Abstract
A physical model of Jiaogang Ship Lock is established in the paper. Through model test, the force of triangular gate under the condition of opening is studied. The result shows when the upper water level is high water control and when absolute value of upper-lower tidal range is less than 0.5m during the spring tide flux and reflux in the flood season of the Yangtze River in the flood year, the ship lock gate can be opened. When the upper water level is medium water control, the absolute value of upper-lower tidal range to open the ship lock gate should be less than 0.4m. And when the upper water level is low water control, the critical tidal range value is also less than 0.5m.
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