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


Courtesy of Wolfgang Kron, Munich Re –to ICCE 2008.




September 2014


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



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?


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


Previously


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


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



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


Calculation Tool to calculate overtopping discharge using empirical formulae- To be extended and updated, but little change otherwise

EurOtop 2 – Calculation Tool


EurOtop 2 – Calculation Tool



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!


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)


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

2014 ihe eurotop introduction wav02 · september 2014 updating the eurotop manual on wave...

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