A potential engineering solution to facilitate upstream movement of fish in mountain rivers with weirs: Southern Carpathians, the Azuga River A potential engineering solution to facilitate upstream movement of fish in mountain rivers with weirs: Southern Carpathians, the Azuga River

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Vol17 No.3: 501-515

Title】A potential engineering solution to facilitate upstream movement of fish in mountain rivers with weirs: Southern Carpathians, the Azuga River

Author】Răzvan VOICU1, Arthur RADECKI-PAWLIK2, Tomasz TYMIŃSKI3, Marian MOKWA3, Robbin SOTIR4, Liliana VOICU1*

Addresses】1 Ecohidrology and Water Quality Protection Service, National Institute of Hydrology and Water Management, Bucharest 013686, Romania; 2 Division of Structural Mechanics and Material Mechanics, Faculty of Civil Engineering, Cracow University of Technology, Krakow 31-155, Poland; 3 Institute of Environmental Engineering, Wrocław University of Environmental and Life Sciences, Wrocław 50-363, Poland; 4 Robbin Sotir & Associates, Inc. 3602 Ernest W. Barrett Parkway Marietta, Georgia 30064-2732, USA

Corresponding author】Liliana VOICU

Citation】Voicu R, Radecki-Pawlik A, TymińskiT, et al. (2020) A potential engineering solution to facilitate upstream movement of fish in mountain rivers with weirs: Southern Carpathians, the Azuga River. Journal of Mountain Science 17(3). https://doi.org/10.1007/s11629-019-5572-y

DOI】https://doi.org/10.1007/s11629-019-5572-y

Abstract】An important aspect in the restoration of longitudinal connectivity in rivers and streams is the implementation of fish migration systems at the upstream of the functional hydraulic structures (weirs, drop structures or river sills). The diversity of these existing structures as well as the different locations of these weirs within the river, watershed and riparian zone challenge the design engineers to find new holistic solutions for fish migration systems. The Azuga River study area requires a new synergistic fish migration design system. Being a mountain area, rapid increase in water level is quite frequent, especially after heavy or prolonged rainfalls and during springsnow melt. Therefore, it is necessary to design a specific system for fish migration to meet this location's requirements. Due to the characteristics in this location of the Azuga river, the classic fish migration systems would not be functional. The indigenous/mountain trout is considered as the target species in this paper. Although this is a good swimming species, the use of classical systems could, due to exhaustion, prevent and/or reduce the movement of fish upstream of the two weirs (also known as river sills). This new, comprehensive solution, presented in this paper includes: (i) the restoration and stabilization works of the right bank in the weir study area by using biotechnical measures and (ii) the upstream migration system itself - for supporting the migration of fish on the Azuga River.

Keywords】Weir; Fish migration system; Brown trout; Mountain river; Soil bioengineering; Connectivity