Rapid Population Growth in Chinese Floodplains from 1990 to 2015.

Rapid Population Growth in Chinese Floodplains from 1990 to 2015.
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1990年至2015年中国洪泛区人口快速增长

DOI:
10.3390/ijerph15081602
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发表时间:
2018-07-28
影响因子:
--
通讯作者:
Gao J
Gao J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Fang Y;Du S;Scussolini P;Wen J;He C;Huang Q;Gao J

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我国洪水灾害频繁,但洪泛区人口的时空分布格局仍不清楚。这严重限制了我们对洪水风险的理解和减灾工作的有效性。在这里,我们提出了中国人口的第一个量化及其动态,基于1990年,2000年,2010年和2015年的新可用人口数据集和洪水图。我们发现,2015年的人口为4.533亿,占总人口的33.0%,人口密度是洪泛区以外的3.6倍。从1990年到2015年,PopF每年增长1.3%,远远快于其他地方(0.5%)。越来越多的人口(从1990年的53.2%到2015年的55.6%)居住在水深超过2米的洪水区。此外,预计未来几十年人口将迅速增加。我们还发现了泛洪记忆对控制PopF增长及其随时间衰减的影响。这些发现意味着中国的洪水风险正在加剧,这与气候变化和快速的社会经济发展有关。
Although China suffers from frequent and disastrous floods, the spatiotemporal pattern of its population living in the floodplain (PopF) is still unknown. This strongly limits our understanding of flood risk and the effectiveness of mitigation efforts. Here we present the first quantification of Chinese PopF and its dynamics, based on newly-available population datasets for years 1990, 2000, 2010, and 2015 and on a flood map. We found that the PopF in 2015 was 453.3 million and accounted for 33.0% of the total population, with a population density 3.6 times higher than outside floodplains. From 1990 to 2015, the PopF increased by 1.3% annually, overwhelmingly faster than elsewhere (0.5%). A rising proportion (from 53.2% in 1990 to 55.6% in 2015) of the PopF resided in flood zones deeper than 2 m. Moreover, the PopF is expected to increase rapidly in the coming decades. We also found the effect of flood memory on controlling PopF growth and its decay over time. These findings imply an exacerbating flood risk in China, which is concerning in the light of climate change and rapid socioeconomic development.
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