中文摘要：

鉴于强潮、高含沙量的特点，钱塘江强潮河段兴建“闭合式港”，引航道内将会严重淤积，引航道清淤技术是“闭合式港”成败的关键。在引航道底部通过射流掀沙，在引航道导堤上开渠引流把引航道内悬浮泥沙输出，即“射流掀沙引流输沙”技术。通过平面二维数值模拟开渠引流流量大小、引航道及口门处的流态特征，研究引航道内的清淤效果。

英文摘要：

Whereas the strong tide and thick silt concentration in the Qiantang estuary, the approach channel of ＂close-type harbor＂ is serious. The key technique is desilting. Jetting flow is siltation adopted of to raise the suspended silt at the bottom of the approach channel, and trench excavation in the leading dike of the approach channel is implemented to transport the suspended silt out of the approach channel. A planar 2-D numerical model is used to study the effect of jetting desihing on the closed-type harbor basin.