The interpretation of changes in erosion rates during the initial period of very fast erosion involves considering a combination of factors.
During this rapid erosion phase, the river may be in the process of establishing a new channel at a lower bed elevation. This can be attributed to changes in the river's flow dynamics, sediment transport, or external factors such as land use changes, dam operations, or climate variations.
Changes in erosion rates can be influenced by various environmental factors, including precipitation patterns, geological characteristics, vegetation cover, land use practices, and human activities.
The type of bedrock or sediment in the riverbed and reservoir can also affect erosion rates. Softer sediments are typically more easily eroded than harder bedrock.