scholarly journals Computer program for the computation of total sediment discharge by the modified Einstein procedure

1985 ◽  
Keyword(s):  
Computer Program ◽  
Sediment Discharge ◽  
Total Sediment

scholarly journals Computations of Total Sediment Discharge, Niobrara River near Cody, Nebraska

Science ◽  
1954 ◽  
Vol 119 (3097) ◽  
pp. 657-658 ◽  
Author(s):  
B. R. Colby ◽  
C. H. Hembree
Keyword(s):  
Sediment Discharge ◽  
Niobrara River ◽  
Total Sediment

scholarly journals Sediment load determines the shape of rivers

2021 ◽  
Vol 118 (49) ◽  
pp. e2111215118
Author(s):  
Predrag Popović ◽  
Olivier Devauchelle ◽  
Anaïs Abramian ◽  
Eric Lajeunesse
Keyword(s):  
Sediment Load ◽  
Sediment Flux ◽  
Sediment Discharge ◽  
Physically Based Model ◽  
Water And Sediment ◽  
Physically Based ◽  
Discharge Regime ◽  
Flux Profile ◽  
Large Discharge ◽  
Total Sediment

Understanding how rivers adjust to the sediment load they carry is critical to predicting the evolution of landscapes. Presently, however, no physically based model reliably captures the dependence of basic river properties, such as its shape or slope, on the discharge of sediment, even in the simple case of laboratory rivers. Here, we show how the balance between fluid stress and gravity acting on the sediment grains, along with cross-stream diffusion of sediment, determines the shape and sediment flux profile of laminar laboratory rivers that carry sediment as bedload. Using this model, which reliably reproduces the experiments without any tuning, we confirm the hypothesis, originally proposed by Parker [G. Parker, J. Fluid Mech. 89, 127–146 (1978)], that rivers are restricted to exist close to the threshold of sediment motion (within about 20%). This limit is set by the fluid–sediment interaction and is independent of the water and sediment load carried by the river. Thus, as the total sediment discharge increases, the intensity of sediment flux (sediment discharge per unit width) in a river saturates, and the river can transport more sediment only by widening. In this large discharge regime, the cross-stream diffusion of momentum in the flow permits sediment transport. Conversely, in the weak transport regime, the transported sediment concentrates around the river center without significantly altering the river shape. If this theory holds for natural rivers, the aspect ratio of a river could become a proxy for sediment discharge—a quantity notoriously difficult to measure in the field.

scholarly journals Computations of Total Sediment Discharge, Niobrara River near Cody, Nebraska

Science ◽  
1954 ◽  
Vol 119 (3097) ◽  
pp. 657-658 ◽  
Author(s):  
B. R. COLBY ◽  
C. H. HEMBREE
Keyword(s):  
Sediment Discharge ◽  
Niobrara River ◽  
Total Sediment
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