Vermelding onderdeel organisatie
February 1, 2012
1
Chapter 17: Review
ct5308 Breakwaters and Closure Dams
H.J. Verhagen
F...
February 1, 2012 2
advantages and disadvantages
rubble mound monolithic
• simple construction
• withstand unequal settleme...
February 1, 2012 3
Quarry stone or concrete ??
February 1, 2012 4
which design formula ???
 
3
33
cos sin
rN gH
W

  

 
3
3
cot
r
D
g H
W
K




0.2
0.18 0....
February 1, 2012 5
SLS and ULS
February 1, 2012 6
Closure dams: special conditions
• subdivision of the basin in order to reduce storage
area
• subdivisi...
February 1, 2012 7
two ways to reduce the area of a
basin
February 1, 2012 8
a basin with two entrances
February 1, 2012 9
an estuary with two channels
February 1, 2012 10
The gap is not (yet) in equilibrium
• stabilise the bottom of the
gap as soon as possible
• avoid eros...
February 1, 2012 11
closure dike breach Ouderkerk aan
den IJssel (1953)
February 1, 2012 12
closure alignments
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Ct530817

  1. 1. Vermelding onderdeel organisatie February 1, 2012 1 Chapter 17: Review ct5308 Breakwaters and Closure Dams H.J. Verhagen Faculty of Civil Engineering and Geosciences Section Hydraulic Engineering Emergency closure at Westkapelle 1944 (photo: National Geographic
  2. 2. February 1, 2012 2 advantages and disadvantages rubble mound monolithic • simple construction • withstand unequal settlement • large ratio between initial damage and collapse • many guidelines available • dependence on the availability of adequate quarry • large quantity of material required in deep water • large space required • difficult to use as quay wall • short construction time on location • can function as quay wall • economical use of material in deeper water • sensitivity to poor foundation conditions • uncertainty about wave loads in breaking waves • complete and sudden failure when overloaded • reflection against vertical wall • limited support for the designer from guidelines and literature
  3. 3. February 1, 2012 3 Quarry stone or concrete ??
  4. 4. February 1, 2012 4 which design formula ???   3 33 cos sin rN gH W        3 3 cot r D g H W K     0.2 0.18 0.5 50 0.2 0.13 50 6.2 (plunging breakers) 1.0 cot (surging breakers) sc n Psc n H S P d N H S P d N                   
  5. 5. February 1, 2012 5 SLS and ULS
  6. 6. February 1, 2012 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 entrances
  7. 7. February 1, 2012 7 two ways to reduce the area of a basin
  8. 8. February 1, 2012 8 a basin with two entrances
  9. 9. February 1, 2012 9 an estuary with two channels
  10. 10. February 1, 2012 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 area
  11. 11. February 1, 2012 11 closure dike breach Ouderkerk aan den IJssel (1953)
  12. 12. February 1, 2012 12 closure alignments
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