Ct530817
-
Upload
tu-delft-opencourseware -
Category
Business
-
view
284 -
download
0
Transcript of Ct530817
![Page 1: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/1.jpg)
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
![Page 2: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/2.jpg)
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
![Page 3: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/3.jpg)
February 1, 2012 3
Quarry stone or concrete ??
![Page 4: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/4.jpg)
February 1, 2012 4
which design formula ???
3
33 cos sin
rN gHW
3
3 cot
r
D
g HW
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 SP
d N
H SP
d N
![Page 5: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/5.jpg)
February 1, 2012 5
SLS and ULS
![Page 6: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/6.jpg)
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
![Page 7: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/7.jpg)
February 1, 2012 7
two ways to reduce the area of a basin
![Page 8: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/8.jpg)
February 1, 2012 8
a basin with two entrances
![Page 9: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/9.jpg)
February 1, 2012 9
an estuary with two channels
![Page 10: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/10.jpg)
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
![Page 11: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/11.jpg)
February 1, 2012 11
closure dike breach Ouderkerk aan den IJssel (1953)
![Page 12: Ct530817](https://reader034.fdocuments.net/reader034/viewer/2022052412/5583a406d8b42a1f098b545e/html5/thumbnails/12.jpg)
February 1, 2012 12
closure alignments