![]() ![]() if cover layer and first underlayer are both stone 2/3.Underlayer Guidance: First Underlayer (directly under the armor units) minimum two stone thick (n = 2) (1) under layer unit weight = W/10 Underlayer thickness t = nk ∆ γa 10. Number of armor units per surface area P γ a Na = nk ∆ 1 − A 100 W 1/ 3 W 9. Armor thickness t = nk ∆ γa , n = number of layers (at least 2) 1/ 3 W 7. 19-33) Q (gH s Tm ) = a exp(− b R *m γ ) (Table VI-5-8) example: Owen model: 5. Relative Freeboard R *m = R Hs water angle sm 2π 4. Reduced Run-up R uR H S = (R u ,i % H S )γ surface γ berm γ shallow γ wave roughness 3. VI-5-17 for coefficients) for ξm ≤ 1.5 R u ,i % HS = Aξ m for 1.5 (D/B)1/C R u ,i % HS = D b. ![]() 3-19) based on surf zone parameter at the structure tan α ξm =, Hs Lm α ≡ breakwater face slope, Hs ≡ significant wave height at toe of structure Lm ≡ corresponding wave length at toe of structure a. Design elevation (peak crown elevation) = DHW + set-up + run-up + freeboard 2. For variable water depth, design in segments Set BW Dimensions (controlled by height & slope) 1. (Breaking occurs in water in front of structure) 3. The depth limited breaking wave should be calculated and compared with the unbroken storm wave height, and the lesser of the two chosen as the design wave. Usually H1/3, but may be H1/10 to reduce repair costs (Pacific NW) (USACE recommends H1/10) 2. Adjust parameters and repeat as necessary Design Wave 1. Analyze foundation settlement, bearing capacity and stability 6. Develop toe structure and filter or bedding layer 5. Determine armor unit size/ type and underlayer requirements 4. Set breakwater dimensions Æ h, hc, R, ht, B, α, αb 3. Specify Design Condition Æ design wave (H1/3, Hmax, To, Lo, depth, water elevation, overtopping, breaking, purpose of structure, etc.) 2. 08a Summary of Rubble Mound Breakwater Design Equations B crown/cap ocean side bay/harbor side crest armor layer, W R DHW SWL hc first underlayer α hb αb h second underlayer t toe core/base Bt bedding and/or filter Design Concept/ Procedure 1.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |