Planning and Design of the UK s s Largest Acoustic and Light-Based Fish Deterrent System

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1 Plaig ad Desig of the UK s s Largest Acoustic ad Light-Based Fish Deterret System Dr D R Lambert ad Dr J R Nedwell Fish Guidace Systems Swawick,, Southampto, Hampshire, UK Iovative Solutios for Fish Deflectio ad Protectio

2 Itroductio Topics: Pembroke Power Statio The SILAS AFD system Selectio of the Fish Deflectio System

3 Pembroke Power Statio Located i West Wales Part of Milford Have idustrial complex

4 Pembroke B Power Statio 2000 MW CCGT Plat, comprisig five 400 MW ge uits Largest power statio i the UK sice Drax was built i 1986 Uses direct seawater coolig (40 cumecs) Due to be completed later this year

5 Pembroke B Power Statio CW Itake Locatio Power statio located i Pear Gut, small bay feedig Milford Have Uses same itake as origial power statio

6 Pembroke B Power Statio Milford Have located i Pembrokeshire Marie Special Area of Coservatio (SAC) Provides special protectio for marie wildlife Particular cocer for eel, salmoids,, lamprey, but all fish that cotribute to food chai of SAC

7 Objective of System Requiremet to istall Best Available Techology (BAT) Mai guidace is Eviromet Agecy documet Screeig for Itake ad Outfalls: a best practice guide Preferred arragemet for large coastal abstractios: acoustic deterrets + fish recovery & retur Eviromet Agecy also requested strobe lights o experimetal basis to deflect eel

8 SILAS AFD system Move to much bigger systems ad fail-safe requiremet prompted ew MkIII Soud Projector Array (SPA) system based upo tried ad tested trasducer Avoids issues of heat, large equipmet racks, cablig ad moitorig. Redudacy will operate autoomously if comms fail Trasducers idividually addressed by computer at surface over RS 485 iterface, smart projector houses amplifier, sigal geeratio, cotrol electroics, coditio moitorig Soud Projectors icorporate Itese Modulated Lights as stadard Itese Lights

9 MkIII SPA Systems Schematic

10 Cotrol Equipmet comprises MkIII SPA Systems System Cotrol Uit (microprocessor) Touch sesitive scree for operators Power Supply Uits (1 per 12 Soud Projectors) Cotrol Equipmet Reduced size of eclosure Greatly simplified cablig

11 MkIII SPA Systems Cotrol Equipmet Cotrol Uit icorporates sophisticated diagostics Moitors coditio of Soud Projectors Provides alarm i evet of failure Idicates whe projectors require maiteace Ca be moitored remotely (whe iteret access available)

12 MkIII SPA Systems Itake Juctio Box Power ad Commuicatio Juctio Box; high redudacy System coforms to Low Voltage Directive (hot pluggable) Desiged for oshore or offshore CW itakes Coects with up to 6 Soud Projectors Icorporates remotely resettable fuse

13 Desig Cosideratios whe Plaig a Fish Deterret System Desig Cosideratios Locatio of Itake Deploymet of Soud Projectors Hydraulic Coditios Access to uderwater uits for servicig Additioal trasducers for redudacy Remote moitorig

14 Locatio of Itake Screeig at Pembroke based upo usig itake from origial Power Statio 17 ilet gates (oe ot used) Drum screes icorporate a fish retur system, istalled by EIMCO Water Techologies Soud Projectors eeded to be istalled o existig structure

15 Deploymet of Soud Projectors Desig based upo deployig Soud Projectors usig rail system, for easy retrieval Will eable access for maiteace Deploymet carried out by EIMCO

16 Hydraulic Coditios Maximum flow ito itake 40m 3 /s Itake desig based upo maximum itake velocity of 0.3m/s Complies with Screeig Best Practice Guide System based upo assumed flow of 0.3m/s

17 Key Fish Species Key fish species idetified as Atlatic salmo ( (salmo salar) Europea eel ( (aguilla aguilla) Additioal cosideratio: o side- effects o Herrig ( (Clupea haregus) local spawig grouds Grey seals ( (Halichoerus grypus) protected species

18 Sigal Selectio Some key species of fish But also eed to deflect geeral populatio of fish Number of sigals available, coverig hearig for wide rage of fish Sigal selected for Pembroke complex mixture of frequecies to cover geeral fish populatio, high frequecy cutoff to reduce effect o marie mammals

19 Modellig Requiremet Small systems ca be desiged without modellig System of Pembroke system required detailed modellig Achieved by usig proprietary model - Predictive Image Source Model (PrISM( PrISM )

20 PrISM Modellig Objectives, to determie - Optimum locatio for Soud Projectors Optimum umber of Soud Projectors required to scree itake Beefit of added redudacy o performace of system Aalysis of soud field as uweighted soud levels Aalysis of soud field usig dbht metric Impact of tidal variatio Extet of soud field ad possible blockig of bay etrace

21 PrISM Modellig Aalysis of soud field across bay shows local deflectio but miimal uwated impact SPL (db) Edge of mai chael Strog avoidace threshold Salmo Herrig Grey Seal Distace from Itake (m) 500m

22 Pembroke Power Statio Egieerig coclusios Based upo soud field predictio usig db ht approach, for salmo, herrig ad grey seal Deploymet requiremets use 18 existig buttresses Acoustic modellig cofirms requiremet for miimum of 3 Soud Projectors per colum, with additioal projector for redudacy With all projectors operatig estimated soud levels throughout water colum do ot fall below miimum recommeded level of 90dB ht (Salmo salar).

23 Pembroke Power Statio Desig Coclusios Optimum umber of trasducers has bee assessed at 72 Buttress mouted cofiguratio of Soud Projectors Have cosidered differet scearios, with tidal variatios Have assessed impact of failures, or servicig Soud Levels do ot exceed dagerous levels Evirometal impact: soud does ot block (i.e. disturb migratio through) etrace to the bay

24 Summary Largest behavioural system i the UK is beig istalled at Pembroke Power Statio (72 trasducers) System beig istalled based upo ew SILAS techology Desig based upo existig itake structure PrISM acoustic modellig cofirmed optimum umber ad locatio of Soud Projectors..however, largest system i the world (96 trasducers) just istalled i the US!