Academic literature on the topic 'Reservoir sediment flushing'
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Journal articles on the topic "Reservoir sediment flushing"
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Esmaeili, Taymaz, Tetsuya Sumi, Sameh A. Kantoush, and Yoji Kubota. "Free-Flow Sediment Flushing: Insights from Prototype-Scale Studies." Journal of Disaster Research 13, no. 4 (August 1, 2018): 677–90. http://dx.doi.org/10.20965/jdr.2018.p0677.
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Free-flow sediment flushing operation offers viable means to preserve the storage capacity of dam reservoirs as the incoming flood erodes the flushing channel, and the deposited sediment is flushed from the reservoir. This method involves complex flow patterns and flushing channel formation procedures owing to the dynamic interaction between varying flow conditions (e.g., shallow and deep flows) and moveable bed variations notably when the non-uniform sediments exist in the complex geometry of reservoirs. In the present study, first, the numerical simulation of a previously conducted free-flow sediment flushing operation in the Dashidaira and the target segment of Unazuki reservoirs using the available field-measured data were presented. Then, to improve the flushing efficiency in the Dashidaira reservoir, the effects of using a groyne were studied. A fully 3D numerical model using the finite volume method in combination with a wetting/draying algorithm was utilized to reproduce the flow velocity field and morphological bed changes. While the characteristics of the flow field can be captured by the numerical model in Dashidaira and Unazuki reservoirs, simulated bed changes in upstream areas covered with the coarser materials (e.g., study zone of Unazuki reservoir) showed some discrepancies. The outcomes also revealed that implementing a groyne at the entrance of the wide midstream of Dashidaira reservoir can locally increase the sediment erosion chance from this area and thereby can improve the flushing efficiency by approximately 10%. Therefore, the risks associated with the accumulation of distorted sediments in the wide midstream of Dashidaira reservoir within a long-term period could be reduced.
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Lu, Liyu, Chunhua Tao, and Weibin Huang. "Study on Flood and Sediment Joint Operation of Dadu River Downstream Cascade Reservoirs." MATEC Web of Conferences 246 (2018): 01082. http://dx.doi.org/10.1051/matecconf/201824601082.
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There is large amount of high hardness sand in the water flow in Dadu river. The problem of sediment deposition is very prominent in the two early reservoirs, Gongzui reservoir and Tongjiezi reservoir. In order to decrease sediment deposition effectively and extend the service life of them, the sediment characteristics of Dadu river cascade hydropower stations are analysed, as well as changes of sediment deposition in Gongzui reservoir and Tongjiezi reservoir after Pubugou reservoir puts into operation. Flood forecast and pre-discharge operation theory are studied for utilizing the discarding water to improve sediment-flushing effect, and flood and sediment joint dispatching schemes of cascade reservoirs are proposed. In order to evaluate effects of joint dispatching schemes, SBED extended one-dimensional flushing sediment mathematical model of deposited reservoir is built, and the mathematical model is used for simulative computation of coming 20-years sediment-flushing effect. After that, the effects of different schemes are analyzed comparatively. Three conclusions can be drawn from the studying. Firstly, the sediment in Gongzui reservoir and Tongjiezi reservoir is obviously reduced after Pubugou reservoir puts into operation. Secondly, flood forecast, pre-discharge operation theory and creating sand-flushing conditions can obviously improve sediment-flushing effects and avoid wasting power generation water when the water levels and outflows of Pubugou reservoir, Gongzui reservoir and Tongjiezi reservoir are rationally controlled. Finally, the larger the inflows and the lower the water level of Gongzui reservoir and Tongjiezi reservoir is, the more obvious the sediment-flushing effects are. According to situations of power plant at the time, such as rules of flood controlling and operation requirements of flood discharge facilities, it is recommended that the inflow of Gongzui reservoir is controlled at about 4500m3/s, and timely lower the water levels of Gongzui reservoir and Tongjiezi reservoir to their dead water levels, when carrying out joint dispatching schemes.
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Hussain, Kashif, and Muhammad Shahab. "Sustainable sediment management in a reservoir through flushing using HEC-RAS model: case study of Thakot Hydropower Project (D-3) on the Indus river." Water Supply 20, no. 2 (November 27, 2019): 448–58. http://dx.doi.org/10.2166/ws.2019.174.
