January 16-18 2001
Naval Submarine Base, Bangor, Washington
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.
- 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]
- What evidence is there for subcritical
penetration due to large-scale ripple? What evidence for other mechanisms?
- How do the various measurements
of porosity compare? [Stoll]
- What is the status of measuring
or inferring values of other Biot parameters (including the uncertainty)?
[Chotiros and Stephen]
- What is the evidence (including
uncertainty) for velocity dispersion? How does attenuation vary with frequency?
[Richardson and Bibee]
- 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?
- What acoustic propagation models
are consistent with velocity dispersion and attenuation data? [Darrell Jackson]
- 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]
- What spatial variability (including
vertical gradients) was observed in sediment properties? [Wheatcroft and Peter
- To what extent can we understand
the frequency and grazing angle dependence of backscatter? [Williams]
- What is the evidence that small-scale
sediment heterogeneity affects acoustic processes (propagation, backscattering,
and penetration)? [Tang]
- What deficiencies or uncertainties
are there in acoustic modeling? What additional data analyses can be carried
out to further test acoustic models? [Thorsos]