Which process rapidly diverts river flow across alluvial fans?

💡 Explanation

Avulsion occurs quickly due to channel aggradation, where sediment buildup raises the riverbed, because this makes it easier for the river to find a steeper path. Therefore, a new channel forms across the fan, rather than staying entrenched due to vegetation.

• Which consequence results when tectonic subsidence creates a depression in a river's floodplain?
• Which mechanism primarily leads to the formation of an oxbow lake cutoff?
• Which consequence results when increased freshwater influx slows thermohaline circulation?
• Which outcome occurs when aeolian sediment reaches capacity?
• Which atmospheric motion results because the Coriolis effect deflects air masses moving poleward in Hadley cells?
• Which outcome occurs when deflation lowers the barrier island elevation?