What outcome regularly occurs when levees confine river flow?

💡 Explanation

Increased flow velocity within the river channel causes increased shear stress; therefore, riverbed erosion rate increases due to stream power overcoming sediment resistance, rather than deposition, which requires decreased streamflow. This process is knickpoint migration.

• Which mechanism causes a caldera to form following a large volcanic eruption?
• Which mechanism primarily sculpts the U-shaped profile of fjords?
• Which pattern results from combined Hadley cell circulation and the Coriolis effect on global wind directions?
• Which volcanic hazard leads to increased rates of glacial ice melt during a subglacial eruption?
• Which outcome increases when polar ice melt accelerates?
• Which hazard correlates with caldera formation's intense pyroclastic ejection?