长江口横沙浅滩挖入式港池方案泥沙回淤估算  

Estimation of the sediment siltation in the planned excavated-in harbor in the Hengsha Shoal of the Yangtze Estuary Estuary

作　　者：葛建忠[1] 金鏐[2] 丁平兴[1] 邵荣顺 虞志英[1] 郭文云[1] 

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200062 [2]交通运输部长江口航道管理局,上海200003 [3]中交第三航务工程勘察设计有限公司,上海200032

出　　处：《华东师范大学学报（自然科学版）》2013年第4期106-119,共14页Journal of East China Normal University(Natural Science)

基　　金：华东师范大学河口海岸学国家重点实验室自主课题

摘　　要：针对横沙浅滩挖入式港池建设和维护中核心的泥沙回淤问题,本文采用海港水文规范、底切应力公式和纳潮总量估算等多种不同方法对横沙挖入式港池规划方案中的港池和外航道泥沙回淤问题进行预估,其结果较为一致.若港池出口位于-7 m泥沙浓度0.3 kg/m3的区域,港池年回淤量约为2 000万～2 200万m3,平均回淤强度约为0.3～0.4 m/a;外航道平均淤积强度约为0.3～0.4 m/a,年回淤600万～1 200万m3.且回淤分布主要集中在近靠港池口4～6 km的区域.计算表明,港池口若设于泥沙浓度更低的深水区域,泥沙回淤将显著降低.Several different methods, including algorithm of siltation estimation in state regula- tion of port and waterway, bottom shear stress model and tide prism estimation, were used to make prediction for sedimentation siltation in the proposed excavated in harbor, which would be located in the Hengsha Shoal to improve the shipping capacity in the Changjiang Estuary. The results from these methods turns out to be consistent. The overall load and strength of sediment siltation for condition of basin gate at - 7 rn depth and 0.3 kg/m3 sediment concentration is 2.0 × 107 -2.2 × 107 m3 and 0.3-0.4 m/a in the basin and 0.6 × 107 -1.2 × 10^7 m3 and 0.3-0.4 m/a in outer shipping channel. And the maximum siltation mainly centralizes near the basin gate with a distance of 4 ~6 km. And the prediction indicates the siltation will be significantly de- creased if the basin gate moves deeper with lower suspended sediment concentration.

关 键 词：挖入式港池 横沙浅滩 泥沙回淤 

分 类 号：P751[交通运输工程—港口、海岸及近海工程]