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Добірка наукової літератури з теми "LOCAL SCOURING"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "LOCAL SCOURING"

ROY, CHANDAN. "Effect of Bridge Pier Geometry on Local Scouring." INTERNATIONAL JOURNAL OF EARTH SCIENCES AND ENGINEERING 10, no. 02 (April 26, 2017): 374–77. http://dx.doi.org/10.21276/ijee.2017.10.0234.

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Dargahi, Bijan. "Controlling Mechanism of Local Scouring." Journal of Hydraulic Engineering 116, no. 10 (October 1990): 1197–214. http://dx.doi.org/10.1061/(asce)0733-9429(1990)116:10(1197).

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Paramadita, Tifarah Dayansabila, Nadia Azarine, Aburizal Azhar, and Didit Puji Riyanto. "Local Scouring Visualization of Bed Channel Surface in Hydraulic Structure Using Surfer." Jurnal Teknik Sipil dan Perencanaan 24, no. 2 (October 31, 2022): 140–49. http://dx.doi.org/10.15294/jtsp.v24i2.36499.

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Abstract. Water flowing in the river causes a scouring event that occurs at the bed channel. The existence of scouring will increase along with changes in the geometry of the river and obstacles such as the weir which are followed by local scouring around the weir. Local scouring often occurs downstream end of weir sill which weakens its construction. Scouring measurement was conducted to monitor the pattern of scouring that occurs. By using Surfer software, the scouring visualization through the Data Grid and 3D Surface can be seen. In this research, scour monitoring in the laboratory using open channels (flume) and MDO weir with fine aggregate material as the basis of the channel. The retrieval of scouring data was performed after installing fine aggregate and three times variations of flow discharge, then the data were processed using Surfer. The first flow used water level +3.50 with the material carried at 3.77%. The second flow used water level +4.50 with the material carried at 11.16%. The third flow used water level +5.70 with the material carried at 25.46%. So with the continuous method, the total material carried at 36.27% is equivalent to 12575.77 cm3.

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Heleno Cardoso, António, Cristina Maria Sena Fael, and Rui Miguel Madeira Lança. "On Local Scouring at Single Piers." Scientific Research Communications 1, no. 1 (July 29, 2021): 1–16. http://dx.doi.org/10.52460/src.2021.006.

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The paper mostly summarizes disperse contributions of the authors published during the last fifteen years on the scour depth at single piers. These contributions rely on unique experiments in the sense that they are systematically longer than most of those found in the literature. The characterization of the effects of flow intensity, relative sand size, flow shallowness, time and pier shape and alignment is significantly improved as compared with existing literature. Our contributions consist on refinements of the model suggested by the school of Auckland, initiated by Raudkivi and boosted by Melville and his students. A considerable number of empirical equations and charts expresses those contributions.

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Dehghani, A. A., H. Md Azamathulla, S. A. Hashemi Najafi, and S. A. Ayyoubzadeh. "Local scouring around L-head groynes." Journal of Hydrology 504 (November 2013): 125–31. http://dx.doi.org/10.1016/j.jhydrol.2013.09.020.

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Sun, Dong Po, Li Sha Wang, and Peng Tao Wang. "Study on the Local Scouring of the Bridge with Sediment Control Dam." Applied Mechanics and Materials 204-208 (October 2012): 2230–35. http://dx.doi.org/10.4028/www.scientific.net/amm.204-208.2230.

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Based on the characteristics of local piers scouring after built the sediment control dam in the downstream of the bridge, by the monomer model experiment of flume, sixty groups of local piers scouring experiments have been carried on.The principle and the influence factors of the local piers scouring have been analyzed. The results of series model experiments show that, with the sediment control dams, the local scouring of the piers, on one hand, is influenced by the approach velocity, down-shearing vortex, dimension of the piers, diameter and gradation of the bed sand; on the other hand, it is affected by the elevation of the dam and distance between the pier and the dam. Therefore, the concept of “control slope” is introduced in order to reflect the impacts of the sediment control dam to the piers. Based on the theoretical deduction and dimensional analysis, the equation, which is used to calculate the local scouring with no-uniform bed sand, is acquired by multivariate regression analysis, has been testified by the flume experiment and has got a good result. The optimum value of control slope and the equation of local piers scouring with that dam provide valuable references for bridge flood-control design of the shallow foundation with downstream sediment control dam.

