Dvodimenzijsko modeliranje gibanja drobirskega toka v Logu pod Mangartom kot primer nenewtonske tekočine

Četina, Matjaž (author), Krzyk, Mario (author)

Z matematičnimi modeli je bilo simulirano gibanje drobirskega toka, ki je nastal po sprožitvi plazu Stože novembra 2000 in razdejal del vasi Log pod Mangartom. Na zgornjem delu vplivnega področja, kjer se je drobirski tok v glavnem gibal po ozkem kanjonu, je bil uporabljen enodimenzijski model DEBRIFID. Za izbrane primere mogočih prihodnjih plazov so bili tako določeni hidrogrami pretokov drobirskega toka na zgornjem koncu ogrožene vasi Log pod Mangartom. Dvodimenzijske simulacije drobirskega toka v vasi so bile narejene z dvema modeloma s PCFLOW2D, ki je bil razvit na FGG Univerze v Ljubljani in stržnim modelom FLO-2D. Vsi trije modeli so bili uspešno umerjeni s terenskimimeritvami dosega plazu, pri čemer so bili upoštevani tudi rezultati geomehanskih laboratorijskih raziskav. Narejena je bila analiza občutljivosti dvodimenzijskega modela PCFLOW 2D na gostoto numerične mreže in različna robnapogoja na iztoku iz področja. Veljavnost kvadratne enačbe , ki izraža trenje pri Binghamovem plastičnem modelu nenewtonske tekočine, je bila potrjena tudi pri spreminjajočem se režimu toka. ...

• Language: Slovenian
• Keywords: debris flow, mathematical models, non-Newtonian fluids, torrent-control, testing
• Work type: Not categorized (r6)
• Tipology: 1.01 - Original Scientific Article
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2003
• Publisher: Association of Mechanical Engineers and Technicians of Slovenia et al.
• Number of pages: str. 161-172
• Numbering: Letn. 49, št. 3
• UDC: 519.87:627.157:627.141(497.4 Log pod Mangartom)
• ISSN on article: 0039-2480
• COBISS.SI-ID: 6250779
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Record is a part of a journal

• Title: Strojniški vestnik
• Shortened title: Stroj. vestn.
• Publisher: Zveza strojnih inženirjev in tehnikov Slovenije [et al.], = Association of Mechanical Engineers and Technicians of Slovenia [et al.]
• ISSN: 0039-2480
• COBISS.SI-ID: 762116

Secondary language

• Language: English
• Title: Two-dimensional modelling of Debris-flow movement in Log pod Mangartom as an example of a non-Newtonian fluid

Abstract

Mathematical models have been used for simulations of the landslide (debris flow) below Stože that occured in November 2000, and destroyed part of the village of Log pod Mangartom. The one-dimensional model, DEBRIFID, was first used for simulations along the upper part of the affected region, where the debris flow was mainly in a narrow canyon. Hydrographs of the debris-flow discharge at the upstream end of the affected village of Log pod Mangartom were thas determined for possible future landslides. Two-dimensional simulations of the debris flow in the village were carried out using two models: PCFLOW2D, developed at the University of Ljubljana, and a commercial model FLO-2D. The three models were succesfuly calibrated using field measurements of the debris-flow inundation limits, taking into account the results of geo-mechanical laboratory experiments. The sensitivity analysis of the two-dimensional model PCFLOW2D with different grid sizes and two different out flow boundary conditions was also made. The validity of the quadratic equation expressing the resistance of the non-Newtonian Bingham plastic fluid model was roughly confirmed, even for changing flow regimes. ...