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    Numerical models

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    Mandovi_Zuari_Estuaries_2007_Chapter_3.pdf (431.8Kb)
    Date
    2007
    Author
    Unnikrishnan, A.S.
    Manoj, N.T.
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    Abstract
    Various numerical models used to study the dynamics and horizontal distribution of salinity in Mandovi-Zuari estuaries, Goa, India is discussed in this chapter. Earlier, a one-dimensional network model was developed for representing the complex estuarine system of Mandovi and Zuari. The network model could simulate and explain the observed decay of tides at the upstream side (Ganjem in Mandovi and Sanguem in Zuari estuary) caused by the high freshwater discharges during the southwest monsoon season. The observed increase in mean sea level during the period of high river discharge was also well simulated by the model. Recently, a ‘hybrid model’ was developed, using a two-dimensional model for the wider regions of the estuaries and a one-dimensional model for narrower regions. The hybrid model is used to simulate the horizontal circulation and salinity distribution. It is found that the model reproduced the longitudinal salinity distribution in the estuaries very well during the dry season and reasonably well during the wet season. The above studies showed the utility of numerical models in studying the dynamics of Mandovi- Zuari estuaries as well for determining the distribution of passive tracers such as salinity. Treating the estuaries to be well mixed developed most of the above models. This is a good approximation to simulate horizontal distribution of active and passive variables. The future challenge lies in developing capability to simulate the distribution in the vertical.
    URI
    http://drs.nio.org/drs/handle/2264/626
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