Upwelling
The major upwellings in the ocean are associated with the divergence of currents that bring deeper, colder, nutrient rich waters to the surface. There are at least five types of upwelling: coastal upwelling, large-scale wind-driven upwelling in the ocean interior, upwelling associated with eddies, topographically-associated upwelling, and broad-diffusive upwelling in the ocean interior.
Eddie Aikau
Since its inception (the first Eddie was held at Sunset Beach in 1985; in 1987 Eddie Aikau's younger brother Clyde Aikau won the first Eddie after it moved to Waimea Bay), the tournament has only been held nine times, due to a precondition that open-ocean swells reach a minimum of 20 feet (this translates to a wave face height of over 30 feet). The most recent tournament was in February 2016, when waves in the bay reached 30 to high. The contest invites only 28 big-wave riders to participate in two rounds of competition. The event does not allow the use of jet skis to tow surfers into the waves.