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SAX99 Workshop: January 16-18 2001
Naval Submarine Base, Bangor, Washington

Meeting Sessions

The meeting was conducted as suggested by Rob Wheatcroft during the Bangor meeting in April, 2000. Instead of individual presentations, a series of topical sessions were held addressing the questions below. The moderators for each session are indicated.

  1. What are the results of sediment roughness measurements? What are the properties of the large-scale ripple field? Aside from the large-scale ripple, is a single power-law model appropriate? Aside from the large-scale ripple, is the roughness isotropic? [Richardson]
  2. What evidence is there for subcritical penetration due to large-scale ripple? What evidence for other mechanisms? [Thorsos]
  3. How do the various measurements of porosity compare? [Stoll]
  4. What is the status of measuring or inferring values of other Biot parameters (including the uncertainty)? [Chotiros and Stephen]
  5. What is the evidence (including uncertainty) for velocity dispersion? How does attenuation vary with frequency? [Richardson and Bibee]
  6. How do the various permeability measurements compare? What is the accuracy of measured permeability for the methods used? Is the quantity they measure the acoustically relevant one? [Bennett]
  7. What acoustic propagation models are consistent with velocity dispersion and attenuation data? [Darrell Jackson]
  8. What indications were observed for biological and hydrodynamic forcing of sediment properties? What evidence is there that this forcing affected acoustic processes? How much are the results of experiments influenced by our presence? What diurnal variations were observed in backscatter from the seabed and from the water column? Can we tell which is which? [Holliday and Jumars]
  9. What spatial variability (including vertical gradients) was observed in sediment properties? [Wheatcroft and Peter Jackson]
  10. To what extent can we understand the frequency and grazing angle dependence of backscatter? [Williams]
  11. What is the evidence that small-scale sediment heterogeneity affects acoustic processes (propagation, backscattering, and penetration)? [Tang]
  12. What deficiencies or uncertainties are there in acoustic modeling? What additional data analyses can be carried out to further test acoustic models? [Thorsos]

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