DOI: 10.3390/ijerph17051636
论文题名: Rapid loss of tidal flats in the yangtze river delta since 1974
作者: Li X. ; Zhang X. ; Qiu C. ; Duan Y. ; Liu S. ; Chen D. ; Zhang L. ; Zhu C.
刊名: International Journal of Environmental Research and Public Health
ISSN: 16617827
出版年: 2020
卷: 17, 期: 5 语种: 英语
英文关键词: Landsat
; Reclamation
; Remote sensing
; Sediment supply
; Tidal flat
; Yangtze River delta
Scopus关键词: land reclamation
; Landsat
; remote sensing
; sediment transport
; software
; spatiotemporal analysis
; tidal flat
; article
; deterioration
; estuary
; satellite imagery
; sea level rise
; seashore
; sediment
; time series analysis
; China
; Yangtze Delta
英文摘要: As the home to national nature reserves and a Ramsar wetland, the tidal flats of the Yangtze River Delta are of great significance for ecological security, at both the local and global scales. However, a comprehensive understanding of the spatiotemporal conditions of the tidal flats in the Yangtze River Delta remains lacking. Here, we propose using remote sensing to obtain a detailed spatiotemporal profile of the tidal flats, using all available Landsat images from 1974 to 2018 with the help of the Google Earth Engine cloud platform. In addition, reclamation data were manually extracted from time series Landsat images for the same period. We found that approximately 40.0% (34.9–43.1%) of the tidal flats in the study area have been lost since 1980, the year in which the tidal flat area was maximal. The change in the tidal flat areas was consistent with the change in the riverine sediment supply. We also found that the cumulative reclamation areas totaled 816.6 km2 and 431.9 km2 in the Yangtze estuary zone and along the Jiangsu coast, respectively, between 1974 and 2018. Because of reclamation, some areas (e.g., the Hengsha eastern shoal and Pudong bank), which used to be quite rich, have lost most of their tidal flats. Currently, almost 70% of the remaining tidal flats are located in the shrinking branch (North Branch) and the two National Nature Reserves (Chongming Dongtan and Jiuduansha) in the Yangtze estuary zone. Consequently, the large-scale loss of tidal flats observed was primarily associated with reduced sediment supply and land reclamation at the time scale of the study. Because increasing demand for land and rising sea levels are expected in the future, immediate steps should be taken to prevent the further deterioration of this valuable ecosystem. © 2020 by the authors. Licensee MDPI, Basel, Switzerland. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/159126
Appears in Collections: 气候变化与战略
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作者单位: School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou, 221116, China; State Key Laboratory of Remote Sensing Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, 100101, China
Recommended Citation:
Li X.,Zhang X.,Qiu C.,et al. Rapid loss of tidal flats in the yangtze river delta since 1974[J]. International Journal of Environmental Research and Public Health,2020-01-01,17(5)