Mudbank dynamics: Field evidence of edge waves and far infra-gravity waves

Field experiments in the nearshore ocean to understand the dynamics of mudbank off Kerala, south-west coast of India, are highlighted. Real time monitoring of the nearshore ocean off Purakkad, Kerala was made using pressure transducers for nearshore surface wave measurements, and current sensors for velocity measurements. Comprehensive information on the spatial structure of mudbank was obtained from aerial surveys (video recording from a helicopter). Extensive data collected on surface waves and currents in the nearshore ocean indicate that the infra-gravity (IG) waves (leaky modes and trapped edge wave modes) and far infra-gravity (FIG) waves, coupled with strong shoreline reflections and undertow, play an important role in the dynamics associated with the mudbanks off Kerala.