In the present study, the local scour and topographical change in open channels of a tideland dike are studied numerically. A 2D numerical model was presented for the simulation of scour depth in open channels of the tideland dike in the west of the DPR Korea. Because the computation using a 3D numerical model is time-consuming, the depth-averaged 2D numerical model is applied in the calculation of the scour depth. The numerical model is implemented by the method coupled finite element method with finite difference method. Generally, scour depth depends on flow velocity, bed material composition, and suspended sediment concentration. In the present study, as the width of open channel between tideland dikes decreased, the scoured depth dramatically increased due to increased flow velocity. For all the scenarios of damming up, however, the scoured depth increased very slightly in open channels with the width of 50 m. The numerical results showed that when damming up according to Scenario 1, the flow velocity and scoured depth are smallest.
Numerical Simulation of Scour Depth in Open Channels of Tideland Dike, American Journal of Naval Architecture and Marine Engineering.
Vol. 2, No. 4,
2017, pp. 91-98.
Acharya, A. (2011) Experimental study and numerical simulation of flow and sediment transport around a series of spur dikes, D. Sc. Thesis, The University of Arizona.
Afzal, M. S. (2013) 3D Numerical Modelling of Sediment Transport under Current and Waves, M. S. Thesis, Norwegian University of Science and Technology.
Bakhtyar, R., Barry, D. A., Yeganeh-Bakhtiary, A. & Ghaheri, A. (2009) Numerical simulation of surf–swash zone motions and turbulent flow, Advances in Water Resources, 32, 250–263.
Bihs, H. & Olsen, N. R. B. (2008) Three dimensional numerical modeling of pier scour, In Fourth International Conference on Scour and Erosion, ICSE 4, Tokyo, Japan.
Bihs, H. & Olsen, N. R. B. (2011) Numerical modeling of abutment scour with the focus on the incipient motion on sloping beds, Journal of Hydraulic Engineering, 137 (10), 1287–1292.
Cameron, S. M., Nikora, V. I. & Stewart, M. T. (2017) Very-large-scale motions in rough-bed open-channel flow, J. Fluid Mech., 814, 416–429.
Coleman, S. E., Lauchlan, C. S. & Melville, B. W. (2003) Clear-water scour development at bridge abutments, Journal of Hydraulic Research, 41 (5), 521–531.
Comblen, R. et al. (2009) A finite element method for solving the shallow water equations on the sphere, Ocean Modelling, 28 (1–3), 12–23.
Comer, J., Olbert, A. I., Nash, S. & Hartnett, M. (2017) Development of high-resolution multi-scale modelling system for simulation of coastal-fluvial urban flooding, Nat. Hazards Earth Syst. Sci., 17, 205–224.
Crnjaric-Zic, N., Vukovic, S. & Sopta, L. (2004) Balanced finite volume WENO and central WENO schemes for the shallow water and the open-channel flow equations, Journal of Computational Physics, 200 (2), 512–548.
Daoud, A. H., Rakha, K. A. & Abul-azm, A. G. (2008) A two-dimensional finite volume hydrodynamic model for coastal areas: Model development and validation, Ocean Engineering, 35 (1), 150–164.
Dawson, C. & Proft, J. (2004) Coupled discontinuous and continuous Galerkin finite element methods for the depth-integrated shallow water equations, Computer Methods in Applied Mechanics and Engineering, 193 (3–5), 289–318.
Dey, S. (2003) Threshold of sediment motion on combined transverse and longitudinal sloping beds, Journal of Hydraulic Research, 41 (4), 405–415.
Duc, B. & Rodi, W. (2008) Numerical simulation of contraction scour in an open laboratory channel. Journal of Hydraulic Engineering, 134 (4), 367–377.
Dufresne, M. et al. (2010) Classification of flow patterns in rectangular shallow reservoirs. Journal of Hydraulic Research, 48 (2), 197–204.
