692 resultados para Unconsolidated Sands
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Top Row: Jessica M. Adair, Casey Arnett, Amy Lynn Babchek, Mary E. Bartlett, Rhonda Bass, Nancy Bidlack, Heather Bjerke, Stacy Bodrie, Dana Boonstra, Kellu Bowers, Pamela Bowser, Rachel L. Bradley, Michele Brotherton, Stacie Buckler, Hope Bufkin
Row 2: Saran Burnley, Jennifer Caraan, Barbara Carpenter, Nutrena Helene Watts, Aimee Schuman, Debra Jameson, Jennifer Jennings, Mary Cassette, Nikki Burns, Lisa Multhaupt, Jeffrey M. Adams, Christine Hepner, Julie Chamberlain, Andy Chan, Jennifer Choike
Row 3: Heather Chrisman, Abbey C. Clark, Renita Cobb, Amy Cotton, Cattleya Crossen, Kimberly Curl, Christy Debolt, Patricia DeLamielleure, Jennifer Dyer, Lisa L. Eliasom, Patricia Fowler Faling, Rita Fallone
Row 4: Richard Fisher, Rebecca J. Forbes, Tiffany Fowler, Karen R. Fritz, Debbie M. Fulton, Michelle J. Gaskill, Ellen M. Gavin, Emily Golin, Umeika Makita Griffith, Lydia D. Hampton, Natalie Michele Hoffman, Julie Holbird
Row 5: Kathryn A. Huffman, Tara Lynn Humphrey, Nicole Jaccques, Michelle C. Johnson, Bryan Wayne Kerridge, Violet H. Barkauskas, Beverly Jones, Ada Sue Hinshaw, Nola Pender, Susan Boehm, Noelle Kirouac, Sarah Kohn, Sherri Krajenta, Brian Kubinski, Stephanie L. Kuczera
Row 6: Heather Lange, Sang Hee Lee, Soya Lee, Natalie Lehrer, Kimberly Lilley, Elizabeth A. Lundy, Darcey Lutz-Guenther, Michelle J. Malicsi, Dawn Marteeny, Sheila Mendiola, Sharon Mitchell, Caryl S. Molton, Colette Montilla, Celeste Montone-Horne, Emily T. Mooney, Naima Moore
Row 7: Kami Nobis, Thresa M. Nugent, Michelle Ober, Nisha Patel, Stephanie Perrett, Holly Powers, Julie L. Pryor, Elizabeth K. Rachubinski, Anne Rammelkamp, Kathy Rarog, Erin Richards, Amy Roehrig, Catherine Ann Rosloniec, Tansey Rosset, Kimberly Sanders, Marla Sands, James C. Sausser
Row 8: Juana Sebree, Erin J. Showers, Prabhjyot Singh, Lynn Sinkel, Nicole LaDon Smith, Nicole M. Speck, Mickie Speers, Krista Stapleton, Karon Starr, Elizabeth Studley, Janice Brenda Supena, Rashelle Talbert,Kimberly Tocco, Edda Toting, Lisa Uren, Lori VanBergen
Row 9: Lisa VanStratton, kathleen Veenstra, Kristen Venadam, Rhonda E. Walkowe, Ching-Ru Bonny Wang, Deborah Webb, Ruthann Clausen Weiss, Debra R. White, Rochelle Whiteman, Tara Wilson, Jessica Wise, Sheryl Woloskie, Denice Annette Zakalata, Rebecca S. Zeiler
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U.S. Marines advancing under combat conditions. Caption; "Making slow progress over volcanic sands off SE Beaches at Iwo. Mt. Suribachi looms through dust and smoke in the background."
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From "Sands Against the Wind" by John Dancy, p.128
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From "Sands Against the Wind" by John Dancy, pg. 65
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Mode of access: Internet.
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Mode of access: Internet.
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v. 9. Off on a comet. The underground city.--v. 10. Dick Sands: A captain at fifteen. The dark continent. Measuring a meridian.--v. 11. The five hundred millions of the begum. The tribulations of a Chinaman in China. The giant raft: Eight hundred leagues on the Amazon.--v. 12. The giant raft: The cryptogram. The steam house: The demon of Cawnpore. Tigers and traitors.--v. 13. The Robinson Crusoe school. The star of the south. Purchase of the North pole.--v. 14. Robur the conqueror. The master of the world. The sphinx of ice.--v. 15. The exploration of the world: The world outlined. Seekers and traders. Scientific exploration.
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Mode of access: Internet.
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By Katherine Harris Bradley and Edith Emma Cooper as joint authors.
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One map on folded leaf in pocket of Vol. 1.
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Mode of access: Internet.
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Mode of access: Internet.
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The Seattle Fault is an active east-west trending reverse fault zone that intersects both Seattle and Bellevue, two highly populated cities in Washington. Rupture along strands of the fault poses a serious threat to infrastructure and thousands of people in the region. Precise locations of fault strands are still poorly constrained in Bellevue due to blind thrusting, urban development, and/or erosion. Seismic reflection and aeromagnetic surveys have shed light on structural geometries of the fault zone in bedrock. However, the fault displaces both bedrock and unconsolidated Quaternary deposits, and seismic data are poor indicators of the locations of fault strands within the unconsolidated strata. Fortunately, evidence of past fault strand ruptures may also be recorded indirectly by fluvial processes and should also be observable in the subsurface. I analyzed hillslope and river geomorphology using LiDAR data and ArcGIS to locate surface fault traces and then compare/correlate these findings to subsurface offsets identified using borehole data. Geotechnical borings were used to locate one fault offset and provide input to a cross section of the fault constructed using Rockworks software. Knickpoints, which may correlate to fault rupture, were found upstream of this newly identified fault offset as well as upstream of a previously known fault segment.
