Which mechanism causes periodic bursts of sediment flow across alluvial fans during flash floods?

💡 Explanation

When flash floods inundate alluvial fans saturation increases pore pressure and reduces effective stress through thixotropic remobilization causing a solid-to-liquid transition which produces bursts of sediment flow. Therefore thixotropic remobilization causes sediment flows, rather than eustatic adjustment lowering gradients, pneumatic transport becoming dominant, or flocculation preventing entrainment, each require different conditions.

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