Fig. 4. Typical elements of a weir jetty system.

Fig. 3. Concept sketch for reservoir inlet morphology model.

Table 1. Weir Jetty Costal Inlets in the United States.

Seabergh-Kraus-CEJ-03
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January 13, 2004

Progress in Management of Sediment Bypassing at Coastal Inlets

Fig. 4. Typical elements of a weir jetty system.

Figure 4. Typical elements of a weir jetty system.

flows out the navigation channel between the jetties. The flood current is weaker in

the navigation channel, relative to the channel ebb current, promoting net seaward

sediment flushing. Thus, less sediment enters the bay channels, where it is lost to the

beach system if it settles in flood shoals in t27e bay or contributes additional volume

in bay channels that require dredging. A potential benefit for new jetty systems is

that the outer tips of the jetties may not need to extend seaward as far as a system

without a weir jetty, because seaward sediment transport from the beach along the

outside of the jetty is minimized (Seabergh and Lane, 1977). Many variations of this

example (Fig. 4) are possible, depending on structure orientation, bathymetry, and

presence of bottom features such as shoals and rock reefs. Table 1 lists weir jetty

projects in the United States, including length, elevation and orientation of the weir.

Some examples will be discussed below.

Western Governors University

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