Abstract
The characteristics of flow in a reach of alluvial channels on the Elkhorn River were observed. The variations in channel width, bed elevations, bed configurations, and roughness coefficients are described and related to certain hydraulic parameters previously defined in laboratory and field studies of flow in alluvial channels. INTRODUCTION A better understanding of the relationship of discharge to depth and slope in alluvial channels was sought through observations on a reach of channel of the Elkhorn River in Nebraska. Measurement of bed elevation, velocity, and slope were obtained for 45 different flow events during the period 1951-56. Several determinations of size of bed material and suspended-sediment concentration were also made. The hydraulic relationships in alluvial channels are complex because the configuration and elevation of the channel bed are unstable. It is recognized that general principles cannot be established from the history of events in a single reach in which slope and size of bed material are virtually constant. Laboratory studies during recent years have defined the regimes of bed configuration and the primary variables which determine flow depth. However, the results of laboratory studies cannot yet be applied to natural streams because the relationships of model to prototype flow of water-sediment mixtures is imperfectly understood. Studies of the mechanics of flow in natural channels should contribute towards a better understanding of these relationships. The hydraulic characteristics of the Elkhorn reach are described in this report. Certain analyses of the data are presented in order to make comparisons with the results of laboratory and field studies previously published in the literature. DESCRIPTION OF REACH A reach 1,670 feet long on the Elkhorn River at King Lake Camp about 2 miles northwest of Waterloo, Nebr., was selected for investiB-l B-2 STUDIES OP PLOW IN ALLUVIAL CHANNELS EXPLANATION Gages Gages and cableways 100
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