Mitigation of ecological impacts on fish of large reservoir sediment management through controlled flushing – The case of the Verbois dam (Rhône River, Switzerland)

Cattanéo, Franck; Guillard, Jean; Diouf, Seydina; O'Rourke, Jane; Grimardias, David

doi:10.1016/j.scitotenv.2020.144053

Cited by 28 publications

(16 citation statements)

References 70 publications

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“…[11,18,19] Reduces of sediment transport Would reduce the sediment transport by 75%-92% in downstream area. [12,20,21] Changes sediment dynamics and geomorphic processes Could cause retreatment of estuarine turbidity maximum zone and lead to erosion that degrades the underwater deltas in estuaries.…”

Section: Characteristicsmentioning

confidence: 99%

“…About 77% sediment was trapped by the Three Gorges Reservoir [53]. Similarly, studies of sediment transport in Swiss rivers [21], Russian rivers [22], European rivers [23], North African rivers [24] and South East Asian rivers [25] have shown that anthropogenic disturbances in river basins (mainly dam and reservoir construction) are the main causes of reductions in sediment transport.…”

Section: Effects Of Dam Construction On Sediment Flux Into the Oceanmentioning

confidence: 99%

“…At the same time, reasonable release of stored water during the growth of diatoms can avoid Si limitation in the diatom communities of estuaries and adjacent sea areas [66]. In addition, targeted control of sediment flushing operations and removing tributary low-head dams could decrease harm to ecosystems in downstream reaches [21,67]. The banning fishing activities of the Yangtze River and the removal of unnecessary dams (obsolete or small dams) are means of balancing social benefits and environmental health [68,69].…”

Section: Management Strategiesmentioning

confidence: 99%

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Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

Zhang¹,

Fang²,

Wang³

et al. 2022

Preprint

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Dams have made great contributions to human society, facilitating flood control, power generation, shipping, agriculture and industry. However, the construction of dams greatly impacts downstream ecological environments and nearby marine areas. To summarize these impacts, this review used recent research to comprehensively analyze how dam construction has affected river hydrology, geomorphology, and ecosystem of downstream reaches globally. Effects of dams on ecosystems occur through reduced river flow, reduced sediment flux, altered water temperature, changed estuary delta, altered composition and distribution of nutrients, altered structure and distribution of phytoplankton populations, caused habitat fragmentation, and blocked migration routes in river sections and adjacent seas. Besides, exploring new reservoir management strategies (including targeted control of dam storage and flushing sediment operations), banning fishing activities, and removing unnecessary dams (obsolete or small dams) are becoming crucial tools for ecosystem restoration.

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Section: Characteristicsmentioning

confidence: 99%

Section: Effects Of Dam Construction On Sediment Flux Into the Oceanmentioning

confidence: 99%

Section: Management Strategiesmentioning

confidence: 99%

See 1 more Smart Citation

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

Zhang¹,

Fang²,

Wang³

et al. 2022

Preprint

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“…(Morris, 2014). Some measures to minimize these impacts by carefully determining the timing, duration, and frequency of flushing and controlling the releasing discharge and concentration can be found in Morris (2014), Moridi and Yazdi (2017), Espa et al (2019), andCattanéo et al (2021). The theme of this paper, to secure water supply while enhancing desilting, acts similarly as mitigating environmental impacts, since they both need to restrain the effectiveness of empty flushing.…”

Section: Validation Of the Optimal Strategiesmentioning

confidence: 99%

Minimizing the impact of vacating instream storage of a multi-reservoir system: a trade-off study of water supply and empty flushing

Chou

Lee

2021

Hydrol. Earth Syst. Sci.

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Abstract. A reservoir operator does not favor storage above a certain level in situations such as the pre-release operation prior to a flood; scheduled engineering construction; or mechanical excavation of sediment in the impoundments, drawdown, and empty flushing, etc. This paper selects empty flushing as the case study, and a method is presented to promote the feasibility of emptying the reservoir storage. The impact of emptying reservoir on water supply is minimized through appropriate joint operation in a multi-reservoir system, where drawdown and empty flushing is carried out in a primary reservoir, and the other reservoir provides backup water for supply. This method prioritizes allocating the storage in the primary reservoir for water supply during specific periods prior to its emptying. If the storage of every reservoir achieves its predefined conditions, drawdown of the primary reservoir is activated and followed by empty flushing. Previously preserved storage in the other reservoir ensures adequate water supply during the periods of emptying the primary reservoir. Flushing of the primary reservoir is continued until either the accumulative released water exceeds the specified volume, storage in the backup reservoir drops below the predefined threshold, or the inflow to the primary reservoir recedes from the flood peak to be below the releasing capacity of outlets. This behavior is simulated and linked with a nonlinear optimization algorithm to calibrate the optimal parameters defining the activation and termination of empty flushing. The optimized strategy limits the incremental water shortage within the acceptable threshold and maximizes the expected benefits of emptying reservoir.

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“…1,2 In China, there are 98,002 reservoirs of various types built and under construction, of which 756 are large-scale, 3938 are medium-sized, and 93,308 are small-scale, with a total storage capacity of 932.312 billion m 3 . So far, some reservoirs have some serious problems, which will lead to dam break, 3 such as facilities aging, 4 disrepair, reservoir siltation, 5 and culvert leakage.…”

Section: Introductionmentioning

confidence: 99%

Dynamic risk assessment of slope stability of homogeneous earth-rock dam under action of multiple hazards

Zhang

Liu

2022

SIMULATION

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During actual service of the reservoir dam, there always appears a combination of water level fluctuations, rainfalls, and other hazard factors. During these times, the safety state of the dam is a dynamic process, and the dynamic risk assessment of dam slope stability which considers the time scale is of great importance. Therefore, in this study, the dynamical stability of the earth-rock dam under the combined action of multiple hazards is studied by using the Monte Carlo method, considering the spatial variability of the soil of dam and the coupling effect of the seepage field and the stress field. The failure probability and reliability index of dam under each working condition are calculated to determine the most dangerous working condition during the disaster-causing process. For the upstream slope, the most dangerous condition appears at the moment when the water level drops at a rate of 2 m/d with a 40 mm/d rainfall intensity, while the most dangerous condition of the downstream slope is that when the water level rises at a rate of 2 m/d with a 40 mm/d rainfall intensity. The influence of various disaster factors on the stability of dam is revealed and corresponding engineering early warning measures are proposed. This study realizes the dynamic risk assessment of dam slope stability under multiple hazards, avoids the limitation of evaluating the dam slope stability with a single safety factor, and provides a reference for risk analysis and emergency management of reservoir dams under the action of multiple hazards.

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Mitigation of ecological impacts on fish of large reservoir sediment management through controlled flushing – The case of the Verbois dam (Rhône River, Switzerland)

Cited by 28 publications

References 70 publications

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

Review of Effects of Dam Construction on the Ecosystems of River Estuary and Nearby Marine Areas

Minimizing the impact of vacating instream storage of a multi-reservoir system: a trade-off study of water supply and empty flushing

Dynamic risk assessment of slope stability of homogeneous earth-rock dam under action of multiple hazards

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