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GRMP 2018 Bi-annual Review Meeting Peace / High Level Districts - PowerPoint PPT Presentation

Jan 14, 2023 •260 likes •484 views

ALBERTA TRANSPORTATION GRMP 2018 Bi-annual Review Meeting Peace / High Level Districts Highway 2 East Hill Sites Geo-referenced Photos + Historical Sat Imagery Peace River Region - Highway 2 - East Hill Site area directly east of the

  1. ALBERTA TRANSPORTATION GRMP 2018 Bi-annual Review Meeting Peace / High Level Districts Highway 2 East Hill Sites Geo-referenced Photos + Historical Sat Imagery

  2. Peace River Region - Highway 2 - East Hill • Site area directly east of the Town of Peace River • Multiple sites within a 4 km segment of the Highway running along on the south- facing wall of the Heart River Valley. • Widespread and highly active mass wasting processes that include channelized erosion, earth flows, deep and shallow landslides within colluvium and glaciolacustrine sediments (Glacial Lake Matthews). 2

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  4. N HWY 2 Peace River Heart River v 4

  5. CHALLENGES • Large site with many active, ongoing and interacting processes • Many of the geohazards do not directly impact the highway but could N lead to future instability or retrogressive processes that are cheaper / more practical to mitigate earlier (i.e. proactive approach) • Limited time on ground during annual inspections – important to establish what are the existing conditions, what has changed and setup consistent framework of comparison to make efficient use of time on site. • Large processes that can be difficult to interpret or understand broader site implications from the ground  LiDAR and aerial imagery tools can help • Annual viewing of site (or limited instrumentation) – difficult to establish timeline or evaluate rate of geohazard processes 5

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  8. • GIS Workspace – all photo locations, waypoints, tracks, aerial imagery, marked terrain features, ect  can be quickly compared with previous years (photo comparison still manual) 8

  9. Photo Comparison 2009 2017 9

  10. Photo Comparison 2009 2017 10

  11. Photo Comparison 2016 2014 11

  12. Photo Comparison 2009 2017 12

  13. Historic Satellite 2002 Imagery 13

  14. Historic Satellite 2002 Imagery 14

  15. Historic Satellite 2012 Imagery 1 m LiDAR (2007) 15

  16. Historic Satellite 2013 Imagery 16

  17. Historic Satellite Imagery 2016 17

  18. Photo Comparison 2009 2017 18

  19. Historic Satellite Imagery 2013 2016 19

  20. 2016 20

  21. Conclusions • Comparison methodology used in the development of the site plan with focus on areas that have observable rates of activity and/or future potential to cause instability or hazard to the highway • Combination of LiDAR and satellite/aerial imagery allows broader view of site processes • Historic imagery provides better context to the development process and rate of mass waste events • Helps create target areas for next year and guide the inspection process, esp. for future inspectors • Process could be refined with new technology and more frequent data gathering (e.g. drone survey) 21

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