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Abstract To increase the life of small storage reservoirs, sediment flushing is found to be a very useful technique throughout the world. A sediment flushing study of the Thakot D-3 Hydropower Project reservoir after construction of the Dasu dam on the Indus river is presented in this paper. HEC-RAS 5.0.6 numerical model has been employed to check the sediment removal during flushing and to assess the model's applicability and limitations. Dasu reservoir sediment discharge data of 20 years were used to evaluate the sediment load with different transport functions under no-flushing (FSL 656 m asl) and flushing conditions. Without flushing, the river bed would be raised 56.1 m at the dam site and the low-level spillway and power intake would be filled in 2–5 years' time. It was observed that reservoir sediment flushing is economically realistic for this dam and the HEC-RAS sediment simulation model is encouraged for reservoir flushing modeling. If the Thakot D-3 HPP is commissioned a number of years after Dasu, a coarser sediment load will also be reached in the reservoir which could pose a serious challenge for the Thakot D-3 reservoir life. It is recommended that without construction of the Bhasha-Diamer storage dam, sedimentation not only is a complicated issue for Dasu HPP and Thakot D-3 HPP, but will also have drastic impacts on other downstream run-of-river energy projects.
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Esmaeili, Taymaz, Tetsuya Sumi, Sameh A. Kantoush, Yoji Kubota, Stefan Haun, and Nils Rüther. "Numerical Study of Discharge Adjustment Effects on Reservoir Morphodynamics and Flushing Efficiency: An Outlook for the Unazuki Reservoir, Japan." Water 13, no. 12 (June 9, 2021): 1624. http://dx.doi.org/10.3390/w13121624.
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The Unazuki Reservoir is located on the Kurobe River, which is influenced by a catchment with one of the highest sediment yields in Japan. Due to a sufficiently available discharge during flood events, annual sediment flushing with full water-level drawdown (i.e., free-flow sediment flushing) is conducted to preserve the effective storage capacity of the reservoir. Nevertheless, the upstream half of the reservoir (i.e., study segment) suffers from the excessive deposition of coarser sediments. Remobilization of these coarser materials and their transportation further downstream of the reservoir is a priority of reservoir owners for sustainable reservoir functions, such as flood-risk management and hydroelectric energy generation. In this paper, an already conducted sediment-flushing operation in the Unazuki Reservoir is simulated, and its effects on sediment scouring from the study segment of the reservoir together with changes in bed morphodynamics are presented. A fully 3D numerical model using the finite volume approach in combination with a wetting/drying algorithm was utilized to reproduce the hydrodynamics and bed changes using the available onsite data. Afterwards, the effects of discharge adjustment on the morphological bed changes and flushing efficiency were analysed in the study segment using an additional single-discharge pulse supplied from upstream reservoirs. Simulation results showed that an approximately 75% increase in the average discharge during the free-flow stage changed the dominant morphological process from deposition into an erosive mode in the study segment. If the increase in discharge reaches up to 100%, the flushed volume of sediments from the target segment can increase 2.9 times compared with the initiation of the erosive mode.
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Setiawan, Ery, Syamsul Hidayat, Ida Bagus Giri Putra, Muhammad Bagus Budianto, and Salehudin. "Evaluation of sediment management for two large reservoirs in Lombok island." MATEC Web of Conferences 195 (2018): 05002. http://dx.doi.org/10.1051/matecconf/201819505002.
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Sedimentation is an important issue in reservoir rehabilitation and maintenance. This problem is worsened by seasonal water scarcity as a characteristic of arid catchments. Worldwide loss of storage capacity due to sedimentation is much higher than the increase of capacity by the construction of new reservoirs. Further, sedimentation hinders the safe operation of not only shallow reservoirs but also deep reservoirs by means of turbidity currents which sporadically transport large volumes of sediments down to the dams. This study analyses the real case of Pengga reservoir and Batujai reservoir located in Central Indonesia. Selected sediment management alternatives were analysed and evaluated based on technical, social and environmental criteria. Evaluation of sediment management alternatives was conducted by utilising the REServoir CONservation (RESCON) tool. Results showed that, first, both flushing techniques and hydrosuction are feasible whereas dredging and trucking are not. Secondly, the flushing technique outweighs the Hydrosuction Sediment Removal (HSRS) method. Thirdly, application of the HSRS method in both reservoirs shares one thing in common, i.e. it requires an appropriate combination of the number of suction pipes as well as minimum suction pipe diameters. Lastly, there are some differences in the details of implementation of the flushing technique to both reservoirs.
