Experimental Study on Pneumatic Anti-silting and Silt Reduction in the Tide Gates of Xinyi River Estuary Hub

In the recent years, the problem of sediment deposition under the coastal tidal gate is more prominent. The traditional dredging method is affected by many factors such as season and site conditions, and the dredging effect needs to be improved. Aiming at the problem of siltation under the tide gates of Xinyi River estuary hub, the pneumatic anti-silting and silt reduction was used to carry out field test research and evaluate the effect. The results show that the exhaust gas pressure and nozzle angle are important factors affecting the effect of sediment reduction under the gate, and the exhaust gas pressure is positively correlated with the volume of the scour hole. The nozzle angle of 90° is suitable for the case of small dredging range and deep siltation depth. The nozzle angle of 45° is suitable for the case of large dredging range and medium siltation intensity. Considering the anti-silting effect and economic cost, 2 mm nozzle aperture is more suitable for daily anti-silting work.