Račun vala zaradi morebitne porušitve jezu Melje in dela nasipa na dovodnem kanalu hidroelektrarne Zlatoličje : magistrsko delo

Kete, Andraž (author), Četina, Matjaž (mentor), Novak, Gorazd (comentor)

V drugi polovici 20. stoletja se je zaradi povečane potrebe po električni energiji zgradilo veliko število hidroenergetskih objektov. Ob izgradnji takih objektov je potrebno izvesti presojo vplivov objekta na okolico, za zagotavljanje varnosti prebivalsta in infrastrukture na območju pa je potrebno pripraviti tudi načrt zaščite in reševanja za ogroženo območje v primeru njihove porušitve. Temelj takega načrta je hidravlični izračun morebitne porušitve pregradnih objektov, kakršen je bil izveden tudi v okviru te naloge. V prvem delu naloge so predstavljeni pregradni objekti in vzroki, zaradi katerih lahko pride do njihove porušitve. Sledi pregled teoretičnega ozadja hidravličnih izračunov in zakonodaje, ki ureja področje pregradnih objektov v Sloveniji. Naloga se osredotoča na jez Melje, ki predstavlja del sistema hidroelektrarne Zlatoličje. V tem delu smo izvedli hidravlični izračun morebitne porušitve jezu in v sklopu izdelave izračuna je predstavljen celotni sistem hidroelektrarne, podatki za hidravlični model in uporabljene predpostavke. Ker je za jez Melje že bil izveden izračun porušitvenega vala v sklopu študije Porušitev Dravskih stopenj iz leta 1977 je prikazana še primerjava rezultatov, dobljenih z obema modeloma. Ker se voda pri visokih začetnih pretokih razliva po poplavnih ravnicah, smo v magistrski nalogi izdelali še dvodimenzionalni model področja dolvodno od jezu Melje in dobljene globine in hitrosti primerjali z enodimezionalnim modelom porušitvenega vala. Rezultati kažejo, da bi bila najneugodnejši primer porušitev stebrov med že odprtimi zaponicami pri začetnem pretoku Qmax = 4650 m3/s. Ob bolj verjetnih predpostavkah pa nobena izmed porušitev ne bi resneje ogrozila poseljenih področij na odseku dolvodno med jezom Melje in jezom Markovci.

• Language: Slovenian
• Keywords: VKI, magistrske naloge, pregrade, porušitve pregrad, porušitveni val, HE Zlatoličje, hidravlični modeli, HEC-RAS, 1D modeli, 2D modeli
• 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: [A. Kete]
• Year: 2020
• Number of pages: XII, 99 str.
• PID: 20.500.12556/RUL-113731
• UDC: 626/627:004(497.4)(043.3)
• COBISS.SI-ID: 9109857
• Publication date in RUL: 30.01.2020

KETE, Andraž, 2020, Račun vala zaradi morebitne porušitve jezu Melje in dela nasipa na dovodnem kanalu hidroelektrarne Zlatoličje : magistrsko delo [online]. Master’s thesis. Ljubljana : A. Kete. [Accessed 14 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=113731

Secondary language

• Language: English
• Title: Computation of dam-break wave due to possible failure of dam Melje and part of the embankment on headrace channel of hydropower plant Zlatoličje : master thesis

Abstract

In the second half of the 20th century, due to the increased need for electricity a large number of hydropower facilities has been built. When constructing such facilities, it is necessary to carry out an assessment of the environmental impact of the facility. In order to provide the safety of the population around the infrastructure, a safety plan for the emergency solutions has to be prepared. The basis of such a plan is the hydraulic calculation of the possible dam break of the structures, also presented in our master thesis. The first part of the thesis presents dams and potential causes that could cause a collapse. The following is a review of theoretical background of hydraulics and the legislation governing the field of dams in Slovenia. Theory is then followed by analysis of the Melje dam, which is a part of Zlatoličje hydroelectric power plant. Afterwards, we have performed a hydraulic calculation of a possible dam failure. As a part of the calculation, we have presented the complete system of the hydroelectric power plant, the data of the hydraulic model and all assumptions needed to build the model. Since the Melje dam has already been analysed and the dam break flood wave was already calculated as a part of the 1977 Porušitev Dravskih stopenj project, we have based our model on the assumptions used in aforementioned project. Due to the fact that water spills over flood plains at high flow rates, we have created a two-dimensional model and compared obtained results with a one-dimensional model at high water flow. The results indicate that the worst case scenario would be dam-break of pillars between gates at initial flow of Qmax = 4650 m3/s. Under more reasonable assumptions, none of the dam-breaks would seriously endanger the populated areas on the section between the Melje dam and the Markovci dam.

• Keywords: dams, dam failures, dam break flood wave, Zlatoličje dam, hydraulic models, HEC-RAS, 1D models, 2D models