Hidravlično modeliranje erozijskih razmer na odseku Hrastnice s predlogom idejne zasnove ureditve po poplavnem dogodku avgusta 2023 : magistrsko delo

Dolenc, Tadej (author), Rusjan, Simon (mentor)

V okviru magistrske naloge, so na primeru hudourniškega vodotoka Hrastnice, tj. pritoka Poljanske Sore v bližini Škofje Loke, analizirane poplavne in erozijske razmere, ki so v času poplavne ujme v avgustu 2023, botrovale k uničujočemu delovanju hudourniških izbruhov na vodna in priobalna zemljišča. Z ozirom na spremenjene hidravlične razmere vzdolž obravnavanega odseka Hrastnice, ki so nastale kot posledica rušilne moči vodnih tokov in spremljajočih procesov rečne oziroma hudourniške erozije v času poplavne ujme, je na podlagi izdelanega 2D hidravličnega modela, sprva podana primerjava pretočnih in poplavnih razmer ob pojavu visokovodnih pretokov za stanje pred in po poplavni ujmi. Hidravlično modeliranje erozijskih razmer pa je bilo izvedeno z nadgrajenim 2D hidravličnim modelom premeščanja sedimentov, z vzpostavitvijo katerega smo poskušali čim bolje simulirati dejanske procese rečne oziroma hudourniške erozije, ki so se na obravnavanem odseku Hrastnice, izkazovali v času poplavne ujme. Dobljene rezultate modeliranja premeščanja sedimentov smo uporabili pri izdelavi kart erozijske nevarnosti ter pri analizi erozijskih procesov v posameznih prečnih profilih vzdolž vodotoka. Dodatno je bil analiziran tudi vpliv izbire sedimentnega robnega pogoja na modelirane procese premeščanja sedimentov oziroma plavin. Na podlagi rezultatov izvedenih hidravličnih simulacij in opravljenih analiz, je v zaključku naloge podana idejna zasnova ureditve odseka Hrastnice, v sklopu katere so predvideni tako ukrepi za izboljšanje poplavne varnosti kakor tudi ukrepi za omilitev spremljajočih procesov rečne oziroma hudourniške erozije na obravnavanem odseku vodotoka.

• Language: Slovenian
• Keywords: magistrska dela, gradbeništvo, hudourniške poplave, erozijski procesi, premeščanje plavin, 2D hidravlično modeliranje, idejna zasnova ureditve
• 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: [T. Dolenc]
• Year: 2025
• Number of pages: 1 spletni vir (12 datotek PDF (122 str. + 11 str. pril.))
• PID: 20.500.12556/RUL-167833
• UDC: 004.414.23:556.166(497.4)(043.2)
• COBISS.SI-ID: 229145603

Note

Fakultetna Prešernova nagrada (2025)

• Publication date in RUL: 14.03.2025

Secondary language

• Language: English
• Title: Hydraulic modeling of erosion conditions on the section of the Hrastnica river with a proposal for a conceptual design of the arrangement after the flood event in August 2023 : master thesis

Abstract

The master’s thesis focuses on the analysis of flood and erosion conditions in the torrential stream Hrastnica, a tributary of the Poljanska Sora near Škofja Loka, which was severely impacted by the catastrophic flood event of August 2023. The floodwaters and accompanying processes of river and torrential erosion caused destructive impacts on watercourses and riparian land. Considering the altered hydraulic conditions along the studied section of Hrastnica, which resulted from the destructive power of water flows and erosion processes during the flood event, a comparative analysis of flow and flood conditions for high-water discharges before and after the flood was conducted using a 2D hydraulic model. The hydraulic modeling of erosion conditions was performed using an enhanced 2D hydraulic sediment transport model, which aimed to closely simulate actual river and torrential erosion processes observed in the Hrastnica during the flood event. The results of sediment transport modeling were used to create erosion hazard maps and to analyze erosion processes in specific cross-sections along the stream. Additionally, the influence of the selected sediment boundary condition on the modeled sediment transport processes was examined. Based on the results of hydraulic simulations and analyses, the thesis concludes with a conceptual design for the arrangement of the Hrastnica section. The proposed measures aim to improve flood safety and mitigate the accompanying processes of river and torrential erosion along the studied stream section.

• Keywords: master thesis, civil engineering, flash floods, erosion, sediment transport, 2D hydraulic modeling, conceptual design of the arrangement