Numerično modeliranje tokovnih razmer v prehodu za vodne organizme tipa MABA : magistrsko delo

Babij, Lucija (author), Rak, Gašper (mentor), Hatić, Vanja (comentor)

Zaradi potrebe po ponovni vzpostavitvi rečnega kontinuuma, ki je na številnih vodotokih prekinjen zaradi izgradnje vodnogospodarskih objektov, sta pravilno načrtovanje in izvedba PZVO vitalnega pomena za ohranjanje biodiverzitete rečnega in obrečnega okolja. V sklopu naloge smo obravnavali PZVO tipa MABA, ki spada med tehnične tipe prehodov z vertikalnimi režami in se je v preteklosti že izkazal za učinkovito rešitev. V prvi fazi raziskave smo preverili primernost programskega orodja TELEMAC-2D z reprodukcijo delovanja primerljivega PZVO na HE Arto–Blanca, pri čemer smo rezultate numeričnega modela primerjali z razpoložljivimi meritvami. V ta namen smo izdelali globinsko povprečen dvodimenzionalni hidravlični model Blanca. V drugi fazi smo enak pristop uporabili za hidravlično analizo idejne zasnove PZVO tipa MABA. Preučili smo vpliv različnih fizikalnih in numeričnih parametrov na hidravlične značilnosti toka ter ocenili ustreznost zasnove glede na predpisane kriterije. Rezultati so potrdili ugotovitve iz obstoječih študij, da spreminjanje koeficienta hrapavosti ob dnu nima izrazitega vpliva na hidravlične parametre. Nasprotno velja za izbiro računske mreže, ki ima izrazit vpliv na položaj glavnega toka, na simuliranje šibkejših con vrtinčenja, maksimalne hitrosti ter jakost disipacije turbulentne kinetične energije. Z zmanjšanjem pretoka in vzdolžnega naklona se zmanjšajo tudi hitrosti toka in disipacija znotraj prekatov, medtem ko se zmerno zoženje prekatov odrazi pretežno v spremembi tokovne slike. Rezultati hidravlične analize potrjujejo uporabnost modela TELEMAC-2D za analizo tokovnih razmer v PZVO z vertikalnimi režami. Za dokončno validacijo in optimizacijo zasnove pa je še vedno potrebna primerjava z meritvami na fizičnem modelu ali prototipu. Predstavljeni rezultati hkrati predstavljajo pomembno izhodišče za nadaljnje načrtovanje in optimizacijo obravnavanega PZVO.

• Language: Slovenian
• Keywords: magistrska dela, vodarstvo in okoljsko inženirstvo, prehod za vodne organizme (PZVO), ribja steza tipa MABA, 2D numerično modeliranje, model turbulence k - epsilon, TELEMAC-2D
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [L. Babij]
• Year: 2026
• Number of pages: 1 spletni vir (1 datoteka PDF (X, 43 str., [25] str. pril.))
• PID: 20.500.12556/RUL-186468
• UDC: 556.16.047:532.57:519.62(043.2)
• COBISS.SI-ID: 290098435
• Publication date in RUL: 02.09.2026

Secondary language

• Language: English
• Title: Numerical modelling of hydraulic conditions in a MABA-type fish passage : master thesis

Abstract

Given the need to re-establish the river continuum, which has been disrupted on numerous watercourses by the construction of water management structures, proper planning and implementation of river restoration works are vital to conserving biodiversity in river and riparian environments. As part of this project, we examined the MABA-type fish pass, a technical passage with vertical slots that has proven effective in the past. In the first phase of the research, we assessed the suitability of the TELEMAC-2D software tool by simulating the operation of a comparable fish pass at the Arto–Blanca hydroelectric power station and comparing the numerical model results with available measurements. To this end, we developed a depth-averaged two-dimensional hydraulic model of the structure in question. In the second phase, we applied the same approach to the hydraulic analysis of the conceptual design of the MABA‑type AOP. We investigated the influence of various physical and numerical parameters on the flow's hydraulic characteristics and assessed the design's suitability against the prescribed criteria. The results confirmed findings from existing studies that varying the roughness coefficient at the bed has no significant effect on hydraulic parameters. Conversely, the choice of computational grid has a significant influence on the position of the main flow, the simulation of weaker eddy zones, maximum velocities and the rate of dissipation of turbulent kinetic energy. Reducing the flow rate and the longitudinal slope also reduces flow velocities and dissipation within the chambers, whilst a moderate narrowing of the chambers is reflected primarily in a change in the flow pattern. The results of the hydraulic analysis confirm the suitability of the TELEMAC-2D model for analysing flow conditions in a AOP with vertical slots. However, for final validation and optimisation of the design, a comparison with measurements on a physical model or prototype is still required. The results presented also provide an important starting point for the further design and optimisation of the AOP under consideration.

• Keywords: master thesis, hydrologic and environmental engineering, Aquatic Organism Passage (AOP), the MABA-type fish pass, 2D numerical modelling, k - epsilon turbulence model, TELEMAC-2D