文献类型：期刊文献

英文题名：Impacts of El Ni?o-Southern Oscillation on Multi-Scale Morphodynamics of an Embayed Beach in Southern China

作者：Hu, Taihuan[1]; Zhu, Shibing[2,3]; Chen, Shenliang[1]; Chen, Zhaoguang[2]; Li, Zhiqiang[2]

机构：[1] State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai, China; [2] College of Electronic and Information Engineering, Guangdong Ocean University, Zhanjiang, China; [3] School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, China

年份：2024

外文期刊名：SSRN

收录：EI(收录号：20240300822)

语种：英文

外文关键词：Atmospheric pressure - Climatology - Erosion - Sea level - Storms

外文摘要：Increased coastal erosion and extreme oceanographic forcing driven by El Ni?o-Southern Oscillation (ENSO) along the Pacific coast are increasingly receiving concerns. Despite considerable attention, the specific impact of these phenomena on Chinese shorelines, particularly along the South China beaches, remains inadequately understood. Traditional long-term assessments of beach behavior often fail to fully capture influence of interannual climate variability, such as ENSO, on beach morphodynamics. In this study, we conduct a high-frequency investigation in the Qing'an Bay beach in South China and employ a profile fitting model to refined waterline extraction from monthly satellite images. The findings indicate that the coastal evolution is intricately linked to a combination of strong wave events, summer storms, winter cold waves, and the amplifying effects of ENSO. During La Ni?a phase, the sea level in the western Pacific experiences a rise, with associated storms proving particularly destructive to the beach environment, leading to violent oscillations in the coastline. Significant wave heights during strong La Ni?a phases markedly surpass neutral conditions, precipitating intensified sediment movement. Therefore, it is imperative to recognize that shoreline changes alone do not fully characterize coastal erosion. Assessment must also encompass alterations in beach volume. By calculating beach volume per unit width that accounts for the influence of ENSO variability on the beach, the seasonal characteristics of the beach showed sediment losses in summer and autumn, and gains in winter and spring, which was more obvious during strong La Ni?a. ? 2024, The Authors. All rights reserved.