EurOtop - Unesco-IHE

Updating the EurOtop manual on wave overtopping
The EurOtop 2 editing team, and summary of proposed work
September 2014
William Allsop
Writing EurOtop 2 – why?
UK: £130 billion of assets (homes, businesses) at risk of coastal flooding
Annual flooding losses increasing to 2 - 20 times current values
Coastal erosion annual losses rising by 3 - 8 times
© Wikipedia.com
Sea level rise in
cm, after
THESEUS
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Writing EurOtop 2 – why?
Courtesy of Wolfgang Kron, Munich Re –to ICCE 2008.
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Writing EurOtop 2 – why?
September 2014
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Writing EurOtop 2 – why?
September 2014
Page 5
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Writing EurOtop 2 – why?
September 2014
Page 6
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Writing EurOtop 2 – why?
September 2014
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Writing EurOtop 2 – why?
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
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© www.clash-eu.org/rechts
Writing EurOtop 2 – what will that improve?
Better analysing of potential overtopping flows for:
• Assessment of existing defences (which may lead to their
adaptation – typically raising the crest, and/or modifying the
geometry of the seaward face)
• Design of use of protected areas / activities
• Planning and design of new defences
• Maintenance of existing defences
© 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 Consulting
Holger Schuettrumpf
Aachen University
Andreas Kortenhaus
Ghent University
Peter Troch
Ghent University
Julian De Rouck
Ghent University
Tom Bruce
Edinburgh University
William Allsop
HR Wallingford
Tim Pullen
HR Wallingford
© HR Wallingford 2014
Previously
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EurOtop 2 – the changes
Structure of the manual unchanged, improved formulae, some new data,
better explanations.
Chapter 1:
Introduction
Chapter 2:
Wave and Water Levels – improved discussion on uncertainty
Chapter 3:
Tolerable Discharges – more discussion on effects of wave
height, supported by videos
Chapter 4:
Prediction of Overtopping – more on numerical modelling
Chapter 5:
Dikes and Embankments – revised formulae, especially for
small freeboards, gentle and shallow beach slopes
New material from Ghent on use of wave walls
Chapter 6:
Armoured Structures – new formulae for berm breakwaters
Chapter 7:
Vertical and Steep Structures – rationalise formulae, effects of
impulsive vs. pulsating breaking
© HR Wallingford 2014
Wave overtopping on inland reservoirs
Very steep waves,
steep slopes, deep
water.
Many dams with toe of
wave wall close to or
at the design water
level.
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Belgian Coastline: the pinch points
Dept. of Civil Engineering
UNESCO-IHE, 10 September 2014, p.14
Use of wave walls, primary and secondary
• Stilling Wave Basin (SWB) – ICCE 2006
• Parapet – ICCE 2010
Dept. of Civil Engineering
UNESCO-IHE, 10 September 2014, p.15
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
EurOtop 2 – Calculation Tool
Calculation Tool to
calculate overtopping
discharge using empirical
formulae
- To be extended and
updated, but little change
otherwise
© 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 slopes
Note:
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 University
Steering 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)
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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
© HR Wallingford 2014