On the systematic offshore decay of breaker bars

Kathelijne M. Wijnberg*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

15 Citations (Scopus)

Abstract

Multiple breaker bar systems along the Holland coast exhibit long term cyclic behaviour. Over periods of many years, all bars migrate in a net seaward direction; the outer bar decays offshore, and a new bar is generated near the shoreline. This behaviour is essentially a cross-shore redistribution of sediment; the sediment of the offshore decaying outer bar is transported back onshore. This paper presents a tentative evaluation of a part of the hypothesis formulated by Wijnberg (1995) to explain the cyclic bar system behaviour. The systematic offshore decay of the outer bar is considered to be the key to explaining the cyclicity in this behaviour. The offshore decay is assumed to occur due to a change in the long term balance of bar maintaining conditions (breaking waves) and bar diminishing conditions (very asymmetric waves). This balance will change as a result of offshore migration of the outer bar to deeper water during single storm events. The calculations presented in this paper support the hypothesis, but field observations of the hydrodynamic conditions during the process of bar decay are required for a more rigorous verification.

Original languageEnglish
Title of host publication25th International Conference on Coastal Engineering
Pages3600-3613
Number of pages14
Volume3
DOIs
Publication statusPublished - 1997
Externally publishedYes
Event25th International Conference on Coastal Engineering, ICCE 1996 - Orlando, United States
Duration: 2 Sep 19966 Sep 1996
Conference number: 25

Conference

Conference25th International Conference on Coastal Engineering, ICCE 1996
Abbreviated titleICCE
CountryUnited States
CityOrlando
Period2/09/966/09/96

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