PIANC Smart Rivers 2022

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Abstract : *(250~1000 words)

With the development of water transportation industry in China, it is necessary to add emergency navigation lock so as to improve the navigation guarantee rate thanks to ensure navigation during the maintenance period of the ship lock. Furthermore, emergency navigation lock could meet the requirements of flood discharge, and better cope with emergencies (to meet the simultaneous entry and exit of two rescue ships).
Tianma Junction is the second level of the six cascade hydropower stations on Changshan River Shipping Development Project. The emergency navigation lock, a renovation project, is added between the sluice and ship lock with 14 m width and change the original boundary conditions.
In addition, the intersection angle between the main flow and shipping route is large as entrance area of approach channel and the connecting section downstream of Tianma Junction are located on the sharp bend river channel with a turning angle greater than 90°, which causes serious oblique flow velocity. Complicated navigation downstream flow condition seriously threatens navigable safety, therefore, experimental analysis is significant. 
In this paper, hydraulic model with 1/100 scale is employed to analyze the cause of horizontal flow on the basis of the preliminary test of downstream navigable flow conditions with navigation locks, and the comprehensive improvement measures for the optimization of separation levee are proposed. The results show that 90m at the end of the separation levee is changed to 4 diamond-shaped piers, which could introduce flow discharge and spread flow in advance. It has been verified that flow condition with Q<1000m3/s can meet navigation requirements, and the research results can be used as a reference for relevant projects. .

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