Matematično modeliranje toka v ribjih stezah z vertikalnimi režami

Bombač, Martin (author), Rak, Gašper (author), Novak, Gorazd (author)

Izgradnja rečnih pregrad pomeni prekinitev nujno potrebnih migracijskih poti za ribe in druge vodne organizme za ohranitev populacij vzdolž vodotokov. Eden izmed omilitvenih ukrepov ob takšnih posegih v rečno telo je izgradnja ribje steze, po kateri vodni organizmi predvsem ob času drsti migrirajo ob sami pregradi. V članku so podrobno prikazani numerični parametri matematičnega modela PCFLOW2D, ki se je ob ustreznih nastavitvah izkazal kot ustrezno orodje za projektiranje ribjih stez z vertikalnimi režami. Prikazana je analiza vpliva geometrijskih in numeričnih parametrov na izračun tokovne slike. Podrobno so prikazane meritve toka v že zgrajeni ribji stezi ob hidroelektrarni Arto-Blanca, na podlagi katerih je bil matematični model validiran. Prikazani so rezultati izračunov za različne vzdolžne padce ribje steze. Poleg največjih hitrosti in pretoka so bili analizirani še drugi pomembni hidravlični parametri, ki vplivajo na prehodnost ribje steze, kot sta hitrostno polje in porazdelitev disipacije turbulentne kinetične energije znotraj posameznega prekata ribje steze.

• Language: Slovenian
• Keywords: matematično modeliranje, ribja steza z vertikalnimi režami, turbulenca, hitrostno polje, disipacija turbulentne kinetične energije, mathematical modeling, vertical slot fishway, turbulence, velocity field, turbulent kinetic energy dissipation
• Work type: Scientific work
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Author Accepted Manuscript
• Year: 2020
• Number of pages: Str. 97-112
• Numbering: Letn. 33, št. 59
• PID: 20.500.12556/RUL-124728
• UDC: 519.673:626.882(497.4)
• ISSN on article: 1581-0267
• DOI: 10.15292/acta.hydro.2020.07
• COBISS.SI-ID: 43463171
• Publication date in RUL: 13.02.2021

Record is a part of a journal

• Title: Acta hydrotechnica
• Shortened title: Acta hydrotech.
• Publisher: Fakulteta za gradbeništvo in geodezijo
• ISSN: 1581-0267
• COBISS.SI-ID: 1838689

Licences

• License: CC BY-NC-SA 4.0, Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Description: A Creative Commons license that bans commercial use and requires the user to release any modified works under this license.
• Licensing start date: 13.02.2021

Secondary language

• Language: English
• Title: Mathematical modeling of flow in vertical slot fishways

Abstract

River dams interrupt essential migration routes of fish and other aquatic organisms. One of the most important mitigation measures that enable aquatic fauna to migrate, especially during spawning, are fishways. The paper presents all the main results of the numerical model PCFLOW2D, which proved to be a useful tool in designing a vertical slot fishway (VSF). The presented analysis includes the quantification of the effect of various numerical and geometrical parameters. Extensive field measurements of flow characteristics in the operating fishway at the hydro power plant Arto-Blanca, which are employed for the model's validation, are discussed as well. The results of simulations for various longitudinal slopes of the VSF are presented. In addition to maximum flow velocities and discharge, other important hydraulic parameters affecting fishway efficiency were analyzed, such as velocity field and distribution of turbulent kinetic energy dissipation.