Faculty Publications
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Item Sand spit and shoreline dynamics near Terekhol River mouth, Goa, India(National Institute of Science Communication and Policy Research, 2014) C, C.; Kumar, S.J.; Gowthaman, R.; Jishad, M.; Yadhunath, E.M.; Pednekar, P.S.Evolution of shoreline and sand spit at the mouth of the Terekhol River, near Keri beach, located in the Indian state of Goa has been investigated. From the analysis of the data collected, the shoreline oscillation (accretion & erosion) is seasonal up to 2010. A sand spit of 2 m height has been stabilized in 2012 during monsoon in the southern bank of the river which obstructs the natural flow of the river and also hindrance to the ferry transport system. This leads to the unbalanced scenario between the sediment discharge from the river and the littoral transport. Around 2 km stretch of shoreline is under severe erosion in which a stretch of 500 m of sea wall is completely damaged. Sand spit present in the northern part of the shoreline plays a vital role in the shoreline oscillation. Tetrapods were placed recently to protect the eroding part of the coast. Due to the unbalanced littoral movement, the erosion is still persisting and started damaging the new tetrapod protective measure. © 2014, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.Item Surfzone currents at candolim and Miramar beaches of Goa, India: Measurements and comparisons(National Institute of Science Communication and Policy Research, 2014) Yadhunath, E.M.; Seelam, J.K.; Jishad, M.; Gowthaman, R.; C, C.; Pednekar, P.S.Measurements in the surfzone current are often carried out using Acoustic Doppler Velocimeters, Electromagnetic current meters, as well as visual observations based on floats. A simple approach is used to install an Aanderaa current meter in water depths less than a meter and the surfzone currents are measured for a period of about 2 hours during a rising tide. Surfzone wave heights and tide were also simultaneously measured and used to compute wave induced currents based on appropriate equations. The obtained current velocity compared with measured RCM data. Measurements were carried out separately at two beaches (Candolim and Miramar) which have varying topography and different surfzone conditions. © 2014, National Institute of Science Communication and Information Resources (NISCAIR). All rights reserved.Item Surfzone Wave Characteristics during Flood Tide on the Central West Coast of India(World Scientific Publishing Co. Pte Ltd michael.wagreich@univie.ac.at, 2015) Seelam, J.K.; Jishad, M.; Yadhunath, E.M.; C, C.; Gowthaman, R.; Pednekar, P.S.; Luis, R.; Mehra, P.Surfzone wave characteristics, measured using a wave and tide gauge (WTG) during a flood tide, were studied at three different beaches having different nearshore slopes. The spectral wave characteristics viz., wave-height and mean wave period were estimated considering different sample sizes. Inter-comparisons of wave climate between each of three beaches for a similar tide level are presented. The wave-height and mean wave period values obtained from the wave analysis for each of the record using waves by wave method show that surfzone wave-height increased with time during a flood tide and the mean wave period decreased with time up to mid tide and then increased during the rest of the measurement period at Keri and Miramar beaches. At Candolim, the reversing trend of mean wave period increase is observed to occur much before reaching the mid tide level. The surfzone waves during a flood tide indicated that the wave-heights increased with time while the mean wave period showed a decreasing trend in general. The variation of breaker index showed a decreasing trend from low tide to high tide ranging between 0.45 and 0.23. The surf similarity parameter estimated corroborates with the visual observations. © 2015 World Scientific Publishing Company.