Which fluvial outcome arises when stream competence decreases abruptly at a mountain front, affecting deposited sediment on alluvial fans?

💡 Explanation

Braided streams develop because decreased competence causes increased deposition of coarse sediment that results in channel splitting and braiding, rather than the formation of a single, sinuous channel; therefore option A, rather than B, C, or D occurs.

• Which geomorphic effect accelerates floodplain widening due to lateral erosion in alluvial rivers?
• Which outcome frequently results along strike-slip faults during interseismic periods?
• Which consequence results when river avulsion occurs near an oxbow?
• Which process determines the angle of repose of an alluvial fan deposit formed by debris flow?
• Which outcome occurs when winds redistribute distal volcanic tephra?
• After prolonged tephra fall, which hazard increases because of landscape destabilization?