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Tamil Research Institute RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR DEVELOPMENT OF COLACHEL PORT AT TAMILNADU FINAL REPORT 2.2. DESIGN WAVE HEIGHT For the breakwater design, the design conditions of 1 in 200 years have been considered. The transformation wave from deep water to shallow water have been propagated to several points of interest around breakwaters areas. Figure 1. Situation map (Points of interest) The result of this propagation is obtain a wave height which has been taken as the first step for the preliminary design. So mean regime and extreme regime have been estimated in each point. All values are shown in the next table: Shallow water Points Mean Regime Extreme Regime (200 years) P1 1,78 4.00 P2 2,08 5.00 P3 2,00 4.80 P4 2,02 4.50 P5 2,02 5.00 P6 2,06 4.80 P7 1,99 4.90 CP1832-FR-AX-04-CP-Breakwater-Design.Ed1.docx AX04 - 4 www.tamilri.com
Tamil Research Institute RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR DEVELOPMENT OF COLACHEL PORT AT TAMILNADU FINAL REPORT 3. RUBBLE-MOUND BREAKWATER 3.1. ARMOR LAYER It has been considered accropodes for the armour units and near de coastal line in shallow water cubic blocks have been considered for the armour units.(around the depth of -5m). Hudson formula have been used for calculating the weight of armour unit: Where: =Mass density of Armour units H=Design Wave Height K D =Stability Coefficient = =Mass density of Water cot α=Armour Slope (H/V) Hudson formula for randomly placed concrete armour units has been rewritten as presented in the next equation, it has been taken from CIRIA Using the significant wave height, Hs(m) and the nominal diameter of the unit, Dn (m). The values of the Stability Coefficient for Accropodes is K D =15 in the Trunk of the breakwater portion and for cubic blocks is K D =6 Van der Meer formulas have been also considered for the design of the armour layer , these formulas are especial for accropodes: (CIRIA) For the Rubble-mound breakwater design it has been taken three parts depending on the wave height: • First Section :It is the deepest part of the rubble-mound breakwater ( around the depth of -15 m to -11m ),the wave height has been taken from the point of interest (P3 and P2), Hs= 5 m CP1832-FR-AX-04-CP-Breakwater-Design.Ed1.docx AX04 - 5 www.tamilri.com
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