Author(s): Keiko Udo; Satoshi Takewaka; Hitoshi Nishimura
Linked Author(s):
Keywords: Morphology; Backshore; Dune; Aerial photograph; Remote sensing
Abstract: Aerial photograph and field surveys have been conducted to describe the morphological behavior of backshore dunes on three beaches facing the Kashima Sea, Japan. The results of aerial photograph survey show that man-made straight dune extending longshore split into small dunes with length of 100 m in average under the action of wind for 10 years. Once the artificial dune splits, sand is transported through the gap from backshore to inland region where coastal forest is planted, and new small dunes are formed in front of the coastal forest region. Sand volume of a small dune on one of the research area gradually decreased after the breakup. It remains unchanged, however, after a new small dune was formed. Bush hedges build in front of the seaside of the dunes stabilized the backshore topography. The area where coastal forest existed varied in accordance with the amount of penetrating sand from the backshore. It decreases remarkably when gaps are formed in the dune, and remains unchanged when small dunes are formed in front of the coastal forest region.
Year: 2001