Which consequence occurs when prolonged river sedimentation exceeds levee subsidence in a delta?

💡 Explanation

When river sedimentation overwhelms levee subsidence, sediment builds up rapidly through breaches called crevasse splays. Because sediment surpasses the original levee height and overflows dramatically from new channels, formation of crevasse splays results, causing rapid changes to river morphology, not just coastal erosion, groundwater changes, or floodplain draining.

• Which erosional feature results from differential freeze-thaw weathering within a glacial cirque headwall?
• Which hydrologic outcome results when atmospheric streams encounter orographic barriers?
• Which mechanism causes stream channel sinuosity in meandering river systems despite continuous downslope flow?
• Which effect characterizes stream morphology along an active transform fault boundary?
• Which risk increases due to freeze-thaw cycles around a cirque?
• Which cave formation risk increases as rainfall decreases?