PLANE DESIGN OF "SPAC"; COUNTERMEASURE AGAINST SEABED SCOUR DUE TO SUBMERGED DISCHARGE AND LARGE WAVES

Takao Shimizu, Masaaki Ikeno, Hisayoshi Ujiie, Kazuaki Yamauchi

Abstract


Discussion is carried out on stability of submerged outlet structures of thermal power plants sited on sandy ocean beaches. The authors conceived the new scouring protection "SPAC" constructed by riprapping of the seabed just in front of the outlet. In this study, the authors investigated the plane design of the SPAC by means of 1/25 scale physical model. First of all, properties of seabed scour due to submerged discharge and monochromatic or multi-directional waves were examined. Secondly, the spreading process of the SPAC was investigated , and the necessary width of the SPAC was evaluated based on width of discharged current, and on the drift of discharged current effected by longshore current due to oblique incidence of waves. Finally, the physical model was verified by comparison with field data.

Keywords


large wave; plane design; SPAC; scour

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