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Sea Cliffs and Fronting Wave Cut Platform

Sea Cliffs and Fronting Wave Cut Platform. Originate in settings where there is a relative sea level fall - where land surface is rising at a faster rate than sea level is rising. West Cliff Drive, Santa Cruz, CA. Sea Cliff Retreat – Processes and Timing. Abrasion of a Basal Notch

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Sea Cliffs and Fronting Wave Cut Platform

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  1. Sea Cliffs and Fronting Wave Cut Platform Originate in settings where there is a relative sea level fall - where land surface is rising at a faster rate than sea level is rising. West Cliff Drive, Santa Cruz, CA

  2. Sea Cliff Retreat – Processes and Timing • Abrasion of a Basal Notch • Thresholded Failure • Comminution Lag - Protective Feedback Figure from Hapke and Richmond, 2002, Marine Geology Retreat History Episodic Sea Cliff Failure

  3. Sea Cliff Erosion – feedbacks* grain entrainment - abrasion - positive feedback beach development - wave energy dissipation - negative feedback

  4. Correlation of Wave Runup and Sea Cliff Retreat after: Ruggiero et al., 2001 What about influence of lithology?

  5. Tectonically Active Margin:Santa Cruz Mountains and SF Peninsula Image courtesy of USGS / PG&E Cooperative Research

  6. Monterey Canyon - tectonic offset Figure from Greene et al., 1991

  7. Erosional Geomorphic Features - Marine Terraces Note sharp edges of the modern (actively forming) sea cliffs and diffuse, scraps of terrace treads high in the landscape Highway 1 near Santa Cruz, California

  8. Correspondence of Terrace Elevation with Age/SL highstand From Merritts and Bull, 1989, Geology

  9. Marine Terrace Generation and Degradation* Animation by Robert S. Anderson: http://geomorph.geology.ufl.edu/~adamsp/Outgoing/Animations/bobs_terrace_movie.mov

  10. Isostatic Uplift and Landform Preservation Holocene Beach Ridges - Sweden - isostatic uplift from deglaciation since late Pleistocene = 2mm/yr

  11. Isostatic Uplift of the Florida Platform

  12. Karstostasy - Idealized Animation by Peter N. Adams: http://geomorph.geology.ufl.edu/~adamsp/Outgoing/Animations/FlaEpeir_Run109.mov

  13. Karstostasy – Application to Florida Through the Pleistocene Animation by Peter N. Adams: http://geomorph.geology.ufl.edu/~adamsp/Outgoing/Animations/FlaEpeir_Run125.mov

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