Increasing exposure to floods in China revealed by nighttime light data and flood susceptibility mapping

Dados Bibliográficos

ID15547469
AutoresJian Fang (0000-0003-2022-6843, Central China Normal University, autor correspondente), Chaoyang Zhang (0009-0006-3771-8747, Wuhan University), Jiayi Fang (0009-0002-2318-1265, Central China Normal University, autor correspondente), Muxing Liu (0000-0003-0363-0692, Central China Normal University), Yibo Luan (0000-0001-7687-460X, Wuhan Science and Technology Bureau)
Ano2021
Volume16
Fascículo10
Páginas104044-104044
Data de publicação2021-09-13
Peer ReviewedSim
Open AccessSim
TipoARTICLE
PeriódicoEnvironmental Research Letters (JOURNAL)
Identificadores do periódicoISSN: 1748-9326 • E-ISSN: 1748-9326
EditoraIOP Publishing (PUBLISHER • GB)
DOI10.1088/1748-9326/ac263e
OpenAlexW3200798213
IdiomaEN
Citações recebidas9
Referências citadas37

The impacts of floods on human society are expected to increase at both global and regional scale in the context of global climate change and increasing human activity in flood-prone areas. However, spatially explicit and dynamic assessments of flood exposure in China are still very limited, which hinders the development of risk-based flood management considering dynamic changes. Therefore, this study explored the spatial-temporal variations of flood exposure in China from 1992 to 2020 through flood susceptibility mapping and using satellite-based nighttime light data. It can be revealed that a significantly high level and rapid increase of flood exposure could be observed in China, especially around some major metropolitan areas in the eastern region. The expansion of flood exposure was mainly distributed in North China and some coastal areas during 1992–2000; while mainly occurring in South China during 2000–2013, especially in middle Yangtze River basin where flood susceptibility is highest. The changes of flood exposure in China were mainly driven by the increase in the number of lit pixels during the early period, and were dominated by the increase in the intensity of lit pixels in the later period. This process continued to the latest period of 2014–2020. This implies that upgrading of existing flood management facilities and efforts for more effective measures are urgently needed in flood-prone urban areas with increasing exposure intensity. In addition, this study demonstrated the advantage of nighttime light data for disaster assessment and monitoring. With the development of more nighttime light products of higher resolution and higher detection ability and the integration with ground-based observation, it is promising to achieve more precise monitoring and analysis of flood exposure at a large scale, and support fine-grained management of flood risk

China · Climate change · Climatology · Context (archaeology · Flood myth · Geography · Hydrology (agriculture · Physical geography · Environmental Science · Flood Risk Assessment and Management · Impact of Light on Environment and Health · Land Use and Ecosystem Services · Ecology · Geology