Abstract

Coastal erosion is a natural phenomenon that is becoming a growing problem along coastlines around the world. In this research, the evolution of two beaches located in Benidorm (Spain) has been studied: Poniente Beach and Levante Beach. Both have similar characteristics, but present a different morphological behaviour. An analysis of shoreline evolution has been carried out using aerial images. Then, waves and incident storms were studied and, finally, a sedimentological analysis was performed. From the results obtained, the eastern zone of Poniente Beach presents higher rates of erosion than the western zone. This erosion trend disappeared in the last analysed period due to a change in the incoming wave regime. A decrease in the frequency of waves coming from the east caused the erosion and tilting suffered by this beach. In Levante Beach, the intensity of the waves was reduced, making erosion rates lower. Furthermore, important differences were found from the sedimentological study, such as the lack of homogeneity in sediment grain sizes and a worse wear behaviour on Poniente Beach compared to Levante Beach, which means that these two beaches behave differently facing erosion. This accurate knowledge of the factors mentioned will provide adequate tools for its future management.

摘要

海岸侵蚀是一种自然现象，正在成为世界各地海岸线日益严重的问题。在这项研究中，研究了位于贝尼多姆（西班牙）的两个海滩的演变：Poniente 海滩和 Levante 海滩。两者具有相似的特征，但呈现不同的形态行为。使用航拍图像对海岸线演变进行了分析。然后，研究了波浪和入射风暴，最后进行了沉积学分析。从获得的结果来看，Poniente 海滩东部地区的侵蚀率高于西部地区。由于入射波状态的变化，这种侵蚀趋势在最后一个分析期间消失了。来自东方的海浪频率降低导致该海滩遭受侵蚀和倾斜。在莱万特海滩，波浪的强度降低了，侵蚀率降低了。此外，沉积学研究发现了重要的差异，例如与莱万特海滩相比，Poniente 海滩的沉积物粒度缺乏均匀性以及磨损行为更差，这意味着这两个海滩在面临侵蚀时表现不同。对上述因素的准确了解将为未来的管理提供足够的工具。