9
The shoaling cross-sections predicted by the model deviate slightly from
the measurements for the three sites, revealing a systematic variation in
character. At station 180, the measurements show a strong asymmetry
attributed to near-shore effects of the coastline, ebb shoal, and jetties. The
model simulation does not reproduce the same level of asymmetry that is likely
due to the approach taken to represent flows at the lateral boundaries. The flow
boundary conditions were developed by applying the flow field from one point
(taken form the ADCIRDC simulation) and applied along the entire boundary.
Furthermore, the affects of littoral currents were not included in this simulation.
At stations 299 and 340, the break from the ambient seabed to the channel tends
to be rounded more in the model simulations. At the base of the channel, the
simulations tend to produce a curved profile, whereas the surveys are flatter.
These systematic variations in profile shape warrant further analysis and may be
due to differences in partitioning in bedload and suspended load between the
actual and modeled processes, as well as to geomorphic constraints in tidal inlet
morphology (Buonaiuto and Kraus (2003). .
-30
Sttattiion 180 (sand)
S a o 21
d)
StStatin n 999s(sti)t)
atio o 2 29 ( il l
-30
-35
-35
-40
-40
-45
-45
-50
-50
-55
-55
3500
4000
4500
5000
5500
3500
4000
4500
5000
5500
Distance Across Channel (ft)
Distance Across Channel (ft)
-30
Stattion 340 (silt)
Staio n 340 (silt)
-35
initial (post dredging)
-40
final profile (simulation)
-45
final profile (measured)
-50
-55
3200
3600
4000
4400
4800
5200
Distance Across Channel (ft)
Figure 8. Measured and simulated channel infilling at three stations along the deep-draft channel
5.
Conclusions
The M3D model was developed to provide predictive capabilities for assessing
channel designs and performance with regard to channel infilling and migration.
M3D was created by combining the M2D circulation model (Militello et al.,
2004) developed under the USACE CIRP and the SLICE model developed as
part of the ONR STRATAFORM project (Nittrouer, 1999). The M3D model is
a three-dimensional extension of the M2D depth-averaged technology.
Previous Page
