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2 edition of Erosion over time on severely disturbed granitic soils found in the catalog.

Erosion over time on severely disturbed granitic soils

Walter F. Megahan

Erosion over time on severely disturbed granitic soils

a model

by Walter F. Megahan

  • 140 Want to read
  • 14 Currently reading

Published by Intermountain Forest and Range Experiment Station, Forest Service, U.S. Dept. of Agriculture in Ogden, Utah .
Written in English

    Subjects:
  • Soil erosion -- Mathematical models.

  • Edition Notes

    Bibliography: p. 14.

    StatementW.F. Megahan.
    SeriesUSDA Forest Service research paper INT -- 156.
    The Physical Object
    Pagination14 p. :
    Number of Pages14
    ID Numbers
    Open LibraryOL16023003M

    A = R K L S C P, where A is the computed soil loss per unit area, expressed in the units selected for K and for the period selected for practice, these are usually selected so that A is computed in tons per acre per year, but other units can be selected.. R, the rainfall and runoff factor, is the number of rainfall erosion index units, plus a factor for runoff from snowmelt or applied.   i want thes book can you give me please. Selected pages. Page Page Page Title Page. Table of Contents. Contents. INTRODUCTION. 9: CHAPTER 1 BASIC TERMINOLOGY. CHAPTER 2 CLASSIFICATION OF SOIL EROSION. CHAPTER 3 PROBLEMS AND METHODS OF SOIL EROSION RESEARCH. CHAPTER 4 EROSION FACTORS AND CONDITIONS Reviews: 1.


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Erosion over time on severely disturbed granitic soils by Walter F. Megahan Download PDF EPUB FB2

EROSION OVER TIME ON SEVERELY DISTURBED GRANITIC SOILS: A MODEL W. Megahan INTERMOUNTAIN FOREST AND RANGE EXPERIMENT STATION Forest Service U. Department of Agriculture Ogden, Utah Roger R.

Bay, Director. Get this from a Erosion over time on severely disturbed granitic soils book. Erosion over time on severely disturbed granitic soils: a model. [Walter F Megahan; United States.

Department of Agriculture.; Intermountain Forest and Range Experiment Station (Ogden, Utah),; United States. Forest Service,] -- "A negative exponential equation containing three parameters was derived to describe time trends in surface erosion on severely disturbed soils.

Get this from a library. Erosion over time on severely disturbed granitic soils: a model. [Walter F Megahan; Intermountain Forest and Range Experiment.

Surface Erosion Control on Roads in Granitic Soils. Proceedings of Symposium Sponsored by Committee on Watershed Management, Irrigation & Drainage Div., ASCE, ASCE Convention, Denver, CO, April May 1, Erosion over time on severely disturbed granitic soils: a model / (Ogden, Utah: Intermountain Forest and Range Experiment Station, Forest Service, U.S.

Dept. of Agriculture, ), by Walter F. Megahan (page images at HathiTrust). ing treatments for erosion control, have been devel­ 5. W.F. Megahan. Erosion Over Time on Severely Disturbed Granitic Soils: A Model. Forest Service, U.S. Department of Agriculture, Inter­ Rental Rate Blue Book for Construction Equip­.

The book deals with several aspects of soil erosion, focusing on its connection with the agricultural world. Chapters’ topics are various, ranging from irrigation practices to soil nutrient, land use changes or tillage methodologies. The book is subdivided into fourteen chapters, sorted in four sections, grouping different facets of the topic: introductive case studies, erosion Cited by: 9.

Soil Erosion Soil erosion is the detachment and movement of soil material. The process may be natural or accelerated by human activity.

Depending on the local landscape and weather conditions, erosion may be very slow or very rapid. Natural erosion has sculptured landforms on the uplands and built landforms on the lowlands. Its rate. Weathering and Erosion. Bedrock refers to the solid crystalline rock that makes up the Earth’s outer crust.

Weathering is a process that turns bedrock into smaller particles, called sediment or soil. Mechanical weathering includes pressure expansion, frost wedging, root wedging, and salt al weathering includes carbonic acid and hydrolysis, dissolution, and oxidation.

Rill erosion refers to the development of small, ephemeral concentrated flow paths which function as both sediment source and sediment delivery systems for erosion on hillslopes.

Generally, where water erosion rates on disturbed upland areas are greatest, rills are active. Flow depths in rills are typically of the order of a few centimetres (about an inch) or less and along-channel slopes may.

