Which mechanism limits lake formation when downcutting rate exceeds sediment deposition in a fluvial valley?

💡 Explanation

When downcutting exceeds sediment deposition, base-level fall restricts available accommodation space because the stream rapidly erodes downward, preventing creation of a stable floodplain for lake formation. Therefore a reduction in accommodation space results, rather than the effects requires specific processes such as channel migration or bank stabilization.

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