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Department of Civil Engineering – Ghent University Master Programme in Civil Engineering

Experimental validation of empirical design of a scour protection around monopiles under combined wave and current loading. Department of Civil Engineering – Ghent University Master Programme in Civil Engineering Promoter Prof. dr. ir. Peter Troch Support Staff

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Department of Civil Engineering – Ghent University Master Programme in Civil Engineering

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  1. Experimental validation of empirical design of a scour protection around monopilesunder combined wave and current loading Department of Civil Engineering – Ghent University Master Programme in Civil Engineering Promoter Prof. dr. ir. Peter Troch Support Staff ir.LeenBaelus, dr. ir.Leen De Vos ir.AnneliesBolle(IMDC) Nicolas Loosveldt Kenneth Vannieuwenhuyse

  2. Experimental validation of empirical design of a scour protection around monopilesunder combined wave and current loading Nicolas Loosveldt Kenneth Vannieuwenhuyse

  3. Experimental validation of empirical design of a scour protection around monopilesunder combined wave and current loading Nicolas Loosveldt Kenneth Vannieuwenhuyse

  4. offshore wind farm • Thornton Bank (30 km offshore) • 300 MW • design of scour protection around monopiles under combined wave and current loading

  5. Problem statement

  6. Previous research … • PhD research Leen De Vos (2008) • empirical design formulaeforscourprotection, based on physicalscale model tests • requiredstone diameter for a [limited] range of wave conditions, currentvelocities and water depths • mainly static design, start-up of dynamic design • … basis for present research

  7. objectives of master thesis • newphysical model tests • extension of tested parameter ranges • largerstonesizes • “currentopposingwaves” cases • smaller and larger water depths • monopile diameter • long duration tests • overall damagenumber • experimentalvalidationánd new results

  8. scale model tests • flume dimensions: L x W x H = 30m x 1m x 1.2m • wave generation using wave paddle • tidal currents in 2 directions (Qmax = 300 m³/h) • scale of tests: 1:50 (length scale) • sand box: 4m length, sand d50: 100 mm • scour protection: loose rocks (rip-rap) placed on a filter

  9. instrumentation

  10. methodology • initial profile of scour protection prior to wave and current loading • test run using wave and current loading • obtained profile of scour protection after 1000 waves, 3000 waves,…

  11. mainresults • “validation” of De Vos formulafordamage S3D, but: • largerscatter: • largerstones • smaller water depth • currentopposingwaves • effect of pile diameter • damagestabilises after 5000 waves VLIZ AWARD (2013) predicteddamage De Vos (2008) measureddamage in test

  12. Experimental validation of empirical design of a scour protection around monopilesunder combined wave and current loading Nicolas Loosveldt Kenneth Vannieuwenhuyse

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