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Climate-Induced Saltwater Intrusion in 2100: Recharge-Driven Severity, Sea Level-Driven Prevalence.

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Saltwater intrusion threatens 77% of global coastal areas by 2100. Declining groundwater recharge and sea level rise are key drivers, impacting ecosystems and infrastructure.

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Area of Science:

  • Environmental Science
  • Hydrology
  • Coastal Geography

Background:

  • Saltwater intrusion poses significant risks to coastal communities, affecting freshwater ecosystems and civil infrastructure.
  • Declining groundwater recharge and accelerating sea level rise are the primary drivers of saltwater intrusion.
  • Existing global assessments lack a synthesized approach to these spatially variable processes.

Purpose of the Study:

  • To provide a novel global assessment of future saltwater intrusion risk.
  • To integrate projections of future recharge and sea level rise.
  • To account for regional geological and topographical variations in coastal areas.

Main Methods:

  • Developed a novel model integrating future recharge and sea level rise projections.
  • Incorporated unique geological and topographical data for coastal regions.
  • Assessed global saltwater intrusion risk under various climate scenarios.

Main Results:

  • Nearly 77% of global coastal areas (below 60°N) are projected to experience saltwater intrusion by 2100.
  • Climate-driven recharge decline drives high-magnitude intrusion events.
  • Sea level rise and coastline migration contribute to the widespread nature of intrusion, especially in low-lying regions.

Conclusions:

  • Saltwater intrusion represents a pervasive global threat to coastal environments and human settlements.
  • Understanding the distinct roles of recharge decline and sea level rise is crucial for effective coastal management.
  • Future coastal adaptation strategies must consider both localized geological factors and global climate change impacts.