Design Methods for In-Stream Flow Control Structures (2014) / Chapter Skim
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Pages 58-63
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From page 58... ...
58 What follows is a discussion on design considerations for instream structures, starting with current practice and expanding to include new design insights based on the results from the ISL, OSL, and VSL3D experiments. These results address three major components of structure installation: angle of orientation, location and spacing, and footer depth.
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59 0 1 2 3 4 5 6 OSL 30 VSL G 20 VSL S 20 VSL G 30 VSL S 30 L Ba nk Pr ot ec o n/ B Lu/B Ld/B Figure 7-1. Angle of orientation of rock vanes compared to the ratio of downstream protected bank, Ld, and upstream protected bank, Lu, for OSL, VSL-G, and VSL-S with a single rock vane at the meander apex.
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From page 60... ...
60 the bank to which it is attached; however, larger angles (30° instead of 20°) produced greater scour depths, which could also create greater risk of structure undermining and failure.
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61 by forcing flow perpendicularly over the weir and shifting the channel thalweg to the stream-wise end of the barbs (Matsuura and Townsend, 2004)
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62 recommendations are made for BW structure installation in meandering channels. • To provide bank protection for a full meander bend, at least three BWs should be used.
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From page 63... ...
63 Three major categories of structure failure mechanism were identified: flanking (circumvention combined with aggradation) , local scour (which can lead to rock displacement)
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