Which outcome results when a glacial lake outburst nears catastrophic draining?

💡 Explanation

Downstream abrasion increases because a rapid outburst flood leads to vastly increased sediment load and flow velocity; the heightened abrasive action occurs through the mechanism of hydraulic erosion/abrasion. Therefore abrasion increases, rather than any changes to isostasy or chemical weathering, which are much slower.

• Which outcome occurs when deflation lowers the barrier island elevation?
• Which change directly causes alluvial fan deposition at a mountain range exit point?
• Which consequence results when local carbonic weathering exceeds saturation?
• Which consequence results when levees fail catastrophically during exceptional flooding on an alluvial plain containing a major river?
• Which effect on regional climate results when coastal upwelling ceases?
• Which effect results when persistent ice dams form along glacial meltwater streams?