Browsing by Author "Suresh, R. R. V."

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A study on the seasonal variability of nearshore waves off Visakhapatnam, east coast of India
(International Journal of Innovative Research and Development, 2012-12) Suresh, R. R. V.; Patnaik, K. V. K. R. K.; Ramesh, U. S.; Misra, S. C.
Wave rider buoy data during the period June 2009 to May 2010 was analyzed to examine the seasonal trends in the nearshore waves off Visakhapatnam, east coast of India. During fair weather conditions, wave heights were observed to be higher in the southwest monsoon season with maximum significant wave height (Hs) of about 2.76m in the month of July and average Hs of about 1.6m. The higher values of spectral band width emphasize that the wave heights covered a wide range for major period of the year. A large standard deviation of swell period represents the occurrence of distant swell in a wide range to the study region. The seasonal cycle of wave heights off Visakhapatnam, East Coast of India is dominated by SW monsoon winds. The waves at study area are resultant of sea and large swells from south of Bay of Bengal
Acoustic estimation of suspended sediment concentration from turbidity in the nearshore areas off Visakhapatnam
(INCHOE2014 (Proceedings), 2012-02-05) Patnaik, K. V. K. R. K.; Suresh, R. R. V.
Patnaik, KVKRK., Suresh, RRV., 2014. Acoustic estimation of suspended sediment concentration from turbidity in the nearshore areas off Visakhapatnam, Proceedings of the Fifth Indian National Conference on Harbour and Ocean Engineering (INCHOE2014), 5-7 Feb. 2014, CSIR-NIO, Goa, India. Accurate estimation and monitoring of suspended sediment concentration in the nearshore areas is a challenging task involved in the maintenance of draft of navigational channels, ports and harbors. In the nearshore environment Suspended Sediment Concentration varies significantly both in time and space in response to various forcing mechanisms. Though estimation of this through Acoustic remote sensing is a surrogate method, it is proved to be a best method. The present study is based on the simultaneous data obtained from 600 Khz workhorse ADCP, Turbidity sensor and LISST portable. ADCP was side mounted to BTV Sagar Manjusha at a depth region of 20m and programmed to record the data for every one minute for the period of 3 days to cover six tidal cycles. These data are used to develop a location specific version of the sonar equation which converts the ADCP echo intensity to turbidity (NTU). This equation was obtained by relating echo intensity and turbidity. It is also found that the particle size in the study area ranging from 50 – 400 μm. It is also found that the estimated turbidity is in good agreement with the measured turbidity values.