August Webinar

August 26, 2021

2:00 PM EDT 


Seismic stability of slopes across the Lower Mainland BC is investigated using the probabilistic solution of the Newmark sliding block analogy. Different seismicity sources in the region and the latest updates in sliding displacement prediction models are considered to present the probabilistic solution for the displacement of slopes from west to east of the Lower Mainland. Displacement seismic hazard curves are output from the probabilistic evaluation of the problem, which is presented and evaluated for a 2% probability of exceedance in 50 years hazard level based on the National Building of Canada.

The current procedure for seismic slope evaluation in Greater Vancouver is reviewed and critiqued with an illustrative example and the alternative probabilistic method is recommended for engineering practice. The current pseudo-probabilistic practice for earth-fill dams and slopes can result in an unconservative solution where the simplified probabilistic approach improves this procedure with rational consideration of earthquake scenarios and in a time-efficient way.

Presented by:

Ali Fallah Yeznabad, M. Sc., Ph.D.

Candidate in Geotechnical Engineering

Civil and Environmental Engineering Department

Western University, London, ON, Canada


Top 3 Lessons:

· Benefit of using Newmark sliding block analogy for local seismicity

· Best methods and improvements of the probabilistic approach

· Example application for the probabilistic-based design of slopes and earth-fill dams


September Webinar

Experimental Study of Ice Booms: An Attempt to Understand the Structures that Keep Ice at Bay

Thursday, September 23, 2021

3:00 PM EST



University of Manitoba’s Price Faculty of Engineering representatives will share their investigation of ice booms using experimental methods. Specifically, the objective is to quantify the flow around cylindrical ice booms. Using state-of-the-art particle imagery velocimetry facilities at the University of Manitoba, the flow surrounding small-scale models is being analyzed. Results of the study may be directly applicable to the design of ice booms. The hydraulic effects of ice booms are largely unknown, despite their various commercial applications. Many northern hydroelectric generating stations rely on booms to increase operational efficiency during winter months by stabilizing forebay ice conditions. Moreover, booms are commonly used to enhance wintertime river navigation by preventing surface ice from entering navigation channels.

Top 3 Lessons

1. Learn common commercial applications of ice booms

2. Gain an appreciation for the hydraulic effects of ice booms and how these effects may be considered in design

3. Understand how particle imagery velocimetry can be used to study ice booms and other waterway structures


Shawn Clark, Ph.D., P.Eng.

Professor, Department of Civil Engineering, Price Faculty of Engineering, University of Manitoba

Karen Dow, Ph.D., P.Eng.

Associate Professor, Department of Civil Engineering, Price Faculty of Engineering, University of Manitoba

Elijah Edie

Graduate Student, Department of Civil Engineering, Price Faculty of Engineering, University of Manitoba

Winner of the 2020 CDA Scholarship Award.


Previous Webinars 

Previous webinars can be viewed by CDA members here