Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
1. INTRODUCTION
The goal of this work is define the wave climate in coastal areas at some particular locations near the area
of study.
The characterization of wave climate offshore and the propagation to shallow water areas are necessary
for the design of port structures (breakwaters, sills, etc.).
The most important objectives are seen below:
• Characterization of wave climate offshore is realized analyzing the reanalysis databases from 1950
to 2014
• A maximum dissimilarity selection algorithm (MDA) is applied in order to obtain a representative
subset of sea states in deep water areas, guaranteeing that all possible sea states are represented
and capturing even the extreme events.
• These sea states are propagated using a wave propagated model (SWAN) to shallow water areas.
• The time series of the propagated sea state parameters at a particular location are reconstructed
using a non-linear interpolation technique based on radial basis functions (RBFs).
• Characterization of wave climate in shallow water at a particular location.
2. DATA SOURCES
2.1. THE OFFSHORE WIND DATA (CFSR):
The Climate Forecast System (CFS) is a model representing the global interaction between the Earth's
oceans, land, and atmosphere developed by the US National Centers for Environmental Prediction (NCEP).
It is a global third generation reanalysis product. The CFSR is a high resolution, coupled atmosphereocean-land
surface-sea ice system designed to provide the best estimate of the state of these coupled
domains over the period from 1979 to 2010 (Saha et al., 2010). CFS uses the latest scientific approaches
for assimilating observations from many data sources: surface observations, upper air balloon
observations, aircraft observations, and satellite observations. The Climate Forecast System Reanalysis
(CFSR) is an effort to generate a uniform, continuous, and best-estimate record of the state of the oceanatmosphere
for use in climate monitoring and diagnostics. CFSR stands out by its high resolution and
advances in data assimilation techniques. Here, the near-surface winds from CFSR is freely provided.
Please, refer to the source of this dataset for details of the quality and validation processes.
2.2. THE GOW (GLOBAL OCEAN WAVES) DATABASE.
Wavewatch IIII (WWIII, Tolman, 2002) is a third generation wave model developed at NOAA-NCEP. WWIII
solves the spectral action density balance equation for wave number direction spectra. The implicit
assumption of this equation is that properties of the medium (water depth and current) as well as the
wave field itself vary in time and space scales that are much larger than the variation scales of a single
wave. The model can generally be applied to large spatial scales and outside the surf zone.
Parameterizations of physical processes include wave growth and decay due to the actions of wind,
nonlinear resonant interactions, dissipation (`whitecapping') and bottom friction. Wave interactions with
currents were not considered in this hindcast.
The wind fields used to force waves come from the global re-analysis NCEP/NCAR RI (Kalnay et al., 1996).
The bathymetry used in the wave reanalysis originates from the General Bathymetric Chart of the Oceans
CP1832-FR-AX-02-CP-WaveClimate-Ed1.docx AX02 - 2
www.tamilri.com