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Atmodjo, Pranoto S., Sri Sangkawati, and Kirno Kirno. "PERBANDINGAN EFEKTIFITAS HASIL PENGGELONTORAN SEDIMEN DI WADUK CARA FLUSHING DAN SLUICING." Teknik 34, no. 2 (September 13, 2013): 66. http://dx.doi.org/10.14710/teknik.v34i2.5627.
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This study compares the effectiveness of the flushing of sediment in the reservoir by means of flushing andSluicing way, based on Physical Hydraulic Test (Model Test) in the laboratory. Flushing is removingaccumulated deposited sediment. While slucing is releasing of sediment through the reservoir beforesettled or keep sediment remain in suspension and its occur during flood period. Sediments FlushEffectiveness represented by the percentage of released sediment by sediment deposited or the amount ofsediment entering the reservoir during the flushing period.The model based on the prototipe from DetailDesign of Structural Countermeasures for Sedimentation on Wonogiri Reservoir by Nippon Koei 2009.Running model duration is one hour, used free flow and submergence condition, with discharge variationQ=100, 200 and 400 m3/s. Sluicing experiments conducted with some 60 liters of sediment sprinkle evenlywide flow, and Flushing implemented by 2,00 m thickness of deposited sediment that spreaded over thereservoir bottom before running. From this research showed that Sluicing way more efficient than theflushing way, where the number of efficiency of sediment Sluicing way bigger than the efficiency offlusing way, in the running an hour in the laboratory test
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Wang, Hsiao-Wen, Bing-Shiou Tsai, Charnsmorn Hwang, Guan-Wei Chen, and Wei-Cheng Kuo. "Efficiency of the Drawdown Flushing and Partition Desilting of a Reservoir in Taiwan." Water 12, no. 8 (July 31, 2020): 2166. http://dx.doi.org/10.3390/w12082166.
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Sedimentation limits the benefits of storage reservoirs, especially in areas with higher sediment yields, such as Agongdian Reservoir in southern Taiwan. Although drawdown flushing is a known strategy that releases large amounts of fine sediment into a downstream channel, there is limited information on the long-term monitoring and multiple metrics being used to evaluate flushing efficiency. The objectives of this study were three-fold: (1) to continue collecting valuable long-term observed data, since Agongdian Reservoir is one of the few reservoirs currently conducting sediment flushing operations; (2) to evaluate and identify the hydrological parameters that are highly related to the flushing efficiency; (3) to execute numerical simulations of different reservoir flushing scenarios at multiple water levels to discuss potential strategies to improve the flushing efficiency. The findings of this study revealed that long-term monitoring data was valuable for identifying factors highly related to the flushing efficiency, which included the initial water level; average water level; average velocity. Based on simulations, compartmentalizing the reservoir is a proposed strategy that has demonstrated high levels of improvement in terms of the flushing efficiency, depending on particular scenarios involving partition desilting, empty flushing, or a combination of both. Recommendations to increase the flushing efficiency include lowering the initial water level, creating a narrower gorge-like geometry by partitioning, and further considering to modify the operation rules.
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Utomo, Puji. "Mrica Reservoir Sedimentation: Current Situation and Future Necessary Management." Journal of the Civil Engineering Forum 3, no. 2 (September 12, 2017): 365. http://dx.doi.org/10.22146/jcef.26640.
