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首页> 外文期刊>Ocean & coastal management >Morphological processes of two artificial submerged shore-parallel sandbars for beach nourishment in a nearshore zone
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Morphological processes of two artificial submerged shore-parallel sandbars for beach nourishment in a nearshore zone

机译：两个人工淹没的岸边平行沙洲在近岸地区的海滩营养形态学过程

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Artificial submerged sandbar is regarded as an assistant structure for beach nourishment with two beneficial functions of protecting beach and supplying sand source. Due to local representative physiognomy of subaqueous sandbars and the aim of longer resident time of beach nourishment, two artificial submerged sandbars parallel to the shore, are implemented at Tiger-Rock Beach, Qinhuangdao, China. It is essential to investigate and identify the systematic morphological implications of artificial submerged shore-parallel sandbars to beach nourishment practice. In this study, a three-level nested flexible triangular unstructured mesh system is set up for a three-dimensional sediment transport and morphological model. The sediment transport and morphological model, driven by coupled tidal currents and waves, is well validated by field measurements. The validated model is used to evaluate the responses of sediment transport and morphological evolution to beach nourishment with two submerged shore-parallel sandbars. The most significant effect of the artificial submerged sandbars is inducing wave breaking (even secondary wave breaking) and forming shadow zones. The artificial submerged sandbars increase westward sediment transport at Public Bathing Place and Specialist Bathing Place, and eastward sediment transport at Langtaoyu Bathing Place. Sediment from sandbars can be transported in three pathways: i) onshore by a wave-induced current due to breaking wave at the crest; ii) longshore due to a longshore current; and iii) seaward by a reversed asymmetrical current. Overall, the sandbars protect beach through forming wave shadow area in their rears with lower wave height and the sediment transport capacity, and supply sediment toward the shore by sacrificing themselves, i.e., sandbars are eroded and have a low-crest asymmetrical shape. The findings in this study contribute to the understanding of morphodynamics of artificial submerged sandbars and can provide a reference for beach nourishment to preserve their eco-friendly nature.
机译：人工淹没沙洲被认为是海滩营养的辅助结构，具有保护海滩和供应沙源的两个有益功能。由于水下沙洲的当地代表性地貌，以及更长的海滩养护时间的目的，在中国秦皇岛的虎岩海滩实施了两个与海岸平行的人工淹没沙洲。研究和确定人工淹没的岸边平行沙洲对海滩营养实践的系统形态学意义至关重要。在这项研究中，建立了一个三层嵌套的柔性三角非结构网格系统，用于三维泥沙运移和形态学模型。由潮汐流和波浪耦合驱动的沉积物迁移和形态模型已通过现场测量得到了很好的验证。验证的模型用于评估两个水下平行沙洲的沉积物迁移和形态演变对海滩营养的响应。人工淹没沙洲的最显着效果是引起波浪破碎（甚至是二次波浪破碎）并形成阴影区。人工淹没的沙洲增加了公共浴场和专业浴场向西的泥沙输送，并增加了浪涛屿浴场向东的泥沙输送。来自沙洲的沉积物可以通过三种途径运输：i）由于波峰处的浪潮而由波浪感应的电流在岸上； ii）由于有近岸海流而成为近岸； iii）通过反向不对称电流向海航行。总体而言，沙洲通过在其后部形成波浪阴影区，降低波浪高度和沉积物的输送能力，从而保护海滩，并通过牺牲自身来向海岸提供沉积物，即，沙洲被侵蚀并且具有低峰的不对称形状。这项研究的发现有助于理解人工淹没沙洲的形态动力学，并可以为保持海滩的生态友好性提供参考。

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