Dinh Van Duy, Nguyen Quang Duc Anh, Nguyen Trung Viet, Hitoshi Tanaka
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This study provides a detailed analysis of the interplay between beach erosion and seawall structures in Loc An, Vietnam, employing both remote sensing and numerical approaches. Sentinel-2 images were employed together with an analytical solution to observe the shoreline change at the Loc An sand spit and to determine input values for the numerical model. Based on the shoreline dynamics, a numerical scheme was employed to study the shoreline evolution after the construction of a seawall. Our findings show that the shoreline evolution can be divided into three stages: (1) The first stage corresponds to the elongation of the sand spit without interference from coastal structures. (2) The second stage shows the effect of jetties on the shoreline, as signaled by the buildup of sand updrift of the jetties. (3) The third stage shows the effectiveness of the seawall, where the shoreline reaches its equilibrium condition. 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引用次数: 0
摘要
海滩侵蚀和海岸保护是一种复杂而又相互关联的现象,对全世界的海岸环境都有重大 影响。在各种海岸保护措施中,海堤已被广泛采用来减缓侵蚀和保护海岸资产。然而,海滩侵蚀与海堤之间的相互关系仍然是一个重要的研究课题,以确保有效和 可持续的海岸管理策略。海堤对海岸线的影响,特别是通过 "端部效应",即海堤的功能类似于海槽,会造成相对于海浪侵袭方向的下漂一侧的侵蚀。本研究采用遥感和数值方法,对越南禄安的海滩侵蚀和海堤结构之间的相互作用进行了详细分析。通过使用哨兵-2 图像和分析解决方案,观测了 Loc An 沙嘴的海岸线变化,并确定了数值模型的输入值。在海岸线动态变化的基础上,采用数值方案研究了修建海堤后的海岸线演变。研究结果表明,海岸线演变可分为三个阶段:(1) 第一阶段为沙嘴伸长阶段,不受海岸建筑物的干扰。(2) 第二阶段是防波堤对海岸线的影响,表现为防波堤上游的沙粒堆积。(3) 第三阶段显示海堤的效果,即海岸线达到平衡状态。这项研究为在测量数据缺乏的情况下估算海岸线扩散率 (ε)提供了一种快速而简单的方法。
Interrelationship between Wall and Beach Erosion in Loc An, Vietnam: Remote Sensing and Numerical Modeling Approaches
Beach erosion and coastal protection are complex and interconnected phenomena that have a substantial impact on coastal environments worldwide. Among the various coastal protection measures, seawalls have been widely implemented to mitigate erosion and protect coastal assets. However, the interrelationship between beach erosion and seawalls remains a critical topic for investigation to ensure effective and sustainable coastal management strategies. Seawalls impact the shoreline, particularly through the “end effect”, where the seawall functions similarly to a groin, causing erosion on the downdrift side relative to the direction of wave approach. This study provides a detailed analysis of the interplay between beach erosion and seawall structures in Loc An, Vietnam, employing both remote sensing and numerical approaches. Sentinel-2 images were employed together with an analytical solution to observe the shoreline change at the Loc An sand spit and to determine input values for the numerical model. Based on the shoreline dynamics, a numerical scheme was employed to study the shoreline evolution after the construction of a seawall. Our findings show that the shoreline evolution can be divided into three stages: (1) The first stage corresponds to the elongation of the sand spit without interference from coastal structures. (2) The second stage shows the effect of jetties on the shoreline, as signaled by the buildup of sand updrift of the jetties. (3) The third stage shows the effectiveness of the seawall, where the shoreline reaches its equilibrium condition. The study provides a quick and simple method for estimating shoreline diffusivity (ε) in situations where measured data is scarce.
期刊介绍:
Water (ISSN 2073-4441) is an international and cross-disciplinary scholarly journal covering all aspects of water including water science and technology, and the hydrology, ecology and management of water resources. It publishes regular research papers, critical reviews and short communications, and there is no restriction on the length of the papers. Our aim is to encourage scientists to publish their experimental and theoretical research in as much detail as possible. Full experimental and/or methodical details must be provided for research articles. Computed data or files regarding the full details of the experimental procedure, if unable to be published in a normal way, can be deposited as supplementary material.