PIANC Smart Rivers 2022

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Abstract: Changshanjiang River is a mountain stream river with common characteristics of mountainous rivers such as many bends, shallow water, many beaches and short straight sections, which makes the navigation flow conditions in the entrance area and connecting section of the navigation lock approach channel extremely complicated and special, and it is difficult to meet the requirements of ships entering and leaving the approach channel. Gedi hydroproject is one of the navigation cascade development projects in the mainstream of Changshanjiang River, which is located in the middle of the "S" shaped curved river. The power station, flood discharge gate and ship lock are arranged in sequence from left to right, including 2 power stations with an installed capacity of 4.5 MW and 17 flood discharge gates with a total net width of 238 m. The flood discharge gates are divided into left and right zones by longitudinal guide walls. The ship lock is located on the right side of the project, with a design operating head of 6.0 m. The effective size of the lock chamber is 180.0 m x 23.0 m x 4.0 m (length ×width×threshold depth), designed to be navigable for 500-ton ships. The upstream approach channel is located in the main channel of the concave bank and the semi-open approach channel is adopted. Due to the influence of narrow channel and bend flow near the dam, the upstream approach channel and the entrance area are prone to form oblique flow and backflow area, which has a negative effect on navigation. The entrance area of downstream approach channel is located on the convex bank of the bend, and the angle between the mainstream flow direction and the approach channel is large, the flow conditions of the entrance area and the connecting section of the approach channel are complex, and the velocity index is difficult to meet the navigation safety requirements. Therefore, based on the overall hydraulic model with a scale 1:80, the navigation flow characteristics of the entrance area and the connecting section of the upstream and downstream approach channel are studied, and the optimization schemes were proposed. The results show that: (1) Reasonable optimization of the operation and scheduling mode of the flood gates can greatly improve the navigation flow conditions of the upstream approach channel; (2) The maximum navigable flow can be significantly increased by adjusting and improving the velocity distribution pattern upstream of the project through excavating the upstream left bank;(3) Reasonably dredging of the convex bank along the downstream channel and appropriate adjustment of the route layout of approach channel can effectively improve the flow conditions in the entrance area and connecting section of the approach channel, make the velocity index in the entrance area meet the navigation requirements, and realize the safety navigation.. The research results can provide useful experience for similar projects.

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