Monitoring of torrential and erosion processes in space and time - the case study of Beli potok in Trenta

Na območju skalnega podora v strugi Belega Potoka (Trenta) smo preverili uporabnost dveh metod daljinskega zaznavanja za spremljanje hudourniških in erozijskih procesov. Območje smo trikrat posneli z uporabo brezpilotnega letalnika, dodatno smo objekt daljše obdobje snemali s kamero za zajem posnetkov časovne serije. Pridobljene podatke smo obdelali v računalniških programih in sicer v Pix4Dmapper, v katerem smo iz zračnih posnetkov ustvarili gosti oblak točk in pravi ortofoto posnetek območja. V programu CloudCompare smo goste oblake točk primerjali med seboj in prikazali razlike med njimi, v programu ArcMap pa smo iz gostih oblakov točk ustvaril digitalni model reliefa. V programu ArcMap smo obdelali tudi posnetke časovne serije in na podlagi obdelanih posnetkov ustvarili graf relativnih premikov štirih skalnih gmot na območju skalnega podora v 12 urnih intervalih. Premike vsake od štirih skalnih gmot smo primerjali s podatki iz vremenske postaje Trenta. Na eni od skalnih gmot smo ugotovili statistično značilen vpliv (p 0,05). Razviti metodologiji spremljanja hudourniških in erozijskih procesov dobro prikazujeta spremembe na območju opazovanega objekta v prostoru in času. Smiselno bi bilo na prikazan način opazovati več pobočnih procesov.We tested the usefulness of two methods of remote sensing for the purpose of monitoring torrential and erosion processes in the area of a rockfall at Beli Potok near Trenta. The area was recorded three times using an unmanned aerial vehicle in conjunction with a timelapse camera that recorded the area for a longer period of time. Collected data was then processed with computer programmes Pix4Dmapper, which was used to create a point cloud and ortophoto image of the area based on the aerial footage. CloudCompare was used to compare the point clouds and display the differences while ArcMap was used to to create digital surface models. ArcMap was also used to process time lapse footage and in turn create a graph displaying relative movements of four boulders in the area of the rockfall in 12 hour intervals. Movements of the selected boulders were then correlated with the data obtained form the Trenta weather station. Our results showed, that the movement of one of the boulders was significantly (p 0,05) influence on the other three boulders. The developed methodologies of monitoring were able to show changes on the surface of the rockfall in both time and space. Both of the methods could be applied for monitoring a wider range of erosion processes