An Camus , Loch Boisdale · 2017. 7. 20. · An Camus , Loch Boisdale AUTODEPOMOD MODELLING REPORT...

An Camus , Loch BoisdaleAUTODEPOMOD MODELLIN G REPORT

REPORT WRITTEN BYENVIRONMENTAL MANAGE R )

Registered in Scotland No. 138843Registered Office, 1st Floor, Admiralty Park, Admiralty Road, Rosyth, FIFE, KY11 2YW

Marine Harvest ( Scotland) Limited, Stob BanHouse, Glen Nevis Business Park, Fort William, PH33 6RX

01397 715078 01397 703626

Marine Harvest ( Scotland) Limited, Stob BanHouse, Glen Nevis Business Park, Fort William, PH33 6RX

http:// marineharvest. com

Fish Farm Consent ModellingAn_Camus16vF1Results

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CONTENTS

Page

EXECUTIVE SUMMARY 1

1 INTRODUCTION 2

2 MODEL INPUT DETAILS 3

2.1 HYDROGRAPHIC DATA 3

2.2 SITE DETAILS 6

2.3 RUN DETAILS 7

3 MODELLING RESULTS 8

3.1 BIOMASS RESULTS 8

3.1.1 TRANSECT AND SAMPLING STATIONS 9

3.2 IN-FEED TREATMENTS 11

3.2.1 SLICE 11

3.3 BATH MODEL RESULTS 12

4 RESULTS AND CONCLUSIONS 13

REFERENCES 15


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List of Figures

Figure 1 Location of the Salmon Farm ................................................................................. 2

Figure 2 Site current direction frequency from the surface current meter ............................. 4

Figure 3 Current velocity time series from the surface current meter record ....................... 5

Figure 4 bathymetry and cage layout ................................................................................... 7

Figure 5 Benthic impact for run 2, Int-Spring current data .................................................... 8

Figure 6 Location of the selected and spare transects ......................................................... 9

Figure 7 Cross-sections of both the selected and spare transects respectively ................. 10

Figure 8 EmBZ concentrations for run 1 (118 days) .......................................................... 11

List of Tables

Table 1 Summary of Results ............................................................................................... 1

Table 2 A summary of the mean and residual currents recorded at the site......................... 4

Table 3 Project Information ................................................................................................. 6

Table 4 Loch Parameters .................................................................................................... 7

Table 5 Selected and Spare Transect Starting Points ......................................................... 9

Table 6a&b The details of the three selected and spare survey stations respectively ........ 10

Table 7 Modelling Results Summarised ............................................................................ 14


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EXECUTIVE SUMMARY

This report has been prepared by Marine Harvest ( Scotland) Ltd. to meet the requirementsof the Scottish Environment Protection Agency ( SEPA) for the purpose of assessing anapplication to install equipment and consequent biomass, and for consent to use sufficientsealice treatments in a marine salmon farm, via AutoDepomod and dispersion modelling. The report describes biomass, in-feed and bath treatment modelling results for the AnCamus site, a summary of which is provided in Table 1 below. The report held centrally, and previously accredited, by SEPA (AMMR11v02) details modelling methods used.

Table 1 Summary of Results

SITE DETAILS

Site Name: An CamusSite location: Loch Boisdale

Peak biomass (T): 1,471

CAGE DETAILS

Number of cages: 10Cage dimensions: 100m Circumference

Working Depth (m): 12

Cage group configuration: 1(2x4)

