What is rapidly varied flow? How is it different from gradually varied flow?

Answer 1

Rapidly varied flow is a type of open-channel flow where the water depth changes rapidly over a short distance. This can occur when there are steep slopes, abrupt changes in channel width or shape, or when there are obstacles such as rocks or debris in the flow path.

Gradually varied flow, on the other hand, is a type of flow where the water depth changes slowly and continuously over a longer distance. This type of flow occurs in channels with more gradual slopes and smooth transitions in channel width and shape.

The main difference between rapidly varied flow and gradually varied flow is the rate at which the water depth changes. In rapidly varied flow, the changes in water depth are abrupt and occur over a short distance, while in gradually varied flow, the changes are more gradual and occur over a longer distance.