PIANC Smart Rivers 2022

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Abstract : *(250~1000 words)

An approach channel is a typically restricted channel connecting the lock head with the upstream and downstream navigation channels, characterized by narrow waters with a closed-end, small coefficient of cross-section, and low speed for vessel navigating. Due to the uncertainty impact of gravity wave induced by flow regulation of cascade reservoirs on the water-level fluctuations in a bifurcated approach channel, the river reach between two dams located along the Yangtze River in China is selected as a study area and the spatiotemporal variations of water-level fluctuating amplitude in a bifurcated approach channel located on the left bank downstream of the TGD are revealed in the context of joint regulation of cascade reservoirs based on physical model tests and numerical simulations. Furthermore, the relationship between water level variation at the lower lock head of the ship lift and the flow regulation of cascade reservoirs is investigated in detail. Results indicated that water level variation of the ship lift approach exhibits an amplifying effect and the lower lock head of the ship lift is a key concern for navigable flow conditions. In addition, the net flow between the TGD and the GZD should not exceed 2000 m3/s and the flow variation rate should be controlled within the range of 2000 m3/15 min in the context of joint regulation of cascade reservoirs, which enables the safe docking of vessels at the lower lock head of the ship lift. The findings may contribute to the design and planning of the newly-planned Three Gorges ship lock approach.

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