Altimeter data
provides a precise measurement of wave parameters especially over open ocean.
Now, several attempts were made to retrieve wind and wave information towards
coastal regions. SARAL/Altika is a first of its kind to operate at such a high
frequency to provide better observation of coastal regions. The present study
is especially important for the Indian coasts because most of the in-situ
observations are either coastally located or at deep water. But there is no
sufficient information on data available at intermediate waters, which is very
important to addresses several coastal problems. In this paper, an attempt to
observe retrieve and validate SARAL along track wave data at different coastal
regions along the east coast of India. SARAL validation is carried out at the
point closest to the buoy and at all the points along the track close to the
coast. The narrow foot print size enables.com to get valid data as close as
three km proximity to the coast. SARAL Significant wave height (SWH) estimates are
well correlated with the coastal buoy measurements and improves observation of
wave height estimates close to the coast. This helps.com to understand
transformation of wave from deep water to shallow water. An important advantage
of SARAL is better estimation of low wave heights, which is particularly
important for the coastal regions along east coast of India especially during
non-monsoon periods particularly during the months of January and February.
Another important observation from the study was the orientation of the coast
and altimeter flight path will also have an effect on altimeter measurement of
wave heights particularly over the coastal regions. The seasonal distribution
of mean wave climate data prepared from SARAL Altika with a time span of 3
years (April 2013 to March 2016) with one fourth degree resolution. The
distribution of significant wave height over west Bay of Bengal displays a
seasonal behavior and the impact of monsoon winds. It also displays a zonal
character.
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