Fish passages in small stream management

technics technologies education management

Fish passages in small stream management Vojislav Djekovic, Ljubomir Letic, Grozdana Gajic, Aleksandar Andjelkovic, Milorad Janic, Dragomir Grujovic, Nedjo Milosevic

Abstract ral materials are presented with special emphasis

(Anguilla vulgaris)

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The proposed technical solutions promoted the migration of aquatic organisms during the periods of low water level. The water was concentrated to depth for unobstructed movement of aquatic organ-

of some organisms in the streams is the indication designed in the river Ribnica in the drainage basin of the river Koluba-

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Key words:

resources and do not disturb the natural ambiance. -

Introduction Transverse structures are designed and in-

Materials and Methods stream regulation works in the river Ribnica in the

are installed to impound water and to control sediment transport [1]. impedes normal movement of aquatic organisms

as well as on long-term observations and measurements after the construction. The design solution is based on the constructed

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movement to spawning grounds must be provided should be inserted through the dams to allow free along this aquatic route. 4

Volume 8 / Number 1 / 2013


with the environment and does not disturb normal follows: cation and contributes to the conservation of the The aim of the design calculations and models its functions: – – –

Q hp

Q= hp

V0

V0

3 -1

·s

-1

where: –area of water cross section in front of the 2

– – Formation of intake structures. The river Mileševka –A

-

3

·s-1 -

-

g–gravitational acceleration g - 9.81 m ·s-1 hk m b b

m3·s-1

above calculation. Figure 1. Fishway in the river Mileševka (Photo:

(Bernoulli equation) -


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technics technologies education management 1%

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This calculation determines the water cushion -

because the inlet structure was built in hard bedspillwater impact. ;

, com-

where: The river Ribnica is in the drainage basin of the river Kolubara. The dam was designed within -

mean value

which enabled the concentration of small water Froude number in the narrow section (Frs):

regulation and the new reach in the downstream sector. The existing urban regulation ends with a

depth of downstream water (narrow section):

was formed downstream in the unstable loose ma-

the stream channel occurred at this natural cascade ences and destruction of the natural channel [8]. To solve this problem and to protect the channel shaped apron - sinusoidal cascade was designed and constructed (Figure 3).In the middle of the cascade . The function of this small channel within the main channel was to provide the con-

length of water cushion tion [5]:

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and to provide the passage of aquatic organisms. The brown trout (Salmo truta morpha fario) Salmonide swim water level presents a barrier. The streambed protection consists of bed and slope lining with stone

It can be concluded that in the period of peak 6

cross section is designed for Q1% = 150 m3·s-1 . Volume 8 / Number 1 / 2013


Figure 2. Cross section of the river Ribnica improved channel (Source: original) The dam in this section of the improved chansill. Sloping and S-shaped apron cascades are the dams in the improved stream channel which solve -

cascade is solved with two curves. One of them is

-1

transition from double to single channel is pre-

where:

the channel roughness and increases the stream -

(Hoffmann equation) V0 cades (m·s-1

Figure 3. Section of sinusoidal cascade (Source: original)

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with the coordinates of the end point of the circular curve:

we shall present some general conclusions:

The circular part of the curve continues with a

(Rehbock equation) Volume 8 / Number 1 / 2013

river Ribnica (Source: original) 7


1.The analysis ofhydraulic jump:

(Bernoulli equation) Figure 5. Cross-section of S-shaped cascade with V1 V2

-1 s

2

s

downstream of S-shaped cascade:

The procedure of gradual approximation leads to: maximum discharge (Source: original) H (water depth)

A

B A3/ B width)

in the upstream section compared to downstream section is:

hkr 2.15

2382.32

The calculation of normal depth for uniform equals:

(Bernoulli equation) The procedure of gradual approximation leads to: downstream channel (Source: original) H (water depth)

A(m 2)

36.12 39.38

h

the O AR2/3 (wet volume)

.

-

22.39 56.23

h=hs 1.19 m. 3

the maximal design discharge Q=150 m ·s cause h 25

16 15

12 13

(Source: original) Period

Fish sizes (cm) 10-15 2 2

1 2 10



two to three times per month The Tables present the mean values.

these solutions a special value. The measurement 2

the conditions for stream aeration and self-puriming upstream. Salmonidae, and their spawning occurs over the -

migrate to shallow water in the upstream parts. References

Conclusion

1. Ead SA, Rajaratnam N, and Katopodis C, Generalized study of Hydraulics of Culvert Fishways, J. Hydraul. Eng., 2002; 128: Issues 1, 1018–1022.

Salmonidae

2. Cotel AJ, Webb PW, and Tritico H, Do brown trout choose locations with reduced turbulence? Trans. Am. Fisheries Soc., 2006; 135: Issues 3, 610–619. 3. Faculty of Forestry Belgrade, 2007; ISBN 978-867299-131-4, 1-205.

servation of ecological functions of these water

compatible with the natural environment. In the nel cut in the bottom of the cascades enables the concentration of small and medium water and creates the conditions for undisturbed movement of

gabion mattresses and stone prism in order to inters. This paper presents the complete calculations which are of practical value. -

constant washing and water concentration in the

4. Schilt CR, Developing Fish Passage and Protection at Hydropower Dams, Applied Animal Behaviour Science, 2007; 104: Issues 3-4, 295-325. 5.

droenergy Potentials of Yugoslavia, Method of Utilisation of the Existing and Planning of Future Hydroelectric Power Stations, 2nd Symposium on Energetics in Yugoslavia, SANU, Belgrade, 1970; 1-150.

6. Kim JH, Hydraulic Characteristics by Weir Type in a Pool-Weir Fishway, Ecol. Eng., 2001; 16: Issues 3, 425–433. 7. Reynolds AJ, Turbulent Flows in Engineering, John Wiley, New York, 1974; 1-33. 8. Pavlov DS, Lupandin AI, and Skorobogatov MA, The Critical Swimming Speed of Gudgeon (Gobio-Gobio), Doklady Akademii Nauk, 1994; 336: Issues 1, 138–141. 9. Rodriguez TT, Agudo JP, Mosquera LP, and Gonzalez EP, Evaluating Vertical-slot Fishway Designs in Terms of Fish Swimming Capabilities, Ecol. Eng., 2006; 27: Issues 1, 37–48. 10.

sity Textbook, Faculty of Forestry Belgrade, 1997; ISBN 86-7290-045-5, 1-265.


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11. for estimation of volitional rainbow trout density, Trans. Am. Fisheries Soc., 2006; 135: Issues 2, 431–441. 12. Zlámalová GH, Vávrová M, And Korínek P, Assessment of contamination of water included into feed rations, Friezing, Germany, 2002; 108–113. 13. mountain area of Serbia, international symposium, The forestry congress in Serbia, 2010; 1066-1074.

Corresponding Author Nedjo Milosevic, Faculty of Forestry, Belgrade University, Belgrade, Serbia, E-mail: [email protected]

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