剖析2020年中国南方夏季洪水及其对农田的影响。
Characterizing the 2020 summer floods in South China and effects on croplands.
作者信息
Chen Xi, Dong Jinwei, Huang Lin, Chen Lajiao, Li Zhichao, You Nanshan, Singha Mrinal, Tao Fulu
机构信息
Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China.
出版信息
iScience. 2023 Jun 12;26(7):107096. doi: 10.1016/j.isci.2023.107096. eCollection 2023 Jul 21.
Floods occur more frequently in the context of climate change; however, flood monitoring capacity has not been well established. Here, we used a synergic mapping framework to characterize summer floods in the middle and lower reaches of the Yangtze River Plain and the effects on croplands in 2020, from both flood extent and intensity perspectives. We found that the total flood extent was 4936 km from July to August, and for flood intensity, 1658, 1382, and 1896 km of areas experienced triple, double, and single floods. A total of 2282 km croplands (46% of the flooded area) were inundated mainly from Poyang and Dongting Lake Basins, containing a high ratio of moderate damage croplands (47%). The newly increased flooding extent in 2020 was 29% larger than the maximum ever-flooded extent in 2015-2019. This study is expected to provide a reference for rapid regional flood disaster assessment and serving mitigation.
在气候变化背景下，洪水发生得更为频繁；然而，洪水监测能力尚未得到很好的建立。在此，我们使用了一个协同映射框架，从洪水范围和强度两个角度，对长江中下游平原2020年夏季洪水及其对农田的影响进行了特征描述。我们发现，7月至8月的洪水总面积为4936公里，就洪水强度而言，有1658公里、1382公里和1896公里的区域分别经历了三次、两次和一次洪水。共有2282公里的农田（占受淹面积的46%）被淹没，主要来自鄱阳湖和洞庭湖流域，其中中度受损农田的比例较高（47%）。2020年新增加的洪水范围比2015 - 2019年有记录以来的最大洪水范围大29%。本研究有望为区域洪水灾害快速评估及减灾工作提供参考。
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