Fish passage solution! Razvan Voicu

Acta Oecologica Carpatica

Vegetation patterns and land use systems in a traditional cultural landscape ; 79/140 pp. - 1 -

DEVELOPING A SYSTEM FOR FISH FAUNA MIGRATION

ABOVE THE SPILLWAY SILL NEAR THE CITY HALL OF ORADEA

Răzvan VOICU 1 , Liliana VOICU 2

KEYWORDS: ecobiome’s functionality, ecosystem, Crisul Repede River, connectivity,

dynamics of the watercourse

ABSTRACT

In the Oradea town, the watercourse Crisul

Repede underwent morphological alterations with a negative impact on the dynamics of the watercourse. This river is provided with

a lot of spillway sills inside the town and, according to the case study, one of them is

near the centre of the town. The channelled of the river Crisul Repede inside the town

affected biodiversity and implicit the

ecobiome’s functionality on the Crisul Repede River.

Therefore, this article aims to

provide a solution for migration fish fauna, designed to restore longitudinal

connectivity.

REZUMAT:

In orasul Oradea, cursul de apa Crișul Repede a fost supus alterarilor

hidromorfologice cu impact negativ asupra dinamicii cursului de apă. Pe sectorul de râu,

care strabate orașul Oradea se află numeroase praguri deversoare, și potrivit

studiului caz, prezentat in aceasta lucrare,

unul dintre aceste praguri este amplasat

aproape de centrul orașului. Canalizareaa raului Crisul Repede in interiorul orasului

Oradea afectat biodiversitatea locală si implicit funcționalitatea ecobiomului de pe

râul Crișul Repede. Prin urmare, acest

articol isi propune sa prezinte o solutie pentru migrarea ihtiofaunei, menita sa

restabileasca conectivitatea longitudinala.

INTRODUCTION

There are many hydrotechnical facilities along the Crisul Repede River, including spillway sills. In the city of

Oradea there are some sills with the following locations: CFR Bridge, the City

Hall of Oradea, Dacia Bridge etc. These spillway sills seriously affect the connectivity of the Crisul Repede River,

strongly reducing its biodiversity and ecological valence, implicitly. The need for

longitudinal connectivity of watercourses

represents an essential condition for the Water Framework Directive approved by the

European community and, therefore, it should be applied to all streams containing

migratory species. The subject of this case study proposes an ecotechnical solution consisting of the frontal connectivity in the

city of Oradea. The solution proposed for fish fauna migration upstream – downstream

of the spillway sill situated at the City Hall

Acta Oecol. Carpat .

A. Reif, E. Ruşdea, K. Brinkmann, G. Harth, B. Michler, F. Păcurar and I. Rotar - 2 -

of Oradea is practical, it can be developed

without any expensive technology and does

not affect the spillway sill structure and

associated construction.

THE SOLUTION PROPOSED FOR FISH FAUNA MIGRATION

To ease the migration of ichthyofauna above the spillway sill (figure.

1 and figure. 2), a system consisting of four winches provided with waterproof metal cables should be developed. A rubbery

inelastic texture provided with rhombic

space is connected to the cables of the winches. When it is raised, the texture will

hold the fish fauna (figure.3).

Figure 1: Spillway sill near the City Hall of Oradea

Figure 2: Spillway sill near the City Hall of Oradea



metal circles

stainless cable

stainless cable Figure 3: Rubbery inelastic texture provided with rhombic space – indicative scheme

On the edge of the texture there is a metal cable on which four symmetrical metal rings

are welded. (figure. 3). Two metal or concrete pillars are fixed on the Crisul Repede River watercourse on both sides of the spillway sill. (figure. 4).

jagged metal beam

Crisul Repede

River

concrete pillar spillway sill concrete pillar

Crisul Repede River Figure 4: Positioning metal or concrete pillars– indicative scheme



A jagged metal beam is fixed on the two pillars on inclined plane. (figure 4). An electric rack-driven motor is fixed in the

upper side of the jagged metal beam. (figure

5). The metal rectangular housing of the electric motor is fixed on the jagged metal beam by the means of four bearings.

electric motor

jagged wheel

jagged metal beam

electric motor

jagged wheel

metal bars

bearings

jagged metal beam

Figure 5: Attaching the electric motor to the jagged metal beam– indicative scheme

Due to rack that spins the motor goes

up and down on the jagged rail. Both upstream and downstream the maximum distance at which the electric motor can

come close to the two piles is about one

meter. Four winches like those used for

SUVs are attached to the flat edges of the electric motor housing (figure 6 ).



flat edge of the electric motor housing

winch

Figure 6: Positioning of the winch on the electric motor – indicative scheme

Also, on each edge of the motor

housing, a spacer is welded a few inches

below the winch. On the main bar each

spacer is provided with a mobile cylinder helping with the traction (figure 7).

mobile cylinder

main bar of the spacer

metal stops mobile cylinder

main bar of the spacer

flat edge of the electric motor housing

Figure 7: Positioning the spacer– indicative scheme

Spacers help winches and dragging

cables function. Therefore, cables do not interfere with each other and can raise the

rubbery texture provided with rhombic spaces (figure. 8).



concrete pillar

jagged metal beam

spillway sill Crisul Repede River

concrete pillar

rubbery texture provided with rhombic spaces metal cable

winch

electric motor

Figure 8: Positioning the electric motor– indicative scheme

The electric motor is supplied with

electric power from the right bank of the river, the place where the local electricity supply is located (figure 9).



power supply arched cable electric motor

jagged metal beam

Crisul Repede

River

concrete pillar spillway sill concrete pillar

power supply fixed cable

Figure 9: Power supply system of the electric motor– indicative scheme

The motor will be supplied by the means of a fixed cable near the jugged bar.

Then, the fixed cable turns into an arched cable that can be extended up to the spillway sill. Surveillance cameras will be installed

on both banks of the river in order to observe various species of fish gathering

together near the sill, at the rubbery texture. The electric motor and the winches are connected to a computer and thus they can

be activated from tens of kilometres distance by the means of some informational

programs. For migratory fish species to reach the rubbery texture some

electromagnetic fields systems will be set using floating generators obliquely positioned on the spillway sill (figure.10).

The advantage of this solution is the possibility to be applied in almost any area

of the world, it has an average execution cost, low maintenance costs and, in the case of invalidity, the technology already

installed can be transferred to another spillway sill in another area.



jagged metal beam concrete pillar

spillway sill Crisul Repede River

electromagnetic fields generator

Figure 10: Positioning the electromagnetic field generators– indicative scheme

CONCLUSION

This system of fish migration upstream – downstream of the spillway sill

provides longitudinal connectivity of the

Crisul Repede River representing an important issue in the local lotic ecosystem

restoration. The solution proposed in this paper is practical, it can be developed

without any expensive technology and does not affect the spillway sill structure and associated construction.

REFERENCES

ActaOecologica Carpatica

Vegetation patterns and land use systems in a traditional cultural landscape; 79/140 pp. - 9 -

Banarescu, P. Fauna of P.R. R.. Academy Edition, Bucharest ,1964. (in Romanian). Diaconu S., Cursuri de apa. Amenajare, impact, Reabilitare, Editura *H*G*A, Bucuresti, 1999.

AUTHORS:

¹Răzvan VOICU

[email protected] [email protected] I.N.H.G.A., Bucharest

²Liliana VOICU [email protected]

I.N.H.G.A., Bucharest.

.

mailto:[email protected]

Acta Oecol. Carpat. .

C. Costiniuc and G. Davideanu - 10 -

Fish passage solution! Razvan Voicu

Environment

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