12 December 2001
Contact the NAVFAC EICO Office regarding when to perform such site-specific risk
analyses. This is coupled with a three-dimensional numerical analysis of ocean-basin
propagation and near-shore site shoaling of the resulting long wave.
River Discharge and Flood Control Channel Discharge. Where a
harbor site is hydraulically influenced by river discharge, present as well as future river
flood discharge effects on water levels need to be considered. Effects of river
discharge on harbor hydrodynamics are discussed briefly in Section II-7-6 of the CEM.
Deltaic processes, river mouth flow, and sediment disposition, and inlet processes and
dynamics are discussed in Section IV-3.
Extreme Water Levels. The estimation of extreme water levels is
discussed in Section II-8-6-e of the CEM.
Numerical Modeling of Long Wave Hydrodynamics. Due to the
complexity of most natural flow systems, engineering analyses for coastal engineering
design projects often require numerical modeling of the hydrodynamic processes.
Methods for applying this analytical tool are described in Section II-5-7 of the CEM.
NAVFAC EICO Office should be contacted when contemplating using numerical
HARBORS. Because harbors are, by nature and design, protected from
short wave effects, long wave processes primarily drive their hydrodynamic
environment. Specific information on these processes is examined in the sections on
tides, seiche, storm surge and other long wave phenomenon. Section II-7 of the CEM
covers the hydrodynamics of harbors, including effects of wave action,
flushing/circulation, and vessel interaction. The discussion of inlet hydrodynamics
contained in Section II-6 of the CEM also adds insight into the processes that take
place at the entrance of a harbor and impact its overall hydrodynamic environment.
The impact of these processes on moored ships and criteria for acceptable ship
motions in safe working conditions is contained in the Permanent International
Association of Navigation Congresses (PIANC) report titled Criteria for Movements of
Moored Ships in Harbours - A Practical Guide.
General Function. A harbor is described as a water area that is bounded
by natural features or manmade structures or a combination of both. As such, it
provides refuge and safe moorings and protection for vessels during storms or
accommodations for such water to water or water to land activities as resupply,
refueling, repairs, or transferring cargo and personnel. In such cases when a harbor is
used to transfer commercial cargo or passengers, it is designated as a "port". More
specifically, when military services use a harbor or portions thereof, the facility is
referred to as a "military harbor". The landside areas adjacent to military harbors are
also included under this designation because they support various waterborne naval
activities. Additional terms such as naval base, naval station, naval depot, and naval
shipyard are also used depending upon the appropriate support activity.