Due to COVID-19, All SGG events are being held virtually. If you are not part of the SGG email list, please contact us to receive presentation invites.


Thermal Imagery Mapping of Saskatoon Riverbanks


January 20 @ 12 PM


Groundwater seepage is a contributing factor to slope instability.  Using Forward Looking InfraRed (FLIR) imagery to potentially delineate groundwater seepage has gained interest in recent years in academia, however there can be difficulties associated with the data collection and subsequent data processing.  These challenges range from physical challenges such as environmental conditions, to recommended data collection procedures which conflict with the physical limitations of the sensors.


A test site with known groundwater seepage has been identified and mapped several times throughout the course of 2020, where we (Caltech Surveys) have collected thermal imagery, colour imagery, lidar & multispectral imagery using Remotely Piloted Aircraft Systems (RPAS/UAV/UAS/Drones).  This presentation will discuss the challenges in collecting data, and alternative methodologies for collecting aerial thermal data will be discussed.  The use of Full Motion Video (FMV) will be suggested as an alternative to traditional orthorectified mapping.  In addition, multispectral data has been collected and any correlation to identified groundwater seepage from thermal imagery will be investigated.


My name is Greg Stamnes, I am a father of 2 daughters and husband to wife Melissa (APEGS P.Geo).  I am the Geospatial Manager for Caltech Surveys, overseeing our mapping operations, laser scanning, & bathymetric surveying.  I have education relating specifically to this topic from several institutions including BCIT, UF, and Penn State, and in addition I have recently completed my sUAS Level 1 Thermography Certification.


Performance of Granular Shear Keys on Landslide Remediation


February 17 2020


Canadian transportation industries have been using granular shear keys to remediate slope instabilities for decades. Engineers have used limit equilibrium (LE) analyses as the standard method for designing these granular shear keys. These LE analyses do not account for the strain required to mobilize the shear resistance in the granular backfill. Finite element methods can model deformation but require calibration and may not always be practical. A review of the design and corresponding performance of granular shear keys based on extensive empirical data could complement current design methods and enhance design effectiveness and reliability. This research presents the results of a review of 38 case histories, which involve either conventional trenched granular shear keys or rockfill column shear keys. The purpose of this compilation was to identify empirical relationships between shear key design and deformation.


Hugh Gillen, M.Sc., P.Eng., P.Geo.


Hugh is a Geotechnical Engineer with DST Consulting Engineers Inc. out of Waterloo, Ontario. His experiences have led to exposure to the oil and gas, mining, rail, and transportation industries in locations across Canada. In 2017, Hugh completed an M.Sc. in Geotechnical Engineering at the University of Alberta, where he was a member of the Railway Ground Hazard Research Program. His research explored the mitigation of landslides using granular shear keys, taking an empirical approach that involved compiling a database of case histories. Outside of work, Hugh is a regular blood donor and proudly supports the Canadian Blood Services.

  • LinkedIn Social Icon
  • Facebook Social Icon
©2019 by Saskatoon Geotechnical Group.