Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
4. VERTICAL BREAKWATER
The design of the vertical breakwater have been calculated considering the strengths of wave, in
compliance with all safety coefficients that are explained in the ROM 0.5-05 code.
Different heights of crest have been considered depending on the possibility of the overtopping. The
vertical sections which in Phase 2 and phase 3 will have container layer in the port side, any overtopped
could be possible.
However the rest of the vertical sections which will have water in the side port , a small overtopped could
be allow.
4.1. WAVE PRESSURE FORMULAS
The pressures which hit the vertical breakwater due to the dynamic wave action has been obtained using
Takahashi formulas and Goda formulas. These pressures are shown in the pressures diagram below.
These are the forces together with the uplift pressures and the own weight of the structure which
determine the geometry of the vertical breakwater. For the final result the geometry of the vertical
breakwater has to satisfy with safety coefficients as sliding safety coefficient (S.S.C.) and roll-over safety
coefficient (R.S.C.)
4.1.1. TAKAHASHI FORMULAS
Ab
h d
11
0.93
0.12 0.36
0.6
L h
Ab
h d
22
0.36
0.12 0.93
0.6
L h
2011
11
0
1
1511
11
0
4.9
22
22
0
2
3.0
22
22
0
I
I1
I0
cosh
2
si 2
0
cosh
1
I1
1
si 2
0
cosh 1 cosh 2
HD
si HD
2 ht
I0
d
2.0
si Hd
2 h
t
2Goda I I
I0I1
*
2 max ,
Takahashi pressure:
*
0.75
P 0.50
1
1
cos
1
H
D
* 2
1
cos
2 cos
1
1
2
H
w
D
P1
P2
2h
cosh
L
P P
3
P 0.50
1
cos
u
1
1
3 1
2
3
H
3 1 3 w D
CP1832-FR-AX-04-CP-Breakwater-Design.Ed1.docx AX04 - 12
www.tamilri.com