20.500.12556/RUL-68424 Ocena magnitud drobirskih tokov v izbranih hudourniških območjih v Sloveniji Estimation of magnitudes of debris flows in selected torrential watersheds in Slovenia V prispevku je opisana uporaba različnih metod za oceno magnitud drobirskih tokov, sproženih ob padavinah, na 18 hudournikih v Zgornjesavski dolini in na dveh na Pohorju (Lobnica, Lobničica). Dodatno preverjanje metod je bilo opravljeno na hudourniških območjih z aktivnimi drobirskimi tokovi v bližnji preteklosti (Predelica, Brusnik). Za nekatere metode zadošča poznavanje morfometričnih lastnosti hudourniškega območja, hudourniške struge in hudourniškega vršaja. Za druge metode je bilo treba uporabiti matematično orodje (HEC-HMS) in izdelati hidrološki model odtoka izbranih padavin, ki lahko sprožijo drobirske tokove. Izračunane magnitude drobirskih tokov se gibljejo v območju od 6500 m3 do 340.000 m3. Vrednosti so odvisne od parametrov hudourniškega območja; najpomembnejši parametri so: površina prispevnega območja, Meltonovo število, naklon vršaja in strmec hudourniške struge. Obravnavane vršaje smo razdelili v tri skupine glede na nevarnost delovanja drobirskih tokov: drobirski vršaji (nevarnost obstaja), hudourniški vršaji (ni nevarnosti) in prehodni vršaji (drobirski tokovi so možni, a malo verjetni). Predlagali smo mejni vrednosti Meltonovega števila (0,3) in naklona hudourniškega vršaja (4° oziroma 7 %) za razdelitev med drobirskimi in hudourniškimi vršaji. Od obravnavanih 24 hudourniških vršajev smo med drobirske vršajev razvrstili 13 vršajev, v hudourniške vršaje pet, ostalih šest vršajev pa smo uvrstili med prehodne vršaje. In this paper the application of different methods for estimation of magnitudes of rainfall-induced debris flows in 18 torrents in the Upper Sava River valley, NW Slovenia, and in 2 torrents in Pohorje, N Slovenia is described. Additional verification of the methods was performed in the torrential watersheds with active debris flows in the recent past (Predelica and Brusnik in the Soca River basin, W Slovenia). For some of the methods, the knowledge of morphometric characteristics of a torrential watershed, torrential channel and torrential fan is enough. For other methods, a mathematical tool (HEC-HMS) had to be applied in order to develop a hydrologic run-off model of precipitation that can trigger debris flows. Computed debris-flow magnitudes were of the order between 6,500 m(3) and 340,000 m(3). Their values are a function of torrential watershed parameters, such as: watershed area, Melton number, fan gradient, and torrential channel gradient. The investigated fans were classified into 3 groups with regard to the debris-flow hazard: debris-flow fans (hazard exists), torrential fans (no hazard), and transitional fans (debris flows are possible, but with low possibility). A limit between debris-flow fans and torrential fans is proposed: Melton number 0.3 and torrential fan gradient 4 degrees, that is, 7%. Out of 24 investigated torrential fans, 13 fans were classified into the group of debris-flow fans, 5 fans were classified into the group of torrential fans, and the rest 6 fans were classified into the group of transitional fans. erozija masna gibanja drobirski tokovi empirični modeli ocena nevarnosti vršaji Zgornjesavska dolina Pohorje Slovenija erosion mass movements debris flows empirical models hazard estimation fans Upper Sava River valley Pohorje Slovenia true false false Anton Melik Geographical Institute Neznan jezik Neznan jezik Delo ni kategorizirano 2015-07-10 21:03:54 2015-07-10 21:03:54 2022-12-27 12:25:33 0000-00-00 00:00:00 2006 0 0 93-110 46 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 1581-6613 10.3986/AGS46104 ags46%2D1%2D4%2DSodnikMikos_str%2D93%2D123.pdf ags46%2D1%2D4%2DSodnikMikos_str%2D93%2D123.pdf 1 AE8B79248CC39586088FCC9B61A18548 5c423d9f1f3a34ce785e8c39b096121efdb576c90b3aacc5cb5a103f0232ecbe 12e3fa30-a1ae-11eb-a523-00155dcfd717 20.500.12556/rul/c71813ef-1285-41ff-a2c3-ef0a4bbc031b https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=85679 Fakulteta za gradbeništvo in geodezijo 0 0 0