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Venice

Venice. Steven Dutch University of Wisconsin-Green Bay. Keeping Dry. City built on wood pilings Deforestation of east coast of Adriatic Piles in anoxic setting, do not decay Many still intact after centuries Foundations of Stone River Diversion to prevent silting of lagoon.

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Venice

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  1. Venice Steven Dutch University of Wisconsin-Green Bay

  2. Keeping Dry • City built on wood pilings • Deforestation of east coast of Adriatic • Piles in anoxic setting, do not decay • Many still intact after centuries • Foundations of Stone • River Diversion to prevent silting of lagoon

  3. Heart of Venice

  4. St. Mark’s Square

  5. St. Mark’s Basilica

  6. Grand Canal and Rialto Bridge

  7. Bridge of Sighs

  8. Future Venice?

  9. If everything beneath Venice is full of water, how can extracting water make Venice sink?Wouldn’t sea water just replace whatever is taken out?

  10. Answer: Artesian Wells

  11. The Big Picture

  12. Water Drawdown by 1975

  13. And Venice Sinks…

  14. Rising Waters

  15. So What’s a Few Inches? • Venice doesn’t have a lot of inches to spare • Acqua alta (High Water) during storm tides and spring tides • Persistent flooding of lower stories • Salt water attack on masonry, metal • Add to other natural sinking • We want Venice to last for centuries

  16. Underwater Mortgage

  17. Saving Venice Stop Pumping Wells • Halted in 1960’s Subsidence and Sea Level Rise • Barriers at Lagoon Mouth What About Large Sea Level Change? • Dikes? • Raise or Relocate Prize Structures? • Abandon?

  18. “Nothing lasts forever but the earth and sky” • “Dust in the Wind,” Kansas “Nothing lasts forever, not even the earth and sky” • Geology

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