Which phenomenon refers to a high wave generated by a tide crest advancing up an estuary or river?

The phenomenon that refers to a high wave generated by a tide crest advancing up an estuary or river is known as a tidal bore. A tidal bore occurs when a strong incoming tide rushes up a river or estuary, causing a sudden and large wave that can move swiftly upstream against the current of the river. This can create a dramatic effect, especially in areas where the river mouth narrows and the tidal forces are strong.

In contrast, flood current refers to the movement of water toward the land during high tide, while ebb current is the flow of water away from the land during low tide. Tides, on the other hand, are the regular and predictable rise and fall of sea levels caused by the gravitational forces exerted by the moon and sun. While all these terms relate to tidal dynamics and water movement, the specific phenomenon of a tidal bore is characterized by the sharp, rapid wave traveling upstream in a river or estuary.