Abstract
In this study, using the modified Einstein procedure, data on sediment load were systematically collected and analyzed by year, period, watershed, and main stream and tributaries in South Korean rivers. It was found that the sediment load and concentration differ significantly depending on the region, even in the same area and at the same time, especially in areas with a large minimum-maximum discharge ratio. Therefore, the application of the relationship between discharge and sediment load across all time and space needs to be precise, and data have to be selected separately according to the relational application conditions. In addition, existing sediment transport formulas were compared by applying various goodness-of-fit methods that were well suited to the measured dataset. The results showed that the optimal sediment transport formula varied according to the goodness-of-fit method. Furthermore, while the Ackers and White approach was found to be generally suitable; however, the correlation figures alone were not conclusive. Therefore, a quantitative determination must be made as to how the application of simple fitness methods affects the selection of optimal sediment transport formulas.
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Abbreviations
- a :
-
Reference level
- C a :
-
Reference concentration
- c B :
-
Unity for laboratory data and 1.268 for field data
- C ppm :
-
Total sediment concentration in parts per million by weight
- C w :
-
Sediment concentration by weight
- d * :
-
Dimensionless particle diameter
- d s :
-
Grain size
- F :
-
Correction factor for suspended load
- G :
-
Specific gravity of sediment
- g :
-
Gravitational acceleration
- h :
-
Flow depth
- n :
-
Number of data points
- P :
-
Error
- Q :
-
Flow discharge
- Q s :
-
Total sediment load
- q s :
-
Total load transport per width
- q sb :
-
Bed-load transport per unit width
- q ss :
-
Suspended load transport per unit width
- R :
-
Discrepancy ratio
- r :
-
Correlation coefficient
- \(\bar R\) :
-
Mean discrepancy ratio
- R h :
-
Hydraulic radius
- S f :
-
Friction slope
- T :
-
Transport stage parameter
- ū :
-
Mean flow velocity
- u * :
-
Shear velocity
- \(u_ \ast ^\prime \) :
-
Bed-shear velocity related to grains
- u *,cr :
-
Critical bed-shear velocity according to Shields
- V :
-
Depth-averaged velocity
- V c :
-
Average flow velocity at incipient motion
- VS :
-
Unit stream power
- VS/ω :
-
Dimensionless unit stream power
- x i :
-
Actual value
- y i :
-
Estimated value
- σ :
-
Standard deviation
- σ g :
-
Geometric standard deviation of the bed material
- \({\tau _{{ \ast _c}}}\) :
-
Shields dimensionless critical shear stress
- υ :
-
Kinematic viscosity
- ω :
-
Settling velocity
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Acknowledgments
This research is part of Eun-Kyung Jang’s doctoral dissertation in 2017 from Myongji University and supported by Korea Institute of Civil Engineering and Building Technology (Project Number: 20210485).
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Jang, EK., Ji, U. Sediment Load Characteristics in South Korean Rivers and Assessment of Sediment Transport Formulas. KSCE J Civ Eng 25, 4646–4660 (2021). https://doi.org/10.1007/s12205-021-1070-1
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DOI: https://doi.org/10.1007/s12205-021-1070-1