Countermeasures to Protect Bridge Abutments from Scour (2007) / Chapter Skim
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19 3.1 Introduction This chapter outlines the main concepts employed to mitigate abutment scour and introduces the criteria to be considered when selecting and designing countermeasure concepts. The concepts are evaluated in a preliminary manner here, and the merits of selected concepts are investigated in subsequent chapters that present the results of the laboratory phase of this study.
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of flow-control structures are determined on a site-by-site basis. The layouts sometimes require investigation by means of a hydraulic laboratory model or a two-dimensional numerical model.
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• Aesthetics and environmental issues, and • Cost. It is prudent to mention that scour control can be a tricky process.
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Suitably durable stone should be used. Not all stone is suitable for use as riprap, and some stone has a shorter working life than does other stone; for example, dolomite is not as durable as granite.
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protection against bed material winnowing upward through the filter and riprap and thereby causing undesirable settling. It is necessary, to be sure, that the filter cloth must remain porous, but filter cloths with finer pores typically cost more.
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