Assessing the potential for change in the middle Yangtze River channel following impoundment of the Three Gorges Dam

Yuan, Weili; Yin, Dong Min; Finlayson, Brian; Chen, Zhongyuan

doi:10.1016/j.geomorph.2011.06.039

Cited by 97 publications

(50 citation statements)

References 18 publications

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“…Using the TM images of 2003 provided by America's Landsat [4][5]7], the landmark spectrum characteristics and NDVI time series variation are comprehensively analyzed. The object-oriented classification technique is implemented in order to classify the Poyang wetland and the area of the main land use types in the Poyang (Table 2).…”

Section: Remote Sensing Extraction Of Wetland Vegetation Area In Poyamentioning

confidence: 99%

“…Poyang Lake is one of two biggest lakes still linked with the Yangtze, which is not only the natural storing of the Yangtze River flood and an important wetland of the world, but also a significant region of biodiversity for the Yangtze [3][4]. The TGP operation has changed the temporal distribution of the incoming water from the upper reaches of the Yangtze [5][6] and caused the change of water regime of Poyang [7][8][9], which will further lead to changes in water ecological environment. As a result, the development of water resources, conservation of wetland ecology, and biological diversity in Poyang will be directly affected, and even sustainable use of water and protection of the Yangtze environment may be involved [10].…”

Section: Introductionmentioning

confidence: 99%

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Effects of the Three Gorges Project on the Environment of Poyang Lake

Li¹,

Lai²,

Dong³

et al. 2016

Pol. J. Environ. Stud.

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Impounding by the Three Gorges Project (TGP) changed the hydrological process and affected the ecosystem in the middle and lower reaches of the Yangtze River. Poyang Lake is closely linked with the Yangtze River. This paper presents a coupled numerical model designed for simulating the tempo-spatial variation of water quantity and quality in the lake's water system that features complex river-lake interactions. According to the calculated results of a typical year (2000) under two scenario schemes, we evaluated TGP's effects on the ecological environment of the lake. The results show that due to TGP impoundment, the hydraulic gradient at the lake outlet has increased and that the outflow fluctuates dynamically and regularly with the increase and decrease of the TGP released discharge. The lake water level falls in advance and the average reduction magnitude of the water level decreases progressively from north to south, showing a spatially uneven effect, which is 0.95 m, 0.70 m, 0.74 m, 0.35 m, and 0.80 m at Xingzi, Tangyin, Duchang, Kangshan, and Wucheng stations, respectively. The ammonia nitrogen output from the lake to the Yangtze River increases and the total ammonia nitrogen amount within the lake region decreases. The average ammonia nitrogen concentration within the lake region tends to increase slightly and the influence magnitude on the concentration is reduced from north to south. The wetland vegetation area fluctuates dynamically with the decline of the water level, and the increase of the wetland vegetation area ranges from 0.64 to 215.48 km 2 . As a result of the falling water levels, the bottomlands in the lake region are exposed relatively earlier and the continuous exposure days increase, which intensifies the problem that migrant birds do not have enough food. Meanwhile the number of days when the bottomland and wetland are submerged decrease, which will further accelerate the degradation succession of wetland vegetation.

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Section: Remote Sensing Extraction Of Wetland Vegetation Area In Poyamentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of the Three Gorges Project on the Environment of Poyang Lake

Li¹,

Lai²,

Dong³

et al. 2016

Pol. J. Environ. Stud.

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show abstract

“…As the longest river in China and the third longest river in the world, the Yangtze River originates from Dangla Mountain Range and is more than 6300 km in length and has a catchment area of 1.94 million km 2 . The Yangtze River is commonly divided into three reaches, namely, the upper, middle and lower reaches [29]. LJR is located the middle reach of the river and surrounded by extensive floodplains.…”

Section: Study Areamentioning

confidence: 99%

“…These studies mainly focused on certain aspects, such as the flow and sediment [20][21][22][23], bank erosion and stability [24,25], river channel pattern [19,26] and hydrological effect between rivers and lakes [27,28]. The annual average sediment load at Yichang and Jianli stations in the post-dam period (2003)(2004)(2005)(2006)(2007) was reduced by 74% and 84%, respectively, compared with the pre-dam period [29]. The drastic decrease in sediment load leads to severe and prevalent channel scouring downstream of the dam.…”

Section: Introductionmentioning

confidence: 99%

Remotely Sensed Trajectory Analysis of Channel Migration in Lower Jingjiang Reach during the Period of 1983–2013

et al. 2015

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Abstract:In China, the Lower Jingjiang Reach (LJR) of the Yangtze River could be one of the most complicated areas in terms of channel migration. The river had undergone many channel changes in the reach since the 18th century. Intensive human activities in recent decades, such as the construction of upstream dams and revetments, had directly affected the channel migration characteristics. The revetment would significantly diminish migration, whereas the reduced sediment caused by dams would increase bank erosion and bank failure risks. Satellite imageries of Landsat Multi Spectral Scanner (MSS), Thematic Mapper (TM), Enhanced Thematic Mapper Plus (ETM+) and Operational Land Imager (OLI) were employed to quantify the planform migration of the reach from 1983 to 2013 and to investigate the possible effect of human activities on the LJR channel evolution. Apart from the commonly used planform morphometric parameters, the migration direction was introduced to predict the future migration trends. Results showed that the LJR was gradually changing to a straighter channel, with sinuosity reducing from 2.09 to 1.9 and river length decreasing from 125.32 km to 113.31 km in the past 30 years. Planform morphometric parameters, such as migration rate of the channel centerline and erosion and deposition areas and rates, also decreased drastically in the past 30 years. The migration rate of the channel centerline decreased from 31.05 m¨year´1 in 1983-1988 to 11.62 m¨year´1 in 2009-2013. The lateral erosion and deposition areas decreased from 21.32 and 25.73 km 2 in 1983-1988 to 4.83 and 5.83 km 2 in 2009-2013. All of these findings indicate that the LJR tended to be in a steady state from 1983 to 2013 and was totally controlled by the bank revetments. However, the undercutting was strengthened because of the restrictive effect of revetments on lateral migration in the LJR. Moreover, the channel migrated to the left bank with a visible tendency as the total migration area to the left bank was approximately two times that of the right bank during the period. Consequently, the left bank of the LJR should be the focus of more attention in future migrations, and bank revetments of the left bank should be kept reinforced and adjusted with the change of water and sediment conditions.

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“…Ezzel párhuzamosan az alvízi szakaszra kevesebb hordalék jut, a fellépő tisztavíz erózió következtében megindul a meder kimélyülése, azaz bevágódik a folyó (Kondolf 1997, Petts és Gurnell 2005, Yuan et al 2012. A Colorado folyón létesített vízerőművek jelentős bevágódást indítottak el, hiszen a Hoover gát 0,5 m/év medermélyülést okozott (Goudie 2000), de a Davis vízerőmű alatt is 0,2 métert vágódott be a folyó egy év alatt (Williams és Wolman 1984).…”

Section: Völgyzárógátak éS Duzzasztókunclassified

A Dráva horvát-magyar szakaszán a vízjárás és a mederdinamika vizsgálata

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Assessing the potential for change in the middle Yangtze River channel following impoundment of the Three Gorges Dam

Cited by 97 publications

References 18 publications

Effects of the Three Gorges Project on the Environment of Poyang Lake

Effects of the Three Gorges Project on the Environment of Poyang Lake

Remotely Sensed Trajectory Analysis of Channel Migration in Lower Jingjiang Reach during the Period of 1983–2013

A Dráva horvát-magyar szakaszán a vízjárás és a mederdinamika vizsgálata

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