基于平面二维潮流模型的北仑河口悬沙输运与底床冲淤数值模拟  

Numerical simulation of suspended sediment transport and seabed change in the Beilun Estuary based on a two-dimensional tidal current model

作　　者：董德信[1] 陈波[1] 李谊纯[1] 陈宪云[2] 张荣灿[2] 

机构地区：[1]广西科学院广西近海海洋环境科学重点实验室,广西南宁530007 [2]广西科学院广西北部湾海洋研究中心,广西南宁530007

出　　处：《热带海洋学报》2013年第6期16-21,共6页Journal of Tropical Oceanography

基　　金：国家自然科学基金(40766001);广西自然科学基金重大项目(2010GXNSFE013001;2012GXNSFEA053001)

摘　　要：为研究自然因素所导致的北仑河口地形改变状况,建立一个平面二维潮流泥沙数值模型,采用有限体积法数值求解,运用实测水文泥沙资料对模型进行率定、验证。结果表明,模型较好地复演了河口的潮流、悬沙运动过程。在此基础上,对河口的悬沙输运和底床冲淤变化进行分析计算,结果显示:夏初时节河口的悬沙含量较小,约3—70mg·L 1,落潮含沙量大于涨潮含沙量;除局地冲淤达0.05m·a 1外,大部分区域冲淤变化不超过0.05m·a 1,河口处于微冲微淤的动态平衡。To study the seabed change in the Beilun Estuary caused by natural factors, a two-dimensional current sediment numerical model is set up using the finite volume numerical method. This numerical model is validated by the measured hydrological and sediment data. The results show that the model is able to effectively simulated the movements of current and suspended sediment. We also calculate and analyze the suspended sediment transport and seabed scour of the estuary. The results reveal that the suspended sediment concentration is small in early summer, about 3-70 mg·L-1, and the sediment concentration during the ebb tide is larger than that during the flood tide. The changes of erosion and deposition in most regions are no more than 0.05 m·a-1. The estuary is in a dynamic balance of little erosion or deposition.

关 键 词：北仑河口 潮流泥沙模型 有限体积法 悬沙输运 底床冲淤 

分 类 号：P731.2[天文地球—海洋科学] P737.121