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- W628041338 abstract "A discontinuity occurs in the depth-discharge relation of many alluvial streams. For the higher part of the relation, after the discontinuity, Froude number and Chezy C remain constant For gaged sites, Froude number may be used for the extension of the relation. For ungaged sites, Chezy C may be estimated on the basis of bed-material properties. THE PROBLEM OP RATING ALLUVIAL STREAMS The development of methods for determining the discharge of alluvial streams has been a problem since the beginning of systematic stream gaging in this country. The usual approach is to relate discharge to stage and thus to determine discharge from a record of stage. Inspection of the stage-discharge relation shows that the relation is poor for many streams. On some streams, and particularly on many alluvial streams, an abrupt discontinuity occurs. The Geological Survey began laboratory studies of the mechanics of flow in alluvial streams at Colorado State University in 1956. These studies are conducted by D. B. Simons and E. V. Richardson. One of the primary contributions of the laboratory study has been the definition of the various regimes of configuration of the sand-bed channel. These are described below. Regime of flow Description* Plane bed _ _____ For flow prior to movement Ripples Small, uniform waves, with little sediment movement Dunes Much larger, more irregular waves, with a great deal of turbulence. C-l C-2 STUDIES OF FLOW IN ALLUVIAL CHANNELS Regime of How Descriptions Plane-bed transition-_____ Dunes are smoothed out Both the water surface and the bed are plane, with little turbulence. Standing _______ Both the water surface and the bed are characterized by standing waves, often termed sand waves. Antidunes _ The sand waves move upstream, until at some critical point they break, then reform. DEPTH-DISCHARGE RELATIONS, DISCONTINUOUS RATING CURVES C-3 Idealized diagrams of these various regimes of flow are shown in figure 1. PLANE-BED REGIME PRIOR TO MOVEMENT" @default.
- W628041338 created "2016-06-24" @default.
- W628041338 creator A5049947958 @default.
- W628041338 date "1961-01-01" @default.
- W628041338 modified "2023-09-26" @default.
- W628041338 title "Depth-discharge relations of alluvial streams -- discontinuous rating curves" @default.
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- W628041338 doi "https://doi.org/10.3133/wsp1498c" @default.
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