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Tamil Research Institute RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR DEVELOPMENT OF COLACHEL PORT AT TAMILNADU FINAL REPORT 4. VERTICAL BREAKWATER The design of the vertical breakwater have been calculated considering the strengths of wave, in compliance with all safety coefficients that are explained in the ROM 0.5-05 code. Different heights of crest have been considered depending on the possibility of the overtopping. The vertical sections which in Phase 2 and phase 3 will have container layer in the port side, any overtopped could be possible. However the rest of the vertical sections which will have water in the side port , a small overtopped could be allow. 4.1. WAVE PRESSURE FORMULAS The pressures which hit the vertical breakwater due to the dynamic wave action has been obtained using Takahashi formulas 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. For the final result the geometry of the vertical breakwater has to satisfy with safety coefficients as sliding safety coefficient (S.S.C.) and roll-over safety coefficient (R.S.C.) 4.1.1. TAKAHASHI FORMULAS Ab h d 11 0.93 0.12 0.36 0.6 L h Ab h d 22 0.36 0.12 0.93 0.6 L h 2011 11 0 1 1511 11 0 4.9 22 22 0 2 3.0 22 22 0 I I1 I0 cosh 2 si 2 0 cosh 1 I1 1 si 2 0 cosh 1 cosh 2 HD si HD 2 ht I0 d 2.0 si Hd 2 h t 2Goda I I I0I1 * 2 max , Takahashi pressure: * 0.75 P 0.50 1 1 cos 1 H D * 2 1 cos 2 cos 1 1 2 H w D P1 P2 2h cosh L P P 3 P 0.50 1 cos u 1 1 3 1 2 3 H 3 1 3 w D CP1832-FR-AX-04-CP-Breakwater-Design.Ed1.docx AX04 - 12 www.tamilri.com
Tamil Research Institute RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR DEVELOPMENT OF COLACHEL PORT AT TAMILNADU FINAL REPORT 4.1.2. GODA FORMULAS 4h 1 1 0.6 L 2 4h senh L 2 2 h b d H mín 3hb d 2 D 2 2 d , H d h´ 1 3 1 1 h 2h coh L * 0.751 cos H D cos( ) cos ( ) 1 2 D P 0.50 1 2 H w 1 hc P4 P1 1 si; * hc * P4 0 si, * hc h * c min *;hc P1 P2 2h cosh L P 3 3P1 4.2. SAFETY COEFFICIENTS THE METHODOLOGY OF THE ROM 0.5-05 have been followed in order to calculate the sliding safety coefficient (S.S.C.) and roll-over safety coefficient (R.S.C.) SSC C RSC C sd sv V H M E M V CP1832-FR-AX-04-CP-Breakwater-Design.Ed1.docx AX04 - 13 www.tamilri.com
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Enayam Port

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