Prepoznavanje in datiranje drobirskih tokov s pomočjo lesnih branik

Konjar, Matevž (author), Kobal, Milan (mentor), Nagel, Thomas Andrew (comentor)

Drobirski tokovi s sposobnostjo prenašanja večjih količin materiala predstavljajo nevarnost za infrastrukturo in življenja ljudi. Z analizo rasti lesnih branik smo v raziskavi poskušali prepoznati odziv dreves na vpliv treh dogodkov z znanim časom nastanka, na podlagi lastnosti odziva datirati podobne odzive v preteklosti in primerjati odzive različnih drevesnih vrst. Na treh lokacijah smo vzorčili skupno 147 dreves različnih drevesnih vrst (bukev, rdeči bor, veliki in mali jesen, gorski javor, smreka, lipa, navadni oreh, maklen), vključno z referenčnimi vzorci dreves, ki niso bila podvržena delovanju dejavnika. Pri 91 drevesih smo uspešno izdelali drevesne kronologije in z uporabo metode kazalnih let ugotovili leta, ki so glede na rast izstopala. Pri ostalih drevesih (večinoma črnem gabru, lipi in gorskemu javorju) nismo uspeli razbrati branik, oz. so drevesne kronologije močno odstopale od povprečja vzorcev. V analizi rasti za leto, ki je sledilo dogodku, smo šibak odziv na vpliv drobirskih tokov zaznali na lokaciji pod Javorščkom, ne pa tudi v Srpenici in Nikovi. Vrste so se na lokacijah odzvale podobno. Ker smo zaznali odziv le na eni lokaciji, nismo uspeli rekonstruirati dogodkov v preteklosti.

• Language: Slovenian
• Keywords: drobirski tokovi/lesne branike/dendrogeomorfologija/pobočni procesi
• Work type: Bachelor thesis/paper
• Organization: BF - Biotechnical Faculty
• Year: 2019
• PID: 20.500.12556/RUL-106573
• COBISS.SI-ID: 5328550
• Publication date in RUL: 06.03.2019

KONJAR, Matevž, 2019, Prepoznavanje in datiranje drobirskih tokov s pomočjo lesnih branik [online]. Bachelor’s thesis. [Accessed 17 May 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=106573

Secondary language

• Language: English
• Title: Recognition and dating of debris flows with the help of tree rings

Abstract

Debris flows can transport large amounts of material, and therefore present a significant threat to infrastructure and human life. In this research, we used tree ring analyses to quantify the tree response to three debris flow events for which we know the time of origin. Based on the attributes of these response patterns, we tried to date similar responses in the past and compared the patterns among different tree species. Together, we sampled 147 trees across a range of species (beech, Scots pine, common ash, manna ash, sycamore maple, Norway spruce, common walnut, field maple, small-leaved lime, and European hop-hornbeam), including reference samples of trees that were not affected by debris flow activity. For 91 trees, we constructed tree ring chronologies and used pointer-year analysis to identify years that had abnormal growth. For remaining trees (mostly European hop-hornbeam, small-leaved lime and sycamore) we could not easily distinguish their tree rings or their chronologies did not match with the average of other samples. Growth patterns following debris flow events showed a weak response at the Javoršček site, and no clear responses at the other two sites. Tree species responded similarly at the same locations. Due to the lack of a clear response pattern, we were not able to reconstruct past events.

• Keywords: Debris flows/tree rings/dendrogeomorphology/slope processes