Wind-driven estuarine turbidity maxima in Mandovi Estuary, central West coast of India

Kessarkar, Pratima M. ; Purnachandra Rao, V. ; Shynu, R. ; Ahmad, Ishfaq Mir (2009) Wind-driven estuarine turbidity maxima in Mandovi Estuary, central West coast of India Journal of Earth System Science, 118 (4). pp. 369-377. ISSN 0253-4126

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Systematic studies on the suspended particulate matter (SPM) measured on a seasonal cycle in the Mandovi Estuary, Goa indicate that the average concentrations of SPM at the regular station are ~20mg/l, 5mg/l, 19mg/l and 5mg/l for June–September, October–January, February–April and May, respectively. SPM exhibits low-to-moderate correlation with rainfall indicating that SPM is also influenced by other processes. Transect stations reveal that the SPM at sea-end stations of the estuary are at least two orders of magnitude greater than those at the river-end during the monsoon. Estuarine turbidity maximum (ETM) of nearly similar magnitude occurs at the same location in two periods, interrupted by a period with very low SPM concentrations. The ETM occurring in June–September is associated with low salinities; its formation is attributed to the interactions between strong southwesterly winds (5.1–5.6ms-1) and wind-induced waves and tidal currents and, dominant easterly river flow at the mouth of the estuary. The ETM occurring in February–April is associated with high salinity and is conspicuous. The strong NW and SW winds (3.2–3.7ms-1) and wind-driven waves and currents seem to have acted effectively at the mouth of the estuary in developing turbidity maximum. The impact of sea breeze appears nearly same as that of trade winds and cannot be underestimated in sediment resuspension and deposition.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Suspended Particulate Matter; Monsoons; Turbidity Maximum; Winds; Estuarine Sedimentation
ID Code:64213
Deposited On:07 Oct 2011 06:06
Last Modified:18 May 2016 12:42

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