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Tidal propagation in the Mandovi-Zuari Estuarine network, west coast of India: Impact of freshwater influx

DRS at CSIR-National Institute of Oceanography

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Title Tidal propagation in the Mandovi-Zuari Estuarine network, west coast of India: Impact of freshwater influx
 
Creator Unnikrishnan, A.S.
Shetye, S.R.
Gouveia, A.D.
 
Subject tides
tidal propagation
estuaries
tidal amplitude
 
Description The Mandovi-Zuari estuarine network on the west coast of India consists of shallow strongly converging channels, that receive large seasonal influx of fresh water due to the monsoons. The main channels, the Mandovi and Zuari estuaries, connect the network to the Arabian Sea. Observations show that tidal amplitude in the channels remains unchanged over large distances (approximately 40 km) from the main channels and then decays rapidly over approximately 10 km near the head. To understand the dynamics behind this behaviour, a numerical model for tidal propagation has been used that simulates the observed tidal elevations well. Momentum balance in the model is predominantly between pressure gradient and friction. In the region of undamped propagation, the model behaviour is consistent with the theory that geometric amplification balances frictional decay leaving the tidal unchanged. This balance breaks down near the upstream end, where channels are narrowest, and mean velocity associated with freshwater influx is sufficiently large to prevent upstream propagation of tide. This leads to rapid decay in tidal amplitude. The model also shows that the mean water-level rises in the upstream direction, in the region of the decay
 
Date 2009-01-12T11:10:06Z
2009-01-12T11:10:06Z
1997
 
Type Journal Article
 
Identifier Estuarine Coastal and Shelf Science, Vol.45; 737-744p.
http://drs.nio.org/drs/handle/2264/2098
 
Language en
 
Rights Copyright [1997]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher Academic Press