日照港退岸还海项目人工沙滩拦沙堤布置研究

平直岸线建设人工沙滩时,在没有掩护条件下,通常会在波、流的作用下形成单向的持续输运,人工沙滩难以存留。文章以日照港退岸还海项目为例,基于抛物线型岬湾平衡岸线理论,通过数学模型试验确定了沙滩的铺沙范围和南拦沙堤的布置方案。同时,针对侵蚀比较严重的北侧和中部位置对比分析中部挡沙堤、离岸岛堤、北部拦沙堤等不同的掩护形式的景观性和对泥沙运动的影响,比选出设置北拦沙堤进行掩护,以沙滩流失量和稳定岸滩宽度作为主要指标,通过物理模型试验进一步确定了北侧拦沙堤的布置方案,并对拦沙堤的整体布置进行了验证。

Study on arrangement of debris dam in artificial beach for returning port shoreline to beach project in Rizhao Port

When constructing an artificial beach on a straight coastline,under the condition of no cover,it will often form a one-way continuous transport under the action of waves and currents,so that the artificial beach is difficult to survive.Taking the returning port shoreline to beach project in Rizhao Port as an example,and based on the parabolic cape-bay equilibrium coast theory,the sanding extent of the beach and the appropriate length of the south debris dam were determined by mathematical model tests.At the same time,as to the comparatively severely eroded northern and central locations,after comparing and analyzing the landscape of the central debris dam,offshore island embankment,the north debris dam and their impact on sand movement,the north debris dam for cover was chosen.Taking the amount of sand loss and the width of the stable bank as the main indicators,the layout scheme of the north debris dam was further determined through physical model tests,and the overall layout of the debris dam was verified.