Long-Term Morphological Evolution of a Tidal Island as Affected by Natural Factors and Human Activities, the Yangtze Estuary

2010 ◽  
Vol 261 ◽  
pp. 123-131 ◽  
Author(s):  
Ang Gao ◽  
S. L. Yang ◽  
Gang Li ◽  
Peng Li ◽  
S. L. Chen
Keyword(s):  
Human Activities ◽  
Morphological Evolution ◽  
Yangtze Estuary ◽  
The Yangtze Estuary ◽  
Natural Factors

scholarly journals Ecological Degradation of the Yangtze and Nile Delta-Estuaries in Response to Dam Construction with Special Reference to Monsoonal and Arid Climate Settings

Water ◽  
2021 ◽  
Vol 13 (9) ◽  
pp. 1145
Author(s):  
Zhongyuan Chen ◽  
Hao Xu ◽  
Yanna Wang
Keyword(s):  
Regime Shift ◽  
Yangtze Estuary ◽  
Anthropogenic Sources ◽  
Arid Climate ◽  
Dam Construction ◽  
Nutrient Inputs ◽  
The Yangtze Estuary ◽  
Ecological Degradation ◽  
Phytoplankton Communities

This study reviews the monsoonal Yangtze and the arid Nile deltas with the objective of understanding how the process–response between river-basin modifications and delta-estuary ecological degradation are interrelated under contrasting hydroclimate dynamics. Our analysis shows that the Yangtze River had a long-term stepwise reduction in sediment and silicate fluxes to estuary due to dam construction since the 1960s, especially after the Three Gorges Dam (TGD) closed in 2003. By contrast, the Nile had a drastic reduction of sediment, freshwater, and silicate fluxes immediately after the construction of the Aswan High Dam (AHD) in 1964. Seasonal rainfall in the mid-lower Yangtze basin (below TGD) complemented riverine materials to its estuary, but little was available to the Nile coast below the AHD in the hyper-arid climate setting. Nitrogen (N) and phosphate (P) fluxes in both river basins have increased because of the overuse of N- and P-fertilizer, land-use changes, urbanization, and industrialization. Nutrient ratios (N:P:Si) in both delta-estuaries was greatly altered, i.e., Yangtze case: 75:1:946 (1960s–1970s), 86:1:272 (1980s–1990s) and 102:1:75 (2000s–2010s); and Nile case: 6:1:32 (1960s–1970s), 8:1:9 (1980s–1990s), and 45:1:22 (2013), in the context of the optimum of Redfield ratio (N:P:Si = 16:1:16). This led to an ecological regime shift evidenced by a long-term change in phytoplankton communities in the Yangtze estuary, where silicious algae tended to lose dominance since the end of the 1990s, when more toxic dinoflagellates began to emerge. In the Nile estuary, such a regime shift was indicated by the post-dam dramatic reduction in zooplankton standing crop and fish landings until the early 2000s when biological recovery occurred due to nutrient inputs from anthropogenic sources. Although the Yangtze had higher human impacts than the Nile in terms of population, industrialization, and fertilizer application, N concentrations in the Nile estuarine waters surpassed the Yangtze in recent decades. However, eutrophication in the Yangtze estuary is much more intensive than in the Nile, leading to the likelihood of its estuarine water becoming more acidic than ever before. Therefore, ecological degradation in both delta-estuaries does not follow a linear trajectory, due not only to different climate dynamics but also to human forcings. The comparative insights of this study should be incorporated into future integrated coastal management of these two important systems.

Decadal morphological evolution of the Yangtze Estuary in response to river input changes and estuarine engineering projects

Geomorphology ◽  
2016 ◽  
Vol 265 ◽  
pp. 12-23 ◽  
Author(s):  
Hua Long Luan ◽  
Ping Xing Ding ◽  
Zheng Bing Wang ◽  
Jian Zhong Ge ◽  
Shi Lun Yang
Keyword(s):  
Morphological Evolution ◽  
Yangtze Estuary ◽  
The Yangtze Estuary ◽  
River Input ◽  
Engineering Projects

scholarly journals Decadal morphological evolution of the mouth zone of the Yangtze Estuary in response to human interventions

2019 ◽  
Vol 44 (12) ◽  
pp. 2319-2332 ◽  
Author(s):  
Chunyan Zhu ◽  
Leicheng Guo ◽  
Dirk Sebastiaan Maren ◽  
Bo Tian ◽  
Xianye Wang ◽  
...  
Keyword(s):  
Morphological Evolution ◽  
Yangtze Estuary ◽  
The Yangtze Estuary ◽  
Human Interventions ◽  
Mouth Zone

Long-term morphodynamic evolution and the equilibrium mechanism of a flood channel in the Yangtze Estuary (China)

Geomorphology ◽  
2008 ◽  
Vol 99 (1-4) ◽  
pp. 130-138 ◽  
Author(s):  
Yong-Hong Wang ◽  
Peter V. Ridd ◽  
Hua-Lin Wu ◽  
Jia-Xue Wu ◽  
Huan-Ting Shen
Keyword(s):  
Yangtze Estuary ◽  
The Yangtze Estuary ◽  
Morphodynamic Evolution

ZOOPLANKTON DISTRIBUTION AND VARIATION IN THE YANGTZE ESTUARY AND ITS ADJACENT WATERS IN SUMMER AND AUTUMN

2010 ◽  
Vol 33 (6) ◽  
pp. 1219-1225 ◽  
Author(s):  
Fei-Yan ZHANG ◽  
Jing-Liang TANG ◽  
Dao-Ji LI ◽  
Tao FANG ◽  
Biao WANG
Keyword(s):  
Yangtze Estuary ◽  
The Yangtze Estuary ◽  
Zooplankton Distribution
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