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Mrica Reservoir is one of many reservoirs located in Central Java that experienced a considerably high sedimentation during the last ten years. This condition has caused a rapid decrease in reservoir capacity. Various countermeasures have been introduced to reduce the rate of the reservoir sedimentation through catchment management and reservoir operation by means of flushing and/or dredging. However, the sedimentation remains intensive so that the fulfillment of water demand for electrical power generation was seriously affected. This paper presents the results of evaluation on the dynamics of the purpose of this research is to evaluate the sediment balance of the Mrica Reservoir based on two different scenarios, i.e. the existing condition and another certain type of reservoir management. The study on sediment balance was carried out by estimating the sediment inflow applying sheet erosion method in combination with the analysis of sediment rating curve. The measurement of the deposited sediment rate in the reservoir was conducted through the periodic echo sounding, whereas identification of the number of sediment that has been released from the reservoir was carried out through the observation on both flushing and dredging activities. The results show that during the last decade, the rate of the sediment inflow was approximately 5.869 MCM/year, whereas the released sediment from the reservoir was 4.097 MCM/year. In order to maintain the reservoir capacity, therefore, at least 1.772 MCM/year should be released from the reservoir by means of either flushing or dredging. Sedimentation management may prolong the reservoir’s service life to exceed the design life. Without sediment management, the lifetime of the reservoir would have finished by 2016, whereas with the proper management the lifetime may be extended to 2025.
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NOH, M. N. MD, Masanori MICHIUE, Osamu HINOKIDANI, and Takahito TSUJI. "SEDIMENT FLUSHING FOR STEEP SLOPE RESERVOIR." PROCEEDINGS OF HYDRAULIC ENGINEERING 46 (2002): 1211–16. http://dx.doi.org/10.2208/prohe.46.1211.
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Hauer, Christoph, Marlene Haimann, Patrick Holzapfel, Peter Flödl, Beatrice Wagner, Michael Hubmann, Bernhard Hofer, Helmut Habersack, and Martin Schletterer. "Controlled Reservoir Drawdown—Challenges for Sediment Management and Integrative Monitoring: An Austrian Case Study—Part A: Reach Scale." Water 12, no. 4 (April 8, 2020): 1058. http://dx.doi.org/10.3390/w12041058.
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For Europe, a reduction of 80% of the potential storage volume due to reservoir sedimentation is predicted by 2080. Sedimentation processes trigger the decrease of the storage volume and a related restriction in hydropower production. Further, the artificial downstream flushing of deposited fines has manifold effects on the aquatic ecology, including changes in morphology and sediment quality, as well as increased turbidity and subsequent stress for aquatic species. However, it is common to lower the water surface of reservoirs for technical inspections, which is not comparable to reservoir flushing operations. The presented case study deals with such a controlled drawdown beyond the operational level of the Gepatsch reservoir (Tyrol, Austria). Based on the awareness of possible ecological consequences, an advanced set of measures and an integrative monitoring design, consisting of a detailed event-based quantification of suspended sediments, changes in the morphology, especially with respect to fine sediments, and analyses of the biological quality element fish on the reach scale along the Inn River have been developed.
Dissertations / Theses on the topic "Reservoir sediment flushing"
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Tarekegn, Tesfaye Haimanot. "Downstream suspended sediment dynamics of reservoir sediment flushing." Thesis, Queen Mary, University of London, 2016. http://qmro.qmul.ac.uk/xmlui/handle/123456789/12963.
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Reservoir sediment flushing is increasingly considered beneficial to reduce sedimentation of reservoirs and maintain sediment supply downstream of impounded rivers. Nevertheless, flushing of the accumulated sediments downstream of the dam also bears numerous negative impacts. In this study, first the most important downstream impacts of fine sediment releases of flushing were identified based on previously published research of twenty case studies in eleven countries. The results showed that the long-term as well as short term biological and physical impacts decreased with distance from the dam. The temporal scale of impacts on macro-invertebrates could span from few weeks or a month to several months while the effect on fish could last for a number of years. The impacts on downstream vegetation dynamics is driven by many years of flushing activities. The study also enabled proposing generic management strategies aimed to reduce the