The geomorphic evolution of many landscapes is fundamentally deter- mined by the evolution of the river channels and their interactions with hillslopes. Consequently, models of landscape evolution ought to track the evolution of the Channel geometry so as to quantify the rate of erosion of channel bottoms and to Follow the changes in hillslope-channel coupling over time. Unfortunately, the spatial Resolution required to describe channel morphology adequately is computationally Impractical. It is also beyond the resolution of most digital elevation data.
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