Discussion and Conclusions - Seabergh-Kraus-CEJ-030028

Seabergh-Kraus-CEJ-03
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Interesting to note are the current deflections along the spurs and the increase in

darker (weaker current) area regions, although changes are small.

5. Discussion and Conclusions

This paper has reviewed and updated information on sediment-bypassing methods

for coastal inlets. Focus was placed on weir jetties and jetty spurs as construc-

tive aids for directing sediment to facilitate sediment handling and reduce sediment

transport into an inlet navigation chann4el. Such engineering works should be con-

ducted with the intent of maintaining sediment bypassing between the beaches or

shore adjacent to the inlet. Numerical modeling and physical modeling technology

was described that can aid in the assessments of natural sediment bypassing and

engineering actions to alter and complement natural bypassing.

Previous weir jetty projects were constructed with limited experience in their

response to waves and currents. Examination of these projects shows that adjust-

ments can be performed that should improve their functioning. Spit growth over the

weir has resulted in unwanted bypassing of the deposition basin, causing navigation

channel encroachment and shoaling. Simple changes to offset the basin relative to

the weir edge or use of groins or sediment-training structures can prevent this. Weir