impacts. Second, fine sediment transport in coarse immobile bed, which is a common phenomenon downstream of dams during flushing releases, dam removal and also in many mountain and canyon rivers, was investigated. Particularly, the dynamics of the downstream erosion and transport of fine sediments released during sediment flushing was investigated based on a series of flume experiments that were carried out in immobile gravel bed and using a one-dimensional (1-D) suspended sediment transport model developed in the present study. In the framework of the flume experiment, firstly gravel bed roughness, porosity and roughness density were exclusively extracted from gravel surface elevation data in which developing a spatial filter to overcome elevation errors was carried out. Secondly a new technique to acquire fine sediment erosion in immobile coarse bed in running water condition was developed. The method proved to be the back bone of all fine sediment erosion experiments conducted in the present study and could be used for similar studies. This study presents a first work of direct measurement of erosion rate and characterizing its spatial heterogeneity in gravel bed. The experimental data of erosion rate of fine sediments showed that it varied spatially with high erosion rate on the stoss side of gravels and less on the lee side conforming to sweeps and ejections characteristics in coherent flow structure of gravel bed flows. Erosion rate was significantly affected by increase in roughness of immobile gravel bed with high erosion rate noticed when sand level was reduced although the effect on stream-wise velocity was not significant. The vertical profile of erosion rate was found to decrease linearly and showed an exponential decay in time in the gravel matrix. Third, a new non-equilibrium erosion rate relation is proposed. Drag force profile in the interfacial sublayer of clean gravel bed was found to be scaled well with roughness density and allowed predicting the effective shear stress distribution available for fine sediment entrainment with an empirical equation. vi The new relation is a modified version of the pick-up rate function of van Rijn (1984b) in which the predicted shear stress in the roughness layer was implemented. The most important finding was that if the shear stress distribution in the interfacial sublayer is predicted, a relation for sand bed condition can be applied to predict fine sediment erosion rate in immobile gravel bed. This approach is conceptually superior to previous approaches where erosion rate in sand bed condition was scaled empirically for various fine sediment bed level within the interfacial sublayer. Finally, the effect of the interaction between hydrodynamic and sediment wave dynamics of sediment flushing on spatial pattern of sediment deposition was investigated. The 1-D model was developed to include major processes observed in sediment flushing: sediment wave celerity correction, variable bed roughness, bed exchange in immobile bed, hindered settling velocity and rough bed porosity. The proposed erosion rate relation showed encouraging results when implemented in the 1-D model. The wave celerity factor did not show significant effect on the spatial lag in immobile bed condition although was significant in sand bed condition. Variable bed roughness modified both the flow field and sediment deposition in which larger length of sediment deposit was noted. The immobile bed porosity allowed modelling clogged depth of fine sediments. The model was also found to be very valuable to investigate flushing scenarios that reduce significant deposition through the analysis of the dependence of deposition on peak-to-base flow and intermittence of releases. The highest peak-to-base flows produced the longest and thickest region of deposition while those with the lowest ratio produced the shortest and thinnest. A single flushing release followed by clear water release reduced area or length of sediment deposition more than intermittent flushing followed by inter- and post-flushing clear water releases. In the latter case, the peak of concentration reduced but remained higher for longer duration than the former, which suggests that a large quantity of clear water release has to be available. Overall, the present research represents a step forward in understanding relevant processes involved in the downstream transport of fine sediments released during sediment flushing and the associated impacts that can help the development of better management strategies and predictive tools.
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Taymaz, Esmaeili. "THREE-DIMENSIONAL NUMERICAL STUDY ON FREE-FLOW FLUSHING FOR ENHANCING THE EFFICIENCY OF SEDIMENT MANAGEMENT IN RESERVOIRS." 京都大学 (Kyoto University), 2015. http://hdl.handle.net/2433/202697.
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Guertault, Lucie. "Évaluation des processus hydro-sédimentaires d’une retenue de forme allongée : application à la retenue de Génissiat sur le Haut-Rhône." Thesis, Lyon 1, 2015. http://www.theses.fr/2015LYO10143/document.
