scholarly journals Changes in nearshore waves during the active sea/land breeze period off Vengurla, central west coast of India

2016 ◽  
Vol 34 (2) ◽  
pp. 215-226 ◽  
Author(s):  
M. M. Amrutha ◽  
V. Sanil Kumar ◽  
J. Singh
Keyword(s):  
Wave Height ◽  
Water Depth ◽  
West Coast ◽  
Unique Feature ◽  
Sea Breeze ◽  
Wave Transformation ◽  
Land Breeze ◽  
West Coast Of India ◽  
Nearshore Waves ◽  
Wind Sea

Abstract. A unique feature observed in the tropical and subtropical coastal area is the diurnal sea-breeze/land-breeze cycle. We examined the nearshore waves at 5 and 15 m water depth during the active sea/land breeze period (January–April) in the year 2015 based on the data measured using the waverider buoys moored in the eastern Arabian sea off Vengurla, central west coast of India. Temporal variability of diurnal wave response is examined. Numerical model Delft3D is used to study the nearshore wave transformation. The wave height increased due to the sea breeze and reached its peak at  ∼ 13:00 UTC at 15 m water depth, whereas the peak significant wave height is at 12:00 UTC at 5 m water depth. Due to the influence of the land/sea breeze system, the range of the peak wave period in 1 day varied up to 8 s. Reduction in the wave height of wind-sea is around 20 % and that of the swell is around 10 % from 15 to 5 m water depth.

Sea breeze-induced wind sea growth in the central west coast of India

2014 ◽  
Vol 84 ◽  
pp. 20-28 ◽  
Author(s):  
V.M. Aboobacker ◽  
M. Seemanth ◽  
S.V. Samiksha ◽  
K. Sudheesh ◽  
Jyoti Kerkar ◽  
...  
Keyword(s):  
West Coast ◽  
Sea Breeze ◽  
West Coast Of India ◽  
Wind Sea

scholarly journals Variations in nearshore waves along Karnataka, west coast of India

2012 ◽  
Vol 121 (2) ◽  
pp. 393-403 ◽  
Author(s):  
V SANIL KUMAR ◽  
GLEJIN JOHNSON ◽  
G UDHABA DORA ◽  
SAJIV PHILIP CHEMPALAYIL ◽  
JAI SINGH ◽  
...  
Keyword(s):  
West Coast ◽  
West Coast Of India ◽  
Nearshore Waves

scholarly journals Spectral Evolution of Nearshore Wave Energy during a Sea-Breeze Cycle

2014 ◽  
Vol 44 (12) ◽  
pp. 3195-3208 ◽  
Author(s):  
Jim Gunson ◽  
Graham Symonds
Keyword(s):  
Wave Energy ◽  
Sea Breeze ◽  
Land Breeze ◽  
Spectral Evolution ◽  
Frequency Wave ◽  
Wave Growth ◽  
Local Wave ◽  
Wind Sea ◽  
The One

Abstract From in situ measurements taken over several sea-breeze cycles off a beach in southwest (SW) Australia, the evolution of the one-dimensional spectrum of wave energy is observed to have a distinctive spectral shape. During the land-breeze phase of the cycle, lower rates of dissipation of wave energy are seen at high frequencies compared to midrange frequencies above the remnant wind-sea peak. A simulation of waves was performed using the Simulating Waves Nearshore (SWAN) model and produced the same spectral evolution, by generating longshore modes, as seen in the observations. The performance of whitecapping schemes available in SWAN was assessed, and the Alves–Banner scheme was found to best simulate the observed growth and decay of the wave spectra. During the onshore phase of the sea-breeze cycle, local wave growth is duration limited, and during the offshore land-breeze phase, wave growth is fetch limited. From an examination of the modeled two-dimensional spectra it is found that quadruplet interactions play a key role in spreading high-frequency wave energy in frequency and direction space.

scholarly journals Co-existence of wind seas and swells along the west coast of India during non-monsoon season

