Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
1. Introduction
The aim of this annexure is to check that the berths are well protected by the designed breakwaters. In
order to check it, the downtime for the two proposed berths is calculated through a numerical model
which evaluates the tranquillity for the proposed port.
The wave height inside the port which makes possible that the container vessels do not interrupt the
operation of loading/unloading must be limited. Different international codes have been considered as IS
4651-V: Code of Practice for Planning and Design of Ports and Harbors, PIANC guidelines and ROM 3.1-
99 (Spanish Recommendations for Maritime Work). The maximum operational wave height considered for
container vessels is 0.5m (forming an angle of +/- 45º over the fore and aft centerline of the vessel).
Due to the continuous raise of container traffic, the berth is expected to be expanded two or three years
after finalizing the construction of Phase 1. Therefore, it has been decided not to prolong the south
breakwater, beyond the berth line in order to make phase 2 and phase 3 expansions easier. Instead of
that, the length of the main breakwater must be designed with the appropriate length to avoid down
times.
The most important inputs parameters for the study of short wave agitation were:
• Bathymetry and dredging.
• Near shore wave data has been extracted from the offshore wave data using SWAN modeling
as described in Annexure 3.
• Port layouts, geometry of the port and the length of breakwater.
• Types of breakwaters, in order to know the reflection coefficient.
• Limit of wave heights for estimation of the downtime (non operation days).
2. METHODOLOGY
The methodology used is as follows:
• The Near shore wave climate has been analyzed in order to select the cases that have been
propagated into the inner port with the agitation model.
• Different meshes have been defined for the propagation. Depending on the peak period and
and wave direction .
• It has been selected two areas for the proposed berths, and it has been also estimated the
mean wave height in each area for each considered case.
• The downtime has been estimated for the proposed berths
3. NUMERICAL MODELS
The numerical model used has been SMC-MANOLO, it is an Advanced Model Application to Nonlinear
Harbor Oscillations
Inside SMC-MANOLO Numerical Model, it has been required the use of another Wave Spectral Model
(MSP). This model resolves the elliptic mild slope equation through the finite elements method. It is able
to include the effect of shoaling, refraction, energy dissipation (bottom friction and wave breaking),
diffraction, wave and resolve the water movement surface taking the boundary reflections.
CP1832-FR-AX-03-CP-Harbor_Short_Wave_Agitation-Ed1.docx AX03 - 2
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