MASTS NEHM Workshop

19/04/2018

Gunda Wieczorek

Hydrodynamic Modelling of

Loch Shell

Loch Shell – Isle of Lewis

Mid Shell East & West

StornowayStornoway

Residue Results

Model Grid 2D and 3D

Wind Directions at Stornoway

2001 2006

2011

2001 2006

Bathymetry and Hydrographic Survey –

Loch Shell 2014

Current Measurements

Investigation of transport mechanism of pollutants in a Sea Loch

Temperature and Salinity

Mouth Head

Model Results: Depth AveragedDirection 2006Speed 2006Speed 2006

Direction 2001Speed 2001

Model Results: Individual Layers 2006

Model Results: Individual Layers 2001

Model Speed & Direction 2006

Teflubenzuron: Measured vs. Modelled

2016 vs. 2011-2012

Teflubenzuron Modelled Impact

Maximum Extent of Teflubenzuron

Extent during Sampling of Teflubenzuron

• Numerical Hydrodynamic Modelling is required to

address the challenges of a growing aquaculture sector

in Scotland

• SEPA are applying MIKE21 FM and MIKE3 FM trying to

explain measured extent of chemicals.

• Quiescence sea lochs like Loch Shell are difficult to

model accurately and good calibration and validation

data is needed to be able do this

Next steps

• Simulate Emmemectin dispersion in Loch Shell in 2D

• Develop sediment transport model in 3D for

Teflubenzuron & Emmemectin

Thanks!

Summary