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Wave impacts on storm walls. A study on scale effects
Marinov, K.K. (2017). Wave impacts on storm walls. A study on scale effects. MA Thesis. Delft University of Technology. Faculty of Civil Engineering and Geosciences: Delft. 120 pp.
Author keywords
    Physical modelling,wave impacts, scale effects, Froude scaling,overtopping, storm wall, impact force, post-overtopping flow, terrestrial lease scanner,measurement techniques,bore impacts, pre-impact flow evolution
Auteur  Top 
  • Marinov, K.K.
Abstract
    Low-lying countries such as Belgium and the Netherlands are naturally susceptibleto overtopping wave attacks. Coastal regions are therefore facing the threat of such events causing damage todike-positioned structures and buildings. Research in this filed is often conducted using scaled-down 2D hydraulic physical models, which introducesso called scale effectsthatcan bias the results with regard to measured wave-structure impact forces. This thesis therefore attemptsto determine the effects of scalingfor post-overtopping wave impacts. To achieve this, large scale physical modelling tests were conducted at Deltares’ Delta flumeand compared with a small scale model of similar configuration. A second thesis aim stemsfrom the application of measurement devices in an innovative manner whileconducting the large scale tests, and their applicability is assessed here. The model comparison shows that in general the small scale testperforms very similarly to its large scale counterpart,and scaling effectsdid notappear tobias the impact events considerably.This was also observed for the pre-impact flow evolution, where the wave interference mechanisms and resulting bore characteristics were also largely similar.The force-time signal for the largest impact also is related to the pre-impact mechanisms observed.Classification of the extreme bore impacts according to their impact peak ratio did outline a discrepancy between the two models, which was also linked to the difference inentrapped air pocket impacts.The four measurement instruments assessed are a Terrestrial Laser Scanner (TLS), waterproof action camera(s), optical phase detection probe (OPDP) and a high speed camera mounted behind an opening in the impacted wall. Data from the former two was also used in this analysis and their performance was determined to be good.
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