Download or read book Slope Stability Problems Associated with Timber Harvesting in Mountainous Regions of the Western United States written by Douglas N. Swanston and published by . This book was released on 1974 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural soil-mass-movements on forested slopes in the Western United States can be divided into two major groups of closely related landslide types. These include, in order of decreasing importance and regional frequency of occurrence: (1) debris slides, debris avalanches, debris flows, and debris torrents; and (2) creep, slumps, and earth flows. Each type requires the presence of steep slopes, frequently in excess of the angle of soil stability. All characteristically occur under high soil moisture conditions and usually develop or are accelerated during periods of abnormally high rainfall. Further, all are encouraged or accelerated by destruction of the natural mechanical support on the slopes. As forest operations shift to steeper slopes, they play an increasing role in initiation and acceleration of soil mass movements. The logging operation itself is a major contributor through (1) destruction of roots, the natural mechanical support of slope soils, (2) disruption of surface vegetation cover which alters soil water distribution, and (3) obstruction of main drainage channels by logging debris, Road building stands out at the present time as the most damaging operation with soil failures resulting largely from slope loading (from road fill and sidecasting), oversteepened bank cuts, and inadequate provision for slope and road drainage. At the present time attempts at prevention and control are limited to identification and avoidance of highly unstable areas and development and implementation of timber harvesting techniques least damaging to natural slope stability.

Download or read book Slope Stability Problems Associated with Timber Harvesting in Mountainous Regions of the Western United States written by Douglas N. Swanston and published by . This book was released on 1974 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Natural soil-mass-movements on forested slopes in the Western United States can be divided into two major groups of closely related landslide types. These include, in order of decreasing importance and regional frequency of occurrence: (1) debris slides, debris avalanches, debris flows, and debris torrents; and (2) creep, slumps, and earth flows. Each type requires the presence of steep slopes, frequently in excess of the angle of soil stability. All characteristically occur under high soil moisture conditions and usually develop or are accelerated during periods of abnormally high rainfall. Further, all are encouraged or accelerated by destruction of the natural mechanical support on the slopes. As forest operations shift to steeper slopes, they play an increasing role in initiation and acceleration of soil mass movements. The logging operation itself is a major contributor through (1) destruction of roots, the natural mechanical support of slope soils, (2) disruption of surface vegetation cover which alters soil water distribution, and (3) obstruction of main drainage channels by logging debris, Road building stands out at the present time as the most damaging operation with soil failures resulting largely from slope loading (from road fill and sidecasting), oversteepened bank cuts, and inadequate provision for slope and road drainage. At the present time attempts at prevention and control are limited to identification and avoidance of highly unstable areas and development and implementation of timber harvesting techniques least damaging to natural slope stability.

Download or read book USDA Forest Service General Technical Report PNW written by and published by . This book was released on 1977 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Lindane in forestry written by Thomas W. Koerber and published by . This book was released on 1976 with total page 706 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Report No FHWA RD written by United States. Federal Highway Administration. Offices of Research and Development and published by . This book was released on 1979 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book General Technical Report PNW GTR written by and published by . This book was released on 1987 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Influence of Forest and Rangeland Management on Anadromous Fish Habitat in Western North America written by and published by . This book was released on 1979 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Vegetation and Slopes written by Institution of Civil Engineers (Great Britain) and published by Thomas Telford. This book was released on 1995-04-06 with total page 318 pages. Available in PDF, EPUB and Kindle. Book excerpt: Contains the papers from an international conference on vegetation and slopes and clarifies the concepts and benefits of the use of vegetation on slopes. This book highlights practices which are of relevance to slope design and management.

Download or read book Draft environmental impact statement written by United States. Forest Service and published by . This book was released on 2000 with total page 520 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Forest Management and Redwood National Park written by United States. Congress. House. Committee on Government Operations. Conservation, Energy, and Natural Resources Subcommittee and published by . This book was released on 1976 with total page 780 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Final Environmental Impact Statement for the Forest Plan written by and published by . This book was released on 1987 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proposed Issuance of Multiple Species Incidental Take Permits Or 4 d Rules Covering the Washington State Forest Practices Habitat Conservation Plan written by and published by . This book was released on 2005 with total page 1084 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Monthly Catalog of United States Government Publications written by and published by . This book was released on 1976 with total page 1814 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Tongass National Forest N F Scratchings Timber Sale written by and published by . This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book USDA Forest Service General Technical Report PSW written by Pacific Southwest Forest and Range Experiment Station (Berkeley, Calif.) and published by . This book was released on 1976 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book General Technical Report PNW written by and published by . This book was released on 1978 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Research Accomplishments written by and published by . This book was released on 1976 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: