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← GeographyWhich process dominates when a high sinuosity river forms an oxbow lake during flood season?
A)Diffusional erosion along the banks
B)Sediment aggradation behind the cutoff
C)Avulsion cutting off the meander neck✓
D)Chemical weathering in an anoxic region
💡 Explanation
When a high sinuosity river floods, increased hydraulic forces cause avulsion by rapidly eroding the meander neck, bypassing flow becomes dominant, causing an oxbow lake to form. Therefore, avulsion occurs rather than erosion, aggradation, or weathering primarily caused by steady state hydrodynamic regime.
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