IMPACT ~ Breach Formation (WP2)

Overview of

Breach Work

Programme

IMPACT - WP2 Breach Formation

Summary• The Problem to be Solved / Deliverables

• Overall Approach

• Current situation

• Future programme

Breach Formation

The Problem to be Solved / Deliverables

The Current Position:

• Lack of reliable, accurate, user friendly tools for end users (flood defence / risk management)

• Lack of reliable data for model development / validation

• Lack of understanding of fundamental processes

• Lack of methodology / tool for location prediction

Breach Formation

The Problem to be Solved

Problem to solve:

• The reliable prediction of breach formation (and hence potential:

– flood hydrograph / flood risk

– breach size

• An approach to identifying potential breach location

Breach Formation

The Approach

The overall approach entails combining large scale field work, lab work and numerical model development / application.

5-6m embankments

1:10 scale embankments

Multi-partner

Multi-model

Field Modelling

Lab Modelling

Numerical Modelling

Desk / Data Analysis for Breach Location

Breach Formation

Deliverables

Deliverables:

• Field and lab data on breach formation

– different geometries & materials

• Comparison and development of breach models

• various partner models

• model interface for direct comparison

• commercial products

• Methodology / tool for identifying potential breach location

Breach Formation

Direction:

Analysis of this data permits:

• Assessment of scaling differences between field and lab data

• Comparison of controlled test results against observed field data

• Objective performance assessment of multiple numerical models predicting breach formation

• Base data for validation and model development

Breach Formation

Progress so far:

Now 10 months into a 36 month programme:

• Field test programme underway

– Field Test#1 today

– 3 tests in 2002; 2 tests in 2003

• Lab test programme underway

– Approx. 5/25 tests undertaken

– 9 tests in 2002; 16 tests in 2003

• Numerical modelling commenced

– Field Tests #1 & #2 released

– Further tests for 2002 and 2003

Breach Formation ~ Numerical Modelling

The Theory...• Assemble a team of breach modellers within

IMPACT

• Expand the team with any interested organisations world-wide

• Release test case data periodically (prior to field and lab tests)

• Collate modelling results for comparison through common ‘interface’

• Only release field and lab data to modelling participants, and after numerical modelling results have been submitted

Breach Formation ~ Numerical Modelling

The Practice (so far)...

Modelling data for Num Tests#1/#2:

• IMPACT team members:

– Cemagref (France)

– HR Wallingford (UK)

– Universität der Bundeswehr München (Germany)

• Additional organisations:

– USDA-ARS (US)

– Delft Hydraulics (Holland)

– Foster Wheeler Environmental Corp. (US)

– Lawson & Treloar Pty Ltd (Australia)

– USBR (Tony Wahl - peak discharge eqns) (US)

Breach Formation ~ Numerical Modelling

The Practice (so far)...

Potential participation / data submission:

– Electricite de France (EDF) (France)

– TU Delft (Holland)

– University of Leige (Belgium)

– Finnish Environment Institute (Finland)

– USBR (Ted Yang) (US)

– UCL (Belgium)

– IST (Portugal)

– King Mongkut's University of Technology (Thailand)

– Ecole Polytechnique de Montreal (Canada)

Breach Formation ~ Numerical Modelling

Numerical Modelling Test Cases

Two test cases have been released so far:

• NumTest#1 = Field Test#1

• NumTest#2 = Field Test#2

Additional test cases will be released after this workshop, including:

• NumTest#3 = Field Test#3

• NumTest lab variations

– Soil grading variations

– Geometry variation

– Breach position variation

Breach Formation ~ Numerical Modelling

But, for now...

Mohamad Hassan will review results for

• NumTest#1 now (prior to field visit)

• NumTest#2 tomorrow morning