HYDROGRAPHIC SUMMARY

Surface CurrentsAverage Speed (m/s) 0.061m/s

Residual Direction 0.030m/s at 342°G

Wind-Influence Slight

Middle CurrentsAverage Speed (m/s) 0.061m/s


Seabed CurrentsAverage Speed (m/s) 0.066m/s


BENTHIC MODELLING

Max fish biomass proposed (T) 1,471

Max Average Stocking Density (kg/m³) 15.4

Distance to the 30ITI contour (m) 76.2

Direction of transect ( T) 307.6

IN-FEED TREATMENTS

Recommended consent mass EmBZ (g) 2,574.2

Equivalent Fish Biomass (T) 7,355

Maximum Treatment Amount EmBZ (g) 515

BATH TREATMENTS

Recommended consent mass in 3hrsAzamethiphos

242.2g cage/treatment, 2.3 treatment/day

Recommended consent mass in 24 hrsAzamethiphos

619.5g cage/treatment, 6 treatment/day

Recommended consent mass in 3 hrsCypermethrin

43.9g cages/treatment8.5 treatment/day

Recommended consent mass in 3 hrsDeltamethrin

16.4g cages/treatment8 treatment/day


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1 INTRODUCTION

This report has been prepared by Marine Harvest to meet the requirements of the ScottishEnvironment Protection Agency ( SEPA) for the purpose of assessing an application toinstall equipment and consequent biomass, and for consent to use sufficient sealicetreatments, via AutoDepomod and dispersion modelling. The report describes modellingresults for the An Camus site in Loch Boisdale ( Figure 1) to determine EQS-compliantbiomass and sea-lice treatment levels for the proposed equipment. Report numberAMMR11v02 which is held centrally, and has been previously accredited, by SEPA, provides details of the generic modelling methods used.

Figure 1 Location of the Salmon Farm


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2 MODEL INPUT DETAILS

2.1 HYDROGRAPHIC DATA

The site data was collected by Marine Harvest for the purpose of assessing a consentapplication with the AutoDepomod software. Methods of the data collection and analysisfollowed current SEPA guidelines (SEPA, 2005); the data used were of 15 days duration andwere analysed using both the appropriate SEPA hydrographic excel template for 20 minutedata and the hg-analysis spreadsheet, also provided by SEPA. The Admiralty HydrographicOffice tide prediction software Total Tide was used to determine the start dates of spring andneap tides and to determine the times of high water and mean tidal height for the area (seeTable 3).

Following SEPA guidelines the start points in the current meter record used for modelling arethose closest to midday on the day of the intermediate spring tides and the intermediateneap tides. In the current meter data used, after hourly averaging, the times of intermediateHW spring and HW neap corresponded to records 43 and 235 respectively. Prior tocommencement of modelling the current data required correction to Grid North and was thuscorrected by 4.522W . The hourly averaged current data for the surface, middle and bottombins were then saved as space delimited files, as detailed in AMMR11v02 and following thedefault AutoDepomod file structure.

Using the hg-analysis spreadsheet the mean speed and the residual current speed anddirection were established for each of the three current meter depths. The mean and residualcurrents, and the histogram frequency peaks are summarised in Table 2 below. The datashowed a residual current in 342O direction at near-surface ( Figure 2) and also 322O and315O at mid- and near-bed depths respectively. A tidal pattern can be seen within therecorded currents and the residual currents increase as we move down the water column. The wind direction was predominantly from the North west and the mean wind speed overthis period was 3.9m/s.


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Figure 2 Site current direction frequency from the surface current meter

SURFACE

Mean speed 0.061m/sResidual Speed 0.030m/s at 342°GResidual Parallel 0.028m/sResidual Normal 0.011m/s

Tidal Amplitude Parallel 0.072m/s

Tidal Amplitude Normal 0.052m/sFrequency Peak 320°G

MIDDLE

Mean Speed 0.061m/sResidual 0.034m/s at 322°G

Frequency Peak 320°G

BOTTOM

Mean Speed 0.066m/sResidual 0.043m/s at 315°G

Frequency Peak 310°G

Table 2 A summary of the mean and residual currents recorded at the site


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Figure 3 Current velocity time series from the surface current meter record


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2.2 SITE DETAILS

The site is situated near the southern shore at the mouth of Loch Boisdale ( Figure 1). MarineHarvest proposes to install 10 pens in a 65m by 75m mooring grid and so the AutoDepomodand the Bath Treatment models have been run to determine EQS-compliant biomass andmedicinal consents for this new equipment. Details of the site are provided in Table 3. Thereceiving water is defined as a loch. The width of the strait and the distance both to theshore and to the head of the loch were calculated from digital Admiralty Charts and areshown in Table 4.

