Why are the waves in Xiamen so small?

1, geographically, there are different wave conditions at the confluence of Xiamen ocean currents and along the coast.

2. Topographic features, underground reefs and surrounding islands will all interfere with the wave flow in Xiamen and produce different wave impact forces.

3. Astronomy and time conditions. At the beginning of the full moon, these different astronomical conditions will cause changes in the interstellar gravitational field, and then affect the wave performance in Xiamen.