Journal of Geographical Sciences, Volume. 30, Issue 1, 145(2020)
Alternate erosion and deposition in the Yangtze Estuary and the future change
Fig. 1. Important locations and geographical features of the Yangtze Estuary. (a) Locations of the Datong station, the Three Gorges Dam (TGD), the Gezhou Dam (GZD) and the Danjiangkou Dam (DJKD) within the Yangtze River Basin of China, and the Yangtze Estuary (the study area); (b) plan view of the Yangtze Estuary; CES, HES and NES represent Chongming East Shoal, Hengsha East Shoal and Nanhui East Shoal, respectively; the region enclosed by the red line almost covers the entire Yangtze Estuary downstream of Xuliujing, which is identical to that in Chen Y et al. (2018) providing the major dataset of total erosional/depositional rate in this study; (c) major sediment sources of the Yangtze Estuary.
Fig. 2. Comparison between morphological and hydrological processes in the Yangtze Estuary. (a) Histogram of erosional/depositional rates (positive values indicating deposition, and negative ones representing erosion) of the marked submerged area (
Fig. 3. Residual water level changing with distance upstream from the Yangtze River mouth with varying monthly river water discharge in 2005.
Fig. 4. Yearly dredging amount of the Deepwater Channel Project from 2000 to 2015 (a) and multi-year average reclamation rates over the whole Yangtze Estuary during the periods of 1960-1980, 1980-2000, 2000-2010 and 2010-2015 (b) and erosional/depositional rates (positive values indicating deposition, and negative ones representing erosion) of the entire Yangtze Estuary during the comparative periods ((a) and (b)).
Fig. 5. Spatial distribution of bed-elevation changing rates (positive values indicating deposition, and negative ones representing erosion) in the Yangtze mouth bar area (121.78°E-122.34°E, 30.96°N-31.46°N) during the periods of (a) 1997-2002 and (b) 2002-2007
Fig. 6. Comparison of net sediment supplies at Xuliujing and the Yangtze River mouth with depositional rates within (a) Area 1, (b) Area 2 and (c) Area 3 during 2002-2009. Specifically, Area 1 represents the mouth bar area (121.78°E-122.34°E, 30.96°N-31.46°N) in
Fig. 7. Histogram of multi-year average duration days at different levels of river water discharge at Datong during different stages of the construction of major dams on the Yangtze River. The dividing years of 1968, 1981 and 2003 represent the start years of water impoundment of Danjiangkou Dam, Gezhou Dam and Three Gorges Dam (
Fig. 8. Variations in sediment sources of (a) the Yangtze River Basin, (b) the Yellow River Delta and (c) the Hangzhou Bay, and the consequent morphological change rate of the entire Yangtze Estuary in the future.
Data sources of this study
Data sources of this study
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Linear regressions of erosional/depositional rate of the entire Yangtze Estuary interpreted by river fluxes
Linear regressions of erosional/depositional rate of the entire Yangtze Estuary interpreted by river fluxes
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Major typhoons happened in the Yangtze estuarine area over the past 65 years
Major typhoons happened in the Yangtze estuarine area over the past 65 years
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Boyuan ZHU, Yitian LI, Yao YUE, Yunping YANG, Enhang LIANG, Chuncai ZHANG, Alistair G. L. BORTHWICK. Alternate erosion and deposition in the Yangtze Estuary and the future change[J]. Journal of Geographical Sciences, 2020, 30(1): 145
Received: Feb. 18, 2019
Accepted: Jun. 4, 2019
Published Online: Sep. 29, 2020
The Author Email: YUE Yao (yueyao@whu.edu.cn)