Extreme meteorological events have had devastating consequences all over the world throughout the ages. In this study, we look into the floods at the mouth of the Douro River (Porto, Portugal) in the eighteenth century to expand the data series of floods in Northern Portugal. Information was gathered mostly from documentary narrative sources, either individual or institutional (administrative and ecclesiastic), some of which include reports of Pro Serenitate ceremonies. A study by the priest Rebelo Costa (1789) and the memories of the merchant Ignacio Henckell from 1717 to 1800 stand out among the individual sources. We concluded that there was great interannual variability in the occurrence of the 54 recorded floods, the highest number of which occurred in the 1780s. The “catastrophic” floods were recorded in 1727, 1739, 1769, 1774, 1777, 1788 and 1798, four of which are studied in detail in this paper. The greatest number of flood events took place in winter and autumn, and most of them lasted between 1 and 3 days. An analysis of the description of the floods, their impacts and the associated meteorological causes was carried out. In most cases, the frontal activity associated with Atlantic cyclonic systems was the cause of positive precipitation anomalies in NW Iberia. The great variability in heavy precipitation was confirmed by the new data. However, hardly any temporal simultaneity was found with other case studies in Southern Europe, except for Spain, especially several localities of Galicia and the mid Douro Valley (Zamora).

各个年龄段，极端的气象事件在世界范围内都具有毁灭性的后果。在这项研究中，我们研究了18世纪杜罗河（葡萄牙波尔图）河口的洪水，以扩展葡萄牙北部洪水的数据系列。信息主要来自个人或机构（行政和教会）的文献叙述来源，其中一些包括Pro Serenitate的报告。仪式。牧师Rebelo Costa（1789）的研究和商人伊格纳西奥·亨克尔（Ignacio Henckell）从1717年到1800年的记忆在各个文献中脱颖而出。我们得出的结论是，有记录的54次洪水的发生具有很大的年际变化，其中最大的一次发生在1780年代。在1727年，1739年，1769年，1774年，1777年，1788年和1798年记录了“灾难性”洪水，本文对此进行了详细研究。洪水事件的发生次数最多的是冬季和秋季，大部分持续了1至3天。对洪水的描述，洪水影响和相关的气象原因进行了分析。在大多数情况下，与大西洋气旋系统有关的额叶活动是西北伊比利亚地区正降水异常的原因。新数据证实了强降水的巨大变化。但是，除了西班牙，尤其是加利西亚和杜罗河谷中部（Zamora）的几个地方，在南欧的其他案例研究中几乎没有发现任何时间上的同时性。