2 edition of Controls on movement of selected landslides in the Coast Range and western Cascades, Oregon found in the catalog.
Controls on movement of selected landslides in the Coast Range and western Cascades, Oregon
Bernard Bong-lap Wong
Written in English
|Statement||by Bernard Bong-Lap Wong.|
|The Physical Object|
|Pagination||193 leaves, bound :|
|Number of Pages||193|
The Oregon Coast Range is dissected by numerous unchanneled headwater basins, which can generate shallow landslides and debris flows during heavy or prolonged rainfall. An automated monitoring system was installed in an unchanneled headwater basin to measure rainfall, volumetric water content, groundwater temperature, and pore pressures at minute intervals. Start contour plowing on the slopes where landslides happen, and B). Plant vegetation on the slopes that experience landsides. A landslide is the movement of rock, debris or the earth down the slope. It is the down- slope movement of the rock and the soil under the influence of gravity, which huge damage to life and property on the earth.
A study conducted along the Lincoln County, Oregon coast delineated the exact location of landslides. The landslides were found through the interpretation of aerial photographs. Each landslide was verified in the field and its class (ancient, historic, recent), type (slump, debris slide or flow, planar slide),, and status (stable, potential Cited by: 2. Wooten, R. M., Cattanach, B. L., Bozdog, G. N., & Bullard, A. R. (). The North Carolina Geological Survey’s response to landslide events in and in the Blue Ridge Mountains of western North Carolina: Using a geodatabase, LiDAR and ortho-imagery in a geographic information system to augment field investigations and map by: 3.
Landslides typically occur during the winter months in western Washington and during the summer months in eastern Washington, but are possible at any time. Many of the landslide areas in Washington are a mixture of different slide types. SHALLOW LANDSLIDES Shallow landslides are rooted in the soil layer and often form slumpsFile Size: KB. Types of landslides: Landslides can be differentiated on the basis of the type of the movement and the material involved. The type of movement describes the internal mechanics of the displacement of the landslide mass. Falls: They occur by the detachment of the soil, rock or both from a steep slope, by bouncing falling or rolling.
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Landslide Hazards in Oregon fact sheet (PDF) Learn more about debris flow warnings Interactive Oregon Landslides Map (SLIDO) IMS, GIS overview map of potential rapidly moving landslide hazards in western Oregon, by R.
Hofmeister, D.J. Miller, K. Mills, J. A variety of mass-movement processes interact to form complex mass-movement terrains in the western Cascade Range in Oregon. Slow, deep-seated (>5 m depth) processes of creep, slump, and earthflow operate simultaneously and sequentially, resulting in unstable conditions that may initiate rapid, shallow.
Oregon Geology Landslide Hazards in Oregon Fact Sheet Oregon Department of Geology and Mineral Industries NE Oregon St., Suite Portland, OR OFile Size: 2MB.
western Cascades, in the Willamette National Forest, about 80 km east of Eugene. Oregon. The forest boundaries surround a ha watershed in which elevation ranges from to 1, m and typical slopes vary between 10° and 36° (Dyrness, ). At elevations below about 1, m, Douglas fir and western hemlock are the dominant tree species File Size: 2MB.
Vegetation composition on recent landslides in the Cascade Mountains of western Oregon. Can. For. Res. Shallow, rapid landslides are common events and significant causes of vegetation disturbance in the Pacific Northwest.
Landslides remove surface soil and above- and below-ground biomass from steep slopes and deposit them. They also are locating and dating landslides in the Oregon Coastal Range and Cascades to determine potential risks to the area’s dams. UO researchers, Weldon added, also have been working with the Oregon Department of Geology and Mineral Industries to locate and map previously unknown crustal fault zones.
Several have been found. The map sh past landslide locations compiled by the Oregon Department of Geology and Mineral Industries from published studies and maps by state and federal agencies. According to DOGAMI, a powerful enough winter storm can cause over $ million in landslide repairs. And on average, landslides cost the state $10 million a year.