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Cette thèse a pour objectif de caractériser les processus dominants dans l'évolution morphologique d'une retenue de forme allongée. Ces retenues sont caractérisées par une dimension longitudinale prédominante par rapport à la dimension transversale. La thèse s'est appuyée sur le cas de la retenue de Génissiat, située au cœur d'une série d'aménagements hydro-électriques sur le Haut-Rhône et soumise à des opérations régulières de chasses hydrauliques. Une analyse hydro-morphologique basée sur l'interprétation des évolutions morphologiques et des conditions d'écoulement a été réalisée. A partir de cette analyse, un découpage de la retenue en tronçons a permis de mettre en évidence la dynamique spatiale des sédiments au sein de la retenue. Une analyse de la dynamique spatio-temporelle du transport des sédiments a permis de quantifier et de caractériser les flux de transportés et leurs incertitudes. La contribution des processus associés au transport des différentes classes granulométriques (sables et sédiments fins) a alors été évaluée. Enfin, deux modèles numériques unidimensionnels ont été développés afin de simuler les processus dominants pour le transport des sédiments fins et des sédiments grossiers. Les résultats de modélisation ont montré la capacité des modèles à reproduire les évolutions morphologiques et les flux transportés, avec des valeurs simulées comprises dans les plages d'incertitude de mesure. La partie amont de la retenue apparait ainsi nettement dominée par le transport de sable alors que la partie aval est dominée par le transport de fines. Finalement, les modèles ont été appliqués pour tester différents protocoles de gestion de la retenue dans le but d'établir des règles d'exploitation permettant de limiter le comblement de la retenue et les impacts environnementaux à l'échelle d'évènements de chasse et sur le long termeThis PhD thesis aimed to characterize the main processes responsible for the morphological evolution of an elongated reservoir, characterized by predominant longitudinal dimensions. It was based on the case study of the Genissiat reservoir, located in a series of hydropower plants on the French Upper Rhone River and regularly subjected to flushing operations. A fluvial geomorphological analysis based on morphological evolutions and hydraulic conditions was performed. A longitudinal delineation of the reservoir allowed to highlight the spatial dynamics of the reservoir. Sediment fluxes in the reservoir and their uncertainties were quantified and qualified and evidenced the contribution of transport processes associated to sand and fine sediments. Two one-dimensional numerical models were developed to simulate the main processes for fine sediment and coarse sediment transport, respectively. Numerical results showed that these models were able to reproduce morphological evolutions and sediment fluxes, with differences between simulated and measured values lower than the measurement uncertainties. It appeared that the upstream part of the reservoir is dominated by sand transport while the downstream part of the reservoir is dominant by silt and clay sediment transport. Finally, the models were used to simulate predictive scenarios and to evaluate the impact of the operating rules on sediment dynamics. Some enhancements to current operating rules were proposed to limit reservoir sedimentation and downstream ecological impacts related to flushing events and long-term management
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Kang, Sheen-Yeong, and 康新詠. "Study on Shihmen Reservoir Sediment Flushing Using 1D Explicit Finite Analytic Method." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/15734266434987824292.
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碩士國立交通大學
土木工程學系
99
The reservoirs in Taiwan have many problems related to sedimentation, so the sediment flushing during flood season to maintain the reservoir capacity is an important topic of water resources. Among the flushing strategies, venting density current is the most suitable one for Shihmen Reservoir. This study extends the previous research of Hsu (2008), which considered one-dimensional explicit finite analytic numerical model with cohesive sediment in reservoir, and applied the numerical model to the Shihmen Reservoir. According to previous studies, the larger capacity of the low-level outlet is, the better reservoir sediment flushing efficiency will be. The mass of flushing sediment of each outlet could be obtained by integrating the sediment concentration along water depth at the dam determined by the method of van Rijn (1984) and the outflow of each outlet determined by water stage-outflow rating curve. Therefore, the sediment flushing efficiency could be calculated by dividing the mass of flushing sediment to the mass of the upstream inflow sediment. By simulating the process of sediment flushing during Sinlaku typhoon in 2008 and Morakot typhoon in 2009, the flushing efficiencies of simulation results were compared by the observation data. And by simulating Aere typhoon in 2004, the flushing efficiencies of venting density current with different low-level outlet outflow capacities before and after the modification of the flushing facilities were also evaluated.
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HE, YU-SHENG, and 何聿聖. "Using Sediment Bypass Tunnel and Flushing Pool to Increase the Elimination amount of Reservoir Sludge – Case Study of Shihmen Reservoir." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/64get8.
