Summary of alluvial channel data from flume experiments, 1956-61

Single and superimposed bedforms: a synthesis of San Francisco Bay and flume observations

“…During the past fifteen years, sedimentologists and engineers working with flumes have become better able to define the hydrodynamic conditions under which specific bed phases are stable (Allen, 1963(Allen, , 1968Yalin, 1964;Simons et al, 1965;Guy et al, 1966;Hill, 1966;Raudkivi, 1966;Znamens, kaya, 1966;Harms, 1969;Hill et al, 1969;Kennedy, 1969;Southard, 1971Southard, , 1975Vanoni, 1974). From experiments, these workers have determined what bed phases are stable under specific combinations of depth, velocity, and sediment size, but flow depths have generally been limited to 50 cm or less.…”

The behavior of straight open channels with movable beds

“…Actually, the sediment concentration did increase from 208 ppm to 380 ppm, although the mean particle size declined, Thus, the velocity rose to 1.58 fps (feet per second) rather than to 1.45, which would have resulted if the variation in the sediment concentration had been minimized. The Simons and Richardson experiments using a 0.93 mm sediment also are reported by Guy, Simons, and Richardson (1966). The results of these experiments are shown in figure 34.…”

“…39(7) appear to have such variation in method of flume operation that one run has no specific relation to another. The operation of the flume as described by Guy, Simons, and Richardson (1966) would permit almost anything to happen. Vanoni and Hwang (1967), and Vanoni and Brooks (1957).…”

“…However, this condition seems more likely to be found in the lowvelocity range than in the high-velocity range. In the studies of Guy, Simons, and Richardson (1966, p to more than double and caused the velocity to increase from 1.30 to 1.58 fps." This appears to be a confusion of cause and effect.…”

“…Further information on the behavior of channels at constant depth is shown in figure 41. Simons and Richardson (in Guy, Simons, and Richardson, 1966) studied a 0.33-mm uniform sediment and a mixture having a median diameter of 0.30 mm under a flow of about 0.5-foot depth in a 2-foot flume. As shown in figure 41, there is a considerable difference in the behavior.…”