Sedimentology, Behavior, and Hazards of Debris Flows at Mount Rainier, Washington PDF Download

Author: Kevin M. Scott
Publisher:
ISBN:
Category : Lahars
Languages : en
Pages : 68

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Author: Jonathan A. Czuba
Publisher: U.S. Department of the Interior, U.S. Geological Survey
ISBN:
Category :
Languages : en
Pages : 150

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Book Description
A study of the geomorphology of rivers draining Mount Rainier, Washington, was completed to identify sources of sediment to the river network; to identify important processes in the sediment delivery system; to assess current sediment loads in rivers draining Mount Rainier; to evaluate if there were trends in streamflow or sediment load since the early 20th century; and to assess how rates of sedimentation might continue into the future using published climate-change scenarios. Rivers draining Mount Rainier carry heavy sediment loads sourced primarily from the volcano that cause acute aggradation in deposition reaches as far away as the Puget Lowland. Calculated yields ranged from 2,000 tonnes per square kilometer per year [(tonnes/km2)/yr] on the upper Nisqually River to 350 (tonnes/km2)/yr on the lower Puyallup River, notably larger than sediment yields of 50–200 (tonnes/km2)/yr typical for other Cascade Range rivers. These rivers can be assumed to be in a general state of sediment surplus. As a result, future aggradation rates will be largely influenced by the underlying hydrology carrying sediment downstream. The active-channel width of rivers directly draining Mount Rainier in 2009, used as a proxy for sediment released from Mount Rainier, changed little between 1965 and 1994 reflecting a climatic period that was relatively quiet hydrogeomorphically. From 1994 to 2009, a marked increase in geomorphic disturbance caused the active channels in many river reaches to widen. Comparing active-channel widths of glacier-draining rivers in 2009 to the distance of glacier retreat between 1913 and 1994 showed no correlation, suggesting that geomorphic disturbance in river reaches directly downstream of glaciers is not strongly governed by the degree of glacial retreat. In contrast, there was a correlation between active-channel width and the percentage of superglacier debris mantling the glacier, as measured in 1971. A conceptual model of sediment delivery processes from the mountain indicates that rockfalls, glaciers, debris flows, and main-stem flooding act sequentially to deliver sediment from Mount Rainier to river reaches in the Puget Lowland over decadal time scales. Greater-than-normal runoff was associated with cool phases of the Pacific Decadal Oscillation. Streamflow-gaging station data from four unregulated rivers directly draining Mount Rainier indicated no statistically significant trends of increasing peak flows over the course of the 20th century. The total sediment load of the upper Nisqually River from 1945 to 2011 was determined to be 1,200,000±180,000 tonnes/yr. The suspended-sediment load in the lower Puyallup River at Puyallup, Washington, was 860,000±300,000 tonnes/yr between 1978 and 1994, but the long-term load for the Puyallup River likely is about 1,000,000±400,000 tonnes/yr. Using a coarse-resolution bedload transport relation, the long-term average bedload was estimated to be about 30,000 tonnes/yr in the lower White River near Auburn, Washington, which was four times greater than bedload in the Puyallup River and an order of magnitude greater than bedload in the Carbon River. Analyses indicate a general increase in the sediment loads in Mount Rainier rivers in the 1990s and 2000s relative to the time period from the 1960s to 1980s. Data are insufficient, however, to determine definitively if post-1990 increases in sediment production and transport from Mount Rainier represent a statistically significant increase relative to sediment-load values typical from Mount Rainier during the entire 20th century. One-dimensional river-hydraulic and sediment-transport models simulated the entrainment, transport, attrition, and deposition of bed material. Simulations showed that bed-material loads were largest for the Nisqually River and smallest for the Carbon River. The models were used to simulate how increases in sediment supply to rivers transport through the river systems and affect lowland reaches. For each simulation, the input sediment pulse evolved through a combination of translation, dispersion, and attrition as it moved downstream. The characteristic transport times for the median sediment-size pulse to arrive downstream for the Nisqually, Carbon, Puyallup, and White Rivers were approximately 70, 300, 80, and 60 years, respectively.

Author: Maria Radoane
Publisher: Springer
ISBN: 3319325892
Category : Science
Languages : en
Pages : 860

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New and innovative scientific theories, discussion and explanations are presented on landform dynamics and evolution in Romania along with a comprehensive understanding of the geomorphological processes shaping the large variety of Romania’s landscape. Thematically arranged the book deals with landform dynamics of specific relief types: glacial and periglacial, denudational, fluvio-denudational, fluvial, karst and coasts, as well as sediment fluxes, geomorphic hazards and risks. The authors are key scientists and researchers in the field and offer innovative views on research methods and concepts applied to the topics in question. This work will be of interest to students and researchers in geography, geomorphology, geology, environmental science, paleoclimatology and soil science as well as policy and decision-makers in spatial planning.

