Dispersion and retrievability of water quality indicators during tidal cycles in coastal Salaya, Gulf of Kachchh (West coast of India).

National Institute of Oceanography, Dona Paula, Panaji, Goa, 403 004, India.
Environmental Monitoring and Assessment (Impact Factor: 1.68). 10/2009; 169(1-4):639-45. DOI: 10.1007/s10661-009-1203-3
Source: PubMed

ABSTRACT Bacterial indicators in relation to tidal variations were studied at five locations for over 2 days covering three tidal cycles in the southwestern region of Gulf of Kachchh, India. Tidal flow here is predominantly in the east west direction and can transport particles up to 32 km. Tidal amplitude appears to play a prominent role in abundance, distribution, and dispersal of coliform bacteria examined during this study. Shallow depths, clayey sediments, strong currents, and higher tidal amplitudes appear to rise by an order of magnitude in total bacterial abundance up to 2.4 x 10(4) ml(-1) due to their resuspension from the churned up sediments. Dispersal of allochthonous microflora far into coastal marine regions appears to be governed by the strong tidal amplitude in this region.

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    ABSTRACT: A brief review of various physical processes acting in the Gulf of Kachchh (GoK), which have prominent roles in Gulf dynamics, is presented in this article. The eddies present in the GoK confirm that they are permanent features of the GoK circulation. Accurate estimation of residual currents and eddies in an active industrial coastal zone like the Gulf of Kachchh is important because of its potential applications with respect to discharge of pollutants. Though GoK is considered as a well-mixed system, recent studies revealed that only the central Gulf is well mixed. Stratification in temperature and salinity is noticed in the eastern Gulf, where a cold and high saline tongue is observed in the subsurface layers. Model results indicated the effect of seasonally changing winds the circulation. During southwest monsoon, the predominant westerly winds enhance the flood currents by about 20% and reduce the ebb currents significantly. In spite of semi-arid climate and lack of major rivers flowing into it, the Gulf is highly turbid with suspended sediment concentrations (SSC) during October-November 2002 ranging between 0.5 mg l sup(-1) and 674 mg l sup(-1)

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