December Meeting

Wednesday • December 5th 2018 • 6 – 9 PM

Old Market Pub • 6959 SW Multnomah Blvd, Portland, OR

6 PM — Social

6:45 PM — Dinner

(Salad & Pizza)

7:30 PM — Presentation

Reservations by 12 PM Monday, December 3rd*. Dinner pricing is as follows:

$25 – Private Industry • $20 – Public Agency • FREE for students

*There is a $2 surcharge for those who do not reserve by the deadline

Reservations can be made here: RSVP by 12 PM Monday, December 3rd

Will it Stay or Will it Go?: Use of Lidar to Assess Slope

Speakers: Dr. Ben Leshchinsky and Dr. Michael Olsen

Light detection and ranging technology, or lidar, is a promising tool for assessing unstable ground due to its resolution, accuracy, and the ability to process away visual obstacles, such as vegetation. In particular, laser scanning has significant utility when applied repeatedly over time, quantifying changes in terrain that may not be easily discernable to the eye. This presentation will touch on some ongoing research that employs lidar for (1) regional landslide inventorying and landslide susceptibility, (2) quantifying coastal retreat and its influence on landslide movements, and (3) evaluating potential rockfall risks. A semi-automated approach that uses lidar to recognize geomorphic features and supplement manual landslide inventorying is presented. Thereafter, an approach that uses landslide inventories to leverage region-specific, shallow landslide susceptibility is considered. An ongoing collection of lidar along the Oregon Coastline is used to better capture coastal erosion and its influence on slope instability. Lastly, a new rock slope assessment technique, the rockfall activity index will be presented. The increasing availability of lidar presents us with a unique opportunity to better assess the risk stemming from geohazards, enhance asset management, and understand geomorphic and geologic processes at a more refined level.

Speaker Bios: Dr. Ben Leshchinsky and Dr. Michael Olsen

Ben Leshchinsky is an associate professor in geotechnical engineering at OSU. Research focus is on basic and applied geomechanics, soil reinforcement, slope stability, and in recent years, use of remote sensing technologies applied towards assessment of natural hazards. Ben received his BS from the University of Delaware in 2007, and his MS and PhD from Columbia University in 2008 and 2012, respectively. Ben is a registered professional engineer in Oregon, an editorial board member of the ASCE Journal of Geotechnical and Geoenvironmental Engineering and Geotextiles and Geomembranes. He is the recipient of 2018 International Geosynthetics Society Young Member Achievement Award, the 2016 International Landslide Symposium Young Paper Award, among other awards for research and teaching.

Dr. Michael Olsen is an Associate Professor of Geomatics in the School of Civil and Construction Engineering at OSU. He is currently serving as the Editor-in-Chief for the ASCE Journal of Surveying Engineering, the Technical Implementation Director for the NSF-funded NHERI Rapid Experimental Facility, and President-Elect of the Surveying and Geomatics Educator Society. He received BS and MS degrees in Civil Engineering from the University of Utah and a Ph.D. in Structural Engineering from the University of California, San Diego. His current areas of research include terrestrial laser scanning, GIS, earthquake engineering, geohazard mapping, and 3D visualization. He teaches geomatics engineering courses at OSU where he has developed new, ground-breaking courses in 3D laser scanning and Digital Terrain Modeling. Recent projects he has been involved with include: development of mobile laser scanning guidelines for transportation agencies, development of advanced point cloud segmentation algorithms, earthquake and tsunami reconnaissance (American Samoa, Chile, Japan, New Zealand, and Nepal), landslide and slope stability analysis, seacliff erosion, liquefaction hazard mapping, and modeling and studying historical buildings such as the Palazzo Medici and Palazzo Vecchio in Florence, Italy.

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