Numerical analysis on the influence of sea-crossing bridge engineering on river courses

Given that the construction of sea-crossing bridges may have adverse effects on rivers, a plane two-dimensional hydrodynamic numerical model was established. The model was tested and proven to be valid with the measured data of tide water, and was used to analyze the effects of the engineering on the rise of water level, the changes of flow regime, as well as the depth of riverbed scour. The study indicated that the sea-crossing bridge engineering will cause a slight rise in the backwater height of the rivers. The maximum backwater height is only 6 cm. But the flow regime will vary greatly as numerous vortices will emerge at the vicinity of the bridge location. These influences will result in local scour of the riverbed, and the maximum scour depth is 0.83 m.

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