TOPIC: Mapping of Potential Landslide Hazards along the River Corridors of King County
SPEAKER: John Bethel, WA LEG and Sevin Bilir, WA LHG, CA CHG; King Country
TIME: 5:30 pm - Social Hour; 6:30 pm - Dinner; 7:30 pm - Presentation
PLACE: Best Western Executive Inn, 200 Taylor Ave N, Seattle, WA 98109, Phone: 206-448-9444
DINNER: Plated dinner (choose between the following when registering for the meeting): Cilantro-Lime Marinated Halibut with Lemon Salsa Verde. Served with Ginger Risotto and Seasonal Vegetables and a Washington Apple Crisp for dessert, or
Rainbow Quinoa Stuffed Peppers with Butternut Squash, Craisins, Pepitas, and Queso Fresco with a Tomato Reduction (Gluten Free and Vegetarian) and a Washington Apple Crisp for dessert.
RSVP: Register at http://pugetsoundaeg.bpt.me/ by 4 PM Friday, January 13.
COST: $40 for member registration by November 11; $45 for non-members; $15 for students. Nonmembers always welcome! Note that the pay at the door option is ONLY if you CANNOT
use a credit card. If you are paying at the door, please pay by cash or check (check payable to AEG).
Our gracious sponsor, Fremont Analytical, has made it possible for the AEG Puget Sound Chapter to provide meals at a reduced rate for AEG Student Members. Please go to http://www.fremontanalytical.com/ for more information about Fremont Analytical.
Student membership in AEG is free. Please follow this link www.aegweb.org and click on the “Join AEG” tab if you are interested in becoming a member of AEG.
The 2014 SR-530 landslide in Snohomish County, Washington, focused attention on landslide hazards in the Pacific Northwest. King County, located immediately south of Snohomish County, is similar in topography, geology, and climate; and is subject to similar landslide hazards. Climate change is projected to result in increased duration, intensity and frequency of rainfall events in the Pacific Northwest, leading to greater soil saturation and fluvial erosion which would further increase landslide potential. In order to better understand the character and extent of the landslides in the County, an assessment of existing landslide data was initiated in 2014 by King County. Study limits for this project were along the river corridors of Cedar, Green, Sammamish, South Fork Skykomish, Snoqualmie, and White Rivers and Issaquah Creek. Mapping methodologies were based on consultation with technical experts and current literature research. The following landslide types were mapped using landscape-scale methods; deep-seated landslides, debris slides, depositional fans, rock fall, and rock avalanches. Evidence of long runout events were identified at multiple locations. Although, it was determined that there is no feasible method for delineating runout areas on a landscape scale, characteristics that might predispose a large landslide to have a long runout event were identified. A webtool was prepared and is intended to be used as an information source on the mapped locations and types of potential landslide hazards identified by this mapping project.
John Bethel is almost, but not quite, a Puget Sound native, having moved to the area in the third grade. John completed his Bachelor of Science in Geology and Master of Science in Forest Soils at the University of Washington. After completing his academic work in 1982, John was employed by the U.S. Geological Survey and then moved into private consulting with geotechnical and environmental firms. In 1987, John began working for King County at the Building and Land Development Division (Now the Department of Development and Environmental Services), in 1992 he transferred to the Capital Projects Section of the Surface Water Management Division (now the Water and Land Resources Division (WLRD)). John currently works in the River and Floodplain Management Section in WLRD. He provides geomorphic and geotechnical assistance on capital project design, and conducts landslide and channel migration studies.
Sevin Bilir is a Washington and California State Licensed Geologist and Hydrogeologist with 20+ years of experience in soil, rock and ground water investigation management and reporting. Her experience includes project management, scope of work and budget preparation, subsurface interpretation, conceptual modeling, field work supervision, technical writing and business planning. At King County, she recently worked as project manager and engineering geology support for the King County Landslide Hazard Mapping Study along river corridors and has been assisting the Rivers and Floodplain Management Section on channel migration studies, site investigations and contract renewals. She has also been technical support for King County landfills and wastewater related projects. She has served in officer positions wand/ore been a member of the AEG in Texas, CA and WA state. More info can be found at https://www.linkedin.com/in/sevinbilir.