Formulating Fine to Medium Sand Erosion for Suspended Sediment Transport Models
Abstract
:1. Introduction
2. Methods
2.1. 1DV Model
2.1.1. Advection-Diffusion Equation
2.1.2. Deposition Flux
Bottom Boundary Layer Model and Near-Bed Concentration
2.1.3. Suspended Sediment Horizontal Flux
2.1.4. Erosion Fluxes
2.2. Transport Rate Validation Strategy
Abbreviations | References |
---|---|
Erosion flux formulations used with Siam 1DV | |
Siam-ERODI | [23] |
Siam-VR84 | [21] |
Siam-EF76 | [25] |
Siam-ZF94 | [31] |
Current only transport formulation | |
EH67 | [37] |
Y73 | [38] |
VR84 | [39] |
Sediment transport formulations used by Davies et al. [19] | |
STP | [40] |
TKE | [41,42] |
BIJKER A | [43,44] |
SEDFLUX | [1,45,46] |
Dibajnia Watanabe | [47] |
TRANSPORT | [48] |
Bagnold-Bailard | [49,50] |
Sediment transport formulations used by Camenen and Larroudé [51] | |
Bijker | [52] |
Bailard | [50] |
van Rijn | [53] |
Dibajnia Watanabe | [47] |
Ribberink | [54] |
Sediment transport data | |
krammer | [55] |
scheldt | [55] |
alsalem | [56,57] |
janssen | [58] |
dibajnia | [47,59] |
2.2.1. Current Only
2.2.2. Wave and Current
Forcing | Hs (m) | T (s) |
---|---|---|
Current only | 0 | |
Current + wave 1 | 0.5 | 5 |
Current + wave 2 | 1 | 6 |
Current + wave 3 | 2 | 7 |
Current + wave 4 | 3 | 8 |
3. Results
3.1. Evaluation of the 1DV Model Transport Rates in the “Current Only” Case
3.2. New Empirical Formulation of Erosion Flux
3.3. Validation of the New Erosion Flux Formulation
3.3.1. Overall Performance
Model | Cc50: Current only | Cw50: Wave + Current |
---|---|---|
Bijker [52] | 66 | 18 |
Bailard [50] | 82 | 35 |
van Rijn [53] | 70 | 45 |
Dibajnia Watanabe [47] | 84 | 48 |
Ribberink [54] | 60 | 45 |
Siam 1DV + erosion law (this paper) | 67 | 37 |
3.3.2. Validation for Varying Grain Size
3.3.3. Validation for Varying Hydrodynamic Conditions
3.4. Relevance of Analytical Refinements in the Bottom Layer
4. Discussion
- Bed load has not been accounted for in our model. For the experiment leading to Figure 2, adding the bed load in the model leads to the same conclusion. For instance, using VR84, which gives both suspended load and bed load, it appears that, whatever the velocity, the bed load only accounts for 6%–22% of the total transport from the finer to the coarser sand (following VR84, the ratio of the suspended load to the total load is independent of the velocity). Moreover, for the “current only” experiment (Figure 2), the ratio is always greater than one, which means that the suspended load is the predominant mode of transport [61]. The bed load is therefore not expected to explain the discrepancies observed when using classical erosion flux formulations, at least for this experiment.
- The 1DV model could suffer from weaknesses, mostly in the way the boundary layer is formulated. It is for instance not fully clear if the Rouse profile holds very close to the bottom. Different tests were conducted with varying parameterization (reference height, hindered settling velocity or the parameterization of vertical mixing were modified) and led to the same conclusion. A simple Rouse concentration profile (assuming a single bottom boundary layer) has also been tested, but did not enable us to match the total flux range given by engineering models. Further, we cannot take into account the impact of sediment concentration on settling velocity near the bottom in the model. This is due to the fact that we are using an analytical solution for the bottom layer of the model (a Rouse profile), which is only valid for constant settling velocity (with depth). We acknowledge that this could induce biases in the transport rates computed by the model.
- The erosion fluxes proposed in the literature could be inconsistent with our modelling strategy. We suggest here that this hypothesis is the most relevant one. Our approach was thus to search for an empirical erosion law able to produce results that match the horizontal flux range given by empirical engineering models.
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
Appendix
A. Bottom Shear Stress Calculation
B. Bedform Predictor
C. Erosion Flux Formulations
D. Sand Transport Formulations
E. Determination of the erosion flux formulation
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Dufois, F.; Hir, P.L. Formulating Fine to Medium Sand Erosion for Suspended Sediment Transport Models. J. Mar. Sci. Eng. 2015, 3, 906-934. https://doi.org/10.3390/jmse3030906
Dufois F, Hir PL. Formulating Fine to Medium Sand Erosion for Suspended Sediment Transport Models. Journal of Marine Science and Engineering. 2015; 3(3):906-934. https://doi.org/10.3390/jmse3030906
Chicago/Turabian StyleDufois, François, and Pierre Le Hir. 2015. "Formulating Fine to Medium Sand Erosion for Suspended Sediment Transport Models" Journal of Marine Science and Engineering 3, no. 3: 906-934. https://doi.org/10.3390/jmse3030906
APA StyleDufois, F., & Hir, P. L. (2015). Formulating Fine to Medium Sand Erosion for Suspended Sediment Transport Models. Journal of Marine Science and Engineering, 3(3), 906-934. https://doi.org/10.3390/jmse3030906