On the cumulative dam impact in the upper Changjiang River: Streamflow and sediment load changes

Guo, Chao; Jin, Zhongwu; Guo, Leicheng; Lu, Jinyou; Shi, Rui; Zhou, Yongqiang

doi:10.1016/j.catena.2019.104250

Cited by 71 publications

(34 citation statements)

References 43 publications

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“…The morphology of river channels depends on many factors considered as dynamic in time and space. According to Montogomery & Buffington [1], river channel development predominantly replenished below the dam in form of bed erosion and, frequently, lateral erosion [19,23,[37][38][39][40][41][42][43]. Just downstream of the erosion zone, an accumulation reach tends to emerge, which usually displays features of a braided channel [44,45].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Dnieper Alluvial Riverbed Stability Affected by Intervention Discharge Downstream of Kaniv Dam

Obodovskyi

Habel

Szatten

et al. 2020

Water

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Along the middle reaches of the Dnieper River in central Ukraine, braided riverbeds with many islands have developed in alluvial valleys. In the 1970s, six dams were commissioned, and respective monitoring infrastructure was installed. Riverbanks and valley floors composed of unconsolidated material have much lower bank strengths and are susceptible to fluvial erosion and bank collapse, particularly during the release of high flow volumes from hydropower dams. The regulation of the Dnieper River along a cascade of storage reservoirs caused significant changes in its active river channel and hydrological regime. In order to estimate channel stability downstream of the Kaniv reservoir, we conducted an analysis of the hydraulic conditions in terms of changes in flow velocity and propagation of waves caused by intervention water discharges from the Kaniv Hydroelectric Power Plant (HPP). In this paper, we assess the hydromorphological parameters of the studied river reach as well as the characteristics of the related erosion and deposition zones. Therefore, a monitoring framework for channel processes (MCP) downstream of the Kaniv HPP was installed. The analysis of the intervention discharge parameters was conducted based on measurements from July 2015. Channel stability was expressed by the following factors: Lohtin’s number (L), Makkaveev’s (Kc) factor of stability, and a complex index of stability (Mx) by Grishanin. This study shows that the velocity of artificial wave propagation may reach a speed of up to 74.4 km·h−1. The wave propagates for a distance of approx. 45 km within 65 min at a mean velocity of 37.4 km·h−1. The L, Kc, and Mx indicators used in this work showed that when water discharge increased (e.g., during typical peak-capacity operation), the channel becomes unstable and sediments are subject to erosion processes. The riverbed stability indicators clearly illustrate that an increase in parameter values is not dependent on the distance to the dam. The results are valuable for sustainable sediment management at catchment scale and hence, directly applicable in water management.

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Section: Introductionmentioning

confidence: 99%

Assessment of the Dnieper Alluvial Riverbed Stability Affected by Intervention Discharge Downstream of Kaniv Dam

Obodovskyi

Habel

Szatten

et al. 2020

Water

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“…On the other hand, the retention of solids produced by reservoirs, which mainly belong to hydroelectric projects, modifies the transport of nutrients and organic matter [26]. The reduction in the granulometry of suspended sediment and the modification of the water regime leads to the transport of fine sediments [27], which may include heavy metals or others, resulting in the armoring of the riverbed and a modification of the river habitat that may endanger aquatic life as well as the riverbeds. In relation to other studies [9], the Grey Clustering method was able to determine sediment quality in Jiangsu province, the results show serious contamination, pointing to the agricultural, energy and mining industries as the source of contamination.…”

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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“…Despite their various benefits, dams often disrupt the continuity and sediment transport in the natural water system of rivers and lakes, which in turn play a considerable role in affecting the geomorphological and hydrodynamic changes, as well as the associated ecosystems [3][4][5]. Dams have become one of the most concerning human interferences in natural systems as the number of dams and total storage capacity increase rapidly [6,7].…”

Section: Introductionmentioning

confidence: 99%

Effects of a Proposed Hydraulic Project on the Hydrodynamics in the Poyang Lake Floodplain System, China

Zhao

2021

IJERPH

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Knowledge of dam construction in floodplain systems and its hydrodynamic effects plays a critical role in managing various kinds of floodplains. This study uses 3D floodplain hydrodynamic modeling to explore the possible effects of a proposed hydraulic project in Poyang Lake (PLHP) on the hydrodynamics, exemplified by a large floodplain system. Simulations showed that the water levels across most lake regions presented more significant changes than in the floodplain areas during the study period. The increased water levels upstream from the PLHP (~1.0 m) were distinctly higher than that downstream (~0.1 m). The PLHP may decrease the magnitude of the water velocities in the main channels of the lake, whereas velocities may experience mostly minor changes in the floodplains, depending upon the altered flow dynamics and transport. On average, the water temperature may exhibit mostly minor changes (~<1.0 °C) for both the horizontal and vertical scales within the flood-pulse-influenced lake system. Additionally, the model results indicated that the outflow process caused by the PLHP may be altered from the natural discharge into the Yangtze River to frequent backflow events during the storage period, demonstrating the non-negligible effect of the PLHP on the water supply for the downstream Yangtze River in the future.

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On the cumulative dam impact in the upper Changjiang River: Streamflow and sediment load changes

Cited by 71 publications

References 43 publications

Assessment of the Dnieper Alluvial Riverbed Stability Affected by Intervention Discharge Downstream of Kaniv Dam

Assessment of the Dnieper Alluvial Riverbed Stability Affected by Intervention Discharge Downstream of Kaniv Dam

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

Effects of a Proposed Hydraulic Project on the Hydrodynamics in the Poyang Lake Floodplain System, China

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