Abstract
Results of field and aerial photograph surveys are described on the behavior of backshore dunes during the period from 1984 to 1999 at three coasts facing the Kashima Sea, Japan. Data obtained through the field survey shows that the change in backshore height has positive correlation with the ground covering ratio due to vegetation. The aerial photograph survey shows that continuous longshore dunes are split into small dunes roughly 100m in length during a period of around 10 years, and backshore sands are blown into land-side coastal forest through gaps between small dunes. As found from both the surveys, total sand volume around the dunes in the Tsuno-ore area gradually decreased until 1987. However, it remained unchanged since then, as the shoreline was stabilized.
