Assessment Of Stability and Energy Dissipation Performances of an Antifer Layer Protected Caisson

Year 2015, Volume: 2 Issue: 2, 88 - 104, 03.08.2015

Dursun Zafer Şeker , M. Sedat Kabdaşlı , Murat Çelikoyan Cem Gazioğlu

https://doi.org/10.30897/ijegeo.303548

Abstract

The present study intends to assess the stability and energy dissipation performances of a
breakwater configuration (APC) protected by an antifer layer. For comparison, an ordinary caisson
(OC), which was 5% wider and 10% heavier, was also investigated. Physical models were
implemented and tested under regular and irregular waves; and resulting linear and angular
displacements were directly measured via a photogrammetric method. Additionally, wave forces
and resulting horizontal displacements were estimated both from recorded pressure data and from
individual incident waves by modified Goda method. To calculate the horizontal displacement, the
estimated wave force time series were directly double-integrated, whilst the theoretical method
proposed by Shimosako et al. (1994) were used on the individual force values. Although OC was
tested under shorter durations and had a more favorable superstructure in terms of resisting forces,
the results indicated that APC was significantly more stable. Energy dissipation performance of the
tested configurations were quantified in terms of spectral averaged and phase resolved reflection
coefficients, whereas antifer damage ratio was measured on a block-count basis. Results indicated
that the APC configuration had an enhanced performance of dissipating the wave energy; moreover,
the dissipated energy directly links to antifer damage ratio.

Keywords

Antifer protected caisson, Caisson displacements, Stability performance, Damage ratio, Wave energy dissipation

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