淤泥质海岸环抱式港池口门布置方案研究

Analysis of layout scheme of entrance of encircled basin along muddy coast

以资料分析为基础,利用数学模型计算分析的手段,针对当地旋转流和黏性泥沙的运动特性,从水流、泥沙角度对连云港徐圩港区港池布置方案中的口门位置、口门宽度和布置形式进行了论证。分析认为,由于岸滩坡度较缓,大风天破波带影响范围较广,同时被波浪掀起的细颗粒泥沙可被潮流远距离输送,因此从减小泥沙回淤角度来看,港池应采用双环抱形式,而口门应布置在连云港理论基准面高程-5 m(破波区)以外,以此可以降低破波带内悬浮泥沙进入港池和外航道的可能性。同时分析论证认为,初期方案口门不宜过窄,以减小口门的水流强度;口门采用"八字"型布置,可以提高口门航道船舶航行和近口门泊位靠离泊的安全性。上述港池布置方案建议已被设计院接受并在实施方案中体现,可供类似港口布置方案借鉴参考。

Based on analysis of field data, a 2D water-sediment mathematical model for Lianyungang waters is developed to carry out studies of the entrance layout scheme of the encircled basin of Xuwei port from flow and sediment movement aspects. As there have a gentle coastal slope, and there is a greater range acted by the breaking zone waves during windy season, siltation sediment suspended by breaking wave in the breaking zone can be carried by the rotary tidal flow to a long distance, even to the basin or the outer channel. So a double-embay pattern should be chosen as the geometry for the basin in order to reduce siltation in the basin and outer approach under the windy conditions. And the entrance should be located at the place -5 m beyond the breaking wave area to make a reduction of the suspended sediment carried by the breaking wave into the basin and the outer approach. Besides, the width of the entrance should not be too narrow to concentrate intensity flow, especially in primary stage. A V- shaped entrance is recommended to ensure vessels to enter and leave the port safely. The suggestion mentioned above is accepted by the design institution in their construction schemes, therefore it can be taken as a reference for the layout scheme research in the similar ports in the future.