However, surfing the Pororoca is especially dangerous, as the water contains a significant amount of debris from the shores of the river (often entire trees), in addition to dangerous fauna. Since 1999, an annual championship has been held in São Domingos do Capim (on the adjacent Guamá River). If the waves surge over the banks, spectators can be swept up. The tidal bore formation controlled by channel. The wave has become popular with surfers. Higher-than-normal high tides push into the harbor, funneling into the river, causing a broad wave that can reach up to 30 feet high. A tidal bore is a natural phenomenon forming a positive surge upstream and it has a remarkable effect on estuary zones and river ecologies. On an equinoctial spring tide, the Moon and Sun fall into direct alignment with the Earth, and their gravitational pull is combined, bringing the Pororoca and others around the world to their peak. The tidal phenomenon is best observed on biannual equinoxes in September and March during a spring tide.
The Amazon's flow reverses, the distance of which depends largely on the rainwater-generated outflow of the Amazon, and a water bulge speeds upstream often with great force, forming a tidal bore with an audible noise. The tide flows upstream against the rivers current and forms waves, according to National Geographic.
#Tidal bore full
Map showing the M2 tidal constituent as quite high in this area, meaning greater tidesĭuring new and full moons, when the ocean tide is highest, water flows in from the Atlantic, rather than the other way around. Tidal bores are strong tides that occur when a river meets the ocean.
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