Table 3 Project Information

SITE DETAILS

Site Name: An CamusSite location: Loch Boisdale

Peak biomass (T): 1,471Proposed feed load (T/yr): 3072

Proposed treatment use: Azamethiphos, Cypermethrin, Deltamethrin & Emamectin Benzoate

CAGE DETAILS

Group location: 82633'E, 817340'N

Number of cages: 10

Cage dimensions: 100m circumference

Working Depth (m): 12m

Cage group configuration: 5 x 2

Cage group orientation (° G): 295

Cage group distance to shore (km): 0.23

Water depth at site (m): 24

HYDROGRAPHIC DATA

Current meter position: 82469'E, 817468'N

Depth at deployment position (m): 23.2

Surface bin centre height above bed (m): 18.2

Middle bin centre height above bed (m): 11.2

Bottom bin centre height above bed (m): 2.7Duration of record: 3/4/16 17:00 to 18/4/16 17:00

Current meter averaging interval: 20 min

ADDITIONAL DATA

Magnetic correction to grid North: - 4.522

Predicted Spring Tide 30/04/2016

Predicted Neap Tide 07/05/2016

Predicted Spring Tide 14/05/2016

Mean Tidal Level at Site (m): 2.36

Closest Standard Port Loch Boisdale

Date of Intermediate- Spring Tides: 02/05/2016

Date of Intermediate- Neap Tides: 10/05/2016


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Table 4 Loch Parameters

LOCH PARAMETERS

Area (km2) 8

Length (km) 5

Distance to Head (km) 6.5

2.3 RUN DETAILS

A new project was created in AutoDepomod and named An_Camus16vF1. The site andcage details provided in Table 3 were entered into the appropriate files and all other datawere set to default. The resulting site bathymetry and cage layout is shown in Figure 4. Modelling of both the biomass and chemotherapeutants was undertaken following themethods outlined in the Methods Report AMMR11v02 which is held centrally by SEPA. Details of the modelling results have been provided in the next section according to SEPArequirements.

Figure 4 bathymetry and cage layout

Two types of treatment are used to control sea lice infestation in marine salmon farms andthese require different modelling approaches. The in-feed treatment Slice (active ingredientEmamectin Benzoate) requires deposition modelling using AutoDepomod to predict thechemical accumulation on the seabed beneath the fish cages associated with fish faeces anduneaten treated feed. The bath treatments Salmosan ( chemical name Azamethiphos), Excischemical name Cypermethrin) and Alphamax ( Deltamethrin), where the salmon are

immersed in a diluted solution of the treatment chemical require dispersion modelling topredict the concentration in the water column after release. Results from both AutoDepomodand the Bath model have been provided in the next section.


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3 MODELLING RESULTS

3.1 BIOMASS RESULTS

AutoDepomod was run initially with the company’s preferred stocking density of 15.4kg/m3, and proposed cage layout, using the model’s auto-distribute biomass function. The modeldid not require to iterate to an EQS-complaint solution as a pass was achieved at thisstocking density and pen volume for the resultant maximum allowable biomass of 1,471tonnes.

At this biomass the model predicts the 80% solids area to be 57,281m2 while the flux in thisarea is expected to be 1,484g/m2/year. The proposed layout and tonnage results in a benthiccage area of 32,135m2 with a minimum ITI of 3.4 within the area. The flux in the benthic cagegroup area is predicted to be less than the trigger value ( 10,000g/m2/year) at11,091g/m2/year. The benthic sampling area ( ITI = 30) is expected to be 72,280.3m2 whilethe flux inside this area will be 191.8g/m2/year. The plotted AutoDepomod output for thepassing Int-Spring run 2 is shown in Figure 5. A summary with all of this information can befound in An_Camus16vF1_ marine_sum_v3.xls and in Table 7 of this report.

