Which mechanism causes episodic draining of ice-dammed lakes during glacial retreat?

💡 Explanation

When hydrostatic pressure increases behind an ice dam, stress fracturing exceeds the ice's tensile strength, creating conduits for meltwater release, enabling rapid drainage. Therefore, ice fracturing leads to these outburst floods rather than thermo-erosion, cracking or plucking, which involve differential environmental forcing conditions on glacial substrate.

• Which effect occurs when a major earthquake ruptures a strike-slip fault zone beneath a large dam?
• Which outcome occurs when excessive sediment deposition obstructs proglacial lakes?
• Which atmospheric effect propagates eastward during moderate El Niño events across the Pacific?
• Which risk increases when an alluvial channel experiences increased sediment load during flash flooding?
• Which process primarily drives the formation of a stepped or terraced cirque morphology in mountainous regions?
• Which phenomenon results when trade winds weaken in the Pacific Ocean preventing upwelling in an established gyre?