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碩士國立臺灣大學
土木工程學研究所
107
Shihmen reservoir is a multi-objective reservoir with water supply、power generation、flood protection、irrigation and tourism. Due to extreme climate, the frequency of compound disasters in Shihmen Reservoir has increase in recent years. Among them, losing one-third storage capacity caused by reservoir sedimentation is more serious than others. As a result, the Shihmen Reservoir need to be operated to provide more than four times the current storage capacity per year to meet the water supply demand. The Northern Bureau of Water Resources Agency (Ministry of Economic Affairs) using diverse policy with hydraulic flushing and supplemented by mechanical dredging to extend life of reservoir, and the " Amuping sediment bypass Tunnel " will be completed in 2021, not only can improve flood control capacity, bit also can discharge 640000 sediment cubic meter per year to alleviate the siltation problem. Shihmen reservoir sedimentation problem can be divided into the check dam of the upstream catchment area, the middle and upper reaches of the reservoir area, and the siltation of the dam front and downstream sedimentation tanks, and the report of "Amuping upstream channel silt investigation" show that the sediments diameter is gradually being small from upstream to downstream, and according to the design unit of the Amping anti-sludge tunnel, the particle size is 0.1mm as the distinction between the valuable sediment and the priceless sediment, and the percent of valuable sediment also gradually being small from the upstream to the downstream of the river. Therefore, in this study takes the Amuping sediment bypass Tunnel project as the main axis, and divides the sedimentation problem into the upstream sediment transport problem ,and downstream elimination sludge problem to analyze and suggest. Two hydraulic dredgers will be set up after the Amuping sediment bypass Tunnel project completed, and drawout sediment will be sizing into valuable sand and priceless sand through facilities, in this study considers the physical factors affecting the operation of the concrete and operation costs, and in the rivers sections 29 and 31 can reach the maximum operating ratio of 4.5, furthermore the sensitivity analysis results have the greatest impact on the operating benefit ratio with the valuable sand price; the priceless sand is sieved and placed in the flushing pool. This study uses the SRH-2D numerical model to Simulate the situation of sediment be flushing, among, the sand transport parameters are estimated by the hydraulic model test results and the sensitivity analysis, and the boundary conditions is calculated by reservoir algorithm to simulate flushing sludge situation which be placed 7、16 and 37 days , the typhoon events in this study included typhoon Soudelor, Medem, Su Li and Sura, and all of case flushing sediment ratio up to 0.8. From the analysis results of this study, it is suggested that more than the income in the initial stage of operation can be used to invest in the dredging of the upstream catchment dam, and the scouring and flushing pool is mainly based on the silt of the sedimentation tank, so that the mechanical dredging can continue to dredge during the non-flood period. The Amping anti-silting tunnel project is used as a dredging hub in the middle of the reservoir area, and at the same time, the amount of soil sand removal in the Shimen Reservoir is increased to increase the utilization rate of the project.
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Kao, Lih-Shan, and 高力山. "Study on the Effects of Water Supply and Flushing Sediments through Reservoir Operational Rules." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/37739052577490165519.
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碩士國立臺灣大學
農業工程學系研究所
86
Recently, the development of water resource is an urgent task for the government due to the stong water demands in Taiwan. One of the effective methods to store surface water is to build a dam and form a reservoir. However, there will be many difficulties in building a dam such as lack of suitable dam sites, high cost of dam construction, related environmental impacts. On the other hand, reservoir sedimentation problems are serious in Taiwan because of the high sediment supply from its watershed. Therefore, to restore and sustain the useful lift of the reservoir is the most important issue for reservoir operation and management. To achieve the goal of preserving long-term reservoir capacity, the feasibility of flushing sediments through a reservoir will be investigated in this study. Based on the water supply and the water usage to flushing operations, the operational rules of reservoir is adjusted and evaluated. Genetic algorithms employed in operational simulation model is used to optimize the reservoir operational rules. The sediment flushing model is established to estimate outflow sediment discharge. The sediments flushing model consists of the water surface profile calculation and bed elevation calculation. Meanwhile, the outflow sediment discharge calculated is used to construct the updated line for the reservoir operators when flushing operations are performed. reservoir elevation-storage curve. The operational simulation model is then combined with the flushing sediment model for simulating operational rule curve which is optimized by the genetic algorithm. From the simulated results based on the shortage index (SI), it is found that the best flushing sediment timing is in May or in June every year. The operational rule obtained by the model can be a guideline for the reservoir operators when flushing operations are performed.
Book chapters on the topic "Reservoir sediment flushing"
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Sumi, Tetsuya, Sameh Kantoush, Taymaz Esmaeili, and Giyoung Ock. "Reservoir Sediment Flushing and Replenishment Below Dams." In Gravel-Bed Rivers, 385–414. Chichester, UK: John Wiley & Sons, Ltd, 2017. http://dx.doi.org/10.1002/9781118971437.ch14.
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Hidayat, Fahmi, Surya Budi Lesmana, and Ery Suhartanto. "Effect of Reservoir Sediment Flushing from Wlingi and Lodoyo Reservoirs on Downstream River Water Quality." In ICoSI 2014, 369–78. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-287-661-4_37.
