EXPERIMENTAL STUDY ON THE DESIGN OF SUBMERGED BREAKWATER AND END SECTION OF LARGE-SCALE SHORE PROTECTION FACILITIES

Abstract

  Large-scale submerged breakwater, jetties and nourishment has been constructed as shore protection facilities. The facilities of 1,630m long within the 2,540m overall length have been constructed. A belt-shaped scour is formed behind the submerged breakwater, and fill sand is flow out through the end section of the facilities. The remainder section 910m long will be constructed in the near future. The present study is, therefore, considering the adoption of the submerged breakwater of two rows and the plane configuration of end section of facilities to prevent or reduce the belt-shaped scour and outflow of fill sand at the remainder section. Three-dimensional hydraulic model test and two-dimensional numerical model test were carried out to decide the standard section and the configuration of the end section. As a result, it is confirmed that submerged breakwater of two rows is more effective than conventional submerged breakwater. And the plane configuration of the end section of the facilities is decided.