海滩养护和修复工程的动态平衡滨线设计研究——以浙江省苍南县炎亭湾海滩修复工程设计为例

Study on the plan of dynamic equilibrium shoreline for beach nourishment and restoration——Taking the plan of the beach nourishment in Yanting Bay,Cangnan County,Zhejiang Province as an example

以浙江省苍南县炎亭湾海滩修复为例,基于"CERC"的沿岸输沙率计算公式,建立了一套依据工程区近滨波浪场分布进行动态平衡滨线设计的方法,包括独立输沙单元海滩和非独立输沙单元海滩2种滨线形态设计方法.研究发现:在海滩养护和修复工程中,依据动态平衡滨线设计方法对滨线走向进行科学论证是十分必要的;独立输沙单元的海滩可以视为沿岸输沙率为零的非独立输沙单元的海滩,前者海滩平衡滨线的布设是后者平衡滨线布设的一种特例;相较于"静态岬湾海滩概念(SBBC)"模型,本研究提出的动态平衡滨线设计方法更具优势,该方法可用于大多数海滩的平面形态设计.

The plan of the dynamic equilibrium shoreline for a new beach is a key technique in beach nourishment and restoration. The Wave Energy Flow Method based on the equation of CERC is used to calculate the longshore sediment transport rate in this paper. By using this theory,a set of processes and a new model for relevant mathematical calculation,including dynamic equilibrium shoreline computational processes and layout method of an independent sediment transport unit and an non-independent one（one end sand in,and the other sand out） are established,taking the plan of the beach nourishment in Yanting Bay,Cangnan County,Zhejiang Province as an example. Compared with the dynamic equilibrium conceptual model and the static bay beach concept（SBBC） model,the plan of the dynamic equilibrium shoreline for beach nourishment and restoration is more suitable and realistic to the actual sediment transport of general sandy beach. It is of wide applicability.