Refined operation of cascade reservoirs considering fish ecological demand

Li, Youkun; Lin, Jingfang; Liu, Yi; Yao, Weiwei; Zhang, Di; Peng, Qidong; Qian, Shangtuo

doi:10.1016/j.jhydrol.2022.127559

Cited by 21 publications

(6 citation statements)

References 72 publications

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“…At present, many studies have shown that there are contradictory risks involved in the operation of hydropower stations, such as the contradiction between the flood control risk in the upstream reservoir area and the flood control risk in downstream areas (Huang et al 2018), the contradiction between the flexibility of peak-shaving operation for the power grid and water level stability (Li et al 2021;Wang and Liu 2013), and the contradiction between the flow discharge approach required for ecological protection and the flow discharge approach that optimizes power generation efficiency (Li et al 2022;Wang et al 2014). However, most studies use reliability to quantify risk, ignoring other characteristics of system performance risk.…”

Section: Multi-risk Management For Cascade Hydropower Stationsmentioning

confidence: 99%

Multi-risk interaction analysis of cascade hydropower stations based on system dynamics simulation

Zhu¹,

Lin

Liu³

et al. 2023

Preprint

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The operation of cascade hydropower stations is accompanied by various target risks while exerting the comprehensive benefits of water resources. The systematic analysis of multi-risk interactions during the operation of cascade hydropower stations is helpful for improving the operational benefit of hydropower stations. However, the current hydropower operating model used for risk simulation cannot show the dynamic operation processes within the system, which may limit the popularization of the model. In addition, most existing studies define risk from the perspective of reliability and lack analyses of risk resilience and vulnerability. In this study, a system dynamics model of cascade hydropower stations is constructed, and the relationships among the multi-risk of the Xiluodu-Xiangjiaba (XLD-XJB) cascade hydropower stations are explored from the aspects of reliability, resilience and vulnerability. The results are as follows. (1) The system dynamics model can effectively simulate the dynamic process of system operation and can be used to study the performance risk changes in the operation process of hydropower stations. (2) The current operating rule leads to ecological risk and shipping risk in the system in the normal scenario. There are also power risks in wet and dry scenarios. (3) There is a contradiction between power risk and shipping risk. In addition, in the case of insufficient inflow, there is a contradiction between the reliability and vulnerability of power risk. (4) The regulation of ecological risk helps reduce shipping risk and power risk. Therefore, ecological outflow should be regarded as the minimum outflow requirement of cascade hydropower stations.

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Section: Multi-risk Management For Cascade Hydropower Stationsmentioning

confidence: 99%

Multi-risk interaction analysis of cascade hydropower stations based on system dynamics simulation

Zhu¹,

Lin

Liu³

et al. 2023

Preprint

Self Cite

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“…The defensive characteristics of this distinct structure and the cooperative protective mechanism between bony plates have not been studied. Previous studies on the Chinese sturgeon have primarily focused on its biological evolution, sex identification, and eco-environmental protection [ 25 , 26 , 27 ]. In this work, we present a detailed analysis of the structural morphology and protective mechanisms of the ventral bony plates of the Chinese sturgeon to experimentally assess their mechanical contribution to the defensive function and hope to provide motivation for designing bioinspired lightweight and high-strength protective structures.…”

Section: Introductionmentioning

confidence: 99%

The Armor of the Chinese Sturgeon: A Study of the Microstructure and Mechanical Properties of the Ventral Bony Plates

Yu¹,

Li²,

Liu³

et al. 2023

Micromachines

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Benefiting from their unique morphological characteristics and structural properties, the ventral bony plates of the Chinese sturgeon are excellent biological protective tissue. In this work, we studied the micro- and macro-morphology and mechanical properties of the ventral bony plates of the Chinese sturgeon to elucidate the special protective mechanisms of the bony plates. Experiments involving scanning electron microscopy and energy-dispersive X-ray spectroscopy revealed that the bony plates possess a hierarchical structure and a ridge-like shape. This structure comprises a surface layer containing mineralized nanocrystals and an internal layer containing mineralized collagen fibers. From the surface layer to the internal layer, the degree of mineralization decreases gradually. Nanoindentation, tension, and compression tests demonstrated that the bony plates feature excellent mechanical properties and a high specific tensile strength comparable to that of stainless steel. Moreover, water can significantly improve the fracture toughness and deformability of the bony plates and effectively enhance the damage tolerance of the structures. The obtained results concerning the microstructure–property–function relationships of the ventral bony plates of the Chinese sturgeon may provide novel insights for designing protective structures that are both lightweight and high strength.

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“…Field studies have been conducted in reservoirs, and a methodology for analyzing the formation of a depression curve has been developed, considering changes in the water level in the reservoir [5,6]. The operation of reservoir cascades is analyzed based on the known theory of control, considering the specific conditions of the economy and social and economic aspects of the region [7][8][9][10]. Water-retaining structures could hazard hydrological, hydraulic, structural, filtration, and channel systems [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Determination of the time of lowering depression surface in transition zones with a smooth and instantaneous decrease in water level in reservoir

2023

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The Republic of Uzbekistan pays great attention to the development and implementation of a program for the development of hydropower based on ensuring the share of hydropower in the energy potential and the integrated development of hydropower potential. Over the last three years, hydropower plants have been built or reconstructed in more than a dozen small and medium-sized earth dams to accomplish this task. Typically, unstable filtration is observed in the body of earth dams because of deviations from the normal filling and emptying of water reservoirs. The main goal of the research is to determine the time to lower the depression surface in the Tupalang earth dam transition zones, which characterizes the intensity of unstable filtration during a smooth and sudden drop in reservoir water level. The calculations were made according to the theoretical dependences of V.P.Nedriga for two cases of smooth and sudden lowering of the water level in the reservoir, starting from the normal backed level (NBL). In the calculations, the values of the main parameters were taken to be the coefficient of water loss of the soil (0.3), the coefficient of filtration of the transition zones (9.5 m/day), and the coefficient of laying the slope of the transition zones (0.2). Calculations showed that the time of lowering the depression surface in the transition zones with a gradual decrease in the water level in the reservoir was 84.1 days, and with an instantaneous decrease in the water level during the operation of a dam with a height of 120 m 3.86 days, and during the operation of a dam with a height of 185 m 6.82 days.

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Refined operation of cascade reservoirs considering fish ecological demand

Cited by 21 publications

References 72 publications

Multi-risk interaction analysis of cascade hydropower stations based on system dynamics simulation

Multi-risk interaction analysis of cascade hydropower stations based on system dynamics simulation

The Armor of the Chinese Sturgeon: A Study of the Microstructure and Mechanical Properties of the Ventral Bony Plates

Determination of the time of lowering depression surface in transition zones with a smooth and instantaneous decrease in water level in reservoir

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