Fig. 17. Tool-selection menu of HyPAS
The TDF, Towed Density Follower
(Fig. 18), which can detect fluid mud in
navigation channels, has been upgraded to
include a density sensor and a more accurate
depth sensor. The signal-conditioning deck
unit has been replaced with internal signal-
conditioning hardware to allow for ease of use
and integrated into HYPACK, a commercial
hydrographic survey package. This technology
allows surveying in navigation channels that
have fluidized mud layers moving during
different flow conditions. It can identify fluid
mud and give the density of the material to
Fig. 18. Towed density follower
determine if a navigation hazard exists.
The FFCPT (Free Fall Cone Penetrometer) is a new system developed both to (1) evaluate
material in dredged-material placement cells, and (2) determine geo-technical properties of
deposited material, pore pressure, dynamic viscosity, and dynamic response. Such data aid in
decisions as to whether a cell can hold cap material and the method of dredging it.
All the aforementioned new tools have been integrated into an automatic delivery system for
a small vessel.
TOWARD THE FUTURE
The first level of robust hydrodynamic modeling and many types of models and tools have
been developed in the first 7 years of the CIRP. In the next 5 years, the program will emphasize
sediment transport, morphology change, and performance of navigation channels. For example,
prediction of advance maintenance performance and maintenance requirements associated with
proposed channel deepening will be examined. The CIRP database will be extended to include
channel-performance parameters for serving basic and applied research. Navigation projects
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