PIANC Smart Rivers 2022

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Abstract : *(250~1000 words)

With the rapid development of the water transportation industry in China, the scale of ships navigating in the inland waterway is increasing. The water head formed by dams, however, is very high especially for the hydroelectric projects constructed in the upper mountain river. Therefore, it is critically urgent to build a number of high-head and large-scale locks. In this case, when the water head is increased to 60 m, huge water energy could be generated and then introduced into the corresponding lock chamber if the valve operating time is limited. In order to efficiently dissipate the water energy to ensure safe mooring condition for ships during a lock operation, the in-chamber longitudinal culvert system with three-layer side ports was presented in this paper. A three-dimensional CFD model for a 1/4 local region of the corresponding chamber was developed to reveal its hydraulic behavior. The numerical simulations were conducted to examine the effect of the vertical spacing between side ports to the energy dissipation result. Results showed that the good energy dissipation performance was gained when the relative vertical spacing was set d/H=0.25 (H is the inner height of the culvert). Moreover, the energy dissipation mechanism of this arrangement was presented based on the results of three-dimensional hydraulic characteristic. In addition, the corresponding dissipation result of the present arrangement was compared with those of the single-layer and two-layer side ports. The dissipation performance of the present design was found to be the best if all the side ports’ cross-section area of each arrangement keeps the same.

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