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Science Manual – Using Video Images for Fisheries Monitoring 45

A1.2 Larinier pass

A) If the pass is equal to or less than 900 mm wide, one camera chamber is

required (Figure 23). The light panel can be mounted in either a bed or side

recess and a polypropylene board mounted in the other recess:

Stop log grooves

Recess for lighting/polypropylene boards

Camera channel

Baffle section

Flow

620mm

Downslope in this area

(optional, but preferable)

Figure 23: Plan view of counting arrangement on Larinier pass up to 900 mm

Side recess

See general specification (Figure ). If to be fitted on a slope, a 30 mm deep recess

running the length of the slope and extending to a height at least equivalent to Q10,

with a white polypropylene sheet cut to fit and bolted in place, is ideal.

Fixing the light panel

Light panels to be fixed down by attaching counter-sunk (at bottom edge) flanges to

the Perspex sheets. Using coach bolts with the head on the river side will mean that

no turbulence will ensue from the bolts. Some form of fixing will be needed over the

Perspex sheet slots to ensure that they cannot ride up, and this could be something

that covers the top of the camera slot. This means that the light board shape remains

standard and simple, and it is a simple approach easily fabricated.

Bed recess location

Down slope. Fish behaviour is likely to be more predictable on the down slope of a

pass than on the level with slower water. But logistically, it can be more difficult to

locate a light panel on a down slope and the dimensions can be restrictive. The

lighting panel can be an adjustable length, perhaps down to 300 mm where the head

of the pass is severely restrained.

Camera channel

Camera channel to be installed central to the bed recess and centrally opposite the

side recess (Figure 23). See general specification for details.

Camera mount

See general specification.

Stop log grooves

Stop log grooves (100 mm x 100 mm) situated on either side of the lighting to allow

isolation of lighting panels and camera chamber for work and maintenance (Figure

23).

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Radiant DVMD1 Manual de usuario Pagina 53