Which mechanism limits the upslope extent of debris flow deposition within an alluvial fan influenced by tectonic uplift?

💡 Explanation

As debris flows move upslope on a tectonically uplifted alluvial fan, the slope decreases because of the concave fan shape that is created dynamically by deposition, which causes reduced shear stresses and sediment transport competence. Therefore, decreased transport capacity is the primary limit, rather than bedrock weathering, base-level influences to incision, or hillslope vegetation changes, which affect different processes.

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