Hydrodynamic Stresses Driving Pore Pressure Changes in Sandy Coastal Sediments
1998
Bennett, Richard H.
The project goals are two-fold: to (1) quantify the ambient and dynamic pore water pressures and pore water pressure changes in selected coastal sediments and (2) measure other environmental parameters including water column and sediment properties in support of a NATO Mine Burial modeling study. An important aspect of the work is the quantification of the first order forces responsible for the dynamic bottom pressures and pore pressure behavior in sandy seafloor sediments in response to wave-induced bottom stresses. Objectives of the Phase II (FY-98) field exercise were to collect environmental and sediment properties data in support of the NATO Mine Burial Modeling effort for prediction and evaluation of liquefaction and scour. In addition to the pore pressure measurements collected with a multi- piezometer probe, numerous in situ electrical conductivity measurements provided a statistically reliable sediment property database of porosity, void ratio, wet bulk density and dry bulk density. Sediment sampling with cores and grabs by other participants provided material for detailed grain size analyses and other sediment property tests. Sediments were fine to medium sand. The test site was the same area as the 1997 Phase I experiment (designated as area C-1) conducted in water depths of ~15 meters (plus or minus tidal changes) off the coast of Holland.
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