EXPERIMENTAL STUDY INVESTIGATING THE REDUCTION AND PREVENTION OF SEDIMENT UNDER THE SUZHOU RIVER ESTUARY GATE

摘要

This paper studies sediment reduction and prevention measures under the Suzhou River estuary tidal gate by simulating the processes using a physical model. The newly built estuary tidal gate of the Suzhou River is flap gate with a great span length in China. It lies at the estuary of the Suzhou River border with the Huangpu River. The problem of sediment deposition after the Suzhou River estuary tidal gate has constructed is serious, which influences the safe operation of the tidal gate. The reasons for sediment deposition under the gate include many factors, and the main factors are the extension of the falling tide period and variations of tide waves. For alleviating the sedimentation in the lower approach of the tidal gate, this paper puts forward different measures for reducing and preventing the sediment in different river reaches, and makes use of the physical model results to research the feasibility of measures of reducing and preventing the sediment. The measure for reducing the sediment at the bottom of the gate is the use of jet pipe gate scour silting in cooperation with gate operation. The measure for preventing the sediment silt at downstream reach under the gate is lays aside the rotors in the middle of the river. The rotor is one kind of new installment for reducing and preventing sediment silt. The results indicate that the measures of reducing and preventing the sediment are effective to alleviate the sediment silt in downstream river under the tidal gate.