CGRG Bibliography of Canadian Geomorphology
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Author : Brardinoni, F.
Date : 2002.
Title : Identification of natural and logging-related landslides in the Capilano River basin (coastal British Columbia): A comparison between remotely sensed survey and field survey.
Publication : Terrain Stability and Forest Management in the Interior of British Columbia: Workshop Proceedings. May 23-25, 2001 Nelson, British Columbia, Canada. Edited by: Jordan, P.; and Orban, J. British Columbia Ministry of Forests Forest Sciences. Technical Report
Issue : 003:
Page(s) : 219.
Abstract
In the Pacific Northwest, landslide inventories are routinely compiled by means of aerial photo interpretation.When examining photo pairs, the forest canopy, notably in old-growth forest, hides a population of "not-visible " landslides.The present study attempts to estimate the contribution of landslides not detectable from aerial photographs, to the global mass of sediment production from mass failures on forested terrain of the Capilano River basin.To achieve this,aerial photo interpretation has been coupled with intensive fi eldwork for identifi cation and measurement of all landslides. In order to minimize bias in the comparison and integration of field-collected and air photo-collected data,it was decided to define a 30 -year time window. Results show that not-visible landslides can represent up to 85 %of the total number of failures and can account for up to 30 %of the total volume of debris mobilized.Rate of sediment production differs greatly (one order of magnitude)between two sub-basins of the study area,suggesting that such figures should be generalized with care within a physiographic region - Pacific Ranges of the Coast Mountains. Discrepancies in denudation rate are explained qualitatively by gis -based analysis of slope frequency distributions, drainage density,and spatial distribution of surficial materials.
Bibliography of Canadian Geomorphology