Assessment of protective effect of forest against rockfall in the vally of river Kokra

Namen diplomske naloge je bil ugotoviti stanje gozda in posameznih gozdnih sestojev ter njihov varovalni učinek pred padajočim kamenjem na cesto Kranj % Zg. Jezersko. Na terenu so bili kartirani skalni izvori in sestoji, ki so bili po metodi NaiS tudi popisani in ovrednoteni. Sestoji so bili na podlagi smernic NaiS, trenutnega stanja in njihovega razvoja po 10 in 50 letih razvrščeni v tri kategorije, glede na nujnost ukrepov. Za vsako kategorijo je bila podana ocena stanja in ukrepi, ki bi jih bilo nujno ali priporočljivo izvesti. Slabo pomlajevanje in nepravilna mešanost drevesnih vrst sta bili glavni pomanjkljivosti sestojev, kjer bi bilo ukrepanje najnujnejše. S programom Rockfor.net je bila na podlagi pridobljenih podatkov izračunana verjetnost prehoda kamenja skozi sestoj. Ugotovili smo, da poleg gostote sestoja, drevesne vrste in povprečnega premera drevesa na prehod kamenja skozi sestoj močno vpliva tudi bližina skalnega izvora in velikost padajočega kamenja. Gozd ne varuje ceste le na dveh odsekih, kjer je skalni izvor preblizu ceste in je velikost kamenja en meter v premeru. Na teh dveh odsekih bi bilo priporočljivo namestiti podajno-lovilno ograjo.The purpose of the thesis was to determine the state of the forest and individual forest stands, and their or. its protective effect against rockfall on the road Kranj - Zg. Jezersko. In the field, were mapped rock sources and stands, witch were inventoried and evaluated with the NaiS method. The stands were based on NaiS guidelines, the current status and their development after 10 and 50 years, divided into three categories according to the necessity of action. For each category, were made an assessment of the situation and the measures which would be necessary or advisable to carry out. Poor regeneration and non-site adapted tree species where the main problems in the stands where the action was urgent. The probability of rocks passing through the stand was calculated with Rockfor.net model based on obtained data. Besides the stand density, tree species, and the average diameter of the trees also the proximity of rockfall sources and the size of the falling rocks were very important for rock trajectories. Existing forest didn\u27t protect two sections of the road, where the rockfall source was too close to the road and the size of the rocks is 1 meter in diameter. In these two sections it would be advisable to install the rockfall protection nets