CROSS SECTIONAL DETAILS OF BREAKWATER 78 x 4.8m (Mean water + Tidal correction) Maximum wave height.0m + 0.8 = 3. Hs = H max 1.6 2.34m .DESIGN OF BREAKWATER Available data: Design Water depth = 4.6 = = 3.744m Significant wave height Hs for the calculation of Armour weight. Hmax = 0.74 1 . 65t/m3 Unit weight of sea water 1. Of individual armour unit in ton. W H KD θ Kr the Wr Ww = = = = = = = Wt.025t/m3 . Design wave height in meters Stability co-efficient = 2 Angle of structure slop measured with horizontal Specific gravity of armour unit relative to water at the structure Unit weight of armour in 2. According to Hudson. 2 layers. no overtopping. Wr H 3 W = k D ( s r 1) 3 cot Where.DESIGN OF ARMOUR LAYER Assuming armour unit is rough quarry stone. 5 2650 x 2.0T.84T Provide boulder stone of 3. Nominal diameter (D) of stones corresponding to the Armour ruble stone weight D = W W r 1 3 3000 = 2650 1 3 = 1.5 = 2.DESIGN OF ARMOUR LAYER Sr = Wr Ww =2.585 1)3 x1.585 Cot θ = W = 1.343 2(2.04 . 15 x 1.392m Adopt 2.5m thick armour layer .04 = 2.15 T = 2 x 1.ARMOUR THICKNESS The thickness of the armour layer(T) can be calculated as T = nKdD Kd = Layer coefficient = 1. .CREST WIDTH The crest width depends on the maximum of the following Minimum number of stones required Width depends on the degree of over topping The functional aspect during the construction and after use which may be equal to the width of the wheel. 0m .15 2650 1 3 B = = 2.CREST WIDTH B Where B N Kd W Wr = W nK d W r 1 3 = = = = = Crest width in m number of quarry stone (n=2) Layer co-efficient Mass of Armour unit.392m Provide a crest width of 4. Mass density of Armour unit Kg/m3 3000 2 x1. . The size of stone in core would be w/100. BEDDING LAYER Bedding layer act as foundation to support the entire structure. Provide stones of weight 50kg to 125kg. however for the practical limitations as well as to serve the purpose of the core and to avoid silt passing a wider range is suggested.CORE LAYER The core layer supports the protective armour cover and any other under layer. It prevents sediments passing thought the breakwater. The stones of 1Kg to 50Kg can be provided as bedding layer to a thickness of 150mm. .8) = 5.92m Note: A toe mound is to be placed on side of the break water for preventing the sliding of the stones and protecting the slope failure.4x(water depth) 2x(wave height) 0. A toe mound of 5.34) = 0.0m 2.5m 4.4(4.68m 1.TOE MOUND (GABBION BOX) Toe mound width should be maximum of 2x(WaveHeight) or 0.5m height is provided.4x(water depth) Width of toe mound Height of toe mound = = = = 2(2.0m top width and 2. Toe mound is provided with stones of size 150mm. BREAKWATER CROSS SECTION . . DESIGN OF SEAWALL Available data: Design Water depth = 2.56 1 . Hs = 1.6 = = 1.975m .56m Significant wave height Hs for the calculation of Armour H max weight.0m (Considering the tsunami runup of 1.0 = 1.6 0. Hmax = 0.78 x 2.8m above MSL as per the data given by Tuticorin Port) Maximum wave height. W Where.025t/m3 .DESIGN OF ARMOUR LAYER Assuming armour unit is rough quarry stone. Design wave height in meters Stability co-efficient = 2 Angle of structure slop measured with horizontal Specific gravity of armour unit relative to water at the structure Unit weight of armour in 2. According to Hudson. no overtopping.65t/m3 Unit weight of sea water 1. W H KD θ Kr the Wr Ww = Wr H 3 k D ( s r 1) 3 cot = = = = = = = Wt. Of individual armour unit in Newton. 2 layers. DESIGN OF ARMOUR LAYER Sr Cot θ W = = = Wr Ww 4 =2. Nominal diameter (D) of stones corresponding to the Armour ruble stone weight D = W W r 1 3 = 206.585 1)3 x 4 = 0.08T Provide 400kg to 500kg weight armour in two layers considering tsunami effect.5 2650 1 3 = 0.9753 2(2.426 .585 2650 x0. 15 x 0.15 T = 2 x 1.98m Adopt 1.ARMOUR THICKNESS The thickness of the armour layer(T) can be calculated as T = nKdD Kd = Layer coefficient = 1.426 = 0.25m thick armour layer . CREST WIDTH The crest width depends on the maximum of the following Minimum number of stones required Width depends on the degree of over topping The functional aspect during the construction and after use which may be equal to the width of the wheel. . 5m .98m Provide a crest width of 1.CREST WIDTH B Where B N Kd W Wr B = W nK d W r 1 3 = = = = = = Crest width in m number of quarry stone (n=2) Layer co-efficient Mass of Armour unit.15 2650 1 3 = 0.5 2 x1. Mass density of Armour unit Kg/m3 206. The size of stone in core would be w/100. .CORE LAYER The core layer supports the protective armour cover and any other under layer. BEDDING LAYER Bedding layer act as foundation to support the entire structure. Provide stones of weight 50kg to 125kg. It prevents sediments passing thought the breakwater. however for the practical limitations as well as to serve the purpose of the core and to avoid silt passing a wider range is suggested. The stones of 1Kg to 50Kg can be provided as bedding layer to a thickness of 150mm. Toe mound is provided with stones of size 150mm.TOE MOUND (GABBION BOX) Toe mound width should be maximum of 2x(Wave Height) or 0.0)= 2.5m 1.5m height is provided.5m top width and 1.4(2.4x(water depth) 2x(Height of breakwater) 0.4x(water depth) Width of toe mound Height of toe mound= = = = 1.95m 0. .975) = 0.8m Note: A toe mound is to be placed on side of the break water for preventing the sliding of the stones and protecting the slope failure. A toe mound of 2.5m 2(0. SEAWALL CROSS SECTION .