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Modelling of Plankton and Forage Fish Variability in the Gulf of Kachchh Using 2D Coupled Physico-Biological Model


Affiliations
1 Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016, India
2 Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India
 

A biophysical coupled model, which includes interaction of processes at different spatial and temporal scales, is used to assess the seasonal variability of plankton and forage fish. A five-compartment nutrient, phytoplankton, zooplankton, detritus, forage(NPZDF) ecological model is coupled with hydrodynamic model to understand the interaction of hydrographic characteristics and ecological dynamics in the study area. Operator splitting method is used to handle two different physical and biological scales for numerical simulation of the resulting partial differential equations. Gulf of Kachchh (22°20'N–23°40'N, 68°20'E–70°40'E), in the northwest coast of India is used for the application and validation of the model’s behaviour. This region demonstrates rich biodiversity and productivity in highly turbid and varying marine conditions. Co-ordinate transformation is used to convert the irregular coastal geometry of Gulf of Kachchh into a rectangular domain. Numerical experiments, together with sensitivity analysis are carried out to get the values/ranges of the model parameters. The model application is able to bring out many striking features of the Gulf of Kachchh including bimodal oscillations observed in the ecological data of the region.

Keywords

Gulf of Kachchh, Physico-Biological Model, Plankton and Forage Fish.
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  • Kumari, B., Raman, M. and Mali, K., Locating tuna forage ground through satellite remote sensing. Int. J. Remote Sens., 2009, 30(22), 5977–5988.

  • Evans, G. T. and Parslow, J. S., A model of annual Plankton cycles. Biol. Oceanogr., 1985, 3, 327-347.

  • Fasham, M. J. R., Ducklow, H. W. and Mckelvie, S. M., A nitrogenbased model of plankton dynamics in the oceanic mixed layer. J. Mar. Res., 1990, 48, 591–639.

  • Edwards, A. M., Adding detritus to a nutrient–phytoplankton–zooplankton model: a dynamical – systems approach. J. Plankton Res., 2001, 23(4), 389–413.

  • Lehodey, P., The pelagic ecosystem of tropical Pacific Ocean: dynamic spatial modelling and biological consequences of ENSO. Prog. Oceanogr., 2001, 49, 439–468.

  • Lehodey, P. et al., Predicting skipjack forage distributions in the equatorial Pacific using a coupled dynamical bio-geochemical model. Fish. Oceanogr., 1998, 7, 317–325.

  • Mohanty, R. K., An operator splitting method for an unconditionally stable difference scheme for a linear hyperbolic equation with variable coefficients in two space dimensions. Appl. Math. Comput., 2004, 152, 799–806.

  • Khan, L. A. and Liu, P. L. F., An operator splitting algorithm for coupled one-dimensional advection–diffusion–reactions equations. Comput. Methods Appl. Mech. Eng., 1995, 127, 181–201.

  • Wheeler, M. F. and Dawson, C. N., An operator-splitting method for advection–diffusion-reaction problems. Technical report 87-9, Mathematical Sciences Department, Rice University, Houston, Texas, 1987.

  • Kunte, P. D., Wagle, B. G. and Sugimori, Y., Sediment transport and depth variation study of the Gulf of Kutch using remote sensing. Int. J. Remote Sens., 2003, 24(11), 2253–2263.

  • Shirodhkar, P. V., Pradhan, U. K., Fernandes, D., Haldankar, S. R. and Rao, G. S., Influence of anthropogenic activities on the existing environmental conditions of Kandla Creek (Gulf of Kutch). Curr. Sci., 2010, 98(6), 815–828.

  • Bhaskaran, M. and Gopalakrishnan, P., Observations on the marine plankton in the Gulf of Kutch, off Port Okha. Indian J. Fish., 1971, 18(1&2), 99–108.

  • Shankar, D., Vinayachandran, P. N. and Unnikrishnan, A. S., The monsoon currents in the North Indian Ocean. Prog. Oceanogr., 2002, 52, 63–120.

  • Steel, J. H., Plant production in the northern North Sea, Scottish Home Department. Marine research report No. 7. HMSO, Edinburgh, 1958.

  • Dube, A., Jayaraman, G. and Rani, R., Modelling the effects of variable salinity on the temporal distribution of plankton in shallow coastal lagoons. J. Hydro-Environ. Res., 2010, 4(3), 199–209.

  • Rani, R. and Jayaraman, G., A minimal model for Plankton dynamics in shallow coastal lagoons – Chilika lagoon, a case study. Int. J. Emerging Multidiscipl. Fluid Sci., 2010, 2(2–3), 123–141.

  • Ishizaka, J., Coupling of coastal zone color scanner data to a physical–biological model of the Southeastern US continental shelf ecosystem, 2, An Eulerian Model. J. Geophys. Res., 1990, 95(C11), 20201–20212.

  • Chauhan, O. S., Jayakumar, S., Menezes, A. A. A., Rajawat, A. S. and Nayak, S. R., Anomalous inland influx of the River Indus, Gulf of Kachchh, India. Marine Geol., 2006, 229(1), 91–100.

  • Chu, P. C., Ivanov, L. M. and Margolina, T. M., On non-linear sensitivity of marine biological model to parameter variations. Ecol. Modell., 2007, 206, 369–382.

  • Kumar, V. and Jayaraman, G., Operator splitting technique in biological oceanography – Central Arabian Sea, A Case Study. In Proceedings of Fluid Mechanics and Fluid Power, Society of IIT Bombay, 2012, pp. 225-1–225-7, ISBN 978-81-925-494-0-8.


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  • Modelling of Plankton and Forage Fish Variability in the Gulf of Kachchh Using 2D Coupled Physico-Biological Model

Abstract Views: 322  |  PDF Views: 124

Authors

Vijay Kumar
Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016, India
Girija Jayaraman
Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110 016, India
Beena Kumari
Space Applications Centre, Indian Space Research Organisation, Ahmedabad 380 015, India

Abstract


A biophysical coupled model, which includes interaction of processes at different spatial and temporal scales, is used to assess the seasonal variability of plankton and forage fish. A five-compartment nutrient, phytoplankton, zooplankton, detritus, forage(NPZDF) ecological model is coupled with hydrodynamic model to understand the interaction of hydrographic characteristics and ecological dynamics in the study area. Operator splitting method is used to handle two different physical and biological scales for numerical simulation of the resulting partial differential equations. Gulf of Kachchh (22°20'N–23°40'N, 68°20'E–70°40'E), in the northwest coast of India is used for the application and validation of the model’s behaviour. This region demonstrates rich biodiversity and productivity in highly turbid and varying marine conditions. Co-ordinate transformation is used to convert the irregular coastal geometry of Gulf of Kachchh into a rectangular domain. Numerical experiments, together with sensitivity analysis are carried out to get the values/ranges of the model parameters. The model application is able to bring out many striking features of the Gulf of Kachchh including bimodal oscillations observed in the ecological data of the region.

Keywords


Gulf of Kachchh, Physico-Biological Model, Plankton and Forage Fish.

References





DOI: https://doi.org/10.18520/cs%2Fv113%2Fi06%2F1107-1119