You may already know that the Bristol Channel has the second largest difference in the world between high tide and low tide. Here a some photographs taken from Wain's Hill in Clevedon looking towards Weston-super-Mare. They were taken at different times of one Summer's day that show a little bit of that tidal effect.
1. Taken at 16:01
2. Taken 16:31
3. Taken at 17:01
4. Taken at 17:29
Amazing really that in just one and a half hours such a colossal volume of water gets shifted. Or is it staying where it is and the solid earth is rotating beneath it?
Finally, here is a different view looking towards Wales later in the day at 20:20