In this study, a reduction in sediment budget due to the development of a river watershed, resulting in coastal erosion, was reviewed, and the rate of background erosion was calculated through an examination of the loss of coastal sediment into the open sea. The west coast of the Korean peninsula is severely impacted by the intercept of inflowing sediments from rivers, owing to the watershed development. However, the effects have not fully propagated into the entire coastal area, and thus, the long-term coastal erosion remains insignificant. However, a serious and irrevocable disaster may occur once the coastal erosion begins. Therefore, an analysis of the coastal erosion resulting from changes in the sediment budget, due to the development of the watershed, was conducted on Janghang Songrim Beach. A littoral cell of the Geum River was selected for a quantitative analysis of the decrease in the sediment budget from the watershed development. The rate of coastal sediment loss offshore, which reflects the characteristics of the Janghang Songrim Beach, and the future rate of coastal erosion were calculated. Then, the results were verified by employing geometrically corrected satellite photographs from previous years. This will enable us to predict the time of coastal erosion in the future due to a reduction in the sediment budget and watershed development, and prepare for future disasters resulting from the coastal erosion. Based on research into the components constituting the coastal development, the present study presents theoretical formulae allowing the prediction of the sediment budget and providing a practical contribution to the prevention of coastal erosion, for which additional reliable studies need to be conducted.

中文翻译：

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韩国锦江口潮汐屏障的建设导致长航海滩背景侵蚀率的估算

在这项研究中，审查了由于河流流域的发展而导致沿海侵蚀的沉积物预算减少，并通过检查沿海沉积物流向公海的损失来计算背景侵蚀率。由于流域的发展，朝鲜半岛的西海岸受到河流流入的沉积物拦截的严重影响。但是，其影响尚未完全传播到整个沿海地区，因此，长期的沿海侵蚀仍然微不足道。但是，一旦海岸侵蚀开始，可能会发生严重且不可挽回的灾难。因此，在长杭松林海滩进行了因流域发展而由沉积物预算变化引起的海岸侵蚀的分析。选择了锦江的一个沿岸单元，以定量分析流域开发中沉积物预算的减少。计算出反映长航松林海滩特征的近海沿海沉积物流失率，以及未来的海岸侵蚀率。然后，通过使用前几年的几何校正卫星照片来验证结果。这将使我们能够预测由于沉积物预算减少和流域开发减少而导致的未来海岸侵蚀的时间，并为由海岸侵蚀引起的未来灾难做好准备。根据对沿海开发构成要素的研究，