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Tidally-modulated high frequency internal waves in Gautami-Godavari estuary, East coast of India

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Title Tidally-modulated high frequency internal waves in Gautami-Godavari estuary, East coast of India
 
Creator Sridevi, B.
Murty, T.V.Ramana
Sadhuram, Y.
Sarma, V.V.S.S.
Murty, V.S.N.
Prasad, K.V.S.R.
 
Subject Godavari estuary
Stratification
High frequency internal waves
 
Description 1695-1707
Time series temperature and salinity (at 1 hour
interval) and currents data (10 min interval) at surface (3 m) and bottom (14
m), collected in the   Gautami-Godavari
estuary during 25-27 September 2008 were utilized to document the characteristics
of Internal waves (IWs) and to infer their generation mechanism.  Based on the stability criteria, two High
Frequency (HF) significant modes in the Internal Wave (IW) field at frequencies
96.67 cph (10 m depth) and 71.15 cph (14 m depth) have been identified. At
these modes, IW parameters viz., wave
length (L), wave number (κ), potential
energy (PE), baroclinic potential energy (BPE)
and phase speed (ci)

 and
displacement function (η(z,t)) have been
computed (with salinity and currents data) objectively by adopting well known
harmonic technique through Principal Component Analysis (PCA). Results revealed
that (1) first mode: IW was found to move with a phase speed of 0.13 m s-1
and wave length of 0.0056 km (wave number=178.64 cycles km-1) having
energies of 0.0006 J m-2 (potential) and 0.0027 J m-2
(baroclinic) whereas (2) second mode: 
0.09 m s-1, 0.0076 km, 131.48 cycles km-1, 0.0055
J m-2, 0.020 J m-2 and 0.094 m s-1 for L, κ, PE, BPE and ci respectively. η(z,t) was found to be
positive (elevation-type IWs) and negative values (oscillation-type) during IW
propagation of two modes respectively wherein 
mode 2 is more energetic (8 times) than mode 1. Tidally-modulated force
may be the possible mechanism to generate HF IWs under ebb period.
 
Date 2016-06-27T10:42:27Z
2016-06-27T10:42:27Z
2014-09
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/34492
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(9) [September 2014]