Measurement of Surf Zone Hydrodynamics Along the Coastline of Pondicherry, India
Surf zone is the most dynamic coastal region with spatially and temporally varying wave, current and sediment transport characteristics. The hydrodynamics along this surf zone is constantly changing and obtaining measurements of currents and waves in the surf zone has always been challenging. Any field measurement attempt along surf zone requires more planning to collect useful data. The present study focuses on the nearshore current mapping using a set of low-cost Global Navigation Satellite System (GNSS)-tracked surface drifters. An array of 10 drifters was deployed on the beach of Pondicherry coastline, where the coastal erosion has been a persistent problem and an artificial reef system is being constructed to regain the beach for the public. The longshore currents and drifter trajectories were recorded throughout the day during flooding and ebbing tide. The results reveal that wave-induced currents are moving toward south to north direction irrespective of any tidal variation. It clearly shows that wave direction plays a major role along this coastline and influences the movement of longshore currents and sediment particles. Simultaneous wave and current measurements were also taken on the same day using WTR and ADCP, the currents were compared with that obtained using drifters and found to be in good agreement. This paper describes the temporal and spatially varying currents along Pondicherry coastline and the results from field measurement campaign.
KeywordsLongshore currents Surf zone hydrodynamics Low-cost GPS drifters
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