Magahan, W.F. (): Erosion over time on severely disturbed granitic soils, USDA Forest Serv. Res. Pap. INT, pp.1–14 Google Scholar Magahan, W.F. and G.L. Ketcheson (): Predicting downslope travel of granitic sediments from forest roads in Idaho, Water Resource Res.

: Masami Shiba. Start studying Weathering, Erosion, & Soil. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Search. roots widen rock cracks over time. how do plants act as an agent to mechanical weathering.

desert soils. which area has the greatest bedrock layer. parent material, time of decay, plants and animals. Erosion Over Time on Severely Disturbed Granitic Soils; A Model. Forest Service Research Paper INT, U.S.

Department of Agriculture, Intermountain Forest and Range Experiment Station, U.S. Government Printing Office, Washington, D.C., 14 pp. Google ScholarCited by: Road Sediment Production and Delivery: Processes and Management - Unpublished Long Paper from World Landslide Forum Erosion over time on severely.

disturbed granitic soils. gest that erosion rates are much higher in the early part of a runoff event than in the latter part of the event on forest roads [Foltz et al., ] and burned rangeland [Pierson et al., ]. These rapid changes in the rill erosion rate on disturbed soils may be caused by the winnowing of fine orCited by: minimize erosion from disturbed surfaces.

Purpose: To stabilize the soil, to reduce raindrop impact, to reduce the velocity of surface runoff, and to prevent erosion. Applicability: Applicable to cleared, graded, disturbed slopes, or where vegetation alone does not provide adequate erosion protection.

Advantages: 1. Stabilizes the soil. Size: 25KB. To perform this study, it was necessary to understand how soil erosion occurs. Usually it occurs at a low level but can become a problem when the ecological balance disturbed by human’s activities or severe risk of erosion by water when soils with a high sand or silt content that exposed to heavy rainfall.

(Defray ). Erosion by Water. Rainfall Intensity and Runoff: The impact of raindrops will break up the soil and water build-up will create runoff, taking sediment with it.

Soil Erodability: Based on the characteristics of each unique soil, it is more or less susceptible to erosion. Recurring erosion is more typical for soil in areas that have experienced erosion in the past.

The On-Site Impacts of Soil Erosion. The main on-site impact of soil erosion is the reduction in soil quality which results from the loss of the nutrient-rich upper layers of the soil, and the reduced water-holding capacity of many eroded soils.

About 50 years ago, scientists at the U.S. Department of Agriculture (USDA) devised the Universal Soil Loss Equation (USLE), a formula farmers could use to estimate losses from soil erosion.

Data indicated yields to be severely depressed on all topsoil removal treatments where no fertilizer was applied. On the coarse textured soils, even twice the recommended rate of fertilizer was not able to bring the yields back to that of the control.” (Kapoor and Shaykewich, ; Kenyon and Shaykewich, ) A.

Wind erosion Background. Megahan, Walter F. Erosion Over Time on Severely Disturbed Granitic Soils: A Model. USDA Forest Service Research Paper INT Intermountain Forest and Range Experiment Station. Ogden, Utah. 14 Pages. Oregon Association of County Engineers and Surveyors.

Appendix A: BMPs for Dust Abatement Practices on Unpaved County Roads in Size: KB. Soil erosion affects a large part of the Earth surface, and accelerated soil erosion is recognized as one of the main soil threats, compromising soil productive and protective functions.

The land management in areas affected by soil erosion is a relevant issue for landscape and ecosystems preservation. In this book we collected a series of papers on erosion, not focusing on agronomic Cited by: Soil erosion is the displacement of the upper layer of soil, it is one form of soil natural process is caused by the dynamic activity of erosive agents, that is, water, ice (glaciers), snow, air (wind), plants, animals, and humans.

Megahan, Walter F. Erosion Over Time on Severely Disturbed Granitic Soils: A Model. USDA Forest Service Research Paper INT Intermountain Forest and Range Experiment Station. Ogden, Utah. 14 Pages. Oregon Association of County Engineers and Surveyors. Appendix A: BMPs for Dust Abatement Practices on Unpaved County Roads in Oregon.

A set of thirty 2-m**2 erosion plots was used to study erosion occurring on steep road fills constructed with granitic soil materials in the Idaho Batholith. Erosion data were collected for a. Salinization is the build up of salt in the soil over time. Salinization inhibits production of [email protected] of all irrigated cropland.

Salinization can be caused by excessive irrigation. Water deposits salts which prevent infiltration and leaves water closer to the surface.