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Contributing to the evaluation of seismic hazards, a previously unmapped strand of the Seattle Fault Zone (SFZ), cutting across the southwest side of Lake Washington and southeast Seattle, is located and characterized on the basis of bathymetry, borehole logs, and ground penetrating radar (GPR). Previous geologic mapping and geophysical analysis of the Seattle area have generally mapped the locations of some strands of the SFZ, though a complete and accurate understanding of locations of all individual strands of the fault system is still incomplete. A bathymetric scarp-like feature and co-linear aeromagnetic anomaly lineament defined the extent of the study area. A 2-dimensional lithology cross-section was constructed using six boreholes, chosen from suitable boreholes in the study area. In addition, two GPR transects, oblique to the proposed fault trend, served to identify physical differences in subsurface materials. The proposed fault trace follows the previously mapped contact between the Oligocene Blakeley Formation and Quaternary deposits, and topographic changes in slope. GPR profiles in Seward Park and across the proposed fault location show the contact between the Blakeley Formation and unconsolidated glacial deposits, but it does not constrain an offset. However, north-dipping beds in the Blakely Formation are consistent with previous interpretations of P-wave seismic profiles on Mercer Island and Bellevue, Washington. The profiles show the mapped location of the aeromagnetic lineament in Lake Washington and the inferred location of the steeply-dipping, high-amplitude bedrock reflector, representing a fault strand. This north-dipping reflector is likely the same feature identified in my analysis. I characterize the strand as a splay fault, antithetic to the frontal fault of the SFZ. This new fault may pose a geologic hazard to the region.
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In November 2006, the flood of record on the upper Nisqually River destroyed part of Sunshine Point Campground in Mount Rainier National Park, Washington. The Nisqually River migrated north and reoccupied five acres of its floodplain; Tahoma Creek partially avulsed into the west floodplain, topping banks of an undersized channel and flooding the campground. I assessed hazards to infrastructure at the old campground location, where the Park proposes to rebuild the remaining campground roads and sites. This assessment focuses on two major hazards: northward Nisqually River migration, which may reincorporate the floodplain into the river destroying infrastructure; and Tahoma Creek avulsions, which may flood the campgroud and deposit sediment burying campground infrastructure. I quantify northward migration by: estimating migration rates and changes to channel width; evaluating river occupation of the pre- and post-2006 campground; and estimating scour depths at revetments protecting the campground. I digitized the Nisqually River channels and channel centerlines from maps and images between 1955 and 2013 into a GIS, which I used to estimate migration rate and river width changes. Centerline migration rates average 9 ft/yr along the length of the Nisqually River study reach; at Sunshine Point lateral migration rates average 11 ft/yr. Maximum migration along the study reach was 19 ft/yr between 2006 and 2009. Greater than average migration rates and channel widths correspond to river confluences and include the Tahoma Creek confluence at Sunshine Point. To determine historical channel locations and the frequency that the river occupied different parts of its floodplain, I digitized the river from maps and images between 1903 and 2013. The Nisqually River flows through Sunshine Point Campground in eight out of 15 historical images. I assess scour at revetments protecting infrastructure from the Nisqually River during a 100-year recurrence interval flood using measured cross-sections. During a 100-year flood, the Nisqually River may scour up to 10 feet below the bed elevation. These scour depths can destabilize critical revetments leaving loose unconsolidated riverbanks exposed to Nisqually River flows. To determine the causes, locations, and frequency of flood hazards from Tahoma Creek avulsions, I field map avulsion channels and compare the results with imagery and channel width changes between 1955 and 2013. Mapped avulsion channels occur with swaths of dead vegetation or nascent vegetation; both dead and recent vegetation are visibly distinct from surrounding vegetation in aerial images. Times of changes to these vegetation anomalies correspond to increases in Tahoma Creek channel width. Avulsions have occurred at least three times in the study period: pre-1955, between 1979 and 1984, and in 2006. The 1984 and 2006 avulsions both occur after increases in Tahoma Creek reach averaged width. The NPS is considering two options to rebuild Sunshine Point Campground, both at the same location. The hazards posed by the Nisqually River and Tahoma Creek at Sunshine Point will affect both construction options equally. Migration hazards to the campground may be reduced by limiting the proposed campground infrastructure to an elevated ridge that has not been occupied by the Nisqually River since 1903. The hazards of damage from migration may be reduced by revetments, which were effective in preventing northward Nisqually River migration in 1959 and 1965. Tahoma Creek avulsions are related increased of Tahoma Creek reach averaged widths, which are near a 58- year maximum, and occurred during a 10-year flood in 1984. The campground may be as susceptible to flooding from avulsions during as little as a 10-year flood. A large avulsion may occur with the next significant Tahoma Creek width increase. Glacial retreat has been shown to increase debris flow activity and increase sediment delivery to Mount Rainier rivers. Increased sediment discharge has been correlated with aggradation, which will further encourage Tahoma Creek avulsions.