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Extensive data concerning water discharge and suspended-sediment transport for many sand-be*d cross sections in the middle Rio Grande basin are analyzed. A discontinuity in the velocity-hydraulic-radius relations of these reaches is shown to occur, with velocity doubling for a constant depth. The roughness parameter, Chezy C, is relatively constant for discharges beyond the discontinuity, and mainly is a function of the size of bed material. A discontinuity in the hydraulic-radius suspended-sand loads relation is shown to coincide with the discontinuity in depth discharge. Suspended-sand loads increase 8 to 10 times for a constant depth at the point of discontinuity. The mechanics of scour and fill are studied, and it is indicated that contracted sections of a reach generally will scour on a rising stage and fill on the recession. The stream system apparently operates so as to maintain a constant energy gradient through a reach. The suspended-sediment data for the middle Rio Grande are used to compute total loads according to the modified Einstein and the Bagnold methods. The modified Einstein method gives consistent results when applied to different cross sections of a single reach. The Bagnold method apparently predicts a correct shape for the shear-transport relation, but it is not as suited to field use at this time as is the modified Einstein method.

A study of fluvial characteristics and hydraulic variables middle Rio Grande, New Mexico