Which mechanism dominates barrier island migration when sediment supply decreases?

💡 Explanation

Decreased sediment causes landward rollover because Wave-Dominated Coastal Erosion overwhelms deposition, therefore barrier islands retreat landward, rather than seaward accretion which needs sediment or uplift by other geological forces.

• Which outcome occurs when persistent unidirectional winds cause significant changes in beach angle relative to headlands?
• Which risk increases as a coastal lahar increases momentum?
• Which risk increases when Himalayan river discharge diminishes across an alluvial fan?
• Which risk increases when strike-slip motion along an undersea transform fault displaces the seafloor?
• Which risk increases when constructing a multi-story building foundation on unconsolidated alluvial soil near seismic fault lines?
• Which outcome results when increased thermal expansion of equatorial air intensifies?