The AEG Southern Nevada Chapter holds dinner meetings eight times per year. Meetings are usually held on the second Tuesday of the month at the Embassy Suites Convention Center located at 3600 Paradise Road (just north of Twain/Sands) in Las Vegas, Nevada. Each meeting features a presentation regarding a pertinent geological, environmental, or other relevant science-based issue.
Due to the COVID-19 Pandemic, the May Meeting will be a
webinar run by AEG National. An email will be sent out
on how to register for the webinar.
May 11, 2021 - 6:30 p.m. PDT
"When Mountains Move Roads: Science, Engineering, and Management along the Big Sur Coast"
BY: Cheryl Hapke, PhD; AEG/GSA 2021 Jahns Distinguished Lecturer
Along the Big Sur coastline in central California, the Coast Range descends steeply into the Pacific Ocean, creating one of the most extreme coastal slopes in the coterminous United States. Weak rocks and steep topography provide ideal conditions for frequent large landslides that potentially contribute a substantial portion of material to the littoral sediment budget. Little was known about the sediment budget in this area, including the amount, rate and frequency of sediment input to the system from coastal landslides. Adjacent to the Big Sur coastline is the Monterey Bay National Marine Sanctuary (MBNMS), a protected area of coastal waters and home to a variety of aquatic species.
The California Department of Transportation (Caltrans) needed solutions to the difficulties they face with keeping slide-prone coastal Highway 1 open and safe while minimizing impacts to the MBNMS below the road. As a contribution to developing a highway management plan, and in order to advance the fundamental understanding of landslide and coastal processes along this stretch of coastline, a technique was developed to quantify the historical volume of sediment that enters the littoral system from coastal slope failures.
The technique uses aerial photography and digital photogrammetry to produce 3-dimensional stereo models from which digital terrain models (DTMs) are extracted. The sediment yield varies significantly along the coastline, from as low as 1,000 m3/km/yr to nearly 47,000 m3/km/yr. This variation is largely attributed to differing lithologies of the slope forming materials.
Dr. Cheryl Hapke is a coastal geologist with more than 25 years of experience studying coastal evolution and coastal change processes in a variety of geomorphic settings. She received her Ph.D. in Coastal Geology from the University of California Santa Cruz, a Master’s in Geology from the University of Maryland, and her B.S. in Geology from the University of Pittsburgh. Dr. Hapke worked for several decades with the U.S. Geological Survey as a research scientist, and now is a senior consultant with Integral Consulting, as well as a research professor at the University of South Florida, College of Marine Science. Her current research focuses on coastal vulnerability, hazards, and sea-level rise adaptation. She has authored over 80 peer-reviewed papers, book chapters, and technical reports, and served as a subject matter expert on coastal change hazards to local, state, and federal agencies.
Thank you to this month's sponsor!
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October 13, 2020
Nevada's Rapidly Evolving Landscapes: Heir Apparent to the San Andreas Fault, by Dr. James Faulds, Nevada State Geologist
November 10, 2020
A Geotechnical and Remote Sensing Approach to Monitor Rock Slope Stability within a Railroad Corridor near Caliente, Nevada, by Dr. El Hachemi Bouali, Assistant Professor of Geosciences at Nevada State College
January 12, 2020
Hydrogeology of Shallow Groundwater Contaminant Plumes in Las Vegas, NDEP guidance, and NDEP Cleanup Prioritization, by Ben Moan, Supervisor, Remediation and Leaking UST Branch, Bureau of Corrective Actions, Nevada Division of Environmental Protection
February 9, 2021
Groundwater Remediation Sites in Las Vegas Complicated by Significant Depth to Water Fluctuations
by Keith Stewart, President, Stewart Environmental Inc., Las Vegas