An Insight into Flood Modeller 2d Troubleshooting · PDF fileMass Balance. Froude Number....

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AN INSIGHT INTO FLOOD MODELLER PRO 2D TROUBLESHOOTINGEmma Bullen19th October 2017

© Arcadis 2015

• Introduction• Canal & River Trust Breach Assessment • Flood Modeller Pro 2D• Common Errors and their Solutions • Conclusion

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Contents

© Arcadis 2015

Introduction

Typically 1-2 Canal Breaches per year (Canal & River Trust)

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• Arcadis is the sole provider of professional services for the Canal & River Trust

• Water Management and Resilience Team

• Flood Modeller Pro 2D

© Arcadis 2015

Canal & River Trust Canal Breach Assessments

• Embankments and Culverts

• Risk of Flooding

• Assessment of Potential Loss of Life and Third Party Damages

• Canal & River Trust Allocation

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© Arcadis 2015

Flood Modeller Pro 2D

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© Arcadis 2015

Topographic Information

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Active Area

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Computational Area

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Roughness Data

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Domain Details

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Inflow Point

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0

1

2

3

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0 2 4 6 8 10 12

Flow

(cum

ecs)

Time (hrs)

Flow Hydrograph

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Outputs Tab

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Outputs

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Depth (m) Hazard Flow (m3/sec)

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Depth Animation

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Legend

Inflow Point

Canal

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Damage Calculator

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• Damages Database

• Property Data

• Flood Depth Grid

• Hazard Grid

• Water Level Time Inundation

© Arcadis 2015

So far…

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Common Errors and their Solutions

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• Mass Balance

• Froude Number

• Negative Depths

Fr = 1 Critical FlowFr > 1 Supercritical Flow Fr < 1 Subcritical Flow

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Spatial Diagnostics

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Topography – Flow Paths

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LegendInflow PointCanalRiver

Lower CanalLower Ground

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Topography – LiDAR Smoothing

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LegendInflow PointCanalRiver

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Inflow Point Location

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LegendInflow PointCanalRiverInflow Point_2

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Roughness Patch

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LegendInflow PointCanalRiver

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Solver

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ADITVD

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Timestep

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2

1

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Summary

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Errors

Mass BalanceFroude NumberNegative Depths

Causes

Flows path definitionSteep Topography

Uneven TerrainSolutions

Adjust topography Move Inflow PointAdjust Roughness

Change SolverReduce Timestep

© Arcadis 2015

Conclusions

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• Canal & River Trust Breach Modelling

• Errors and Solutions

Arcadis Birmingham, Bristol, Cardiff, Guildford

emma.bullen@arcadis.com

Assistant Consultant

arcadis.com

Thank you!

Any Questions