Selection of Site-specific Stabilization Techniques
design phase focuses on adequacy. Both of these then determine the effectiveness of the
technique. Many techniques can be designed to adequately solve a specific bank stability
problem by resisting erosive forces and geotechnical failure. The challenge to an engineer is
to determine the most suitable, the most effective solutions to a specific problem, to recognize
which technique matches strength of protection against strength of attack, and which
therefore performs most efficiently when tested by the strongest process of erosion and most
critical mechanism of failure. Environmental and economic factors are integrated into the
selection procedure, but the chosen solution must first fulfill the requirement of being
effective as bank stabilization, otherwise environmental and economic attributes will be
irrelevant.
Application of the concepts discussed in this chapter can be enhanced by considering
the following philosophical suggestions:
Be innovative. Old concepts can be adapted to specific situations in creative
ways, but only if a problem is approached with a creative attitude.
Brainstorming with others is helpful in this regard. However, while
maintaining a creative attitude, do not reinvent the wheel. Learn from others'
experience, then reexamine previous practice creatively.
5.1 EFFECTIVENESS OF ALTERNATIVE APPROACHES
The following factors of effectiveness influence the selection of a bank stabilization
method for a specific project:
Durability;
Adjustment to scour or subsidence;
River depths;
Foreshore limitations;
Channel alignment;
Impact on flowlines; and
Impact on erosion upstream and downstream.
5.1.1 DURABILITY
The following factors should be considered in evaluating the durability of alternative
methods:
Required project lifespan;
Maintenance requirements and capability;
Climatic conditions;
Debris loads, including ice;
Corrosion and abrasion; and
Other hazards.
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