莺歌海三莺村岸段人工沙滩工程岸线数值模拟以及模型的验证方法

Shoreline numerical simulation and model verification methods of artificial beach in Sanyingcun bank,Yinggehai

以乐东莺歌海三莺村岸段人工沙滩工程为例,其完工1年后的岸线监测结果,表明需要进一步对人工沙滩后的海滩岸线演变进行研究分析。通过GENESIS岸线演变模型模拟人工沙滩后的岸线变化,并尝试采用3种方法对模型进行验证。经过验证后,对人工沙滩工程后1年、3年、5年岸线变化进行了模拟分析。研究结果表明:GENESIS岸线演变模型对于包围型(拦沙堤和离岸堤结合方式)人工沙滩工程是适用的。工程完工1年后,补沙岸线形成了侵淤变化的凹凸弯曲岸线,侵淤幅度不大,5年后侵淤幅度变缓,开始逐渐趋于平衡。据此,也为人工沙滩后期的养护、补沙防护工作起到重要的参考作用。

This paper presents a case study on an artificial beach project in Sanyingcun bank,Yinggehai.According to measured shoreline results in the first year after the completion of the project,the evolution of the shoreline after the development of the artificial beach needs to be further studied and analyzed.This study uses generalized model for simulating shoreline change(GENESIS)to simulate shoreline changes after the creation of the artificial beach.Then,three methods are used to verify the model.Based on the verified model,this study analyzes the shoreline evolution one year,three years,and five years after the completion of the artificial beach project.Results show that the GENESIS model is applicable for the artificial beach project through a combination of sand-blocking dikes and offshore breakwaters.One year after the creation of the artificial beach,the nourishment shoreline takes a concave–convex form characterized by erosion and siltation changes,but not in a wide range.After five years,the rate of erosion and siltation slows down and gradually becomes balanced.Thus,this study can be an important reference for implementing beach nourishment strategies after the project completion.