Cabezas-Rabadán C, Pardo-Pascual J E, Palomar-Vázquez J, Cooper A
Geo-Environmental Cartography and Remote Sensing Group (CGAT), Department of Cartographic Engineering, Geodesy and Photogrammetry, Universitat Politècnica de València, Camí de Vera S/N, València, Spain.
CNRS, University of Bordeaux, Bordeaux INP, EPOC, UMR 5805, 33600, Pessac, France.
Sci Rep. 2025 Jan 23;15(1):2955. doi: 10.1038/s41598-025-86485-y.
High costs and project-based (short-term) financing mean that coastal engineering projects are often undertaken in the absence of appropriate post-construction monitoring programmes. Consequently, the performance of shoreline-stabilizing structures or beach nourishments cannot be properly quantified. Given the high value of beaches and the increase in erosion problems and coastal engineering responses, managers require as much accurate data as possible to support efficient decision-making. This work presents a methodological approach to characterise coastline position changes as a result of engineering actions. We describe a new, low-cost method based on satellite remote sensing to monitor shoreline evolution at high temporal and spatial resolution pre-, during and post-implementation. Initially, satellite-derived waterlines are identified and extracted from publicly available satellite imagery of the Landsat 5, 7, 8, and 9, and Sentinel-2 constellations using the automatic shoreline extraction tool SHOREX. The waterline positions are then compiled, differences over time are quantified, and a matrix is constructed that allows easy depiction and interpretation of spatial and temporal patterns of erosion/accretion. This allows the access and the comprehension of the morphological data by the non-expert. Two examples of application on the Valencian coast of Spain at different spatial scales demonstrate how beach response to coastal engineering actions can be characterised at different levels of detail (from local to regional) and over different periods of time. These applications evidence the utility of the approach as it allows analysis of pre- and post-intervention coastal change and offers a means to overcome the widespread lack of monitoring and hence to improve coastal engineering practice.
高昂的成本和基于项目的（短期）融资意味着沿海工程项目往往在缺乏适当的施工后监测计划的情况下进行。因此，海岸线稳定结构或海滩养护的性能无法得到恰当量化。鉴于海滩的高价值以及侵蚀问题和沿海工程应对措施的增加，管理者需要尽可能多的准确数据来支持高效决策。这项工作提出了一种方法，用于描述因工程行动导致的海岸线位置变化。我们描述了一种基于卫星遥感的新的低成本方法，用于在实施前、实施期间和实施后以高时间和空间分辨率监测海岸线演变。首先，使用自动海岸线提取工具SHOREX从陆地卫星5、7、8和9以及哨兵2星座的公开可用卫星图像中识别并提取卫星衍生的水线。然后汇编水线位置，量化随时间的差异，并构建一个矩阵，以便轻松描绘和解释侵蚀/淤积的时空模式。这使得非专业人员也能够获取和理解形态学数据。在西班牙瓦伦西亚海岸不同空间尺度上的两个应用示例展示了如何在不同细节水平（从局部到区域）和不同时间段内描述海滩对沿海工程行动的响应。这些应用证明了该方法的实用性，因为它允许分析干预前后的海岸变化，并提供了一种手段来克服普遍存在的监测不足问题，从而改进沿海工程实践。
