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Saturday, November 14, 2020 | History

2 edition of Soil variability on steep, skeletal forested slopes of the Umpqua National Forest, Oregon found in the catalog.

Soil variability on steep, skeletal forested slopes of the Umpqua National Forest, Oregon

Ronald P. Myhrum

Soil variability on steep, skeletal forested slopes of the Umpqua National Forest, Oregon

  • 123 Want to read
  • 26 Currently reading

Published .
Written in English

    Subjects:
  • Plant-soil relationships.,
  • Soils -- Oregon -- Umpqua National Forest.

  • Edition Notes

    Statementby Ronald P. Myhrum.
    The Physical Object
    Pagination[10], 116 leaves, bound :
    Number of Pages116
    ID Numbers
    Open LibraryOL14228196M


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Soil variability on steep, skeletal forested slopes of the Umpqua National Forest, Oregon by Ronald P. Myhrum Download PDF EPUB FB2

Soil variability on steep, skeletal forested slopes of the Umpqua National Forest, Oregon Public Deposited. Soil variability on steep, skeletal forested slopes of the Umpqua National Forest, Oregon 公开 Deposited.

Soil variability on steep, skeletal forested slopes of the Umpqua National Forest, Oregon. Abstract. Graduation date: This study was undertaken to determine both the amount and the\ud spatial variability of sand, silt, clay, and six fractions of coarse\ud fragments in soils representing harsh sites for reforestation.

Particle size. Soils are more prone to mass movement in shallow and loose soils on impervious substratum, on steeper slopes, and under high intensity storms.

The human actions that make soils on steep slopes unstable include development, settlement, shifting cultivation, deforestation, forest fires, soil mining, and other slope : Khan Towhid Osman.

Source: Risk and Variability in Geotechnical Engineering, 1 Jan (33–46) Probabilistic stability analyses of undrained slopes with linearly increasing mean strength Authors: D. Zhu, D. Griffiths, J. Huang, G.

FentonCited by: national forest engineers, geologists, and soil scientists who were trying to apply textbook soil mechanics and ground water principles to steep forested terrain conditions and finding that the two were not always compatible. Rod is probably best known in the Forest Service for.

This study focuses primarily on inherent soil variability, where probabilistic analyses can be employed to assess the effect of this type of variability on slope stability. The importance of the spatial correlation structure of soil properties is highlighted and its effect on the stability of slope is studied.

Slope stability analysis This study focuses primarily on inherent soil vari-ability, where probabilistic analyses can be employed to assess the effect of this type of variability on slope stability. The importance of the spatial correlation struc-ture of soil properties is highlighted and its effect on the stability of slope is studied.

Slope stability analysis Also, for steep slopes (like 60°in this study), various studies have shown that the maximum depth that plant roots could grow is m (Miles and Sheila ; Chiatante et al. A steep slope refers to a sharp incline; a gentle slope to a slight incline.

The steep, forested slopes in Figure contrast with the gentler slope of the river’s path as it flows between them. Driving down a highway you may see a road sign that reads “6% Grade” or “Steep Grade.” The grade of the road is, essentially, its slope. The actual depth of the soil for this condition to occur depends on root morphology (depth, spread, etc.) of the particular tree species on the slope.

For example, on a slope where Red alder predominates, a relatively shallower soil depth would exhibit Type D conditions, while on a slope forested by Douglas-fir the stabilizing effects would be.

Angle. In general, a slope with a steep angle will have a greater impact on the soil composition compared to a gentle slant. As rain falls, the topsoil's nutrient-rich organic matter will move.

An illustration of an open book. Books. An illustration of two cells of a film strip. Video An illustration of an audio speaker. Full text of "Slope stability in road construction: a guide to the construction of stable roads in western Oregon and northern California".

Roots and the stability of forested slopes R.R. Ziemer, Forest Service, U.S. Dept. of Agric., Bayview Drive,Arcata, #California, U.S.A.

