Which phenomenon allows saltwater intrusion into coastal aquifers behind barrier islands?

💡 Explanation

Overwash transports saltwater over the barrier island during storms through inundation, directly introducing saltwater into the freshwater aquifers; because of this island permeability increases, and saltwater contamination occurs. Therefore, overwash intrusion, rather than other events, alters the salinity gradient.

• Which phenomenon is caused by stress accumulating along a transform fault due to frictional resistance?
• Which solute concentration pattern indicates increased leaching in permafrost thaw?
• Which outcome occurs when intense bioturbation disrupts sediment layering?
• Which mechanism causes formation of elongated grabens adjacent to strike-slip boundaries?
• Which consequence results when tephra accumulation exceeds capacity?
• Which outcome is amplified with increased aeolian ventifact formation?