Abstract. In France, flooding is the most common and damaging natural hazard. Due to global warming, it is expected to globally exacerbate, and it could be even more pronounced in the European Alps that warm at a rate twice as high in the Northern Hemisphere. The Alps are densely populated, increasing exposure and vulnerability to flood hazard. To approach long-term evolutions of past flood occurrence and related socio-economic impacts in relation to changes in the flood risk components (i.e. hazard, exposure and vulnerability), the study of historical records is highly relevant. To this aim we analyze the newly constituted database of Historical Impacts of Floods in the Arve Valley (HIFAVa) located in French Northern Alps and starting in 1850. This database reports for the first-time flood occurrences and impacts in a well-documented Alpine catchment that encompasses both a hydrological and societal diversity. We analyze past impacts in regard to their characteristics and evolution in both time and space. Our results show an increasing occurrence of impacts from 1920 onwards, which is more likely related to indirect source effect and/or increasing exposure of goods and people rather than hydrological changes. The analysis reveals that small mountain streams and particularly glacial streams caused more impacts (67 %) than the main river. While increase in heavy rainfall and ice melt are expected to enhance flood hazard in small Alpine catchments, this finding calls to pay a particular attention to flood risk assessment and management in small catchments.

中文翻译：

---

高山集水区洪水影响的地史分析（HIFAVa 数据库，法国阿尔维河，1850-2015 年）

摘要。在法国，洪水是最常见和最具破坏性的自然灾害。由于全球变暖，预计全球变暖会加剧，欧洲阿尔卑斯山的情况可能更加明显，北半球的变暖速度是北半球的两倍。阿尔卑斯山人口稠密，增加了遭受洪水灾害的风险和脆弱性。为了研究过去洪水发生的长期演变以及与洪水风险组成部分（即灾害、暴露和脆弱性）变化相关的相关社会经济影响，对历史记录的研究是高度相关的。为此，我们分析了新建立的 Arve Valley 洪水历史影响数据库(HIFAVa) 位于法国北阿尔卑斯山，始于 1850 年。该数据库报告了首次发生的洪水和对一个有据可查的高山集水区的影响，该集水区包括水文和社会多样性。我们分析过去影响的特征和时间和空间的演变。我们的结果显示，从 1920 年起，影响的发生率越来越高，这更有可能与间接源效应和/或货物和人员接触的增加有关，而不是与水文变化有关。分析表明，与主要河流相比，山间小溪流，尤其是冰川溪流造成的影响更大（67%）。虽然强降雨和冰融化的增加预计会增加高山小集水区的洪水灾害，