PIANC Smart Rivers 2022

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After the level of the Changshan River channel is upgraded, the water flow conditions in the bridge area of the bridge across the river need to meet the requirements of the regulations to ensure the safety of navigation. At present, the clear width of the navigation holes across the Changshan River Bridge on the Quchang Railway is only about 32.0m. Considering the ship's maneuvering and navigation safety, it is appropriate that the angle between the centerline of the channel and the centerline of the bridge is orthogonal. Under this arrangement, the centerline of the channel near the upstream of the bridge site forms an angle of about 40°with the main flow of the channel, and the ship almost crosses the main flow from the right bank to the left bank, resulting in excessive lateral flow velocity in the channel. The floodplain is distributed in the bridge site area, and the river terrain is relatively open. There are objective conditions to improve the flow field characteristics of the river section through the improvement of the river terrain. The channel on the left side of the bridge site is dredged simultaneously with the channel at 69.1m. When the maximum navigable flow is 800m3/s, the maximum calculated lateral velocity of the bridge site navigation hole is 0.3m/s, and the water depth is 4.06m, which meets the requirements of navigable water flow conditions.

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