Ocean Science ◽  
2013 ◽  
Vol 9 (2) ◽  
pp. 281-292 ◽  
Author(s):  
R. Rashmi ◽  
V. M. Aboobacker ◽  
P. Vethamony ◽  
M. P. John
Keyword(s):  
West Coast ◽  
Monsoon Season ◽  
Empirical Relation ◽  
The West ◽  
West Coast Of India ◽  
Wave Parameters ◽  
Wind Sea ◽  
Calm Weather ◽  
Sea Wind ◽  
Almost All

Abstract. An attempt has been made to understand the co-existence of wind seas and swells along the west coast of India during non-monsoon season. Wave data were collected in different years during non-monsoon season (off Goa during May 2005, off Ratnagiri during January–February 2008 and off Dwarka during December 2007–January 2008), which is fairly a calm weather season along these regions. Diurnal variation in wave parameters is noticeable along the central west coast of India (off Goa and Ratnagiri), which is due to the interaction of multidirectional waves (both wind seas and swells) of varying magnitudes and frequencies. Swells are predominantly mature (91%) and old (88%) during late pre-monsoon and post-monsoon seasons, respectively. Sea Swell Energy Ratio quantifies wind sea, swell and mixed seas prevailing in these regions during non-monsoon season. Intermodal distance (ID) between the energy peaks is moderately separated during non-monsoon season, whereas, during the shamal events, energy peaks are very close to each other (ID ∼ 0). However, pure wind seas (ID ∼ 1) are weakly present and found to co-exist with the swells almost all the time during non-monsoon season. Wind sea growth has been found while the swell propagates opposite to the direction of the wind and wind sea. Wind seas have minimum angular spreads in multimodal state. Under low winds, the interaction between wind sea and swell dominates and thereby the multimodal state reduces to unimodal state. The fetch available for the evolution of the wind sea spectrum has been estimated, and it is found to be less than 150 km. For the fetch limited condition, a non-dimensional empirical relation has been derived relating the significant wind sea height in terms of wind speed and peak wind sea period, and this relation fits for the west coast of India.

scholarly journals Influence of winds on temporally varying short and long period gravity waves in the near shore regions of Eastern Arabian Sea

2012 ◽  
Vol 9 (5) ◽  
pp. 3021-3047
Author(s):  
J. Glejin ◽  
V. Sanil Kumar ◽  
T. N. Balakrishnan Nair ◽  
J. Singh
Keyword(s):  
West Coast ◽  
Sea Breeze ◽  
Monsoon Period ◽  
West Coast Of India ◽  
Intermediate Period ◽  
Long Period ◽  
Post Monsoon ◽  
South West ◽  
South West Monsoon ◽  
West Monsoon

Abstract. Wave data collected off Ratnagiri, west coast of India during 1 May 2010 to 30 April 2012 is used in the study. Seasonal and annual variation in wave data controlled by the local wind system such as sea breeze and land breeze, and remote wind generated long period waves observed along the west coast of India, is studied. Sea breeze plays an important role in determining the sea state during pre and post monsoon seasons and the maximum wave height is observed during peak hours of sea breeze at 15:00 UTC. Long period waves (peak period over 13 s) are observed mainly during the pre and the post monsoon season. Maximum peak period observed during the study is 22 s and is in the month of October. Long period waves observed during the south west monsoon period of 2011 are identified as swell propagated from the Southern Ocean with an estimated travelling time of 5–6 days. The swells reaching the Arabian Sea from the South Indian Ocean and Southern Ocean, due to storms during the pre and post monsoon periods will modify the near surface winds, due to the dominant wave induced wind regime. Energy spectrum of observed waves indicates onset and decline of strong south west monsoon winds. Convergence of energy-containing frequency bands corresponding to short period waves (Tp < 8 s) and long period waves (Tp > 13 s) to intermediate period waves (8 < Tp < 13 s) are observed at the end of the pre monsoon season; divergence is observed during the start of the post monsoon period from intermediate period waves to short period waves and long period waves. South west monsoon period is characterized by the energy corresponding to the frequency band of intermediate period waves along the west coast of India.