Abstract. Root decay after timber cutting can lead to slope failure. In situ measurements of soil with tree roots showed that soil strength increased linearly as root biomass increased. Slope instability is one of the major problems in geotechnical engineering where disasters, like loss of life and property, do occur.

The majority of these slope failures are of vegetated or forested natural slopes. A natural slope is different from an embankment or a man-made slope in that the effects of vegetation and soil variability. In order to evaluate the variability of the soil profiles at two shapes (concave and convex) and five positions (summit, shoulder, back slope, footslope and toeslope) of a slope, a study of a virgin area was made in a Beech stand of mountain forests, northern Iran.

Across the slope positions, the soil profiles demonstrated significant changes due to topography for two shape slopes. Area-averaged slope gradients are >60% at low elevation (AND 1, AND 2, AND 3, AND 9, AND 10) and 30% at high elevation (AND 6, AND 7, AND 8 Study basins are located along a gradient of seasonal.

In this study, soil loss data from natural runoff plots at three locations on the loess plateau in China were used to assess the effect of slope gradient on soil loss for slopes ranging from 9 to 55% steepness.

Plot size at each location was 5 m wide by 20 m long, and the soils were silt loams or silty-clay loam. north-facing slopes are less stable than south-facing slopes) on slope stability. No longer, though, is this acceptable. The engineering geologist is expected to know and understand theoretical and practical soil mechanics, better than the usual Civil Engineer, and nearly as well as the specialist, the Geotechnical Engineer.

The slope stability in this type of soil may be kept through the use of protective layer like cement mortar to the surface.

Factors such as erosion due to surface water and wind or degradation die to construction works are the sources of instability of steep slopes in such soil. Water bearing sand. ognition of the presence of soil variability, the follow-ing examples illustrate the manner in which variability is described by two national soil surveys.

In the U.S., older (circa ) U.S. Soil Conservation Service (SCS) soil series descriptions include a section entitled "range in characteristics" that give explicit, although. of Forestry and Environmental Studies, Yale Univ., New Haven, CT ; and D.S. Schimel. Natural Resource Ecology Lab.

Col-orado State Univ., Fort Collins. CO Received 7 Aug. Corresponding author. Published in Soil Sci. Soc. Aggregation and Aggregate Stability in Forest and Range Soils.

the equation to steepland forest areas generally have been unsuccessful-mainly because of inappropriate basic assumptions. Most erosion from for-ests is not the result of sheet overland flow.

In undisturbed forested steep-lands, mass erosion is the dominant mechanism by which soil is trans-ported from hillslopes to stream chan-nels. Then, for soil scientists or students working in the Inland Northwest United States, we look at particulars on sampling Andisols on National Forests in Idaho, Montana, Washington, and Oregon.

Field Sampling. In soil sampling, a problem is the representativeness of samples. H31GOregon Coast Range: Steep & Dissected Analysis of a flight of 7 fluvial terraces along the Siuslaw River, Oregon Coast Range, provides quantitative constraints on the evolution of soil properties on stable surfaces (, ).

The terrace chronology was established using a radiocarbon. piles and lagging, soil nailing, etc.). For reinforced steepened slopes, the reinforcement works with the compacted soil to create a stable mass that has enhanced geotechnical properties.

Thus, slopes with surface inclinations greater than the natural angle of repose of the soil, can be constructed. A steep ha unimproved pasture in southern West Virginia was studied to determine the spatial dependency of aboveground biomass production on soil characteristics.

The predominant soil of the study site was Gilpin silt loam (fine-loamy, mixed, mesic, Typic Hapludults) with an average A-horizon pH ( H 2 O) of (range to ).

Net strength of the soil-root matrix in brushfields was about 70 percent of that in uncut forests. If soils are barely stable with a forest cover, the loss of root strength following clear-felling can seriously affect slope stability Citation: Ziemer, R.

