sconser quarry, caol mor€¦ · office tide prediction software total tide was used to determine...

Sconser Quarry, Caol MorAUTODEPOMOD MODELLIN G REPORT

4 .2017

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

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

http:// marineharvest. com

Fish Farm Consent ModellingSconser Quarry 2017 Results

1

CONTENTS

Page

EXECUTIVE SUMMARY 1

1 INTRODUCTION 2

2 MODEL INPUT DETAILS 3

2.1 HYDROGRAPHIC DATA 3

2.2 SITE DETAILS 5

2.3 RUN DETAILS 6

3 MODELLING RESULTS 7

3.1 BIOMASS RESULTS 7

3.1.1 TRANSECT AND SAMPLING STATIONS 8

3.2 IN-FEED TREATMENTS 10

3.2.1 SLICE 10

3.3 BATH MODEL RESULTS 11

4 RESULTS AND CONCLUSIONS 12

REFERENCES 14


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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 bathymetry and cage layout ................................................................................... 6

Figure 4 Benthic impact for run 7, Int-Spring current data .................................................... 7

Figure 5 Location of the selected and spare transects ......................................................... 8

Figure 6 Cross-sections of both the selected and spare transects respectively ................... 9

Figure 7 EmBZ concentrations for run 1 (118 days) .......................................................... 10

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 ................................................................................................. 5

Table 4 Selected and Spare Transect Starting Points ......................................................... 8

Table 5a&b The details of the three selected and spare survey stations respectively .......... 9

Table 6 Modelling Results Summarised ............................................................................ 13


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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 SconserQuarry site, a summary of which is provided in Table 1 below. The report held centrally, andpreviously accredited, by SEPA (AMMR11v02) details modelling methods used.

Table 1 Summary of Results

SITE DETAILS

Site Name: Sconser QuarrySite location: Caol Mor, Skye

Peak biomass (T): 2,500

CAGE DETAILS

Number of cages: 12Cage dimensions: 120m Circumference

Working Depth (m): 12

Cage group configuration: 1(2x6), 80m matrix

HYDROGRAPHIC SUMMARY

Surface CurrentsAverage Speed (m/s) 0.084

Residual Direction 0.064m/s at 321°G

Wind-Influence Slight

Middle CurrentsAverage Speed (m/s) 0.067m/s


Seabed CurrentsAverage Speed (m/s) 0.047m/s


BENTHIC MODELLING

Max fish biomass proposed (T) 2,500t

Max Average Stocking Density (kg/m³) 15.15046

Distance to the 30ITI contour (m) 163

Direction of transect ( T) 320.4

IN-FEED TREATMENTS

Recommended consent mass EmBZ (g) 1,575

Equivalent Fish Biomass (T) 4500

Maximum Treatment Amount EmBZ (g) 829

BATH TREATMENTS

Recommended consent mass in 3hrs Azamethiphos 332.7g cage/treatment, 2.6treatment/day

Recommended consent mass in 24 hrs Azamethiphos 378.2g cage/treatment, 3treatment/day

Recommended consent mass in 3 hrs Cypermethrin60.2g cages/treatment, 9.6

treatments/ day

Recommended consent mass in 3 hrs Deltamethrin22.6g cages/treatment, 9

treatments/ 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 Sconser Quarry site ( Figure 1) to determine EQS-compliant biomass andsea-lice treatment levels for the proposed equipment. Report number AMMR11v02, whichis held centrally 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 168 and 360 respectively. Prior tocommencement of modelling the current data required correction to Grid North and was thuscorrected by 4.25W. 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 predominant current in a northerly direction at each surface-, mid- & seabed -depth. A slight correlation was found between the surface current speeds and the windspeeds ( Figure 2); however a tidal pattern can still be seen. The mean wind speed over thisperiod was 4.52m/s.


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Figure 2 Site current direction frequency from the surface current meter

SURFACE

Mean Speed m/s 0.084

Residual Speed m/s 0.064Residual Parallel m/s 0.059Residual Normal m/s 0.023

Tidal Amplitude Parallel m/s 0.084

Tidal Amplitude Normal m/s 0.055Frequency Peak 321

MIDDLE

Mean Speed m/s 0.067Residual Speed m/s 0.039Frequency Peak 305

BOTTOM

Mean Speed m/s 0.047Residual Speed m/s 0.016Frequency Peak 347

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


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2.2 SITE DETAILS

The proposed site is situated off the shore of Sconser Quarry in the Caol Mor body of wateron Skye. Marine Harvest proposes to install a salmon farm at the site and AutoDepomod andthe 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 strait.

