Which process dominates surface topography development within a braided stream's alluvial zone during flood events?

💡 Explanation

During floods, flow velocity decreases at the margins, causing differential sediment deposition on natural levees because coarser materials deposit first, building up levee structures and defining channel boundaries. Therefore deposition dominates, rather than cryogenic or chemical weathering which are slower, or aeolian transport which is less significant during floods.

• Which risk increases within flood control channels constructed atop karst bedrock regions?
• Which process explains localized mantle upwelling leading to intraplate volcanism like Hawaii?
• Which mechanism causes braided stream formation across an alluvial plain after rapid glacial retreat?
• Which outcome occurs when a large iceberg melts within the relatively stable Western Pacific Gyre?
• Which risk increases following a catastrophic levee breach due to overtopping during an extreme flood event?
• Which risk increases when upstream river engineering projects disrupt sediment deposition in floodplains adjacent to engineered levees?