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Challenges and Opportunities in Coastal Geomorphology

Challenges and Opportunities in Coastal Geomorphology. Andrew Cooper University of Ulster. December 2010, Dunkeld. Geoscience – understanding the coastal system. Defining Relative Sea level (past and future) Understanding Ice-Earth-Ocean interaction

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Challenges and Opportunities in Coastal Geomorphology

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  1. Challenges and Opportunities in Coastal Geomorphology Andrew Cooper University of Ulster December 2010, Dunkeld

  2. Geoscience – understanding the coastal system • Defining Relative Sea level (past and future) • Understanding Ice-Earth-Ocean interaction • Coastal Response to RSL (and other) forcing Environment and Society • Adaptation • Sustainable shorelines

  3. Gaussian quadratic trend surface models of Holocene land uplift in Scotland. Smith D E et al. Phil. Trans. R. Soc. A 2006;364:949-972

  4. Salt Marsh

  5. Coral Reef

  6. Slow RSL change Rapid RSL change

  7. From Shennan et al. (2006)

  8. Constraints on ‘terrestrial’ approach Limited by depth of incised valley under contemporary estuaries (Late glacial/early Holocene shoreline deposits located well offshore in deep water) Usually guided by contemporary environment (Early shorelines are submerged) Demands high precision in vertical resolution (early RSL rise was rapid)

  9. x Morecambe From Brooks et al. (2008)

  10. Brooks et al. Jour Quat. Sci. (2008) X X X X Lambeck J. Geol Soc. (1996)

  11. The challenge of identifying (much) lower than present sea level indicators Find; Sample; Assign indicative RSL meaning; Age-constrain

  12. The challenge of identifying (much) lower than present sea level indicators Seismic stratigraphy & swath bathymetry Coring Interpretation (RSL indicative meaning) Dating

  13. RSL Indicators Lowstand deltas Maine, USA From Barnhardt et al. (2004)

  14. Incised valleys -56m

  15. -50m KwaZulu-Natal Continental shelf Shoreline deposits KwaZulu-Natal Coast

  16. Northwest Florida 10km Shoreline deposits From Gardiner et al. (2004)

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