Here’s a fascinating look at the bizarre ‘Fish Scale Tide’ that occurs on China’s Qiantang River that could have something to do with the area’s rotary currents. The latter happens when the current speed does change somewhat as the current rotates, resulting in an ellipse pattern.
Since a rotating current can change its direction of flow over the course of a tidal cycle without changing its speed, this means that the waves colliding at oblique angles create these fish scale-like patterns. The Qiantang River is located in China’s Zhejiang Province, and those looking to catch this rare tide should visit during mid-August each year. This river also features the world’s largest tidal bore, a phenomenon where leading edge of the incoming tide form a wave that can rise to a height of 9 meters (30 feet) and travel up the river at speeds of up to 40 km/h (25 mph).
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