Unexpected sedimentation patterns upstream and downstream of the Three Gorges Reservoir: Future risks

Huang, Yu-Jung; Wang, Jinsheng; Yang, Mei

doi:10.1016/j.ijsrc.2018.05.004

Cited by 30 publications

(12 citation statements)

References 28 publications

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“…Particularly, the summer flood season (June to September) received over 80% of annual sediments from upstream. Longitudinal decrease of water velocity and increase of water retention time in such hydromorphological characteristics cause the large deposition of input sediments (or TPM) in the middle part of the reservoir, particularly from FL to ZX (Huang et al, 2019; Li et al, 2018). Both of our field observations and modeling work evidently supported the above inference.…”

Section: Discussionmentioning

confidence: 99%

“…Over 60% of inflow water and nearly 70% of sediments are from upstream of the Yangtze mainstem (Figure 1). Together with the two large tributaries, that is, the Jialing and Wu Rivers (Figure 1), over 80% of inflow and sediments are input from the upper part of the TGR (Huang et al, 2019; Li et al, 2018). Particularly, the summer flood season (June to September) received over 80% of annual sediments from upstream.…”

Section: Discussionmentioning

confidence: 99%

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Imbalanced Stoichiometric Reservoir Sedimentation Regulates Methane Accumulation in China's Three Gorges Reservoir

et al. 2020

Water Resources Research

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The river-reservoir continuum drives a separation of sedimentation along the longitudinal hydrodynamic gradients, potentially causing imbalanced stoichiometric sedimentation. However, there are still uncertainties regarding the contribution of imbalanced stoichiometric sedimentation to methane emissions along this continuum. A 2-year field survey and in situ experiments were conducted in China's Three Gorges Reservoir (TGR), a river-valley-dammed reservoir. Sediments were trapped and collected to analyze for particulate carbon (C), nitrogen (N), and phosphorus (P) concentrations of different sizes in the summer flooded and winter dry seasons along the mainstem. Large amounts of sediments were deposited in the middle part of the TGR, particularly in the summer flood season. Hydrodynamic gradients structured imbalanced stoichiometric sedimentation patterns. Averaged particulate C:N:P proportions in the sediment layer along the upper, middle, and lower parts of the TGR in the first 30 years of reservoir operation were estimated to be 68:7:1, 97:8:1, and 151:13:1, respectively. The middle part of the TGR, being the "control point" of methane accumulation based on seasons, exhibited a shift in stoichiometry and stable isotope signatures, indicating that there was likely a shift in sources of POM. P, specifically in smaller size particles (<10 μm), seemed to be the potential key driver that regulates particulate C:N:P in the sediment of the TGR. Its sedimentation, primarily in the middle part of the TGR, contributed to the significant decreases in particulate C/P ratios and could possibly regulate long-term CH 4 accumulation in the reservoir.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Imbalanced Stoichiometric Reservoir Sedimentation Regulates Methane Accumulation in China's Three Gorges Reservoir

et al. 2020

Water Resources Research

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“…On the other hand, hydroelectric power plant reservoirs have serious sediment accumulation problems [23], and their cleaning and treatment is complicated by the accumulation of heavy metals [24], and if the upstream sediment flow is not properly managed. Then water outflows could affect the health of the aquatic ecosystem located downstream, and several ecotoxicological studies [25] on organisms, mainly fish, even endanger the health of nearby populations, such as those in the Uchiza population center.…”

Section: Points Of Monitoringmentioning

confidence: 99%

Grey Clustering Approach to Assess Sediment Quality in a Watershed in Peru

Delgado¹,

Altaminarano²,

Pariona³

et al. 2021

IJACSA

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The evaluation of sediment quality is a relevant topic that involves the analysis of various parameters that are altered by natural or anthropogenic causes. Therefore, the Grey Clustering method provides an alternative to evaluate sediment quality. In the present study, the sediment quality of the Chontayacu river watershed was evaluated considering the results of the monitoring of twenty-three points carried out in the early evaluations by the Environmental Impact Evaluation Agency (OEFA by its Spanish acronym). These twenty-three points were separated into three blocks considering the monitoring points upstream of the Uchiza town center and the Chontayacu Alto and Chontayacu Bajo hydroelectric plants. Seven parameters were analyzed: As, Cd, Cr, Cu, Pb, Hg and Zn, which were compared with Canadian sediment quality standards for the protection of aquatic life. The results of the assessment showed that all points in the Chontayacu River were classified as having unlikely adverse biological effects from heavy metals. However, a quality ranking was established between the points of each block where it was found that points P3, P4 and P17 correspond to the lowest values for the high CH, low CH and CP Uchiza blocks respectively. Finally, the results obtained will provide integrated information for decision making by the competent authorities in Peru, as well as indicate the level of sediment contamination that should be taken into account for the proposal of hydroelectric projects that influence sediment transport and entrainment.

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“…De Cassia Condé et al (2019) used MODIS remote sensing images to indirectly evaluate the sedimentation of hydropower dams, and studied the relationship between turbidity reduction and sedimentation, and indicated that this technology can be used to monitor large-scale sedimentation processes in reservoirs. Several researchers have also analyzed the process of sedimentation in reservoirs and the joint operation model (Chen et al, 2017;Huang et al, 2019;Khorrami & Banihashemi, 2019;Tadesse & Dai, 2019;Wang & Hu, 2009). However, the principles of sediment avoidance diversion, coordinated dispatch of water, and sedimentation associated with injected water supply projects need to be further enhanced.…”

Section: Introductionmentioning

confidence: 99%

A study on sediment avoidance diversion and the coordinated dispatch of water and sediment at an injection-water supply project on a sediment-laden river

Guo

et al. 2021

Engineering Applications of Computational Fluid Mechanics

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Rivers in the northwestern region of China have a high sediment content, and the construction of reservoirs on these rivers must address the problem of sedimentation that results in a loss of reservoir capacity. In this study, the YZD (Yazidang) reservoir was considered as a typical case, to address the problem of sedimentation in injection-type water supply reservoirs in Northwest China. The temporal and spatial characteristics of the sediment in this water diversion project were analyzed based on available 46-year water and sediment data. The concept of 'sediment avoidance diversion' was proposed, which reduces the entry of sediment into the reservoir. A one-dimensional numerical model for water-sediment coupling was established, and the characteristics of water-sediment erosion and deposition for different operational modes were analyzed. The results show that during a period of high sediment content, large-scale siltation occurs in a water diversion channel. To alleviate sediment deposition in a diversion channel, two control strategies for mitigating siltation were formulated. Considering the pros and cons of these control strategies, a reasonable water-sediment joint operation plan has been proposed to extend the service life of the YZD reservoir. This research provides a theoretical basis for sedimentation treatment and control of similar reservoirs.

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Unexpected sedimentation patterns upstream and downstream of the Three Gorges Reservoir: Future risks

Cited by 30 publications

References 28 publications

Imbalanced Stoichiometric Reservoir Sedimentation Regulates Methane Accumulation in China's Three Gorges Reservoir

Imbalanced Stoichiometric Reservoir Sedimentation Regulates Methane Accumulation in China's Three Gorges Reservoir

Grey Clustering Approach to Assess Sediment Quality in a Watershed in Peru

A study on sediment avoidance diversion and the coordinated dispatch of water and sediment at an injection-water supply project on a sediment-laden river

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