中文摘要：

针对我国在滨海河口地区修建的挡潮闸在河口建闸后普遍存在的泥沙淤积问题，根据苏北灌溉总渠入海口六垛南闸等处的实测资料，分析该挡潮闸下潮汐引河通道冲淤特性，指出挡潮闸下引河的潮流特性、潮流挟沙特性及引河淤积的原因。认为对闸门进行科学合理的控制、有效利用上游有限的泄水量和闸下落潮水流拖淤来防淤减淤是较为简便易行且经济的措施。

英文摘要：

In consideration of the sediment deposition in Binhai Estuary after the construction of a tidal barrier gate in this area, an analysis was performed of scouring and silting characteristics in downstream channel of the tidal barrier gate based on the measured data at the Southern Liuduo Gate at ocean outfall of the general irrigation canal in North Jiangsu Province. The characteristics of sediment-laden tidal flow and the cause of channel deposition in the downstream area of the tidal barrier gate were pointed out. It is concluded that the rational control and effective utilization of limited discharge from the upstream and ebb-tide current from downstream area for sediment scouring and desilfing is a simple and economical measure.