scholarly journals Impacts of the Three Gorges Dam on the bathymetric evolution of the Yangtze River Estuary

2015 ◽  
Vol 60 (18) ◽  
pp. 1735-1744 ◽  
Author(s):  
Bing LI ◽  
ZhongFa HE ◽  
XueXin YAN ◽  
JinHua ZHANG ◽  
Yong CHEN
Keyword(s):  
Yangtze River ◽  
River Estuary ◽  
Three Gorges Dam ◽  
Yangtze River Estuary ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges ◽  
The Yangtze River Estuary ◽  
The Three Gorges Dam

scholarly journals Impact of the Three Gorges Dam, the South–North Water Transfer Project and water abstractions on the duration and intensity of salt intrusions in the Yangtze River estuary

2015 ◽  
Vol 19 (11) ◽  
pp. 4411-4425 ◽  
Author(s):  
M. Webber ◽  
M. T. Li ◽  
J. Chen ◽  
B. Finlayson ◽  
D. Chen ◽  
...  
Keyword(s):  
Yangtze River ◽  
River Estuary ◽  
Water Transfer ◽  
Yangtze River Estuary ◽  
Three Gorges ◽  
The Three Gorges ◽  
Long Duration ◽  
The Yangtze River Estuary ◽  
North Water ◽  
The Three Gorges Dam

Abstract. This paper assesses the impacts of the Three Gorges Dam, the South–North Water Transfer Project and other water abstractions on the probability of long-duration salt intrusions into the Yangtze River estuary. Studies of intrusions of saltwater into estuaries are typically constrained by both the short duration of discharge records and the paucity of observations of discharge and salinity. Thus, studies of intrusions of saltwater into estuaries typically seek to identify the conditions under which these intrusions occur, using detailed observations for periods of 20–60 days. The paper therefore first demonstrates a method by which to identify the conditions under which intense intrusions of long-duration occur and then applies that method to analyse the effect of the three projects. The paper constructs a model of the relationship between salinity and discharge and then employs Monte Carlo simulation methods to reconstruct the probability of observing intrusions of differing intensities and durations in relation to discharge. The model predicts that the duration of intrusions with chlorinity ≥ 250 mg L−1 (or ≥ 400 or 500 mg L−1) increases as the number of consecutive days with discharge ≤ 12 000 m3 s−1 (or ≤ 8000 m3 s−1 increases. The model predicts that in 1950–2014, the number of consecutive days with chlorinity ≥ 250 mg L−1 averaged 21.34 yr−1; if the three projects operate according to their normal rules, that average would rise to 41.20 yr−1. For a randomly selected year of discharge history from the period 1950–2014, under normal operating rules for these projects the probability of an intrusion rises from 0.25 (for 30-day intrusions) or 0.05 (for 60-day intrusions) to 0.57 or 0.28, respectively.

scholarly journals Response of vegetation to submergence along Jingjiang Reach of the Yangtze River

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251015
Author(s):  
Guoliang Zhu ◽  
Yitian Li ◽  
Zhaohua Sun ◽  
Shinjiro Kanae
Keyword(s):  
Yangtze River ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
High Elevation ◽  
Three Gorges Dam ◽  
Vegetation Coverage ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges ◽  
The Three Gorges Dam

This work explores the changes in vegetation coverage and submergence time of floodplains along the middle and lower reaches of the Yangtze River (i.e., the Jingjiang River) and the relations between them. As the Three Gorges Dam has been operating for more than 10 years, the original vegetative environment has been greatly altered in this region. The two main aspects of these changes were discovered by analyzing year-end image data from remote sensing satellites using a dimidiate pixel model, based on the normalized difference vegetation index, and by calculating water level and topographic data over a distance of 360 km from 2003–2015. Given that the channels had adjusted laterally, thus exhibiting deeper and broader geometries due to the Three Gorges Dam, 11 floodplains were classified into three groups with distinctive features. The evidence shows that, the floodplains with high elevation have formed steady vegetation areas and could hardly be affected by runoff and usually occupied by humans. The low elevation group has not met the minimal threshold of submerging time for vegetation growth, and no plants were observed so far. Based on the facts summed up from the floodplains with variable elevation, days needed to spot vegetation ranges from 70 to 120 days which happened typically near 2006 and between 2008 and 2010, respectively, and a negative correlation was detected between submergence time and vegetation coverage within a certain range. Thus, floods optimized by the Three Gorges Dam have directly influenced plant growth in the floodplains and may also affect our ability to manage certain types of large floods. Our conclusions may provide a basis for establishing flood criteria to manage the floodplain vegetation and evaluating possible increases in resistance caused by high-flow flooding when these floodplains are submerged.

scholarly journals The impact of the Three Gorges Dam on summer streamflow in the Yangtze River Basin

2019 ◽  
Vol 34 (3) ◽  
pp. 705-717
Author(s):  
Zhenkuan Su ◽  
Michelle Ho ◽  
Zhenchun Hao ◽  
Upmanu Lall ◽  
Xun Sun ◽  
...  
Keyword(s):  
River Basin ◽  
Yangtze River ◽  
Yangtze River Basin ◽  
Three Gorges Dam ◽  
Three Gorges ◽  
The Yangtze River ◽  
The Three Gorges ◽  
The Yangtze River Basin ◽  
The Impact ◽  
The Three Gorges Dam
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