Came across the following problem on a question sheet. At its maximum level following deglaciation, approx 11,000 years ago, Lake Melville flooded the Sebaskachu River valley to an elevation of 135m above sea level. However the upper reaches of the Mulligan River and its tributaries were not flooded by Lake Melville. The tributaries of the Sebaskachu River above 135m elevation were not flooded also. What differences in river geomorphology exist between the higher river systems and the Sebaskachu River below 135m?
I know river morphology isused to describe the shapes of river channels and how they change in shape and direction over time. It is a function of a number of processes and environmental conditions, including the composition and erodibility of the bed and banks.Erosion comes from the power and consistency of the current, and can effect the formation of the river's path