Solution to ichthyofauna migration razvan voicu-2013

Solutions to ichthyofauna migration upstream – downstream of the discharge sill in

the neighborhood of Dacia Bridge, the city of Oradea

Ph.d Răzvan Voicu

[email protected], [email protected],

Solution I

There are lots of discharge sills in the town of Oradea, namely: Centre Hall, CFR

bridge, Dacia Bridge etc., that inhibit migration of ichthyofauna. Through this study, I

propose two solutions to ichthyofauna migration upstream – downstream of the discharge

sill in the neighborhood of Dacia Bridge (fig.1).

first buttress second buttress left bank abutment

discharge sill first sluiceway second sluiceway

the Crişul Repede River

Figure 1 Discharge sill in the neighborhood of Dacia Bridge

The first solution to ichthyofauna migration upstream – downstream of the Crişul

Repede River is to build a parallelepiped rectangular metallic basin provided with a side

canal(fig. 2).

side canal

mobile basin

Figure 2 Positioning rectangular parallelepiped provided with a side canal-

indicative scheme

The dimensions of the basin that captures ichthyofauna downstream of the

discharge sill are calculated based on the water level downstream of the discharge sill.

Apart from the horizontal surface on a higher plane (metal grid), all other surfaces that

form the rectangular parallelepiped are compact surfaces (fig.3).

basin for ichthyofauna migration

Figure 3 Positioning the basin for ichthyofauna migration- indicative scheme

The basin for ichthyofauna migration is provided with a loophole in the vertical

surface and than a rectangular canal (fig. 4).

canal

Figure 4 Loophole in the vertical surface- indicative scheme

Three areas of the basin are equipped with automatic opening and closing

windows allowing the ichthyofauna entering this basin (fig.5).

windows allowing the ichthyofauna entering this basin

Figure 5 Position of the window for ichthyofauna entering the basin- indicative scheme

On the outside, the mobile basin is equipped with two telescopic hydraulic

cylinders so that the basin can be lifted above the discharge sill (fig.6).

ichthyofauna basin


discharge sill

telescopic hydraulic cylinders

Figure 6 Position of the telescopic hydraulic cylinders - indicative scheme

In order for the ichthyofauna in the mobile basin to migrate above the discharge

sill in the neighborhood of Dacia Bridge, a rectangular channel for ichthyofauna

migration must be fixed to the discharge sill using metal hinges (fig.7).

the Crişul Repede River metal hinges

rectangular canal

discharge sill

telescopic hydraulic cylinder


Figure 7 Fixing the rectangular canal for ichthyofauna migration using metal hinges-

indicative scheme

At the end of the rectangular canal where no metal hinges are provided, a bearing

and a telescopic hydraulic cylinder are fixed by two metal bars (fig. 8).

bearing

rectangular canal

bearing

metal bar

discharge sill telescopic hydraulic cylinder

Figure 8 Fixing telescopic hydraulic cylinder- indicative scheme

The rectangular canal reaches the Crişul Repede River downstream of the

discharge sill, being able to undertake the ichthyofauna coming down. But this channel is

designed specifically to undertake the ichthyofauna in the rectangular basin (fig.9). One

of telescopic hydraulic cylinders has a higher lifting degree than the other so that the

mobile basin will slide to the loophole built into one of the vertical surfaces of the mobile

basin. In the top of the other telescopic hydraulic cylinder is an metal spiral arc for the

movement of the ichthyofauna basin. The loophole is provided with a window that opens

automatically when the second telescopic hydraulic cylinder reaches the maximum point.

All ichthyofauna will be taken by the rectangular canal provided with metal hinges.

ichthyofauna basin


discharge sill

The Crişul Repede River



metal hinges

Figure 9 The general scheme of the ichthyofauna migration system- indicative scheme

According to the (fig.9), the connection between the canal of the mobile basin for

ichthyofauna migration and the rectangular canal fixed on the discharge sill is perfect due

to mobility of the two canals. The slope between the two channels is required by the

migratory fish species but, is generally the local slope of the Crişul Repede River. The

solution can be successfully applied anywhere in the world.