Table 3 Project Information

SITE DETAILS

Site Name: Sconser QuarrySite location: Caol Mor, Skye

Peak biomass (T): 2500Proposed feed load (T/yr): 6387.510

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

CAGE DETAILS

Group location: E176109 N709917Number of cages: 12Cage dimensions: 120m circumference, 80m matrix

Working Depth (m): 12Cage group configuration: 1(2x6)

Cage group orientation (° G): 316.5Cage group distance to shore (km): 0.33

Water depth at site (m): 45

HYDROGRAPHIC DATA

Current meter position: E156262, N832367Depth at deployment position (m): 37.6

Surface bin centre height above bed (m): 33.7Middle bin centre height above bed (m): 26.7Bottom bin centre height above bed (m): 2.7

Duration of record: 15 days: from 28/06/2013 to 13/07/2013Current meter averaging interval: 20 mins

ADDITIONAL DATA

Magnetic correction to grid North: - 4.25Predicted Spring Tide 2.4Predicted Neap Tide 2.1Predicted Spring Tide 2.7

Mean Tidal Level at Site (m): 3.15Closest Standard Port Broadford Bay

Date of Intermediate- Spring Tides: 05/07/2013Date of Intermediate- Neap Tides: 13/07/2013


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2.3 RUN DETAILS

A new project was created in AutoDepomod and named Sconser Quarry. The site and cagedetails provided in Table 3 were entered into the appropriate files and all other data were setto default. The resulting site bathymetry and cage layout is shown in Figure 3. Modelling ofboth the biomass and chemotherapeutants was undertaken following the methods outlined inthe Methods Report AMMR11v02 which is held centrally by SEPA. Details of the modellingresults have been provided in the next section according to SEPA requirements.

Figure 3 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 of15.15046kg/m3, and proposed cage layout, using the model’s auto-distribute biomassfunction. The model did not require to iterate to an EQS-complaint solution as a pass wasachieved at this stocking density and pen volume for the resultant maximum allowablebiomass of 2,500 tonnes.

At this biomass the model predicts the 80% solids area to be 106,860m2 while the flux in thisarea is expected to be 1464g/m2/year. The proposed layout and tonnage results in a benthiccage area of 51,794m2 with a minimum ITI of 3.1 within the area. The flux in the benthic cagegroup area is predicted not to exceed the trigger value (10,000g/m2/year) at 9,215g/m2/year. The benthic sampling area ( ITI = 30) is expected to be 160,948.7m2 while the flux inside thisarea will be 191.8g/m2/year. The plotted AutoDepomod output for the passing Int-Spring run7 is shown in Figure 4. A summary with all of this information can be found in SconserQuarry_marine_sum_v3.xls and in Table 7 of this report.

Figure 4 Benthic impact for run 7, Int-Spring current data

The mass of solids released in run 7 is estimated to be 1,020,816kg with 96% (975,536kg) predicted to remain within the 1km2 modelling grid, thus 4% (42,195kg) of the input load ispredicted to be transported from the model grid as a result of resuspension. Current datarecorded at the site results in a vector average residual of 0.064m/s at 321°G at the surface; Figure 4 shows a tendency for waste to be dispersed away from the cages in a northerlydirection.


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3.1.1 TRANSECT AND SAMPLING STATIONS

Two transect profiles were created ( figure 5) as part of SEPA’s requirements todetermine site-specific sampling locations. The selected and spare transect informationhave been saved to the Sconser Quarry-BcnstFI-S-7_000.xls file located in themapping folder. Details of both transect starting points are provided in Table 4 below. Table 5 describe the location and details of the three selected and spare surveystations. Figure 6 shows the cross-sections of the selected and spare transects, andthe relevant survey stations.