Figure 5 Benthic impact for run 2, Int-Spring current data

The mass of solids released in run 2 is estimated to be 600,820kg with 80% ( 483,305kg) predicted to remain within the 1km2 modelling grid, thus 20% (117,515kg) of the input load ispredicted to be transported from the model grid as a result of resuspension. The site isclassed as moderately flushed with a vector average residual of 0.03m/s at 342°G indicatingthat this waste material is likely to be dispersed away from the cages in a northwesterlydirection.


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3.1.1 TRANSECT AND SAMPLING STATIONS

Two transect profiles were created ( Figure 6) as part of SEPA’s requirements to determinesite-specific sampling locations. The selected and spare transect information have beensaved to the An_Camus16vF1- BcnstFI-S-2_001.xls file located in the mapping folder. Detailsof both transect starting points are provided in Table 5 below.

Figure 6 Location of the selected and spare transects

Transect Start Point Coordinates

Main Spare

NGR Easting 82350.4 82680.8

NGR Northing 817471.9 817403.9

Bearing°G 307.6 59.3

CD Depth (m) 21.6 23

Table 5 Selected and Spare Transect Starting Points


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Table 6 describe the location and details of the three selected and spare survey stations. Figure 7 shows the cross-sections of the selected and spare transects, and the relevantsurvey stations.

SELECTED

EQS - 10m1st

Station) S1

EQS2nd

Station) S2

EQS + 10m3rd

Station) S3 SPARE

EQS - 10m1st

Station) S1

EQS2nd

Station) S2

EQS + 10m3rd

Station) S3

NGR Easting 82298 82290 82282.1 NGR Easting 82702.3 82710.9 82719.5

NGR Northing 817512.3 817518.4 817524.5 NGR Northing 817416.6 817421.7 817426.9

Distance (m) 66.2 76.2 86.2 Distance (m) 25 35 45

CD depth (m) 22.3 22.4 22.3 CD depth (m) 22.1 22.6 23.9

Modelled ITI 10 10.2 32.5 Modelled ITI 12.5 30 59

Table 6a&b The details of the three selected and spare survey stations respectively

Figure 7 Cross-sections of both the selected and spare transects respectively


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3.2 IN-FEED TREATMENTS

3.2.1 SLICE

The SLICE aspect of AutoDepomod was run initially for a Total Allowable Quantity sufficientto treat 5 times the proposed peak biomass (2,574.25g & 7,355 tonnes respectively). MarineHarvest have followed SEPA’s guidance and used the maximum feedload for the site in themodel, resulting in a feedload of 4,767.8T. The model did not require to iterate to an EQS-complaint solution as a pass was achieved at this quantity and biomass. The predicted areainside the 0.763 g/kg contour (88,730m2) was smaller than the predicted far field AZE area144,904m2). The mean concentration of Slice in the near field AZE exceeds the EQS trigger

value of 7.63g/kg by 233g/kg and thus enhanced monitoring will be required at the site ifSlice is used. The plotted AutoDepomod output for this run is shown in Figure 8. A furtherrun for 223 days duration was performed to obtain a site residual curve for this biomass.

Figure 8 EmBZ concentrations for run 1 (118 days)

The mass of EmBZ remaining on the bed at the end of run 1 was 1571g. For Slice, in theabsence of resuspension, 74% or 1,905g of the input EmBZ load would remain on theseabed after 118 days. This indicates that less than half of the original input load is lostthrough resuspension ( 17.5%). The mass of EmBZ lost from the grid ( 334g) represents anequivalent area of 3.6km2 if it assumed to distribute evenly at the far field EQS concentrationof 0.763g/kg sediment. The footprint shown in Figure 8, together with the results shown inthe HG analysis sheet suggests that material is likely to be transported northwest of the site.


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3.3 BATH MODEL RESULTS

Cage details are given in section 2. The initial cage treatment depth used for the bathtreatments was 1.3m. Using the results from the analysis of the surface current meter datain the short term bath treatment model EQS compliance for both Deltamethrin andCypermethrin at this cage depth was predicted. EQS compliance for Azamethiphos waspredicted at a cage depth of 1.3m.

