Hello in my area when the tide comes into the bay it creates a tidal bore which travels up a river that emptys into the bay.  It travels over 17 km in less than 45 minutes.  Going by earths curvature it has a massive amount of ground to climb as well as the brooks natural decline.  So how if tides come in so slowly takes over 8 hours here how does this tidal bore gain like 9m of height or more to travel that far up river,  when the whole time the wave stays almost exactly 2 feet tall for the entire 45 minutes