By J. L. Best, C. S. Bristow (editors)
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Extra resources for Braided Rivers (Geological Society Special Publication 75)
1). The flow in confluences is discussed here in terms of three zones (cf. Best 1987): (1) entrance zones; (2) confluence mixing zone where the joining fluid streams become asymptotic and mix; (3) zones of flow separation with vertical axes near inner convex banks at the upstream tip of the confluence and associated with side bars adjacent to the confluence scour. Details of the Fig. 12. Theoretical (see Bridge 1992) distribution of across-stream flow Velocities and bed topography at high and low flow stage for curved channel segment shown in Fig.
27 GEOMETRY, WATER FLOW, TRANSPORT & DEPOSITION Table 4. g. Kirkby 1972, 1977, 1980; Chang 1979, 1985; Bettess & White 1983; reviewed by Ferguson 1987). g. equations for flow resistance and sediment transport rate) to predict equilibrium channel slope, width, depth, and flow velocity. However, to predict channel pattern, the additional assumption of minimum stream power per unit channel length (or minimum S for a given Q) is also required. s-"~'~ ~,"~r %. ~f Hayashi & Ozaki (1980) remains straight.
However, it is difficult to make a strict comparison because in real rivers downstream increases in channel-forming discharge are usually accompanied by decreases in slope and bed grain size, parameters held constant in Ashmore's experiments. Ferguson & Ashworth (1991) show that mean channel width in braided rivers (with braiding index less than 2) varies with discharge, slope and median bed-material size, and that rational regime theories are generally better predictors of channel width than are empirical equations.
Braided Rivers (Geological Society Special Publication 75) by J. L. Best, C. S. Bristow (editors)