Within high-mountains of Julian Alps and also elsewhere in high-mountains under steep slopes and rock wals occurring of screes is high. These are presenting the range of rubble, that is spreading to lower lying parts with the help of sedimentary gravitational flows. Scree deposit under the west Mangart wall is product of recent activity, which means that with help of different slope processes it is actively produced and changes from day to day. Rubble is produced by physical erosion of Mangart wall and then deposited downward the slope in the shape of tallus slope. Scree under the west Mangart wal is 15.93 hectares large, with four recent fans on it. The fan, that was object of researches for my diploma thesis is 4.137 m2 large and is second fan in a row, observed form direction of north towards south. Her working name is RP1. The aim of the thesis was to determinate the direction and mode of transport flow. I finished the analysis of the orientation of the clasts for 11 points on fan RP1. At each point was, on field, defined a specific area in size of 1x1m and within this area I measured incursion of 52 clasts. Data of incursion was analysed with the help of program Stereo32 and so I got the main direction of flow in each point. Information of their own values S1 and S3 were applied on Dowdeswell diagram which helped to determinate type of gravitational flows affect the formation of fan. On field I also took pictures of analyzed points, under the right angle, and 6 points that qualify were further analyzed. With program ArcGIS I digitized al clasts on each photography to get the information of their surface area. Results of field measurements and cabinet work showed that orientation of clasts on fan equaled main direction of transport, thus against west, that equals direction of falin of slope. Sedimentary gravitational flows influenced motion of rubbler down the slope, but it was not possible to defined them more specificaly.
|
