the total area of the existing beaches for the sea-level rises of 30, 65, and 100cm, respectively. The effects on sandy beaches is extremely large, since such erosion superposes on the already existing erosion. The effect of sea-level rise on the river mouth is also examined by a numerical model. The place of sand deposition changes from the river mouth to the upper reaches along the river as the mean sea level rises higher. Higher risk of flooding is anticipated because of the rise of river floor and the backwater effect of sea-level rise.

Keywords


sea level rise; topography

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