Roots and the stability of forested slopes. Reinforced Soil Slopes (RSS) and Steepened Slopes. Reinforced soil slopes and steepened slopes present unique stability challenges, but they can be better alternatives to other grade separation applications when there is a need or preference for one or more of the following.

Soil slopes: Shape controlled are faster than weathering (soil-forming) processes. Slopes are steep and have little to no soil (sensu stricto).

Structure and lithology control the shape of the slope. Angle. Description. 0°-0° plain. 0°' slightly sloping Badlands National Park, South Dakota; Pidwirny.

The soil resource inventory for the Wenatchee National Forest also shows soil depths of less than 5 ft. Tables 3 and 4, however, show 4- and 5-ft-deep soils on steep slopes (>35°) are sensitive to increases in soil moisture. In these cases trace amounts of moisture ( to ground-water ratios) are sufficient for failure to occur on.

soil for this condition to occur depends on root morphology (depth, spread, etc.) of the particular tree species on the slope. For example, on a slope where Red alder predominates, a relatively shallower soil depth would exhibit Type D conditions, while on a slope forested by Douglas-fi r the stabilizing effects.

Our objectives in this study were (1) to gather information about fire impacts on soil properties, (2) to determine the pre- and post-fire spatial and temporal variability of soil water repellency in steep chaparral, and (3) to investigate how selected soil properties and different plant species affect the distribution of soil water repellency.

Start studying Geology - slopes and soils. Learn vocabulary, terms, and more with flashcards, games, and other study tools. and Oregon, the windlaid ash deposits in central America, and the loess soils in the central United States and along the Yellow River in China.

Failure of a steep slope in cemented soil during a seismic event is usually spectacular because, if the strength of the soil is exceeded near the face of the slope, it collapses and cascades downward. arid areas- slopes are more _____ due to more _____ weathering. movements of rock/debris under the effect of gravity.

falls. movements of mass of soil or rock that contain a significant amount of water. flows. slow movements of material up to the surface of a slope and down slopes.

On steep slopes in the forest a tree will fall even before it dies if erosion eats away the soil around it. When a tree falls on a steep slope it will usually be caught by stumps from previous fallen trees or by clumps of woody undergrowth, it’s own branches, etc.

which will prevent it from rolling to the bottom of the slope. To learn more about our slope rehabilitation services click here. Vegetation (trees, shrubs, grasses, flower and ground covers) helps stabilize slopes in numerous ways.

Native plants provide wildlife habitat, are adapted to our native soils, can adapt better to climate disruptions, and interact with each other in ways hybrid/exotic plant communities do not.

If you have. The effects of topography on forest soil characteristics in the Oregon Cascade Mountains (USA): Implications for the effects of climate change on soil properties R.P. Griffithsa,*, M.D. Madritcha,b, A.K. Swansona,c aDepartment of Forest Ecosystems and Society, Oregon State University, Richardson Hall, Corvallis, ORUnited States.

This section discusses the description of rock fragments (especially stones and boulders) that are on the soil as opposed to in the soil. The description of gravel, cobbles, and channers (≥ 2 but.

To analyze the Umpqua Valley AVA's soils, data were obtained from the State Soil Geographic (STATSGO) Data Base for Douglas County Area, Oregon (NRCS, ).

Site suitability relative to soils was analyzed in a similar manner to Margary et al. () for New York, using the Soils Suitability Extension (SSE) with adjustments made for soils found.rock and engineering soil; soil is further divided into de-bris and earth. Some of the various combinations of move-ments and materials are shown by diagrams in Figure (in pocket in back of book); an abbreyiated version is shown in Figure Of course, the type of both movement and Figure Abbreviated classification of slope movements.Cruiser's camp at Little River on Umpqua National Forest N.

Umpqua Ranger Dist., June ; there were 9 forestry students in this camp. College of Forestry Photograph Collection (P 61) -- Forest Recreation. OSU Archives. Umpqua River Basin, Little .