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← GeographyWhich outcome occurs when extensive rainfall saturates pre-existing weak layers within an alluvial fan?
A)Debris flow initiation and fan destabilization✓
B)Increased sediment sorting by grain size
C)Enhanced mineral weathering and soil formation
D)Accelerated channel incision by bedload transport
💡 Explanation
Debris flow initiation results because increased pore pressure reduces effective stress, triggering slope failure via liquefaction. Resulting flows erode and destabilize the fan. Lowered frictional resistance causes fan destabilization, rather than the other sorting mechanisms or weathering.
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