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Tidal Circulation in the Hooghly Estuary and Adjacent Coastal Oceans

  • S. K. Mishra
  • R. K. NayakEmail author
  • P. C. Mahanty
  • M. V. R. Seshasai
  • V. K. Dadhwal
Research Article
  • 73 Downloads

Abstract

A terrain-following ocean general circulation model is implemented for simulating tidal and residual circulation patterns in the Hooghly Estuary and its adjacent coastal oceans (HECO) on the east coast of India. The model is forced with time-varying tidal levels and momentum fluxes at the eastern and southern open boundaries, and winds at the air–sea interface. Simulated tidal levels and currents are compared well with the observations. Based on model solutions, spatial patterns of semi-diurnal and diurnal tides and circulation are described. The residual circulation shows prevalence of ocean-ward along channel flow from north to south with distinct differential circulation patterns on its right and left flanks of the outer estuary. A mesoscale eddy associated with residual circulation has been occurring in the southwestern flank of the HECO, adjacent to the Digha coast. This is associated with enriched chlorophyll_a concentration (Chla), causing the region as the suitable place for the fishing activity. The residual currents in the left of the channel (toward the Sunderban) in the southeastern flank of the HECO are eastward and diverging in nature and are associated with reduced Chla.

Keywords

Tide Residual circulation Coastal circulation Satellite altimeter East coast of India Hooghly Estuary Potential fishing zone 

Notes

Acknowledgements

This work is carried out as part of coastal ocean analysis system of national remote sensing technology development project. Our sincere thanks to director NRSC for his continuous encouragement and supports. We thank the director of INCOIS for his continuous support and advice. We acknowledge various data sources such as INCOIS for tide gauge information, MODIS for Chlorophyll observation, NHO and GEBCO for bathymetry data sets.

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Copyright information

© Indian Society of Remote Sensing 2019

Authors and Affiliations

  • S. K. Mishra
    • 1
  • R. K. Nayak
    • 1
    Email author
  • P. C. Mahanty
    • 2
  • M. V. R. Seshasai
    • 1
  • V. K. Dadhwal
    • 3
  1. 1.National Remote Sensing Center (NRSC)ISROBalanagar, HyderabadIndia
  2. 2.Indian National Centre for Ocean Information ServicesHyderabadIndia
  3. 3.Indian Institute of Space Science and TechnologyThiruvananthapuramIndia

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