Abstract
AbstractThe Baihutan hydro-junction of Changshanjiang River is located in the straight section of S-shaped channel, and the upstream approach channel is located in the concave bank of the bendy section of river. Navigable flow conditions in the entrance area of upstream and the bend connection area are complicated and disordered under the influence of circumfluence. Ships are prone to drift due to the high-speed transverse flow, which makes it difficult to meet the requirements of safe navigation. In the present study, the navigable flow conditions were evaluated by building a 1:80 hydraulic model and the remote-control ship model test were carried out. Besides, flow conditions in the entrance area, the approach channel and the bend connection area were investigated, and optimization and improvement measures were also proposed. Researches indicated that, affected by the water flow at the top of the bend and the narrowed river channel, the transverse and longitudinal flow velocity in the entrance area and the bend connection area were faster. Adjusting the layout of channel to reduce the angle between the mainstream and the axis of the channel, and expanding the cross-sectional area of the approach channel could effectively improve the navigable flow conditions and ensure the navigation safety. The results of this study can provide references for similar rivers.
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