Protected Shoreline Changes
The hook-shaped sand spit at Notsukezaki is the longest spit in Japan. Beach erosion became severe in the 1960s after the construction of the Shibetsu Port updrift of the sand spit.
The decadal shoreline change is predicted using a one-line model including all sediment sources and sinks. This one-line model is being used to quantify the effect of sea level rise.
A storm of 2014 caused appreciable beach erosion, down-drift of a groin constructed in 2013. The cross-shore numerical model CSHORE is being compared with this storm data and will be used to assess breaching risk for future severe storms.