Oregon with a high concentration in western Oregon‘s coast, Coast Range, Willamette Valley and Cascade Range. In a typical year, Oregon receives over 80 inches of rain in places along the coast, 40 to 45 inches in the Willamette valley and about 60 inches in the Cascades.
On one hand, landslides are a natural geological event that occurs on rain-drenched hillsides. On the other, human activities such as timber harvests can exacerbate the risk.
Infollowing a couple of drenching storms in western Oregon that resulted in thousands of landslides, a change was made to the state’s forest practices rules to. Coast Range Landslides a Historic Reality in Pacific Northwest J – The massive rainstorm that soaked the Pacific Northwest in early December caused major flooding, more than a dozen deaths and once again raised questions about the cause of the numerous, sometimes very destructive landslides which follow such events – including.
Landslides take lives, destroy homes, businesses and public buildings, interrupt transportation, undermine bridges, derail train cars, cover marine habitat and damage utilities. Causes. The term landslide includes a wide range of ground movement, such as rock falls, deep failure of slopes, and shallow debris flows.
At least three landslides – one that spanned somewhere between 75 to feet – have prompted closures along Oregon Route between Joseph and Imnaha in Eastern : Ericka Cruz Guevarra. "Landslides are a natural part of both the Oregon Coast Range and Cascade Range, but it's expected there will be a significant number of them that are.
LANDSLIDES AND DEBRIS FLOWS October A landslide is a mass movement of rock, soil, and debris down a slope. In steep terrain, even a small mass movement can transform into a larger, especially dangerous type of landslide.
These catastrophic landslides commonly are referred to as debris flows, mudslides, mudflows, debris torrents or shallow. The Oregon coast range is highly prone to landslides, which create a significant maintenance problem for the Department of Transportation.
Many causative factors contribute to the failure of these slopes including slope angle, slope and terrain roughness, weak soils, significant precipitation, and high groundwater levels. TRB Special Report Landslides: Analysis and Control brings together, from a wide range of experience, such information as may be useful in recognizing, avoiding, controlling, designing for, and correcting movement.
Current geologic concepts and engineering principles and techniques are introduced, and both the analysis and control of soil and rock-slopes are addressed. The landslides are delineated with polygon and line features as well as given 17 unique attributes, including a movement type, a movement azimuth, and a confidence rating (how certain the geologist is that the feature is a landslide).
A percentage of the landslides are field-checked and all landslide polygons are reviewed by a licensed geologist. Researchers have combined lidar and other geological tools to look under the forests and chart hundreds of landslides in the western Columbia River Gorge over many centuries.
In the Coastal Mountains and Cascades, the Tillamook County, Oregon, Emergency Management said it was anticipating as much as a foot of rain. A sinkhole in Gresham, Oregon.
Gresham Police Department. “Landslides are a natural part of both the Oregon Coast Range and Cascade Range, but it’s expected there will be a significant number of them that are seismically induced from a major.
Oregon Department of Geology and Mineral Industries for Washington and Oregon A Homeowner’s Guide to Landslides LANDSLIDES ARE ONE OF THE MOST COMMON AND DEVASTATING NATURAL HAZARDS IN THE PACIFIC NORTHWEST. THE DAMAGE THEY CAUSE IS ALMOST NEVER COVERED BY INSURANCE.Landslide Hazards in Oregon; Homeowner's Guide to Landslides: Recognition, Prevention, Control and Mitigation; Phone Kaen Road Suite A Oregon City, OR Office Hours: ⚠ Due to COVID, our offices are closed to the public.
At this time the closure is expected to continue through May Location: Kaen Road Suite A Oregon City, OR Fly down the coastal ت range of Oregon on a clear day and you'll see millions of acres of mountainside stripped by the timber giants of the Northwest -- companies such as Weyerheuser, International Paper, Roseburg Lumber, Georgia-Pacific, and Cavenham Forest Industries.
It is one of the most intensively logged mountain ranges in the world. On Nov. 18, a landslide in a rur.