Which risk increases when coastal foredunes erode further?

💡 Explanation

Increased saline intrusion into aquifers is a risk because the loss of the foredune barrier allows greater wave overwash, pushing saltwater inland, due to wave runup raising hydraulic head; therefore, the drinking water degrades, rather than other climate or deep ocean effects.

• Which hazard increases when upstream levee construction alters river sediment deposition patterns?
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