上虞闭合式港船闸引航道水流条件及淤积预测

Prediction of flow condition and siltation in approach channel of closed-type port of Shangyu

闭合式港是处于强潮多沙河口港口建设的新思路,其关键技术问题是引航道的水流条件及泥沙淤积。以钱塘江河口上虞闭合式港为例,采用经验公式及数模计算等方法,分析其引航道的水流条件和淤积强度。结果表明,上虞闭合式港引航道的水流条件可基本满足船舶进出港需求,引航道淤积分布从闸室至口门淤积强度沿程逐渐增加,至口门附近达到最大,从口门向引航道外淤积强度逐渐减小,平均淤积强度约0.06md,可通过“射流掀沙,引流输沙”的技术进行清淤。

The closed-type harbor is a new idea for the port construction in strong tidal and sandy estuary,and the key technical problems are the flow condition and sediment deposition in the approach channel.Taking the Shangyu closed-type port in Qiantang River estuary as an example,we analyze the flow condition and siltation intensity of the approach channel by empirical formula and numerical calculation.The results show that the flow condition of the approach channel at Shangyu closed-type port can basically satisfy the requirements of ships entering and leaving the port.The siltation intensity of the approach channel increases gradually from the navigation lock to the entrance area,and the siltation intensity near the entrance area is maximum.However,it decreases gradually from the entrance to the outside of the approach channel.The average siltation intensity of the approach channel is about 0.06 m d.Jetting flow is adopted 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.