Braided Rivers (Geological Society Special Publication 75) by J. L. Best, C. S. Bristow (editors)

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By J. L. Best, C. S. Bristow (editors)

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Extra resources for Braided Rivers (Geological Society Special Publication 75)

Example text

Thus, if the discrimination between channel patterns is essentially in terms of w/d (as suggested by other theories) then the crux of the issue is finding out what independent variables control w and d. S, suggesting that the braiding theshold for sandbed streams corresponds with some grain-size dependent threshold stream power per unit bed area (cf. Ferguson 1987). However, the exponents in this type of relationship are not likely to apply to gravel-bed streams, and there is much overlap in stream power per unit bed area for natural meandering and braided rivers (Carson 1984b,c; Ferguson 1987).

The anomaly is probably based on Chang's criterion for braiding which is that an increase in S is associated with a large increase in w/d. Remarkably, however, Chang's (1985) region boundaries are lines of approximately equal w/d, and the middle of region (3) (which apparently marks the transition from meandering to braided rivers) has a w/d of 50 which is in close agreement with Fredsoe's (1978) criterion for braiding. Thus, if the discrimination between channel patterns is essentially in terms of w/d (as suggested by other theories) then the crux of the issue is finding out what independent variables control w and d.

7). Such falling stage modification in channel geometry depends on the ability of the flow to erode and deposit. This may not be possible if the bed becomes armored or if shallow parts of channel segments become emergent. The changes in braided channel geometry with falling discharge described above are equivalent to decreasing height and trimming margins of (ancestral) multiple-row alternate bars. Conversely, increasing discharge would result in increasing alternate bar height and the tendency to migrate downstream.

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