Uploaded June 2026 | Updated September 2026, 1 week ago
The lecture explores the three primary abiotic forces that shape and control the world's coastal landforms: ocean circulation, tides, and waves. Global ocean circulation acts as a massive conveyor belt—driven by temperature, salinity, and wind—that redistributes heat and nutrients across the planet. Tides, influenced primarily by the gravitational pull of the moon and sun, establish the changing water levels for shorelines, with regions like California experiencing a mixed semidiurnal tide consisting of two uneven high and low tides daily. Finally, waves transmit mechanical energy toward the coast, shifting from circular surface waves in deep water to turbulent breakers near the shore, which dictates the erosion and deposition of sediment. Together with extreme events like storm surges and tsunamis, these dynamic forces continuously interact with local geology to mold the ever-changing beach environment.
The lecture explores the three primary abiotic forces that shape and control the world's coastal landforms: ocean circulation, tides, and waves. Global ocean circulation acts as a massive conveyor belt—driven by temperature, salinity, and wind—that redistributes heat and nutrients across the planet. Tides, influenced primarily by the gravitational pull of the moon and sun, establish the changing water levels for shorelines, with regions like California experiencing a mixed semidiurnal tide consisting of two uneven high and low tides daily. Finally, waves transmit mechanical energy toward the coast, shifting from circular surface waves in deep water to turbulent breakers near the shore, which dictates the erosion and deposition of sediment. Together with extreme events like storm surges and tsunamis, these dynamic forces continuously interact with local geology to mold the ever-changing beach environment.
