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Tamil Research Institute RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR DEVELOPMENT OF COLACHEL PORT AT TAMILNADU FINAL REPORT Even for heavy sea conditions a vertical breakwater with floating concrete caissons can be used. For example, large caissons (52 x 32 x 34 m) have been designed and constructed in Gijon Port (Spain) for expected waves of 9.50 m of significant height and 19 seconds of peak period. The following image shows the construction works of Gijon Port expansion, undertaken between 2005 and 2010. Figure 123: Construction works of rubble mound and vertical breakwaters in Gijon Port (Spain) This kind of breakwaters is calculated considering the wave forces, in compliance with all safety coefficients that are explained in several international codes (Spanish ROM 0.5-05 code has been used for preliminary design). Different heights of crest have been considered depending on the possibility of overtopping. No overtopping is allowed for vertical sections which in Phase 2 and phase 3 will be filled in the port side. However, a small overtopping is allowed for the rest of vertical sections which will have only water in the port side. 9.2.3.1. Wave Pressure Formulas The pressures which hit the vertical breakwater due to the dynamic wave action are obtained using Takahashi and Goda formulas. These pressures are shown in the pressures diagram below. These are the forces -together with the uplift pressures and the own weight of the structure- which determine the geometry of the vertical breakwater. The geometry of vertical breakwaters has to meet the safety coefficients as sliding safety coefficient (SSC) and roll-over safety coefficient (RSC). CP1832-FR-CP-FinalReportRevised-Report-Ed1.docx 134 www.tamilri.com
Tamil Research Institute RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR DEVELOPMENT OF COLACHEL PORT AT TAMILNADU FINAL REPORT 9.2.3.2. Vertical Breakwater Section Figure 124: Pressure diagram. The following figures show the vertical breakwater preliminary design: Figure 125: No overtopping vertical breakwater section CP1832-FR-CP-FinalReportRevised-Report-Ed1.docx 135 www.tamilri.com
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