Sedimentation and its response to management strategies of the Three Gorges Reservoir, Yangtze River, China

Shi, Rui; Zhang, Bangwen; Wang, Weijie; Yuan, Yuan; Guo, Chao

doi:10.1016/j.catena.2020.105096

Cited by 67 publications

(29 citation statements)

References 49 publications

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“…The sediment budget is an important factor affecting the life cycle of a reservoir. In recent years, the sediment burden in the TGR has been efficiently alleviated due to its operating mode of storing clear water and discharging muddy water (Text S1) 71 . The construction of upstream cascade reservoirs is another important factor controlling the TGR sediment budget 72 .…”

Section: Methodsmentioning

confidence: 99%

Substantial burial of terrestrial microplastics in the Three Gorges Reservoir, China

Gao

Chen

et al. 2023

Commun Earth Environ

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Hydropower dams impact the transport of microplastics from rivers to the ocean. The Yangtze River is a large source of plastics to the ocean. Here, we report microplastic concentrations and compositions across a range of size fractions for sediment samples collected in the upper and lower reaches of the Three Gorges Dam in 2008, 2015, 2019 and 2020. We find a gradual increase in microplastic abundance over time, with preferential retention of small-sized (<300 μm) microplastics in the dam reservoir sediments. Small microplastics accounted for between approximately 44 and 90% of identified microplastics, and 82% of all polyethylene particles, which were the dominant polymer type. Our estimate of the total plastic mass load in reservoir sediments suggests that the Three Gorges Dam retains as much as 8048 ± 7494 tons yr‒1 microplastics in sediments, which is equivalent to 47 ± 44% of the Yangtze River microplastic flux to the ocean.

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Section: Methodsmentioning

confidence: 99%

Substantial burial of terrestrial microplastics in the Three Gorges Reservoir, China

Gao

Chen

et al. 2023

Commun Earth Environ

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“…The results showed significant morphological changes in the MCBs after the TGD operation [5,33], and revealed the process [28] and mechanism for the development of MCBs [33] downstream of the TGD. In contrast, under the influence of the annually cyclic hydrological regime and of longer inundation and exposure periods induced by the TGR operation, the morphological development process of MCBs in the TGR and their response to hydrological and sediment regime changes differs greatly from those downstream of the TGD [34]. However, due to the lack of relevant studies, it is still not clear how the morphology of the MCBs changes under the influence of water level and hydrological regime changes induced by the impoundments and operation of the TGR.…”

Section: Introductionmentioning

confidence: 96%

Dynamics of Mid-Channel Bar during Different Impoundment Periods of the Three Gorges Reservoir Area in China

Tang

Tan

et al. 2021

Water

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The dynamics of the mid-channel bars (MCBs) in the Three Gorges Reservoir (TGR) were substantially impacted by the large water-level changes due to the impoundments of the TGR. However, it is still not clear how the morphology of the MCBs changed under the influence of water level and hydrological regime changes induced by the impoundments and operation of the TGR. In this work, the MCBs in the TGR were retrieved using Landsat remote sensing images from 1989 to 2019, and the spatio-temporal variations in the number, area, morphology and location of the MCBs during different impoundment periods were investigated. The results showed that the number and area of MCBs changed dramatically with water-level changes, and the changes were dominated by MCBs with an area less than 0.03 km2 and larger than 1 km2. The area of MCBs decreased progressively with the rising water level, and the number generally showed a decreasing trend, with the minimum number occurring at the third stage when the water level reached 139 m, resulting in the maximum average area at this period. The ratio of length to width of the MCBs generally decreased with the changes in hydrological and sediment regimes, leading to a shape adjustment from narrow–long to relatively short–round with the rising of the water level. The water impoundments of the TGR led to the migration of the dominant area from the upper section to the middle section of the TGR and resulted in a more even distribution of MCBs in the TGR. The results improve our understanding of the mechanisms of the development of MCBs in the TGR under the influence of water impoundment coupled with the annually cyclic hydrological regime and longer periods of inundation and exposure.

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“…Hence, other sediment management is required to optimally reduce the volume of sediment deposits. The dredging method is an alternative for implementing sediment management in addition to managing the catchment area [11][12][13]. The dredged sediment material is temporarily accommodated in one disposal area before being moved or used economically [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Sediment Dredging Activities of the PB Soedirman Banjarnegara Hydroelectric Reservoir Based on a Technical and Economic Points of View

Waluyo¹,

Zaenurrohman²,

Piranti³

et al. 2022

Preprint

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The PB Sudirman hydroelectric power plant, built in 1988, has fewer than 50 years of operational life. In contrast, the planned operating life for this dam is 50 years. This dam is experiencing intensive sedimentation, which results in siltation. Dredging efforts and catchment area management are conducted to extend the operational life of the dam. Therefore, technical and economic analysis of dredging activities and the potential benefits of dredged sediment is needed to determine the solution's effectiveness. We use the site survey method to conduct an environmental impact analysis and interviews with dam managers. The identification of the extent and distribution of erosion-sedimentation was carried out as part of the technical assessment. In the economic study, we calculate the dredging costs and profits from selling dredged sediments, mainly sand. The analysis results show that the dredging of deposits in the foreset slope area is not profitable. There are 17 areas of bank spoil that have economic benefits. This study concludes that the need for dredging costs on foreset slopes is higher than the profit from selling dredging sediments.

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Sedimentation and its response to management strategies of the Three Gorges Reservoir, Yangtze River, China

Cited by 67 publications

References 49 publications

Substantial burial of terrestrial microplastics in the Three Gorges Reservoir, China

Substantial burial of terrestrial microplastics in the Three Gorges Reservoir, China

Dynamics of Mid-Channel Bar during Different Impoundment Periods of the Three Gorges Reservoir Area in China

Analysis of the Sediment Dredging Activities of the PB Soedirman Banjarnegara Hydroelectric Reservoir Based on a Technical and Economic Points of View

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