Which failure mode becomes progressively more risky as alluvial fans aggrade in tectonically active regions?

💡 Explanation

As alluvial fans aggrade, the reduced channel slope at the fan's apex is insufficient to efficiently transport sediment, causing deposition and steeper gradients because continued tectonic uplift maintains the elevation. Therefore an increased debris flow hazard arises, rather than biodiversity changes, groundwater depletion, or soil fertility reduction which correlate with significantly different physical processes.

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