Date of Award
Master of Science (MS)
Civil & Environmental Engineering
Low-crested and submerged structures (LCS) play an integral part in the stabilization of shorelines for recreational purposes, yet there are a plethora of empirical models and gaps in the understanding of their stability and damage progression. The objectives were: i) to evaluate the present formulae, ii) explore variable importance, iii) formulate a stability model, iv) extend the current datasets and v) explore a new model for LCS. The literature points to an increasing understanding of the initiation of damage of LCS and recent exploration of the shear stress-induced erosion (van Rijn, 2019). Assessment of two existing models (Kramer, 2006 and Van der Meer and Daemen, 1994) points to reliability in predicting initiation of damage but limitations in skill in modelling progression of damage, for Re >40,000. Two analytical models (and two variations) developed herein point to difficulty (skill) in predicting damage initiation (progression) and the benefit of removing transmitted wave energy. A scale model testing programme added 124 new data points and confirms the importance of relative crest height, increased relative vulnerability of the seaward slope and crest and damage progression. Exploration of several improvements in the model was useful in deriving an LCS model that predicted damage similar to the pooled data and offered insights into the importance of i) seaward slope erosion, ii) drag and lift forces, and iii) Shield's stress relation to relative depth and stone size, Re and gradation. Importantly, damage progression is likely to be non-linear. The model is likely to be conservative and best applied for S
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Burgess, Christopher P..
"Stability of Low Crested and Submerged Breakwaters: A Reanalysis and Model Development"
(2021). Master of Science (MS), Thesis, Civil & Environmental Engineering, Old Dominion University, DOI: 10.25777/d7g8-c212