Wave Transformation and Attenuation Along the West Coast of India: Measurements and Numerical Simulations

2013 ◽  
Vol 55 (1) ◽  
pp. 1350001-1-1350001-21 ◽  
Author(s):  
V. M. Aboobacker ◽  
P. Vethamony ◽  
S. V. Samiksha ◽  
R. Rashmi ◽  
K. Jyoti
Keyword(s):  
Numerical Simulations ◽  
West Coast ◽  
Wave Transformation ◽  
The West ◽  
West Coast Of India

scholarly journals Inter-annual variations in wave spectral characteristics at a location off the central west coast of India

2015 ◽  
Vol 33 (2) ◽  
pp. 159-167 ◽  
Author(s):  
V. Sanil Kumar ◽  
M. Anjali Nair
Keyword(s):  
West Coast ◽  
Spectral Characteristics ◽  
Wave Spectrum ◽  
Spectral Energy ◽  
Monsoon Period ◽  
West Coast Of India ◽  
Annual Variations ◽  
The Indian Ocean ◽  
Wind Sea ◽  
Two Peaks

Abstract. The inter-annual variations in wave spectrum are examined based on the wave data measured at 9 m water depth off the central west coast of India from 2009 to 2012 using a wave rider buoy. The temporal variation of the spectral energy density over a calendar year indicates similar variation in all the four years studied. The inter-annual variations in wave spectrum are observed in all months with larger variations during January to February, May and October to November due to the changes in wind-sea. The seasonal average wave spectrum during the monsoon (June–September) is single-peaked and the swell component is high in 2011 compared to other years. The annual averaged wave spectrum had higher peak energy during 2011 due to the higher spectral energy present during the monsoon period. During the non-monsoon period, two peaks are predominantly observed in the wave spectra; with the average peak at 0.07 Hz corresponding to the swells from the Indian Ocean and another at 0.17 Hz due to the local wind field.

scholarly journals Spatial and temporal variations of wave energy in the nearshore waters of the central west coast of India

2016 ◽  
Vol 34 (12) ◽  
pp. 1197-1208 ◽  
Author(s):  
M. M. Amrutha ◽  
V. Sanil Kumar
Keyword(s):  
Summer Monsoon ◽  
Indian Summer Monsoon ◽  
Water Depth ◽  
Wave Energy ◽  
West Coast ◽  
Temporal Variations ◽  
Wave Power ◽  
Monsoon Period ◽  
West Coast Of India ◽  
Water Depths

Abstract. Assessment of wave power potential at different water depths and time is required for identifying a wave power plant location. This study examines the variation in wave power off the central west coast of India at water depths of 30, 9 and 5 m based on waverider buoy measured wave data. The study shows a significant reduction ( ∼  10 to 27 %) in wave power at 9 m water depth compared to 30 m and the wave power available at 5 m water depth is 20 to 23 % less than that at 9 m. At 9 m depth, the seasonal mean value of the wave power varied from 1.6 kW m−1 in the post-monsoon period (ONDJ) to 15.2 kW m−1 in the Indian summer monsoon (JJAS) period. During the Indian summer monsoon period, the variation of wave power in a day is up to 32 kW m−1. At 9 m water depth, the mean annual wave power is 6 kW m−1 and interannual variations up to 19.3 % are observed during 2009–2014. High wave energy ( >  20 kW m−1) at the study area is essentially from the directional sector 245–270° and also 75 % of the total annual wave energy is from this narrow directional sector, which is advantageous while aligning the wave energy converter.

scholarly journals Impact of sea breeze on wind-seas off Goa, west coast of India

2006 ◽  
Vol 115 (2) ◽  
pp. 229-234 ◽  
Author(s):  
S. Neetu ◽  
Satish Shetye ◽  
P. Chandramohan
Keyword(s):  
West Coast ◽  
Sea Breeze ◽  
West Coast Of India
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