### Abstract

Accurate calculation of secondary flows is critical for the accurate calculation of the sediment transport field in topographically-induced non-uniform flows, and thus the morphodynamic evolution of a river, because the secondary flow can significantly change the direction of the near-bed flow and sediment transport as compared to the vertically-averaged velocity vector. In this study, a non-hydrostatic, free water-surface, three-dimensional, numerical model is developed for flow around a spur dike. The model employs a Body Fitted Coordinate (BFC) system and a moving grid system. These methods enable the model to fit the grid to the boundary during free water surface fluctuations. Turbulence larger than the scale of the grid is modeled by the Large Eddy Simulation (LES) technique. LES integrates the spatially-filtered Navier-Stokes equations, which means that time-fluctuating components of secondary flows are numerically calculated. Model results are compared to those of existing experiments around spur dikes.

Original language | English (US) |
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Title of host publication | River, Coastal and Estuarine Morphodynamics |

Subtitle of host publication | RCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics |

Pages | 921-930 |

Number of pages | 10 |

State | Published - Dec 1 2006 |

Event | 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2005 - Urbana, IL, United States Duration: Oct 4 2005 → Oct 7 2005 |

### Publication series

Name | River, Coastal and Estuarine Morphodynamics: RCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics |
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Volume | 2 |

### Other

Other | 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics, RCEM 2005 |
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Country | United States |

City | Urbana, IL |

Period | 10/4/05 → 10/7/05 |

### ASJC Scopus subject areas

- Ecological Modeling
- Environmental Chemistry

## Fingerprint Dive into the research topics of 'Numerical analysis of secondary-flow around a spur dike using a three-dimensional free water surface LES model'. Together they form a unique fingerprint.

## Cite this

*River, Coastal and Estuarine Morphodynamics: RCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics*(pp. 921-930). (River, Coastal and Estuarine Morphodynamics: RCEM 2005 - Proceedings of the 4th IAHR Symposium on River, Coastal and Estuarine Morphodynamics; Vol. 2).