Spring floods in Siberia annually affect local communities. Major urban settlements in the region implemented flood control structures, so rural areas take a heavy beating. In 2018, spring floods severely hit multiple communities in central Yakutia, exposing deficient flood prevention and risk management practices. Notably, Amga village, an important local center, was severely inundated. Hydrological analysis shows that the 2018 flood had a 50-yr return period, and was caused by an ice jam in a nearby channel bend where mid-channel sand bars impede ice movement during breakup. The cold spells of late April and early May in the middle section of the river promote ice-jam development, causing extreme water stage rise. Highest water stage is unrelated to either winter snow water equivalent or early May rainfall. Estimated tangible direct damage to the Amga community equals 5.1B ($81.5M) in 2018 prices, but only 0.13B ($2.1M), or 2.5% of this total, was reclaimed. A questionnaire survey revealed that most residents report important deterioration of drinking water quality and health after flooding. Residents respond positively to risk mitigation actions, implemented by the local and regional authorities, except ice dusting and cutting, and report minor activity of official sources in spreading information on flood progress. This is an Open Access article distributed under the terms of the Creative Commons Attribution Licence (CC BY-NC-ND 4.0), which permits copying and redistribution for non-commercial purposes with no derivatives, provided the original work is properly cited (http://creativecommons.org/ licenses/by-nc-nd/4.0/) doi: 10.2166/nh.2020.124 ://iwaponline.com/hr/article-pdf/doi/10.2166/nh.2020.124/697171/nh2020124.pdf N. I. Tananaev (corresponding author) V. A. Efremova Melnikov Permafrost Institute SB RAS, 36 Merzlotnaya Str., Yakutsk 677010, Russia E-mail: tananaevni@mpi.ysn.ru T. N. Gavrilyeva O. T. Parfenova North-Eastern Federal University, Institute of Natural Sciences, 48 Kulakovskogo Str., Yakutsk, Russia

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评估社区对春季极端洪水的脆弱性：以西伯利亚雅库特中部 Amga 河为例

西伯利亚的春季洪水每年都会影响当地社区。该地区的主要城市居民点实施了防洪设施，农村地区遭受重创。2018 年，春季洪水严重袭击了雅库特中部的多个社区，暴露了防洪和风险管理实践不足。值得注意的是，当地重要的中心 Amga 村被严重淹没。水文分析表明，2018 年的洪水有 50 年的重现期，是由附近河道弯曲处的冰堵塞引起的，河道中段沙洲在破裂期间阻碍了冰的运动。河中段4月下旬和5月初的寒流促进了冰塞的发展，导致水位极端上升。最高水位与冬季雪水当量或 5 月初的降雨量无关。以 2018 年的价格计算，估计对 Amga 社区的有形直接损害相当于 5.1B（8150 万美元），但只有 0.13B（210 万美元），即总数的 2.5% 被收回。一项问卷调查显示，大多数居民报告洪水后饮用水质量和健康状况严重恶化。居民对地方和地区当局实施的风险缓解行动做出积极响应，但除冰除尘和切割外，还报告了官方来源在传播洪水进展信息方面的小规模活动。这是一篇根据知识共享署名许可 (CC BY-NC-ND 4.0) 条款分发的开放获取文章，该许可允许出于非商业目的复制和重新分发，没有衍生品，前提是正确引用原始作品 (http: //creativecommons.org/licenses/by-nc-nd/4.0/) doi: 10.2166/nh.2020.124 :