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| Titel |
Generic 2-D River Network Modeling of Flow and Sediment Transports |
| VerfasserIn |
W. Guo, C. Wang, X. Xiang, T. Ma |
| Konferenz |
EGU General Assembly 2012
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250058800
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| Zusammenfassung |
| A generic 2D river network model of flow and sediment transports is proposed for the flow
and sediment simulation in the complex river network. The paper expands the three-step
method adopted in the 1D river network to the 2D river network simulation. A 2D river
network model is divided into several cells, including single river cell, “tree-like” river cell,
“ring-like” river cell and “cross-like” river cell, which can reflect the interactive
influence of flow field in the bifurcated channel and applies to generic 2D simulation.
Based on equation of the 2D shallow water and unsteady non-uniform suspended
sediment, the relationship between the variables (water level, discharge and sediment
concentration) of each section and those of the boundaries are obtained through the
full implicit matrix chase-after method. Through the conservation of water and
sediment on the boundaries, the water level and sediment concentration on the
nodes can be got by solving the irregular sparse matrix of conservation equation, so
as to implement the coupled simulation of flow and sediment in the whole river
network.
The paper take the Chengtong River Reach located in the low reaches of Yangtze
River as the example of “cross-like” river to verify the algorithm. The model is
calibrated using the measured data. A comparison of calculated water level, discharge
and sediment concentration shows that the generic model can reflex the interactive
influence of flow field, with reasonable accuracy, especially in the bifurcated channel. |
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