Surface water changes in China's Yangtze River Delta over the past forty years. (April 2023)

• Record Type: Journal Article
• Authors: Chen, Liumeng; Liu, Yongchao; Li, Jialin; Tian, Peng; Zhang, Haitao
• Is Part Of: Sustainable cities and society. Volume 91(2023)
• Publication Date: 2023-04
• Subjects: Surface water -- Dynamic change -- Human activities -- Landsat images -- Yangtze River Delta regions; Sustainable urban development -- Periodicals; Sustainable buildings -- Periodicals; Urban ecology (Sociology) -- Periodicals; 307.76
• DOI: 10.1016/j.scs.2023.104458
• Languages: English
• ISSNs: 2210-6707

Abstract

Highlights: Annual spatial patterns of surface water in the Yangtze River Delta were extracted based on Landsat imagery. The temporal trend in the study area surface water was tracked during 1984–2021. The driving mechanism analysis of surface water change in the Yangtze River Delta was analyzed. The water body area in the study area tends to be stable and water ecosystem service capacity decreases. Abstract: Surface water security is a challenge in highly urbanized, economically active, and high water consumption regions. Exploring the supply and demand of surface water resources in developed is conducive to promoting the sustainable socioeconomic development of these agglomerations. The Yangtze River Delta (YRD) region is one of the most important world-class urban in China. However, it is unclear how surface water has responded to underlying impacts of climate change and anthropogenic water exploitation over the past decades. Here, we monitored the spatiotemporal characteristics of surface water and investigated the driving forces and regional impact of surface water changes. We found that (1) the trend in surface water body area in China's YRD was stable over the past 40 years; (2) precipitation and the digital elevation model best determined the spatial distribution of surface water in the YRD; (3) the construction of reservoirs was the main factor for the increase of surface water area; and (4) the increase in population density was the main driver of the decrease in surface water area. Human activities deplete and artificially increase surface water supply, which tends to offset; human activities have decreased water conservation services and soil and water conservation services of the YRD.