Sediment Transport in Shallow Flow on an Impervious Surface
1991
Smith, Marvin W | Jr
Sediment transport in the overland flow on an impervious surface has been studied to gain understanding of this process in shallow flow on a nonerodible boundary. Such a case occurs in stormwater flow over concrete and asphalt pavements of roads, parking lots and airports. The term sediment can include soil, rubber residue from aircraft tires, brake lining residue, paint flakes, and other particulate matter. Previous and current research has been reviewed in order to gain an understanding of the process of sediment transport. Existing mathematical models have also been reviewed in an attempt to find one which can be modified to give predictions on the transport of sediment in this case. Three velocity distributions (parabolic, logarithmic, and power) are employed with a varying sediment diameter to depth ratio in order to account for the effect of the sediment particle on the velocity distribution profile. The Shields diagram and previously established plots of the drag coefficient versus Reynolds number for a sphere are used to approximate the case of incipient motion of a particle in steady uniform and nonuniform shallow flow. An approximate, theoretically based mathematical procedure is derived to estimate this process.
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