Solution II

Another possibility for the migratory ichthyofauna in the Crişul Repede River to

cross the discharge sill upstream – downstream is to create a sliding winch system. Two

cables are passed over the winchs supporting two basing on both sides of the discharge

sill in the neighborhood of Dacia Bridge (fig.1).

basin B2 for ichthyofauna

metal cable winchs

basin B1 for ichthyofauna

semicircular tubes supporting

the basin B1 for ichthyofauna


discharge sill

metal bar supporting the basin B1 for ichthyofauna


Figure 1 Supporting the basins on both sides of the discharge sill- indicative scheme

The basins B1 and B2 are attached to the bars by means of some semicircular

tubes sliding on these bars(fig.2).


semicircular tube welding

metal bar

Figure 2 System fixing the metal bar supporting the basin B1for ichthyofauna to the

discharge sill- indicative scheme

The basin B1 is fixed to the two support bars by the means of two other metal

bars welded to four semicircular tubes (fig 3).

basin B1 for ichthyofauna migration

semicircular tube

metal bars supporting the basin B1

system fixing the ichthyofauna basin B1 to the metal bar

Figure 3 System fixing the ichthyofauna basin B1 to the metal bars by the means of

some semicircular tubes - indicative scheme

The same fixing system is used for basin B2 except that the fixing system

connecting the metal bar to the basin B2 is made of two horizontal bars (fig. 4).

metal bars supporting the basin B2

the basin B2

semicircular tube

fixing system connecting the metal bar to the basin B2 for ichthyofauna

Figure 4 Fixing system connecting the basin B2 to the metal bars by the means of the

semicircular tubes- indicative scheme

The basin B2 is also fixed to two telescopic hydraulic cylinders designed to lift

the basin B2 above the discharge sill in the neighborhood of Dacia Bridge (fig.5).

semicircular tube the basin B2

discharge sill



Figure 5 Fixing the basin B2 to the telescopic hydraulic cylinders- indicative scheme

A metal pile provided with hinges at the bottom is attached to the surface near the

discharge sill on the basin B2 (fig.6).

basin B2

metal pile

metal hinges

electric motor


discharge sill the Crişul Repede River


Figure 6 Position the metal pile and electric motor positioning- indicative scheme

When the basin reaches the maximum level, an electric motor attached to a

surface of the basin B2 opens the pile that reaches the Crişul Repede River. When the

metal pile has been folded completely and being parallel to the discharge sill, then the

window for ichthyofauna access can be folded vertically (fig.7). Thus all the

ichthyofauna in the basin B2 goes downstream of the discharge sill. The access window

for ichthyofauna is situated between the two pulleys. During this time, the basin B1 sinks

into the Crişul Repede River because the two basins are connected by some metal wires.

basin B2

window for ichthyofauna discharge


electric motor

metal hinges



Figure 7 Water discharge system from the basin B2- indicative scheme

Thus all the ichthyofauna in the basin B2 goes downstream of the discharge sill.

The access window for ichthyofauna is situated between the two winchs. During this

time, the basin B1 sinks into the Crişul Repede River because the two basins are

connected by some metal wires.In order to help ichthyofauna go upstream the discharge

sill we use the mobile basin B1. Being fixed to the basin B2 by metal cables, the basin B1

will slide on the metal bars when the basin B2 sinks totally into the Crişul Repede River

(fig.8). Due to the electric motor attached to the first buttress, the telescopic hydraulic

cylinders fold until they reach the minimum level (fig. 8). When the telescopic hydraulic

cylinders reach the minimum level, the basin B1 reaches the maximum level.

winchs

basin B1

access window for ichthyofauna

basin B2




Figure 8 The maximum level of the basin B1- indicative scheme

windows for ichthyofauna access

basin B1


electric motor



Figure 9 Positioning the electric motor- indicative scheme

On similar terms, the basin B1 is provided with a metal pile redirecting the

ichthyofauna and also with a window for ichthyofauna discharge. Both are driven by an

electric motor attached to the basin B1 (fig.9). Both B1 and B2 mobile basins are

provided with some windows for ichthyofauna access, other than for ichthyofauna

discharge. Ichthyofauna is guided towards both basins B1 and B2 by the means of some

electromagnetic field generators set in the ground or on floating systems (fig. 10).

These generators will operate separately depending on the period of ichthyofauna

migration. When the basin B1 automatically moves, the generators of the basin B2 switch

off, and when the basin B2 automatically moves, the generators for the basin B1 switch

off. When there is no migration, the two basins will remain steady into the Crişul Repede

River. If there is no more ithtiofauna left, the whole system can be disassembled and

reassembled, then and can be also used for other discharge sills successfully.

.


electromagnetic field generators


metal grid

B2



electromagnetic field generators

metal grid

discharge sill


Figure 10 Positioning the electromagnetic field generators- indicative scheme

A generator using the energy provided from the Crişul Repede River can be

arranged on the discharge sill so that if operating a system for ithtiofauna migration less

power from other sources to be consumed. In order to stop the migratory species crossing

the discharge sill without reaching the basin B2, a metal grid shall be fixed on the edge of

the discharge sill (upstream) (fig.10). When migrating, the fish will gather in front of the

metal grid and, therefore, the basin B2 will catch as many fish as possible so that the

migration process can be carried out normally. The solution can be successfully applied

anywhere in the world.

Engineering

Solution to ichthyofauna migration razvan voicu-2013