白良浜の海浜過程とその保全 (2)

Abstract

The objective of this paper is to verify the beach processes of Shirarahama by hydraulicmodel experiments and to clarify the applicability of the proposed beach erosion control workincluding beach nourishment. The experiments confirm that the nearshore currents off Yuzakiheadland carry out the beach sediment from the Shirarahama beach to the offshore region, and therefore gradual beach erosion continuously occurs under high waves. This processpartly depends on the geographical features of the northern part of Yuzaki headland whichslighly protrudes seaward. The proposed T-type groin at Yuzaki and the artificial headlandat Gongenzaki can control the waves and the currents inside the Kanayama bay and maintaina stable pocket beach after beach nourishment. With the headland defense control work, shorelines of two statically stable beaches intersect smoothly at the almost central part of thebeach and form a continuous one.