Abstract
Notsukezaki Sand Spit is the longest sand spit in Japan and the wave and morphological characteristics vary along the spit. The main purpose of this study is to investigate the morphological changes of the sand spit for long-term and mid-term field observations and aerial photos. The natural and morphological characteristics are investigated based on the field observations and aerial photos for a long-term period (decades). The regional sediment budget is estimated using the shoreline changes and the result of wave hindcast simulation for five years. Finally, the cross-shore beach processes are examined using the numerical model, CSHORE.
Highlights
A sand spit is a deposition landform along coasts, caused mainly by dominant littoral drift and wave action
The main purpose of this study is to investigate the natural and morphological characteristics based on field observations and aerial photos for a long-term period
The long curved sand spit is exposed to different wave conditions along its entire length
Summary
A sand spit is a deposition landform along coasts, caused mainly by dominant littoral drift and wave action. There are few sand spits in Japan and the spits are eroding now. The main reasons are the influence of construction of coastal structures (i.e., ports) and the decrease of sand supply from rivers. Those erosion problems have become critical in Japan. There were several researchers studying the morphology of sand spits. Johnson (1919) reported the developing processes of Sandy Hook, NJ and King and McCullagh (1971) established a simulation model based on a Monte Carlo method in terms of different directional wave effects to predict the sand spit formation
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