A Regional Coastal Modelling System for the North West from Wales to Scotland - Samantha Mullan (Intertek)

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2015 DHI UK & Ireland Symposium A Regional Coastal Modelling System for the North West – from Wales to Scotland Samantha Mullan (Intertek), Tuesday 21 April 2015 at 12:20 - 12:40 Intertek has developed a regional coastal modelling system for United Utilities. This modelling system covers UU’s entire area of interest and stretches from the north Wales coast to the southeast coast of Scotland, including complex and dynamic environments such as the Ribble Estuary, Morecambe Bay and the Solway Firth. To develop an efficient and practical system that provides the client with an assessment and management tool that meets their requirements, with sufficient resolution in all areas of interest over such a large and varied region, has been challenging. The presentation will provide an overview of the modelling system, including the techniques employed, and some of the difficulties experienced.

Ingenieurwesen

www.intertek.com1
A Regional Coastal Modelling
System for the North West – from
Wales to Scotland
Intertek
Samantha Mullan
21st April 2015

www.intertek.com2
• Project Overview
• Model Construction
• Model Calibration
• Model Applications

www.intertek.com4
Project Aims and Objectives
UU requires a regional wide water quality
assessment of designated bathing and
shellfish waters in the North West region
Project aims:
• Develop state-of-the-art regional coastal models
covering all of north west
• Undertake environmental impact assessments
• A flexible and future-proofed tool for asset
management

www.intertek.com6
Model Development Process
• Agree model
requirements
• Data collation and gap
analysis
• Bespoke field surveys
(CREH)
• Model development
• External audit and
sign-off
• Applications

www.intertek.com8
North West Coastal Modelling System (NWCMS)

www.intertek.com9
Detailed Models – 2 variants

www.intertek.com10
Detailed Model Example – Cumbrian coast

www.intertek.com11
Detailed Models – Mesh (Duddon Estuary)

www.intertek.com12
Bathymetry Data Sources

www.intertek.com13
Examples of LiDAR and Bathymetry Data

www.intertek.com14
Bathymetry and Boundaries
• LiDAR, Multibeam, single beam
and digital contours and depth
soundings were used.
• All models were built to a
common datum.
• Natural Neighbour interpolation
• Open boundaries

www.intertek.com16
Calibration Process
• Constructed, calibrated and
validated to the guideline
standards
• Each model was calibrated
against measured field data
from a variety of sources.
• Model validation was also
undertaken.

www.intertek.com17
Model Audit
• Models have been independently externally audited.
• Each model has been considered fit for purpose.
• Cloud to Coast (C2C) project – NERC funded
• Models developed for both projects are consistent

www.intertek.com18
Calibration Data Sources

www.intertek.com19
Spatially varying dispersion Coefficients
• Mixing processes in the water bodies
are dominated by variations in flow
regimes resulting from mechanical
dispersion.
• Elder’s formulation
• A spatially varying dispersion map was
created.
• We were able to provide DHI with
project data and feedback in support
for their on-going software
development.
• Calibration was undertaken against
salinity measurements in an iterative
process.

www.intertek.com20
Model Calibration 1
Levels at Workington – spring tide
Currents at Formby against AWAC Data–
spring tide

www.intertek.com21
Model Calibration 2
0
1
2
3
4
5
6
17/12/2013
00:00
17/12/2013
12:00
18/12/2013
00:00
18/12/2013
12:00
19/12/2013
00:00
19/12/2013
12:00
20/12/2013
00:00
Log10(Concentration,cfu/100ml)
Model Results Field Data

www.intertek.com22
Regional Coastal Modelling

www.intertek.com23
Detailed Model – Ribble and Flyde Coast
Add animation of Ribble estuary?

www.intertek.com25
Applications
• Bathing Waters Compliance Assessments
• Shellfish Waters
• Contingency and Risk Planning
• Sediment Transport studies (asset risk)
• Outfall Optimisation and location
• Intelligent Asset Management (future application)

www.intertek.com26
Thank you.
Any Questions?

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