Abstract
Increased severity of damage to estuarine rock structures have been observed across the major German estuaries during the past two decades. These damages are predominantly caused by long-period primary ship waves, which can result in load cases that are particularly erosive to the rock armour layer. To date no design methods exists to dimension structures for long-period ship wave loads. This study presents an innovative groyne design optimized for resistance to ship-induced waves. During a field trial data were collected which allow for the characterisation of wave-structure-interaction as well as loads and damage parameters for the future development of validated design methods.Recorded Presentation from the vICCE (YouTube Link): https://youtu.be/FnrU8AKBITo
Highlights
OPTIMIZED DESIGN Based on the characteristic pattern of damage observed at deteriorated groynes an optimized design was developed
FIELD EXPERIMENT After testing the performance of optimized design variants in hydraulic scale-model experiments, a prototype recessed groyne was built in the estuarine waterway of the Elbe, at a location highly exposed to ship-induced waves
Results indicate that the modifications to groyne geometry are effective in reducing hydrodynamic loads and increasing armour layer stability in vulnerable areas of the groyne (Melling et al, 2020)
Summary
OPTIMIZED DESIGN Based on the characteristic pattern of damage observed at deteriorated groynes an optimized design was developed. This design accounts for the vulnerability of the groyne root and crest areas to high-velocity overtopping flow and was investigated in BAW 2015. To allow wave energy to bypass the structure, the transition area from groyne body to revetment is fashioned as a wide recess secured with scour protection (Figure 1).
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