Which risk increases approaching the oxbow's filled state?

💡 Explanation

Avulsion risk increases due to sedimentation raising the oxbow's bed, decreasing gradient of the original channel, because the river will preferentially seek a steeper path. Therefore, flow shifts result in a new course over the floodplain, rather than remaining channeled.

• Which mechanism strengthens subtropical high-pressure zones due to Hadley cell dynamics?
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• Which phenomenon enhances coastal upwelling along the western margins of continents due to Ekman transport effect?
• Which mechanism causes increased liquefaction risk during seismic shaking of unconsolidated coastal sediments?
• Which outcome predominates when differential pressure fractures cirque headwalls?
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