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Author : Douglas N. Swanston
Publisher : Unknown
Page : 628 pages
File Size : 50,5 Mb
Release : 1970
Category : Landslides
ISBN : STANFORD:36105119572563
Author : Douglas N. Swanston
Publisher : Unknown
Page : 24 pages
File Size : 54,5 Mb
Release : 1970
Category : Landslides
ISBN : MINN:31951D029954089
Author : Douglas N. Swanston
Publisher : Forgotten Books
Page : 22 pages
File Size : 43,6 Mb
Release : 2017-10-28
Category : Technology & Engineering
ISBN : 0266892094
Excerpt from Mechanics of Debris Avalanching in Shallow Till Soils of Southeast Alaska During high rainfall periods, the soil becomes saturated, and the seepage zone thickens with substantial increases in flow. The increasing volume of water, moving laterally through the soil as saturated flow, causes a rise in the piezometric surface, with two important consequences: (1) increasing shear stress along potential sliding surfaces caused by rising seepage pressures and increasing unit weight of the soil materials, and (2) decreasing shear resistance resulting from increased pore-water pressure in the soil. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 374 pages
File Size : 45,7 Mb
Release : 1969
Category : Forests and forestry
ISBN : CHI:16098852
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 28 pages
File Size : 53,8 Mb
Release : 1974
Category : Forest ecology
ISBN : PSU:000029030712
Author : Anonim
Publisher : Unknown
Page : 240 pages
File Size : 48,7 Mb
Release : 1989
Category : Soil conservation
ISBN : MINN:31951D02996196T
Author : Anonim
Publisher : Unknown
Page : 1136 pages
File Size : 47,9 Mb
Release : 1990
Category : Forests and forestry
ISBN : CORNELL:31924063065670
Author : Douglas N. Swanston
Publisher : Unknown
Page : 28 pages
File Size : 46,5 Mb
Release : 1974
Category : Forest ecology
ISBN : MINN:30000010192833
Research in southeast Alaska has identified soil mass movement as the dominant erosion process, with debris avalanches and debris flows the most frequent events on characteristically steep, forested slopes. Periodically high soil water levels and steep slopes are controlling factors. Bedrock structure and the rooting characteristics of trees and other vegetation exert a strong influence on relative stability of individual sites. Timber harvesting operations have a major impact on initiation and acceleration of these movements. The cutting of timber itself has been directly linked with accelerated mass movements, and the accumulation of debris in gullies and canyons has been identified as a major contributor to the formation of large-scale debris flows or debris torrents. The limited road construction on steeper slopes thus far has had a relatively small impact. Effective management practices on such terrain consist of identification and avoidance of the most unstable areas and careful control of forest harvesting operations in questionable zones.
Author : Anonim
Publisher : Unknown
Page : 28 pages
File Size : 46,5 Mb
Release : 1974
Category : Forest ecology
ISBN : UOM:39015022555661
Author : A. S. Harris,Wilbur A. Farr
Publisher : Unknown
Page : 120 pages
File Size : 52,7 Mb
Release : 1974
Category : Forest ecology
ISBN : UIUC:30112102049589
Large-scale use of the timber resource of southeast Alaska began in 1953 after long efforts to establish a timber industry. Development and present status of the industry and present management of the timber resource are summarized, stressing the biological basis for timber management activities in southeast Alaska today. Ecological and silvicultural considerations related to timber harvest, reforestation, and stand development are discussed. Published and unpublished information are brought together. Current management practices are discussed as a basis for a better understanding of how this information can be helpful in managing the timber resource and to point out where research is needed.
Author : Pacific Northwest Forest and Range Experiment Station (Portland, Or.)
Publisher : Unknown
Page : 120 pages
File Size : 47,7 Mb
Release : 1974
Category : Forest ecology
ISBN : PSU:000029030736
Author : Max G. Geier
Publisher : Unknown
Page : 234 pages
File Size : 40,8 Mb
Release : 1998
Category : Forests and forestry
ISBN : MINN:31951D028890745
Author : Jerome V. DeGraff
Publisher : Unknown
Page : 112 pages
File Size : 41,5 Mb
Release : 1977
Category : Avalanches
ISBN : OSU:32435066425760
Author : Shou-shan Fan,Yung-Huang Kuo
Publisher : Unknown
Page : 660 pages
File Size : 42,7 Mb
Release : 1991
Category : Sedimentation and deposition
ISBN : MINN:31951D00521601D
Author : Anonim
Publisher : Unknown
Page : 224 pages
File Size : 49,7 Mb
Release : 1977
Category : Forests and forestry
ISBN : MINN:20000003684046