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Event
AEG Puget Sound Chapter Dinner Meeting November 2021
The AEG Puget Sound Chapter is pleased to invite you back to in-person dinner meetings. This month, we welcome Mark Molinari from GeoEngineers to talk about landslide modeling in western Washington.
Sponsored by GeoEngineers Inc.
Date: Thursday, November 18, 2021
Location: Art Marble 21
731 Westlake Ave N, Seattle, WA 98109
6:00 PM Social Hour
7:00 PM Dinner
8:00 PM Speaker: Mark Molinari
In-person: $45 (includes dinner)
Virtual: $20
Students: Free for the first 10 students to sign up, then $25 (includes dinner)
Meeting and Presentation will also be offered virtually.
Proof of COVID-19 vaccination for in-person attendance (checked upon entry to venue).
Dinner is included with your registration (for in-person attendance)! Multiple buffet-style items will be offered.
Alcoholic beverages available for purchase.
For details on parking, transit options, and virtual attendance, please visit aegpugetsound.org
Presentation Details:
Empirical Analysis and Development of Landslide Runout Equations for Glacial Strata in the Salish Lowland, Washington
Molinari, Mark P., GeoEngineers Inc.; Woodworth, Carla; Gibson, Cody; Deng, Michelle
Abstract: This study developed empirical relationships to estimate potential landslide runout for slopes in Salish Lowland river valleys draining the North Cascade Mountains in western WA. There are multiple published studies relating landslide runout parameters of length (L), height (H), reach angle (), deposit area (A) and volume (V) using linear or log regressions. Most data sets include varying landslide types and sizes, geology, and geographic locations and/or are for large, long runout debris flows, lahars and rock avalanches. River valleys in the eastern Salish Lowland are well suited for a regional empirical study because of available high-quality LiDAR, numerous Holocene landslides, and slopes with relatively consistent topography and geology of glacial and interglacial deposits with underlying weathered rock on some lower slopes.
Our data set consists of 223 landslides mapped in three river valleys: Cedar, North Fork Stillaguamish and Skagit-Finney Creek. The data includes H and L for debris slides/avalanches (162), debris flows (42) and flow and long runout (>3000 ft) landslides (19). Debris slides, avalanches and flow slides have unconstrained or partially constrained flow paths between the source area and valley floor, whereas debris flows have constrained flow paths. The failure H minimum is 34 ft and maximum is 955 ft, with 189 slides ranging in H from 100 ft to 600 ft. Runout lengths range from 127 ft to 6,175 ft. Analysis results indicate good correlations (R2 = 0.71 to 0.77) for regressions of H vs. L for the total data and subsets by landslide type. V vs. A data from the Cedar River valley also had good correlations; however, unlike some prior studies, relationships using or tan as a parameter have very poor correlations. Uncertainties in the source parameters and the equations can be used to assess a range of probabilities for future landslide runout risk assessment.
Bio
Mark Molinari is a Principal Engineering Geologist at GeoEngineers. He has 38 years experience in applied geology consulting. Mark provides senior level technical services and project management for engineering geology, hydrogeology, and geologic and seismic hazards projects throughout the U.S. and internationally. His experience includes onshore and offshore geologic and seismic hazard assessments (including numerous international locations); geologic and geomorphic mapping, and geology/hydrogeology evaluations for environmental impact studies/reports at a wide range of commercial, governmental and industrial facilities including dams, oil & gas facilities and powerplants. Mr. Molinari has a BA in geology from UC Santa Barbara and MS in geology from Univ. Nevada-Reno. He is a licensed Geologist in four states and Engineering Geologist in CA and WA. Mark is a Past-President of AEG.
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LocationArt Marble 21 (View)
731 Westlake Ave N.
Seattle, WA 98109
United States
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| Kid Friendly: No |
| Dog Friendly: No |
| Non-Smoking: Yes! |
| Wheelchair Accessible: Yes! |
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