Which outcome occurs on deltas with decreasing alluvial sediment supply?

💡 Explanation

Decreasing alluvial input leads to delta subsidence because sediment loading declines reducing isostatic compensation – the isostatic depression mechanism offsets the delta's weight. This subsidence occurs, therefore, rather than aggradation which needs deposition; overtopping frequency depends on fluvial dynamics rather than just delta subsidence.

• Which outcome occurs when a barrier island migrates landward?
• Which outcome is directly intensified when extensive deflation lowers regional elevation?
• Which outcome occurs when the Sahara's Harmattan winds deposit sediments?
• Which process explains differences in fjord sill depth and isostatic rebound rates?
• Which risk increases when an alluvial river's sediment load is drastically reduced by upstream dam construction?
• Which mechanism causes a meandering stream to erode one bank while depositing sediment on the opposite bank?