Hydraulic Modelling of 3D structures

Modelling 3D Structures

Rachael Albrighton Richard Allitt Associates Ltd

Modelling 3D Structures 11th November 2016

Introduction

• Modelling 3D structures in 2D such as ponds and embankments is a relatively new advancement within the industry.

• They can be represented using features within InfoWorks ICM or by adding the structures directly into the DTM.

• During detailed design, there is a need to assess the modelling approach used due to the various design stipulations that commonly need to be met.

• This presentation will examine how this issue was overcome during a flood alleviation scheme in Filey

Modelling 3D Structures 11th November 2016

Background

• 18th July 2007, 82mm of rain fell in 90 minutes

• Significant overland flow from the surrounding arable fields

Modelling 3D Structures 11th November 2016

18th July 2007

• Flooded 200 properties, a school & severe erosion to the ravines

Modelling 3D Structures 11th November 2016

Following Flooding

Modelling 3D Structures 11th November 2016

Model Development Timeline

Using tools within

modelling software

Modelling 3D Structures 11th November 2016

Using tools within Modelling Software

Modelling 3D Structures 11th November 2016

Process Issues

• Publically funded industry

• Many stakeholders are non-technical - scheme visualisation is important

• Current modelling practices bespoke and only easily understood by people with modelling experience

Modelling 3D Structures 11th November 2016

Using tools within modelling software

Building 3D Structures into the DTM using Global Mapper

Model Development Timeline

Modelling 3D Structures 11th November 2016

Building 3D Structures into the DTM using Global Mapper

1

Modelling 3D Structures 11th November 2016

Extent and Crest of Embankment

2

Modelling 3D Structures 11th November 2016

Extruded Embankment

3

Modelling 3D Structures 11th November 2016

Extent of Base of Storage Area

4

Modelling 3D Structures 11th November 2016

Final Storage Area

5

Modelling 3D Structures 11th November 2016

Model Development Timeline

Using tools within modelling

software

Building 3D Structures

into the DTM using Global

Mapper

Building 3D Structures into the DTM using 3D AutoCAD

drawing

Modelling 3D Structures 11th November 2016

Using 3D AutoCAD Drawing

1

Modelling 3D Structures 11th November 2016

Contours Combined with DTM XYZ Points

2

Modelling 3D Structures 11th November 2016

Storage Area Clipped

3

Modelling 3D Structures 11th November 2016

Merged into Existing DTM

4

Modelling 3D Structures 11th November 2016

Conclusion

• Whilst current practices are appropriate at the initial design stage, it is not accurate enough in the detailed design stage

• Having a scheme that is incorporated within the DTM is easier to visualise for stakeholders and public and can be used for other purposes

• Current drive of using BIM, working in partnership and visual nature of modelling, seems logical that the next step is to directly add schemes into the DTM.

Thank you