Cypermethrin & Deltamethrin Results: Cage Treatment Depth = 1.3mPermissible Quantity of Cypermethrin = 43.9g; 8.5 cage/3 hoursPermissible Quantity of Deltamethrin = 16.4g; 8 cage/3 hours

Azamethiphos Results: Cage treatment depth = 1.3mPermissible Quantity of Azamethiphos = 242.2g; 2.3 cage/3 hoursPermissible Quantity of Azamethiphos = 619.5g; 6 cage/24 hours

The permissible quantity of Cypermethrin or Deltamethrin ( 8 cage/3hrs) means that fulltreatment of the 10 pens at the site, would take approximately two days to complete.

The bath treatment model files are saved in the folder An_Camus16vF1\Bath


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4 RESULTS AND CONCLUSIONS

It is recommended that the biomass and treatment amounts are consented at this site asgiven below in Table 7. The results of the modelling performed at this site are given in thefile: ‘An_Camus16vF1_ marine_sum_v3.xls’ in the An_Camus16vF1 folder.

BENTHIC MODELLING:

Max fish biomass proposed (T) 1,471

Cage depth (m) 12Max Average Stocking Density (kg/m³) 15.4

Maximum number of cages 10

loss of solids from model grid (%) 20

Cage area equivalent (m²) 32,135Flux in the cage area (g/m²/y) 11,091

ITI in the cage area 3.4

Flux under cages exceeds the trigger value

80% solids area (m²) 57,281

Flux in the 80% solids area (g/m²/y) 1,484ITI in the 80% solids area 10.4

Benthic sampling area (m²) 72,280.3

Flux in the benthic sampling area (g/m²/y) 191.8ITI in benthic sampling area 30

SITE SPECIFIC SAMPLING:

Transect start coordinates 82350, 817472

Direction ( T) 307.6

CD Depth (m) 21.6

Distance to the 30ITI contour (m) 76.2

SPARE TRANSECT INFORMATION

Transect start coordinates 82681, 817404

Direction ( T) 59.3

CD Depth (m) 22.6

Distance to the 30ITI contour (m) 35

IN-FEED TREATMENTS

Peak fish biomass at site (T) 1,471

Near Field AZE (m²) 49,889

Far Field AZE (m²) 144,904

Recommended consent mass EmBZ (g) 2,574.25

Equivalent Fish Biomass (T) 7,355

Maximum Treatment Amount EmBZ (g) 515

Area of Impact at Far Field EQS (m²) 88,730loss of EmBZ from model grid (%) 17.5


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BATH TREATMENTSRecommended consent mass in 3hrs

Azamethiphos242.2g cage/treatment,

2.3 treatment/day

Recommended consent mass in 24 hrsAzamethiphos

619.5g cage/treatment, 6 treatment/day

Recommended consent mass in 3 hrsCypermethrin

43.9g cages/treatment8.5 treatment/day

Recommended consent mass in 3 hrsDeltamethrin

16.4g cages/treatment8 treatment/day

Table 7 Modelling Results Summarised


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REFERENCES

SEPA 2005. Regulation and monitoring of marine cage fish farming in Scotland - aprocedures manual: Annex G – Models for assessing the use of medicines in bathtreatments (January 2007).

SEPA, 2005. Regulation and monitoring of marine cage fish farming in Scotland - aprocedures manual: Annex H - Methods for Modelling In-Feed Anti-Parasitics and BenthicEffects (June 2005)

SEPA, 2005. Regulation and monitoring of marine cage fish farming in Scotland - aprocedures manual: Attachment VIII – Hydrographic data requirements for applications todischarge from Marine Cage Fish Farm (May 2005).

UKHO, 2002. Admiralty Tide Tables; volume 1 UK and Ireland. United KingdomHydrographic Office, Taunton.

An Camus , Loch Boisdale · 2017. 7. 20. · An Camus , Loch Boisdale AUTODEPOMOD MODELLING REPORT...

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