Impact of riverine wetlands construction and operation on stream channel stability: Conceptual framework for geomorphic assessment

1990 ◽  
Vol 14 (6) ◽  
pp. 799-807 ◽  
Author(s):  
Bruce L. Rhoads ◽  
Michael V. Miller
Keyword(s):  
Conceptual Framework ◽  
Stream Channel ◽  
Channel Stability ◽  
Riverine Wetlands

scholarly journals A Comprehensive Approach to Monitoring Pipeline River and Stream Crossings

2000 ◽  
Author(s):  
Michelle L. Sorensen ◽  
Craig D. Malcovish
Keyword(s):  
Comprehensive Approach ◽  
The Other ◽  
Aerial Photographs ◽  
River Engineering ◽  
Stream Channel ◽  
Channel Stability ◽  
Regulatory Requirements ◽  
Pipeline Construction ◽  
Channel Characteristics ◽  
Other Hand

There are strict regulatory requirements for pipeline construction at river and stream crossings. The requirements for monitoring, surveillance and maintenance of existing crossings on the other hand are limited to a few lines in Section 10 of CSA Z662-99. Systematic procedures for assessing stream channel stability are not readily available to the operators of pipelines. As a consequence, many monitoring and inspection programs focus more on detecting exposures than on preventing them. In this paper, the AEC Pipelines Ltd. approach to monitoring river and stream crossings is reviewed and discussed. The program involves application of basic geomorphic concepts and use of aerial photographs to define channel characteristics at crossing sites and to determine which crossings may be subject to future channel instability or erosion problems. From these in-house evaluations, decisions are made to either proceed with more in-depth assessments by river engineering specialists or continue with routine aerial and ground surveillance. As part of the overall program, procedures for completing routine channel surveys and a checklist of data to be gathered during regular reconnaissance trips have been developed.

Debris flow triggering by impulsive loading: mechanical modelling and case studies

1992 ◽  
Vol 29 (3) ◽  
pp. 345-352 ◽  
Author(s):  
M. J. Bovis ◽  
B. R. Dagg
Keyword(s):  
Debris Flow ◽  
Case Studies ◽  
Impulsive Loading ◽  
Stream Channel ◽  
Channel Stability ◽  
Coast Mountains ◽  
Debris Slide ◽  
Slide Debris ◽  
Triggering Mechanisms ◽  
Undrained Loading

A mechanism is proposed by which debris flows can be triggered through impulsive loading. Momentum transferred from hillslope failures to steep stream bed materials may be sufficient to initiate a debris flow where one may not otherwise occur. An important parameter in the momentum transfer is the planimetric angle between the slide path axis and the stream channel axis. Preliminary stability equations for both drained and undrained loading are developed from formulae commonly used to assess stream channel stability. Case studies from two basins in the southern Coast Mountains of British Columbia are used to illustrate the mechanisms. Key words : debris flow, triggering, mechanisms, rock slide, debris slide, Coast Mountains.

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