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Chapter 17: Reviewct5308 Breakwaters and Closure Dams                                               Emergency closure at W...
advantages and disadvantages  rubble mound           monolithic• simple construction                   • short constructio...
Quarry stone or concrete ??April 12, 2012                3
which design formula ???                       N ρr gH   3                                                        ρr g H 3...
SLS and ULSApril 12, 2012   5
Closure dams: special conditions• subdivision of the basin in order to reduce storage  area• subdivision because of two en...
two ways to reduce the area of abasinApril 12, 2012                     7
a basin with two entrancesApril 12, 2012               8
an estuary with two channelsApril 12, 2012                 9
The gap is not (yet) in equilibrium• stabilise the bottom of the  gap as soon as possible• avoid erosion of gullies in  th...
closure dike breach Ouderkerk aanden IJssel (1953)April 12, 2012                      11
closure alignmentsApril 12, 2012       12
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Breakwaters and closure dams 17

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Transcript of "Breakwaters and closure dams 17"

  1. 1. Chapter 17: Reviewct5308 Breakwaters and Closure Dams Emergency closure at WestkapelleH.J. Verhagen 1944 (photo: National GeographicApril 12, 2012 1Faculty of Civil Engineering and GeosciencesVermelding onderdeel organisatieSection Hydraulic Engineering
  2. 2. advantages and disadvantages rubble mound monolithic• simple construction • short construction time on location• withstand unequal settlement • can function as quay wall• large ratio between initial damage • economical use of material in deeper and collapse water• many guidelines available • sensitivity to poor foundation conditions• dependence on the availability of adequate quarry • uncertainty about wave loads in breaking waves• large quantity of material required in deep water • complete and sudden failure when overloaded• large space required • reflection against vertical wall• difficult to use as quay wall • limited support for the designer from guidelines and literature April 12, 2012 2
  3. 3. Quarry stone or concrete ??April 12, 2012 3
  4. 4. which design formula ??? N ρr gH 3 ρr g H 3 W≥ W ≥ Δ ( μ cosα + sin α ) Δ3 KD cot α 3 3 0.2 Hsc 0.18 ⎛ S ⎞ = 6.2 P ⎜ ⎟ ξ −0.5 (plunging breakers) Δ dn50 ⎝ N⎠ 0.2 Hsc −0.13 ⎛ S ⎞ = 1.0 P ⎜ ⎟ ξ P cot α (surging breakers) Δ dn50 ⎝ N⎠April 12, 2012 4
  5. 5. SLS and ULSApril 12, 2012 5
  6. 6. Closure dams: special conditions• subdivision of the basin in order to reduce storage area• subdivision because of two entrances• a closure with two or more entrancesApril 12, 2012 6
  7. 7. two ways to reduce the area of abasinApril 12, 2012 7
  8. 8. a basin with two entrancesApril 12, 2012 8
  9. 9. an estuary with two channelsApril 12, 2012 9
  10. 10. The gap is not (yet) in equilibrium• stabilise the bottom of the gap as soon as possible• avoid erosion of gullies in the storage areaApril 12, 2012 10
  11. 11. closure dike breach Ouderkerk aanden IJssel (1953)April 12, 2012 11
  12. 12. closure alignmentsApril 12, 2012 12
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