Author: Bruce Barcott
Publisher: Sasquatch Books
ISBN: 1570618003
Category : Sports & Recreation
Languages : en
Pages : 218

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A “provocative, highly original” profile of Mount Rainier—capturing the majestic beauty and deadly allure of one of the largest active volcanoes in the U.S. (Jon Krakauer, author of Into Thin Air) Mount Rainier is one of the largest and most dangerous volcanoes in the country, both an awesome natural monument and a formidable presence of peril. In The Measure of a Mountain, Seattle writer Bruce Barcott sets out to grasp the spirit of Rainier through an exploratory, meandering, and deeply personal journey along its massive flanks. From forest to precipice, thinning air to fractured glaciers, he explores not only the physique of Rainier but the psychology and meaning of all mountains—and the deep connection that exists between humans and landscape. What he finds is a complex of moss-bearded hemlocks and old-growth firs, high meadows that blossom according to a precise natural timeclock, sheets of crumbling pumice, fractured glaciers, and unsteady magma. Rainier’s snow fields bristle with bug life, and its marmots chew rocks to keep their teeth from overgrowing. The mountain rumbles with seismic twitches and jerks, seeing one-hundred-thirty earthquakes annually . . . Rainier is an obsession, a temple that attracts its own passionate acolytes—from scientists and priests to rangers, and mountain guides—as well as a monument to death. Referred to by locals as simply “the mountain,” it is the single largest feature of the Pacific Northwest landscape—provided it isn’t hidden in clouds. Visible or not, though, Rainer’s presence is undeniable. Filled with adventure, poignant personal reflections, and fascinating mountain lore told by Indian chiefs, professional guides, priests, and scientists, The Measure of a Mountain is one man’s stirring quest to reconcile with a dazzling creation of nature, at once alluring and sometimes deadly.

Author: Matthias Jakob
Publisher: Springer Science & Business Media
ISBN: 3540271295
Category : Science
Languages : en
Pages : 795

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With climate change and deforestation, debris flows and debris avalanches have become the most significant landslide hazards in many countries. In recent years there have been numerous debris flow avalanches in Southern Europe, South America and the Indian Subcontinent, resulting in major catastrophes and large loss of life. This is therefore a major high-profile problem for the world's governments and for the engineers and scientists concerned. Matthias Jakob and Oldrich Hungr are ideally suited to edit this book. Matthias Jakob has worked on debris flow for over a decade and has had numerous papers published on the topic, as well as working as a consultant on debris flow for municipal and provincial governments. Oldrich Hungr has worked on site investigations on debris flow, avalanches and rockfall, with emphasis on slope stability analysis and evaluation of risks to roads in built-up areas. He has also developed mathematical models for landslide dynamic analysis. They have invited world-renowned experts to joint them in this book.

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 308

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Author: Stephen G. Evans
Publisher: Geological Society of America
ISBN: 0813741157
Category : Science
Languages : en
Pages : 420

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This volume documents advances in our knowledge of catastrophic landslides, providing a worldwide survey of catastrophic landslide events. It draws on South America to illustrate dramatically the impact of these phenomena on human populations. The occurrence of catastrophic landslides, including site-specific insights, is shown through six events of the past 20 years. Several other chapters focus on the mechanisms involved with catastrophic landsides both in relation to geologic factors in a particular geographic area as well as to specific geologic processes.

Author: Geological Survey (U.S.).
Publisher:
ISBN:
Category : Geology
Languages : en
Pages : 962

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Author: Matthias Jakob
Publisher: Springer Nature
ISBN: 3031486919
Category : Debris avalanches
Languages : en
Pages : 645

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Zusammenfassung: This book provides a summary of the state of the art of all facets of debris-flow science and practice and is designed to be a comprehensive technical reference for practitioners and a state-of-the-art research overview for scientists. It is richly illustrated with equations, graphs, photos, and tables. The book allows students, practitioners, and regulators to get a sense of the current state of the art in this science. Currently, there are 2 to 3 papers published every week on some aspects of debris-flow science. This creates a bewildering amount of literature that cannot be captured by a single individual. This book provides a comprehensive overview of all facets to date, including initial hazard assessments, detailed quantitative risk assessments, debris-flow warning systems, debris-flow mitigation structure designs, and failures of mitigation works, as well as new topics such as climate change effects on debris flows

Author:
Publisher: DIANE Publishing
ISBN: 142896066X
Category :
Languages : en
Pages : 26

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