FIELD OBSERVATION ON EFFECT OF MULTIPLE FENCES FOR PREVENTING WINDBLOWN SAND ON OISO-KITAHAMA COAST

Abstract

 On the Oiso-kitahama coast where westerly wind prevails in winter, field observation on the deposition around the multiple fences for preventing windblown sand were carried out in June and July, 2019. On this coast, 17 fences were built at an angle of 40° relative to the direction normal to the seawall with gradually increasing length of the fence. In each fence, sand mound with a maximum height of 0.85 m on upwind side of the fence has formed owing to the prevailing wind, and the cross-shore distribution of the mound was asymmetry and the elevation rapidly decreased because of the passage of wind through the opening between the fence and seawall. On the most downwind site, sand was deposited up to the top of the fence.