Several researchers are studying the effect that the COVID-19 pandemic event impact has on coastal communities, especially where Sun, Sea, Sand (3S) tourism is a relevant voice in their Gross Domestic Product (GDP). Among possible coastal environment influences, that on beach morphology has not yet been considered, but analysis of what occurred in similar cases in the past can help in finding how wide are pandemics impact and how many research fields are involved.

The three main plagues that struck Europe in historical times (years 451, 1348 and 1630) enormously reduced population numbers and triggered abandonment of cultivated areas and famine induced by bitter climatic conditions played a significant role. Forests grew and soil erosion was greatly reduced causing a decreased coastal sediment input. The study of the beach ridges/dunes geometry in two river deltas in Tuscany (Italy) reveals the erosional phases induced by yr 451 and yr 1348 plagues. Any traces the yr 1630 plague could have left, have been erased by anthropogenic activity and by delta erosion that started at the end of the 19th cent. and which is still current.

This paper shows the importance of a multidisciplinary approach to the study of coastal evolution, and suggests further research fields where COVID-19 pandemic could be considered, even in cases in which environment response is not immediate, such as in past infections.

几位研究人员正在研究COVID-19大流行事件对沿海社区的影响，尤其是在太阳，海洋，沙滩（3S）旅游业是其国内生产总值（GDP）的重要代表的地方。在可能的沿海环境影响中，尚未考虑到对海滩形态的影响，但是对过去在类似情况下发生的情况进行分析可以帮助找出大流行病的影响范围和涉及的研究领域。

历史上袭击欧洲的三大灾祸（451年，1348年和1630年）极大地减少了人口，并引发了耕地面积的增加和恶劣气候条件引起的饥荒。森林生长，水土流失大大减少，导致沿海沉积物输入量减少。对意大利托斯卡纳的两个河三角洲的海滩山脊/沙丘几何形状的研究揭示了451年和1348年鼠疫引起的侵蚀阶段。1630年瘟疫可能留下的任何痕迹，已被人为活动和19世纪末开始的三角洲侵蚀所抹去。并且仍然是最新的。

本文显示了多学科方法在沿海演变研究中的重要性，并提出了可以考虑COVID-19大流行的进一步研究领域，即使在环境响应不是立即的情况下，例如在过去的感染中也是如此。