Simplified methods for computing total sediment discharge with the modified Einstein procedure

1957 ◽  
Author(s):  
B.R. Colby ◽  
D.W. Hubbell
Keyword(s):  
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

scholarly journals Hydro-sedimentological computational tool: case study of the Mogi-Guaçu SHP (Brazil-SP)

2019 ◽  
Vol 23 ◽  
pp. 40
Author(s):  
Bruno Bernardo dos Santos ◽  
Renato Billia de Miranda ◽  
Tainá Thomassim Guimarães ◽  
Carlos Eduardo Nunes Medina Martinez ◽  
Cláudio Bielenki Júnior ◽  
...  
Keyword(s):  
Water Resource Management ◽  
Visual Basic ◽  
Estimation Methods ◽  
Sediment Discharge ◽  
Energy Matrix ◽  
Computational Tool ◽  
Visual Basic For Applications ◽  
Using Data ◽  
Total Sediment

The hydro-sedimentological studies are complex and of great importance, mostly in countries with large amounts of water resources and with its energy matrix predominantly hydraulic. The assessment of the amount of sediment carried through water bodies is more difficult mainly due to the amount of involved quantities, which require the adoption of probabilistic or deterministic estimation methods. In this context, this paper presents a case study that applies the hydros-sedimentological module from the computational tool NH Statistic and Sediment, developed by one of the authors, written in Visual Basic for Applications to determine total sediment discharge  using data from the Mogi-Guaçu Small Hydro Electric Power Plant (SP-Brazil). Among the surveys, the reduction of total sediment discharge was verified, which was expected. Likewise, the results provided by the developed computational tool were compared to the results of other softwares showing minimal differences, giving validity and consistency to the applied method. It’s worth mentioning that the method used in this case study may be replicated in other places, giving more information to assist the water resource management.

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