Which outcome results downstream when extensive levee construction constricts a river?

💡 Explanation

Increased channel bed sediment erosion occurs downstream because the confinement increases streamflow velocity and shear stress; this is channel incision. Therefore, erosion increases rather than decreasing infiltration, because the river's energy becomes focused vertically.

• Which mechanism causes increased stream meandering as a river flows across a coastal plain?
• Which mechanism causes uplift and step-like terrain along normal faults in extensional environments?
• Which process causes oxbow lake blockage when sediment supply increases within a floodplain system?
• Which phenomenon causes formation of elongated offset drainage patterns along transform faults?
• Which outcome occurs when pyroclastic flow interacts cryosphere environments?
• Which risk increases when seasonal thawing weakens permafrost integrity?