Analiza dinamike premeščanja plavin na odseku akumulacije HE Doblar : magistrsko delo

Zimic, Klemen (author), Rusjan, Simon (mentor), Mikoš, Matjaž (comentor)

Zaprojevanje akumulacijskih bazenov hidroelektrarn na alpskih rekah je velik upravljavski problem. Z zaprojevanjem prostornine akumulacije se poleg zmanjševanja koristne prostornine povečuje tudi poplavna nevarnost, nastajajo poškodbe na hidromehanski opremi ter povečujejo s tem povezani stroški, kar zmanjšuje rentabilnost delovanja rečnih hidroelektrarn. Brez učinkovitega upravljanja s sedimenti ne moremo zagotavljati enakih možnosti izkoriščanja naravnega vira za zanamce. V magistrskem delu smo na primeru akumulacijskega bazena hidroelektrarne Doblar analizirali dinamiko premeščanja plavin v dolgem obdobju obratovanja hidroelektrarne. Prvi del je bil namenjen predstavitvi teoretičnega ozadja nastanka, premeščanja in odlaganja sedimentov. Predstavljen je bil proces zapolnjevanja akumulacijskega bazena s sedimenti in s tem povezana problematika. V drugem delu so opisane razmere na izbrani lokaciji akumulacijskega bazena hidroelektrarne Doblar. Opisane so naravne značilnosti izbranega območja, predstavljene hidrološke karakteristike pritokov v akumulacijski bazen in značilnosti hidroenergetskih objektov na reki Soči. Na podlagi geodetskih izmer iz različnih obdobij je predstavljeno spreminjanje geometrije akumulacijskega bazena. Z uporabo novejših geometrijskih izmer je bil narejen dvodimenzionalni hidravlični model, v katerem smo opazovali spreminjanje hitrostnega polja vzdolž akumulacije. S pomočjo zrnavostne sestave sedimentov in hitrostnega polja, izračunanega v dvodimenzionalnem modelu, smo ugotavljali, ali se na določenem delu akumulacije HE Doblar določena frakcija plavin premešča. Nalogo smo zaključili s predlogi za nadaljnji monitoring in upravljanje s sedimenti na odseku akumulacije HE Doblar.

• Language: Slovenian
• Keywords: premeščanje plavin, zaprojevanje akumulacijskega bazena, hidroelektrarna Doblar, Soča, HEC-RAS
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publisher: K. Zimic]
• Year: 2019
• PID: 20.500.12556/RUL-110391
• UDC: 556.53:627.8.09(497.4)(043.3)
• COBISS.SI-ID: 8891489
• Publication date in RUL: 14.09.2019

ZIMIC, Klemen, 2019, Analiza dinamike premeščanja plavin na odseku akumulacije HE Doblar : magistrsko delo [online]. Master’s thesis. K. Zimic. [Accessed 20 June 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=110391

Secondary language

• Language: English
• Title: Analysis of sediment transport in the section of the HPP Doblar reservoir : master thesis

Abstract

The sedimentation (siltation) of hydroelectric power plant reservoirs is a big problem for Alpine rivers. When the reservoir's volume is filled up with sediments the useful volume reduces, while flood hazards increases and hydro-mechanical equipment becomes damaged. The associated costs therefore also are increasing, which reduces the hydroelectric power plant's profitability. Without effective sediment management we cannot provide equal opportunities for exploiting natural resources for our descendants. In the master thesis, we analyzed the dynamics of sediment transport in the section of the hydroelectric power plant Doblar reservoir. The first part was dedicated to the theoretical background of the production, transport and deposition of sediments. We presented the sedimentation process of the reservoir and the related problems. In the second part, the conditions at the chosen area are described, as well as the hydrological characteristics of the tributaries flowing into the reservoir and the characteristics of the hydropower structures on the Soča river. The reservoir's changing geometry was presented based on the geodetic measurements in different periods. A two-dimensional hydraulic model was made with the newest geometric measurements, in which we observed the changes in the velocity field along the reservoir. With the help of the granularometry of the river bed and the velocity field, calculated in the two-dimensional model, we were estimating whether a chosen sediment fraction is being transported in the chosen part of the Doblar HPP's reservoir. The thesis was concluded with the propositions for further monitoring and managing of sediments in the Doblar HPP's reservoir section.

• Keywords: sediment transport, reservoir sedimentation, hydroelectric power plant Doblar, Soča river, HEC-RAS