粉沙质海岸潜堤防淤减淤机理研究

项目名称： 粉沙质海岸潜堤防淤减淤机理研究

项目编号： No.51209111

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 水利科学与海洋工程学科

项目作者： 严冰

作者单位： 交通运输部天津水运工程科学研究所

项目金额： 25万元

中文摘要： 随着港口向大型化、深水化发展，粉沙质海岸航道淤积问题日益突出，潜堤作为一种可行的防护形式备受关注。潜堤防淤减淤是一个极为复杂的问题，涉及到波浪破碎、泥沙沉积等一系列问题，目前对其机理认识的不足与日益增长的工程需求之间的矛盾越发突出，亟需开展相关研究。本项目拟利用新型数值模拟手段和实验手段围绕潜堤作用下泥沙起动、穿越、沉降等输运过程开展机理研究工作，利用拉格朗日方法在描述强烈对流水环境条件下泥沙运动的优势，建立和开发基于浓度概念的光滑粒子动力学泥沙输运模型，从机理角度揭示潜堤结构形式、水动力条件与泥沙输运现象之间的内在关系，沟通当前不同研究成果之间的分歧，探索潜堤防淤减淤机理，为潜堤在工程实践中发挥更大的作用奠定研究基础。

中文关键词： 粉沙质海岸；潜堤；光滑粒子动力学；航道淤积；波浪

英文摘要： The sediment deposition at offshore dredged channels on silty coast is severe more and more on the development of the harbors. Recently, submerged dikes have become more common as protection structures due to their advantages. However the inconsistency between the requirement in engineering and shortage in sediment transport mechanism protected by submerged dikes becomes prominent because of the complication of the process. So this project plans to study this sediment transport problem by the mathematic model and physical model. The Smoothed particle hydrodynamics method is chosen due to its meshfree, Lagrangian and particle nature. A mathematic model will be established with a concentration model by the SPH method to simulate sediment deposition, suspension, bed changes and scour with a submerged dike. This research is helpful for understanding the mechanism of mitigation of siltation in channel prevented by the submerged dike on silty coast.

英文关键词： silty coast；submerged dike；smoothed particle hydrodynamics；channel siltation；wave