2014 IHE EurOtop introduction WAv02 · September 2014 Updating the EurOtop manual on wave...
Transcript of 2014 IHE EurOtop introduction WAv02 · September 2014 Updating the EurOtop manual on wave...
September 2014
Updating the EurOtop manual on wave overtopping
The EurOtop 2 editing team, and summary of proposed work
William Allsop
© HR Wallingford 2014
© Wikipedia.com
UK: £130 billion of assets (homes, businesses) at risk of coastal flooding Annual flooding losses increasing to 2 - 20 times current valuesCoastal erosion annual losses rising by 3 - 8 times
Writing EurOtop 2 – why?
Sea level rise in cm, after THESEUS
© HR Wallingford 2014
Courtesy of Wolfgang Kron, Munich Re –to ICCE 2008.
Writing EurOtop 2 – why?
© HR Wallingford 2014
Writing EurOtop 2 – why?
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© HR Wallingford 2014
Writing EurOtop 2 – why?
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Writing EurOtop 2 – why?
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Writing EurOtop 2 – why?
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Key Requirements Reducing flood risk from overtopping of coastal structures Safety of people at the coast Maintain economic activities behind defence structures Effective management of coastal structures / defences
© www.clash-eu.org/rechts
Writing EurOtop 2 – why?
© HR Wallingford 2014
Better analysing of potential overtopping flows for:
• Assessment of existing defences (which may lead to theiradaptation – typically raising the crest, and/or modifying thegeometry of the seaward face)
• Design of use of protected areas / activities• Planning and design of new defences• Maintenance of existing defences
Writing EurOtop 2 – what will that improve?
© HR Wallingford 2014
Writing EurOtop 2 – how?
Established Author Team from EurOtop 1; expanded for new data and experience Jentsje van der Meer Van der Meer ConsultingHolger Schuettrumpf Aachen UniversityAndreas Kortenhaus Ghent UniversityPeter Troch Ghent UniversityJulian De Rouck Ghent UniversityTom Bruce Edinburgh UniversityWilliam Allsop HR WallingfordTim Pullen HR Wallingford
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Previously
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EurOtop 2 – the changes
Structure of the manual unchanged, improved formulae, some new data, better explanations.Chapter 1: IntroductionChapter 2: Wave and Water Levels – improved discussion on uncertaintyChapter 3: Tolerable Discharges – more discussion on effects of wave
height, supported by videosChapter 4: Prediction of Overtopping – more on numerical modelling Chapter 5: Dikes and Embankments – revised formulae, especially for
small freeboards, gentle and shallow beach slopesNew material from Ghent on use of wave walls
Chapter 6: Armoured Structures – new formulae for berm breakwatersChapter 7: Vertical and Steep Structures – rationalise formulae, effects of
impulsive vs. pulsating breaking
© HR Wallingford 2014
Wave overtopping on inland reservoirs
Many dams with toe of wave wall close to or at the design water level.
Very steep waves, steep slopes, deep water.
Belgian Coastline: the pinch points
Dept. of Civil Engineering UNESCO-IHE, 10 September 2014, p.14
• Stilling Wave Basin (SWB) – ICCE 2006
• Parapet – ICCE 2010
Use of wave walls, primary and secondary
Dept. of Civil Engineering UNESCO-IHE, 10 September 2014, p.15
© HR Wallingford 2014
EurOtop 2 – the changes
Revised EurOtop 2 manual will be downloadable as a .pdf document from the web, sor the current version – see: www.overtopping-manual.com
Supported by:• Calculation Tool to calculate overtopping
discharge using empirical formulae• Neural Network• PC-Overtopping• Videos of overtopping processes
© HR Wallingford 2014
Calculation Tool to calculate overtopping discharge using empirical formulae- To be extended and updated, but little change otherwise
EurOtop 2 – Calculation Tool
© HR Wallingford 2014
EurOtop 2 – Calculation Tool
© HR Wallingford 2014
EurOtop 2 – the changes
Caveats:• Limited resources and mis-match of timing• No new research funding, but making use of all recent research known
to Author Team.To be resolved:• Expansion of database of overtopping measurements, hoping to
consolidate multiple versions• Neural network tools – (no funding but aiming for optimised tool(s)• More advances needed in allowable discharges for people, buildings,
vehicles, grass slopesNote: Some problems are complicated – we prefer to give you guidance where we can, but there will be some aspects left to the user!
© HR Wallingford 2014
EurOtop 2 – Acknowledgements
This activity has partial funding, but relies strongly on good-will and informal support. The EurOtop 2 Team particularly thanks:• Netherlands Rijkswaterstaat• UK Environment Agency (we hope!)• Ghent University; University of Edinburgh; Aachen UniversitySteering Group:• Bas Hofland, Deltares, • Hans van der Sande, Dutch Water Boards, • Daniel Schade, Mohn Consultants, • Leo Franco, Modimar & University of Rome 3, • Hadewych Verhaeghe, Flanders Community, • Corrado Altomare, Flanders Hydraulics, • EA nominees (to be appointed)
© HR Wallingford 2014
EurOtop 2 – after today
Editing EurOtop 2 (NB - still subject to funding support)
• First full (internal) draft before Christmas• Reviewing (internal) January 2015• Editorial meeting 26-27 March 2015• Production summer 2015
Today’s presentations and supporting material to be available through IHE
News to be posted on www.overtopping-manual.com