Variable height tile path on rotating disc/tube

This is for a 3D Unity project with a fixed camera position.

I need to create a disc/tube like shape that will rotate around the y-axis. I want to be able to subdivide the "disc path" (that is, the top surface of this disc/tube shape) into an arbitrary number of polygonal "tiles" and procedurarly generate variable heights for those tiles.

What's the best approach to this problem?

Thanks in advance for your help.