Figure 5 Location of the selected and spare transects

Transect X1 Y1 X2 Y2 Bearing Length Depth

T1 156200 832430 156056 832605 320.4 227.2 42.4

T2 156143 832363 155968 832572 320 272.4 36.1

Table 4 Selected and Spare Transect Starting Points


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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 156102.9 156096.5 156090.1 NGR Easting 156022.8 156016.4 156010

NGR Northing 832548.1 832555.8 832563.5 NGR Northing 832506.3 832514 832521.6

Distance ( m) 153.1 163.1 173.1 Distance (m) 187.3 197.3 207.3

CD depth (m) 38.9 38.5 38 CD depth (m) 32.5 32.1 31.7

Modelled ITI 27 30 33.3 Modelled ITI 27 30 34.5

Table 5a&b The details of the three selected and spare survey stations respectively

Figure 6 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 1.9 times the proposed peak biomass (1,575g & 4,500 tonnes respectively). MarineHarvest have followed SEPA’s guidance and used the maximum feedload for the site in themodel, resulting in a feedload of 6,387T. 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 (73,537m2) was smaller than the predicted far field AZE area188,709m2). The mean concentration of Slice in the near field AZE exceeds the EQS trigger

value of 7.63g/kg by 79.77g/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 7. A furtherrun for 223 days duration was performed to obtain a site residual curve for this biomass.

Figure 7 EmBZ concentrations for run 5 (118 days)

The mass of EmBZ remaining on the bed at the end of run 5 was 1086g. For Slice, in theabsence of resuspension, 95% or 1495.5g 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 ( 5%). The mass of EmBZ lost from the grid ( 79.5g) represents anequivalent area of 0.86km2 if it assumed to distribute evenly at the far field EQSconcentration of 0.763g/kg sediment. This level of export is below the threshold of 922g, which is based on the receiving area being unconstrained.


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3.3 BATH MODEL RESULTS

Cage details are given in section 2. The cage treatment depth used for the bath treatmentswas 1.1m. Using the results from the analysis of the surface current meter data in the shortterm bath treatment model EQS compliance for both Deltamethrin and Cypermethrin at thiscage depth was predicted. EQS compliance for Azamethiphos was predicted at a cage depthof 1.1m.

Cypermethrin & Deltamethrin Results: Cage Treatment Depth = 1.1mPermissible Quantity of Cypermethrin = 60.2g; 9.6 cages/3 hoursPermissible Quantity of Deltamethrin = 22.6g; 9.0 cages/3 hours

Azamethiphos Results: Cage treatment depth = 1.1mPermissible Quantity of Azamethiphos = 332.7g; 2.6 cages/3 hoursPermissible Quantity of Azamethiphos = 378.2g; 3.0 cages/24 hours

The permissible quantities means that full treatment of the 12 pens at the site, would take amaximum of 4 days to treat.

The bath treatment model files are saved in the folder Sconser Quarry\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. The results of the modelling performed at this site are given in the file : ‘SconserQuarry_marine_sum_v3.xls’ in the Sconser Quarry folder.

BENTHIC MODELLING:

Max fish biomass proposed (T) 2500

Cage depth (m) 12Max Average Stocking Density (kg/m³) 15.15046

Maximum number of cages 12

loss of solids from model grid (%) 4

Cage area equivalent (m²) 51,794Flux in the cage area (g/m²/y) 13,042

ITI in the cage area 3.1

Flux under cages does not exceed the trigger value

80% solids area (m²) 106,860

Flux in the 80% solids area (g/m²/y) 1464ITI in the 80% solids area 10.5

Benthic sampling area (m²) 160,949

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

SITE SPECIFIC SAMPLING:

Transect start coordinates 156200.4E 832430.1N

Direction () 320.4

CD Depth (m) 42.4

Distance to the 30ITI contour (m) 163.1

SPARE TRANSECT INFORMATION

Transect start coordinates 156143.2E 832362.8N

Direction () 320

CD Depth (m) 36.1

Distance to the 30ITI contour (m) 197.3

IN-FEED TREATMENTS

Peak fish biomass at site (T) 2500

Near Field AZE (m²) 73,537

Far Field AZE (m²) 188,709

Recommended consent mass EmBZ (g) 1575

Equivalent Fish Biomass (T) 4500

Maximum Treatment Amount EmBZ (g) 350

Area of Impact at Far Field EQS (m2) 862.256loss of EmBZ from model grid (%

5


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BATH TREATMENTSRecommended consent mass in 3hrs

Azamethiphos332.7g cage/treatment, 2.6

treatment/day

Recommended consent mass in 24 hrsAzamethiphos

378.2g cage/treatment, 3treatment/day

Recommended consent mass in 3 hrsCypermethrin

60.2g cages/treatment, 9.6treatments/ day

Recommended consent mass in 3 hrsDeltamethrin

22.6g cages/treatment, 9.0treatments/day

Table 6 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.

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