Rubble Mound Breakwater Design Equations - ESSIE

Rubble Mound Breakwater Design Example Given: Design Conditions Water depth: m Beach slope: 1:20 Design high water: m Design wave Hs = 2 m H1/10 = m Tm = 8 sec Lo = 100 m Allowable overtopping: m3/sec/m Armor unit: rough quarry stone Soil data: 0 m m SM (sand) fine to medium loose = 17 kN/m3 = 30 c = 0 m CH (clay) soft over-consolidated = 14 kN/m3 = 0 c = 50 kPa eo = k = 10-5 cm/s av = 3x10-3 m2/kN Cc = limestone B crown/cap ocean side bay/harbor side crest armor layer, W hc R first underlayer DHW SWL hb b h second underlayer t toe core/basebedding and/or filter Bt Assume: Armor and underlayer material is quarry stone: a = t/m3 Structure slope: 1:2 Structure will be symmetric (this may be changed to reduce structure size in necessary) Specify Design Condition: SWL = m, DHW = m h = + = m h = m Assume listed conditions are at structure toe. Hs = H1/3 = 2 m T = 8 sec Lo = 100 m = hL2tanhL2gT22 at h = Lm = 62 m Calculate depth limited breaking wave height at structure site, compare with the unbroken storm wave height, and use the lesser of the two as the Design wave Hb/hb ~ at DHW: Hb = = m at SWL: Hb = = m Alternate methods in CEM II-4 Both wave heights in (1) are greater than Hs waves are not breaking and Design H = Hs = 2 m H = 2 m Set BW Dimensions (co)

Under-layer Design: The goal to reduce the size of the stone to at point where W/wcore ≤ 15-25, where W is the stone in the layer covering the core. Roughly, this gives a size of ~W/4000 for the core

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  Design, Mound, Breakwaters, Rubble, Rubble mound breakwater design

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