Evaluation of Total Sediment Transport Model in the Simulation of Morphodynamics in Two Different Hydrodynamic Settings
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 148, Issue 6
Abstract
The bed level change in rivers and estuaries due to several dynamic parameters such as tide, waves, river discharge, and wind is a common problem. The current practice is to predict the changes through numerical modeling and compare it through field measurements. The empirical relations to be adopted for the sediment transport estimation form an integral part of morphodynamic models. In this study, five different total sediment transport formulae have been incorporated in the morphodynamic routine of a circulation model. The hydrodynamic model accounts for tide-induced flows, tide being the dominant forcing in the estuaries considered for the study. The preceding sediment transport formulae for predicting bed level changes (erosion and accretion) are subjected to an assessment, through statistical approaches, to find the most suitable formula for different hydrodynamic settings of a macrotidal estuary (Hooghly) and a microtidal estuary (Cochin). The results are validated with the field measurements and finally the appropriate empirical formula is designated based on a detailed analysis. The AW model outscores in the Brier skill score (BSS) analysis and thus qualifies to be most suited sediment transport model for the macrotidal estuarine dynamics with a score of 0.55, and the AW model is followed by the VR model with a score of 0.52. As per BSS, the EH model falls under the Good model category with a score of 0.48, for the microtidal estuary and thus qualifies to be the better suited sediment transport model among the models considered.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Notation
The following symbols are used in this paper:
- Agr
- magnitude of inception of motion;
- B
- baseline measured bathymetry;
- C
- value related to dimensionless particle size number;
- Cd
- drag coefficient;
- D*
- dimensionless particle size number;
- D
- particle size in m at which 35 percent by weight of the bed material is finer;
- D50
- median grain size in m;
- Fgr
- particle mobility number;
- fn
- sediment fraction;
- Ggr
- sediment transport parameter;
- g
- acceleration due to gravity-m/s2;
- h
- flow depth in m;
- k
- factor of proportionality;
- MSE
- mean square error;
- m
- value related to dimensionless particle size number;
- n
- value related to dimensionless particle size number;
- qb
- bed transport load in m3/s/m;
- qs
- suspended sediment load in m3/s/m;
- qt
- volumetric total sediment transport load in m3/s/m;
- s
- specific gravity of sediment;
- u
- water flow velocity in m/s;
- u*
- friction/shear velocity in m/s;
- u*c
- critical friction/shear velocity;
- ucr
- critical flow velocity in m/s;
- ws
- settling velocity m/s;
- X
- evolved measured bathymetry;
- Y
- predicted bathymetry;
- δ
- measurement error;
- ρ
- density of water in kg/m3;
- ρs
- density of solids in kg/m3;
- τb
- bed shear in N/m2; and
- τcr
- critical shear in N/m2.
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Received: Feb 24, 2022
Accepted: Jul 8, 2022
Published online: Sep 9, 2022
Published in print: Nov 1, 2022
Discussion open until: Feb 9, 2023
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