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The “Sinking” of Venice: Subsidence

The “Sinking” of Venice: Subsidence. Joshua Slater. Subsidence. A sinking or settling of earth’s surface Natural Earthquakes Volcanic activity Solution of limestone Man-induced Fluid extraction Mining Loose sediment. Mitigation anticipate monitor, restrict act. fluid injection

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The “Sinking” of Venice: Subsidence

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  1. The “Sinking” of Venice: Subsidence Joshua Slater

  2. Subsidence • A sinking or settling of earth’s surface • Natural • Earthquakes • Volcanic activity • Solution of limestone • Man-induced • Fluid extraction • Mining • Loose sediment

  3. Mitigation anticipate monitor, restrict act. fluid injection import surface water pillars in mines Problems coastal & river areas drainage paths drainage devices sewers, canals irreversible

  4. Venice, Italy

  5. Venice (cont.) • Built - coastal marshes • ~10 ft. since founded • 1ft./century • “aqua alta” • causes • diverted rivers • natural gas • ~20,000 wells • rising sea level

  6. Mitigation closed wells aqueduct moveable barriers Still irreversible Venice (cont.)

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