January 13, 2004
W. C. Seabergh & N. C. Kraus
The concepts of Bruun and Gerritsen (1959, 1960) were quantified in a mathe-
matical model called the Reservoir Model (Kraus, 2000a) for Ocean City Inlet and
subsequently validated at a number of inlets in the United States (Kraus, 2000b;
Militello and Kraus, 2001; Zarillo, Kraus, and Hoek, 2003). This model is based
on interpretation of sediment pathways and knowledge of equilibrium values of the
volumes of morphologic features of ebb shoals.
As an example of application of the Reservoir Model, Shinnecock Inlet, New
York is considered. This inlet has a federal channel maintained to 3 m depth mean
lower low water and includes over-dredging to 6 m to form a deposition basin for
trapping sand to bypass to the chronically eroding beach on the west side. Predomi-
nant longshore transport is to the west, as can be seen from the asymmetrical shape
of the bypassing bars and ebb shoal. Morphologic features for this inlet were identi-
fied through bathymetric surveys and interpretation of aerial photographs (Fig. 1).
Attachment bars (denoted as "A. Bar" in the figure) are locations where sand leaves
or enters the beach in the natural bypassing process. Other features are the ebb
shoal, flood shoal, channel, and bypassing bars. The Reservoir Model was applied
to this inlet for evaluating the flood shoal as a borrow site for bypassing to the
Fig. 1. Morphologic features at Shinnecock Inlet, New York.
Figure 1. Morphologic features at Shinnecock Inlet, New York