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Seabed Testing And Sampling

  1. Recommend the most suited device to (i) collect a seabed surface sample, (ii) collect a sediment core, and (iii) conduct in-situ geotechnical testing of the seabed for the following conditions. Regarding (iii), comment on expected penetration depths.
    • Sandy nearshore environments with significant currents and waves.
    • Estuary with mostly muddy to silty sediments, significant tidal currents, negligible wave action.
    • Deep ocean environments with water depth > 500 m.
    • There are no prior information available about the site.
  2. Draw a conceptual sketch of a CPT including sensors and deployment mechanism.
  3. Describe step by step how to calculate undrained shear strength from CPT testing.
  4. Discuss pros and cons of CPT versus FFP testing.