Question

RESONANCE STANDING WAVE (RSW). Assume that a Seiche (with a Characteristic

Period Tc) ALREADY HAS BEEN CREATED by wind setup in a long, deep, enclosed
and narrow lake. What TWO conditions must be present for a RSW to be created in this
narrow basin as this Seiche interacts with the astronomical tide producing forces (TPF)?
Be specific; and remember that the Seiche already has been created, so don't tell me how
it was created - focus on the two conditions for resonance

Answer 1

To create a resonance standing wave as a Seiche interacts with astronomical tide producing forces, the frequency of the basin must match that of the tidal forces, and there must be a constructive interference between the Seiche and the tidal waves.

Step-by-step explanation:

For a resonance standing wave (RSW) to be created in a narrow basin as a Seiche interacts with astronomical tide producing forces (TPF), two specific conditions are required:

1. The natural or characteristic frequency of the basin must match or nearly match the frequency of the tidal forces. This is akin to pushing a swing at the right moment to increase its amplitude.
2. There must be a constructive interference between the Seiche already present in the basin and the incoming tidal forces. This means the waves from both phenomena must align in such a way that their crests and troughs coincide to amplify the wave effect.

Just like a building resonating from an earthquake, these conditions can lead to larger amplitude oscillations within the basin.