Guo, J. (2002) Hunter Rouse and Shields Diagram, Advances in Hydraulic and Water Engineering, 2, 1096–1098.
Guo, W.-D., Hong, J.-H., Chen, C.-H., Su, C.-C. & Lai, J.-S. (2017) A Simplified Simulation Method for Flood-Induced Bend Scour – A Case Study Near the Shuideliaw Embankment on the Cho-Shui River, water, 9 (324), 1–19.
Lu, C. N. & Li, G. (2011) Simulations of Shallow Water Equations by Finite Difference WENO Schemes with Multilevel Time Discretization, Numerical Mathematics-Theory Methods and Applications, 4 (4), 505–524.
Meselhe, F. Sotiropoulos, & Jr (1997) Numerical Simulation of Transcritical Flow in Open Channels, Journal of Hydraulic Engineering, 123 (9), 774–783.
Mortlock, T. R., Goodwin, I. D., McAneney, J. K. & Roche, K. (2017) The June 2016 Australian East Coast Low: Importance of Wave Direction for Coastal Erosion Assessment, water, 9 (121), 1–22.
Mullin, T., Shipton, S. & Tavener, S. J. (2003) Flow in a symmetric channel with an expanded section, Fluid Dynamics Research, 33 (5–6), 433–452.
Overduin, P. P., Wetterich, S., Günther, F., Grigoriev, M. N., Grosse, G., Schirrmeister, L., Hubberten, H.-W. & Makarov, A. (2016) Coastal dynamics and submarine permafrost in shallow water of the central Laptev Sea, East Siberia, The Cryosphere, 10, 1449–1462.
Peng, Y., Zhou, J. G., & Burrows, R. (2011) Modelling the free surface flow in rectangular shallow basins by lattice Boltzmann method, Journal of Hydraulic Engineering ASCE, 137 (12), 1680–1685.
Roulund, A., Sumer, B. M., Fredsøe, J., & Michelsen, J. (2005) Numerical and experimental investigation of flow and scour around a circular pier, Journal of Fluid Mechanics, 534, 351–401.
Smith, H. D. (2004) Modeling the flow and scour around an immovable cylinder, M. S. Thesis, Ohio State University.
Török, G. T., Baranya, S. & Rüther, N. (2017) 3D CFD Modeling of Local Scouring, Bed Armoring and Sediment Deposition, water, 9 (56), 1–23.
Tubbs, K. R. & Tsai, F. T. C. (2011) GPU accelerated lattice Boltzmann model for shallow water flow and mass transport, International Journal for Numerical Methods in Engineering, 86 (3), 316–334.
Vikas, S. (2005) Two dimensional sediment transport model using parallel computers, M. S. Thesis, Banaras Hindu University.
Webster, T., McGuigan, K., Collins, K. & MacDonald, C. (2014) Integrated River and Coastal Hydrodynamic Flood Risk Mapping of the LaHave River Estuary and Town of Bridgewater, Nova Scotia, Canada, Water, 6, 517–546.
Wu, W. (2004) Depth-Averaged Two-Dimensional Numerical Modeling of Unsteady Flow and Nonuniform Sediment Transport in Open Channels, Journal of Hydraulic Engineering, 130 (10), 1013–1024.
Zhihe, Z. & Fernedo, H. J. S. (2007) Numerical Simulation of Scour around Pipelines Using an Eulerian-Eulerian Coupled Two-phase Model, Journal of Fluid Mechanics, 7, 121–142.
Zhou, J. G. et al. (2001) The surface gradient method for the treatment of source terms in the shallow-water equations. Journal of Computational Physics, 168 (1), 1–25.
Zhou, J. G. et al. (2002) Numerical solutions of the shallow water equations with discontinuous bed topography, International Journal for Numerical Methods in Fluids, 38 (8), 769–788.
Zhou, J. G. (2011) Enhancement of the LABSWE for shallow water flows. Journal of Computational Physics, 230 (2), 394–401.