An approach to prediction of ephemeral gully location and length in conditions of the Czech Republic
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Josef Krasa/Miroslav Dumbrovsk箪, Brno University of Technology, Czech Republic Global Symposium on Soil Erosion (GSER19), 15 - 17 May 2019 at FAO HQ.
An approach to prediction of ephemeral gully location and length in conditions of the Czech Republic
- 1. Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring Josef Krasa, Marketa Bacova, Tomas Dostal, Petr Kavka
- 2. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring Nationwide monitoring The research was supported by project No. QK1720289 Development of automated tools for optimizing monitoring erosion of agricultural land using remote sensing methods, by project No. QK1920224 Possibilities of anti-erosion protection on farms to avoid the use of glyphosate, and by TA R project No. TJ01000270 Atlas HYDROLOGIE a modern tool for hydrological and hydro technical design of soil erosion measures.
- 3. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring sediment traps, pins, plot studies, etc - only experimental sites Any field? Photogrammetry - Stereophotogrammetry + SfM (aerial, UAV based, handheld) - LiDAR (laserscan) - Manually (chains, pinmeters) Peter et al. (2014) St旦cker et al. (2015) Glendell et al. (2017)
- 4. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring DEMs with ca 1mm res. Problems with rill edge definitions.
- 5. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring DOI: 10.1080/22797254.2018.1543556 1. Method developed 2. Scripted (python/ArcGIS) 3. Made available online
- 6. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring Postupice CASE STUDY
- 7. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring
- 8. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring
- 9. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring
- 10. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring
- 11. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring Different DSM detail for different UAV elevations Representative squares
- 12. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring
- 13. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring 2017/08/11 Lbos鱈n (CZ) Field size 28 ha Estimated rill volume 3300 m3
- 14. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring 2017/08/11 Lbos鱈n (CZ) Field size 28 ha Estimated rill volume 3300 m3 UAV height - 113 m
- 15. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring 2017/08/11 Lbos鱈n (CZ) Field size 28 ha Estimated rill volume 3300 m3 UAV height - 30 m UAV height - 113 m
- 16. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring 2017/08/11 Lbos鱈n (CZ) Field size 28 ha Estimated rill volume 3300 m3 UAV height - 113 m UAV height - 30 m
- 17. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring 2017/08/11 Lbos鱈n (CZ) Field size 28 ha Estimated rill volume 3300 m3
- 18. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring 2017/08/11 Lbos鱈n (CZ) Field size 28 ha Estimated rill volume 3300 m3
- 19. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring Conclusions
- 20. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring Conclusions UAVs are most suitable for small to medium scale monitoring. Resolution is sufficient for estimating the volume of eroded material from rills over larger areas. Measured rill volumes indicate that typically used models (e.g. USLE) can heavily underestimate soil losses and field destructions caused by erosion events. Depositions cannot be easily quantified.
- 21. josef.krasa@fsv.cvut.cz Possibilities and precision of volumetric analyses of ephemeral gullies via UAV monitoring Thank you for your attention! The research was supported by project No. QK1720289 Development of automated tools for optimizing monitoring erosion of agricultural land using remote sensing methods, by project No. QK1920224 Possibilities of anti-erosion protection on farms to avoid the use of glyphosate, and by TA R project No. TJ01000270 Atlas HYDROLOGIE a modern tool for hydrological and hydro technical design of soil erosion measures. illustration - sheet, rill, and gully erosion and sediment flow, central Bohemia, 08/2017 息 Josef Kr叩sa