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Fairbridge, Rhodes W., Lennart Jönsson, Lars Håkanson, W. Rodney White, Matjaz Mikos, Reginald W. Herschy, Felipe García-Rodríguez, et al. "Sediments, Flushing from Reservoirs." In Encyclopedia of Lakes and Reservoirs, 710–16. Dordrecht: Springer Netherlands, 2012. http://dx.doi.org/10.1007/978-1-4020-4410-6_159.
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"Modelling suspended sediment wave dynamics of reservoir flushing." In Reservoir Sedimentation, 175–86. CRC Press, 2014. http://dx.doi.org/10.1201/b17397-24.
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Espa, P., M. Brignoli, A. Previde Prato, E. Castelli, G. Crosa, G. Gentili, and F. Bondiolotti. "Controlled sediment flushing of Cancano reservoir." In Dams and Reservoirs under Changing Challenges, 395–402. CRC Press, 2011. http://dx.doi.org/10.1201/b11669-52.
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"Comprehensive numerical simulations of sediment transport and flushing of a Peruvian reservoir." In Reservoir Sedimentation, 223–32. CRC Press, 2014. http://dx.doi.org/10.1201/b17397-29.
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"Numerical analysis of sediment transport processes during a flushing event of an Alpine reservoir." In Reservoir Sedimentation, 167–74. CRC Press, 2014. http://dx.doi.org/10.1201/b17397-23.
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"Numerical modeling of suspended sediment transport during dam flushing: From reservoir dynamic to downstream propagation." In Reservoir Sedimentation, 187–96. CRC Press, 2014. http://dx.doi.org/10.1201/b17397-25.
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"Appendix 3. Flushing case studies." In Evacuation of sediments from reservoirs, 171–210. Thomas Telford Publishing, 2001. http://dx.doi.org/10.1680/eosfr.29538.bm05.
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"4. Worldwide experience of sediment flushing." In Evacuation of sediments from reservoirs, 63–89. Thomas Telford Publishing, 2001. http://dx.doi.org/10.1680/eosfr.29538.0004.
Full textConference papers on the topic "Reservoir sediment flushing"
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SAAM, LEON, KILIAN MOURIS, SILKE WIEPRECHT, and STEFAN HAUN. "THREE-DIMENSIONAL NUMERICAL MODELLING OF RESERVOIR FLUSHING TO OBTAIN LONG-TERM SEDIMENT EQUILIBRIUM." In 38th IAHR World Congress. The International Association for Hydro-Environment Engineering and Research (IAHR), 2019. http://dx.doi.org/10.3850/38wc092019-0742.
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TORRES, OSWALDO, PEDROD BARRERA, and MARCELOH GARCIA. "AN OPERATIONAL SEDIMENT FLUSHING SCHEME FOR THE OCAÑA HYDROPOWER PLANT REGULATION RESERVOIR IN ECUADOR." In 38th IAHR World Congress. The International Association for Hydro-Environment Engineering and Research (IAHR), 2019. http://dx.doi.org/10.3850/38wc092019-0847.
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Ghoreishi, S. H., H. Naji, M. R. M. Tabatabai, and G. Mompean. "Numerical Approach to Improve Flushing Efficiency by a Dynamic Morphological Model." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61281.
Full textAbstract:
The process of sediment flushing is simulated by a 3D numerical model in which sediment and flow interaction are reflected in the reservoirs. RANS equations are solved numerically by finite volume with a k-ε turbulence model. The convection-diffusion equation for the sediment concentration is solved. The Van-Rijn’s reference level concentration equation is adopted as a boundary condition. Bed changes are obtained by application of sediment continuity equation. The numerical results show that the flushing efficiency is related to the outflow discharge, initial conditions of water level and number and location of the bottom outlets.
Reports on the topic "Reservoir sediment flushing"
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Boyd, Paul M., and Stanford Gibson. Applying 1D Sediment Models to Reservoir Flushing Studies: Measuring, Monitoring, and Modeling the Spencer Dam Sediment Flush with HEC-RAS. Fort Belvoir, VA: Defense Technical Information Center, July 2016. http://dx.doi.org/10.21236/ad1012497.
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