Wave hindcast studies using SWAN nested in WAVEWATCH III - comparison with measured nearshore buoy data off Karwar, eastern Arabian Sea

Waves in the nearshore waters (~15 m water-depth) of eastern Arabian Sea were simulated using SWAN nested in WAVEWATCH III (WW3) for the year 2014. The sensitivity of the numerical wave model WW3 towards different source term (ST) packages was tested. The performance of WW3 was evaluated with the measured deep water buoy data at 15.0000° N, 69.0000° E. Overall, the WW3 wave hindcast results using ST4 physics in deep water show a reasonable match (r=0.97 and SI=0.16) with the measured significant wave height (Hs). In deep water, a large overestimation (~23.7%) of mean wave period was observed using ST2 compared to ~8.2% using ST4. Komen et al. (1984) whitecapping formulation was found suitable based on the sensitivity studies of SWAN. Simulated Hs using nested SWAN model shows good correlation (r=0.96) with the nearshore measured data. During high sea state (Hs>2 m), an overestimation (~19.8% for ST2 and ~21.4% for ST4) and during low sea state (Hs<1 m), an underestimation (~16.1% for ST2 and ~31.5% for ST4) in mean wave period was observed in the nearshore. WW3 model forced by modified wind field (speed increased by 5%) during June and July resulted in a reduction in underestimation of Hs from 8.6% to 2.2%.

[1]  Debasis Sengupta,et al.  First results from a new observational system over the Indian seas , 2000 .

[2]  R. S. Kankara,et al.  Characteristics of shallow water waves off the central west coast of India before, during and after the onset of the Indian summer monsoon , 2015 .

[3]  The Propagation of Wind Errors Through Ocean Wave Hindcasts , 1996 .

[4]  Judith Wolf,et al.  Coupled wave and surge modelling for the eastern Irish Sea and implications for model wind-stress , 2009 .

[5]  P. R. Shanas,et al.  Shallow water wave spectral characteristics along the eastern Arabian Sea , 2013, Natural Hazards.

[6]  Amir Etemad-Shahidi,et al.  Wave modeling and extreme value analysis off the northern coast of the Persian Gulf , 2010 .

[7]  Ship-Mounted Real-Time Surface Observational System on board Indian Vessels for Validation and Refinement of Model Forcing Fields* , 2013 .

[8]  Y. Eldeberky,et al.  Nonlinear transformation of wave spectra in the nearshore , 1996 .

[9]  T. Nair,et al.  Influence of winds on temporally varying short and long period gravity waves in the near shore regions of the eastern Arabian Sea , 2012 .

[10]  Luigi Cavaleri,et al.  Wave Modelling - The State of the Art , 2007 .

[11]  Changes in nearshore waves during the active sea/land breeze period off Vengurla, central west coast of India , 2016 .

[12]  V. Sanil Kumar,et al.  Temporal variations in the wind and wave climate at a location in the eastern Arabian Sea based on ERA-Interim reanalysis data , 2013 .

[13]  R. Harikumar,et al.  Performance of the Ocean State Forecast system at Indian National Centre for Ocean Information Services , 2013 .

[14]  William M. Putman,et al.  Interannual Variability of Synthesized FSU and NCEP-NCAR Reanalysis Pseudostress Products over the Pacific Ocean , 2000 .

[15]  S. Mandal,et al.  Multipeakedness and groupiness of shallow water waves along Indian coast , 2003 .

[16]  Hendrik L. Tolman,et al.  A mosaic approach to wind wave modeling , 2008 .

[17]  Sea state observation in island-sheltered nearshore zone based on in situ intermediate-water wave measurements and NCEP/CFSR wind data , 2015, Ocean Dynamics.

[18]  S. Dickinson,et al.  NSCAT tropical wind stress maps: Implications for improving ocean modeling , 1999 .

[19]  N. Booij,et al.  A third‐generation wave model for coastal regions: 2. Verification , 1999 .

[20]  S. Shetye,et al.  Impact of sea breeze on wind-seas off Goa, west coast of India , 2006 .

[21]  T. R. Anoop,et al.  Indian Ocean Dipole modulated wave climate of eastern Arabian Sea , 2015 .

[22]  J. Shukla.  Effect of Arabian Sea-Surface Temperature Anomaly on Indian Summer Monsoon: A Numerical Experiment with the GFDL Model , 1975 .

[23]  Subrata K. Chakrabarti,et al.  Handbook of Offshore Engineering , 2005 .

[24]  H. Tolman.  The numerical model WAVEWATCH , 1989 .

[25]  P. G. Remya,et al.  Wave hindcast experiments in the Indian Ocean using MIKE 21 SW model , 2012, Journal of Earth System Science.

[26]  V. Polnikov,et al.  Verification of model wave heights with long-term moored buoy data: Application to wave field over the Indian Ocean , 2015 .

[27]  Prasad K. Bhaskaran,et al.  Wave forecasting system for operational use and its validation at coastal Puducherry, east coast of India , 2014 .

[28]  T. Smith,et al.  Ocean Model Response to Temperature Data Assimilation and Varying Surface Wind Stress: Intercomparisons and Implications for Climate Forecast , 1995 .

[29]  Alec Torres-Freyermuth,et al.  Wave Climate and Trends for the Gulf of Mexico: A 30-Yr Wave Hindcast , 2014 .

[30]  K. Hasselmann,et al.  On the Existence of a Fully Developed Wind-Sea Spectrum , 1984 .

[31]  C. Amante,et al.  ETOPO1 arc-minute global relief model : procedures, data sources and analysis , 2009 .

[32]  T. R. Anoop,et al.  Surface Wave Climatology and Its Variability in the North Indian Ocean Based on ERA-Interim Reanalysis* , 2015 .

[33]  R. Stull.  An Introduction to Boundary Layer Meteorology , 1988 .

[34]  M. Mcphaden,et al.  TropFlux: air-sea fluxes for the global tropical oceans—description and evaluation , 2012, Climate Dynamics.

[35]  R. Venkatesan,et al.  Modulation of local wind-waves at Kalpakkam from remote forcing effects of Southern Ocean swells , 2013 .

[36]  J. Thepaut,et al.  The ERA‐Interim reanalysis: configuration and performance of the data assimilation system , 2011 .

[37]  N. Booij,et al.  A third-generation wave model for coastal regions-1 , 1999 .

[38]  Amir Etemad-Shahidi,et al.  Wave data assimilation using a hybrid approach in the Persian Gulf , 2012, Ocean Dynamics.

[39]  T. Barnett,et al.  Measurements of wind-wave growth and swell decay during the Joint North Sea Wave Project (JONSWAP) , 1973 .

[40]  P. Vethamony,et al.  Wave Transformation and Attenuation Along the West Coast of India: Measurements and Numerical Simulations , 2013 .

[41]  V. Sanil Kumar,et al.  Variations in nearshore waves along Karnataka, west coast of India , 2012, Journal of Earth System Science.

[42]  R. Tomlinson,et al.  Comparison of two wave models for Gold Coast, Australia , 2007 .

[43]  Hendrik L. Tolman,et al.  A Third-Generation Model for Wind Waves on Slowly Varying, Unsteady, and Inhomogeneous Depths and Currents , 1991 .

[44]  B. Goswami,et al.  The Annual Cycle, Intraseasonal Oscillations, and Roadblock to Seasonal Predictability of the Asian Summer Monsoon , 2006 .