In dry areas. A study on six underlying surfaces from disturbed soils with different soil–rock ratio was carried out to determine the runoff erosion process in the Three Gorges Reservoir Area, China. Runoff regime on all underlying surfaces manifest as turbulent and subcritical flow during runoff scouring by: The erosion and productivity of soils containing rock fragments has received limited study in the United States.

Yet these soils represent a significant fraction of the U.S. soils. Nearly 46 million ha that are listed in the USDA-SCS map unit use file (MUUF) have rock fragments in their surface. dispersive (Note: dispersive soils can be very patchy in distribution). Dispersive Soils – High Risk of Tunnel Erosion What is it.

Dispersive soils, or sodic soils, collapse or disperse to form dissolved slurry when in contact with fresh water (rain). These soils are highly prone to erosion often leading to. Weathering vs. Erosion Weathering the decomposition of earth rocks, soils and their minerals through direct contact with the planet's atmosphere.

Weathering occurs in situ, or quot;with no movementquot;, and thus should not to be confused with erosion, which involves the movement and disintegration of rocks and minerals by agents such as water.

Soil erosion. Soil erosion is a major problem affecting soils all over the world. It is a process that involves the removal and transport of soil by wind and water. Whilst erosion is natural process, human activities such as changes in farming and land management practices, can cause it to occur much faster than under natural conditions.

Loss of production in eroded soil further degrades its productivity which in turn accelerates soil erosion. The cumulative effect observed over a long period of time may lead to irreversible loss of productivity in shallow soils with hardened plinthite or in soils that respond to expensive management and additional inputs (Lal,).

The appearance of plants — and so of soil — in the geological time scale. Soil is naturally removed by the action of water or wind: such 'background' (or 'geological') soil erosion has been occurring for some million years, since the first land plants formed the first soil. This book describes the developments leading to the Original Cam Clay model, focusing on fundamentals of the shearing of soil.

The aim is to lay the groundwork of understanding that should form the basis of geotechnical design, guiding engineers towards the class of behaviour to be expected under different combinations of effective stress and water content.2/5(1).

Soils on slopes are naturally more prone to erosion than soils on flatter land. The length of the slope is also important. Runoff from longer slopes can gain speed and thus energy as it flows down the slope and increase erosion. Place your mouse over the the image below to see the difference between a typical Lesotho stream before rain & after.

Soil Disturbance and Hill-Slope Sediment Transport After Logging of a Severely Burned Site in Northeastern Oregon James D. McIver, Forestry and Range Sciences Laboratory, Pacific Northwest Research Station, La Grande, OR ; and R. McNeil, Malheur National Forest, USDA Forest Service Region 6, John Day, OR Cited by: Measuring severity of erosion.

The degree of soil erosion is judged by the amount of original surface material remaining in the upper 8 inches of soil.

The three classes of soil erosion are illustrated in the figure to the right. Soil erosion classes are determined from the plow layer (Ap), or upper 8 inches if the Ap is less than 8 inches: 1. The soil profile Soil horizons.

Soils differ widely in their properties because of geologic and climatic variation over distance and time. Even a simple property, such as the soil thickness, can range from a few centimetres to many metres, depending on the intensity and duration of weathering, episodes of soil deposition and erosion, and the patterns of landscape evolution.

STYCZEN, M.E., FOLLY, A.J.V. The European soil erosion model (EUROSEM): documentation and user guide. Silsoe College, Cranfield University. iii C ATCHMENT CHARACTERISTICS FILE 43 O UTPUT F ILES 58 RUNNING EUROSEM 65 CHAPTER 5 File Size: KB.

Soil erosion: cause and effect H.E. Dregne Soil erosion is the main reason why desertification is irreversible. Vegeta- tion can regenerate from a degraded state as long as the seed stock remains viable and there is soil for seeds to germinate and grow in. Water and wind are the two main mechanisms by which soil is eroded and by: Minimizing topsoil disturbance is preferred to topsoiling, especially on sensitive soils, such as those derived from granitic and serpentine bedrock (Claassen and others ).

Salvaging Topsoil. Salvaging topsoil is done in areas that will be severely disturbed during construction. These areas are usually identified early in the planning stages.Erosion reduces the productivity of the land resource. Sediment degrades water quality and often carries soil-absorbed polluting chemicals.

Sediment deposition in stream channels, irrigation canals, reservoirs, estuaries, harbors, and water conveyance structures reduces the capacities of these water bodies to perform their prime functions and often requires costly treatments.