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Gao, Pengcheng, Xianyou Mou, and Honglan Ji. "Refined Simulation Study on the Effect of Scour Environments on Local Scour of Tandem Bridge Piers." Sustainability 15, no. 9 (April 25, 2023): 7171. http://dx.doi.org/10.3390/su15097171.

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Ice cover is a natural phenomenon unique to rivers in cold regions, and its existence is one of the reasons for the collapse of structural foundations of bridge piers across rivers. In order to understand the influence of different scouring environments on the hydrodynamics and sand bed morphology in the local scour holes around bridge pier foundations, this paper simulates the dynamic evolution process of the local scouring of tandem combination piers under open-flow and ice-cover environments, based on a turbulence model using the Reynolds-averaged Navier Stokes (RANS) method and a sediment transport model considering the slope collapse effect, respectively. This study also takes the vortex flow and shear stress distribution at different characteristic moments of the pier perimeter section as the penetration point to analyze the effect of the influence law of the scouring environment on the morphology and relative time scale of the scour hole, and makes a detailed comparison with the results of the indoor flume test. The results of this study show that: for local scouring in open-flow conditions, sediment initiation is doubly inhibited and the hydrodynamic forces in the scouring hole are weakened; the local scouring caused by ice cover contributes to the total scouring of the submerged pier within its coverage area, which significantly increases the depth and range of the local scouring hole; and, although the interaction of turbulent eddies and shear stress on the pier side is the main dynamic mechanism of the scouring generated around the pier, the two have a strong correlation. The results of this study, obtained by accurately quantifying the amount of eddies and shear stress around the pier, are the basis for the reasonable estimation of the maximum local scouring depth, which can provide a reference for the study of the evolution of the riverbed around submerged structures in cold areas and is essential to avoid structural damage to the piers and reduce the economic loss of traffic..

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Li, Qishun, Yanpeng Hao, Peng Zhang, Haotian Tan, Wanxing Tian, Linhao Chen, and Lin Yang. "Numerical Study of the Local Scouring Process and Influencing Factors of Semi-Exposed Submarine Cables." Journal of Marine Science and Engineering 11, no. 7 (July 1, 2023): 1349. http://dx.doi.org/10.3390/jmse11071349.

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Local scouring might result in the spanning of submarine cables, endangering their mechanical and electrical properties. In this contribution, a three-dimensional computational fluid dynamics simulation model is developed using FLOW-3D, and the scouring process of semi-exposed submarine cables is investigated. The effects of the sediment critical Shields number, sediment density, and ocean current velocity on local scouring are discussed, and variation rules for the submarine cables’ spanning time are provided. The results indicate that three scouring holes are formed around the submarine cables. The location of the bottom of the holes corresponds to that of the maximum shear velocity. The continuous development of scouring holes at the wake position leads to the spanning of the submarine cables. The increase in the sediment’s critical Shields number and sediment density, as well as the decrease in the ocean current velocity, will extend the time for maintaining the stability of the upstream scouring hole and retard the development velocity of the wake position and downstream scouring holes. The spanning time has a cubic relationship with the sediment’s critical Shields number, a linear relationship with the sediment density, and an exponential relationship with the ocean current velocity. In this paper, the local scouring process of semi-exposed submarine cables is studied, which provides a theoretical basis for the operation and maintenance of submarine cables.

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Qi, Hongliang, Weiping Tian, and Haochi Zhang. "Modeling Local Scour around a Cylindrical Pier with Circular Collar with Tilt Angles (Counterclockwise around the Direction of the Channel Cross-Section) in Clear-Water." Water 13, no. 22 (November 19, 2021): 3281. http://dx.doi.org/10.3390/w13223281.

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This research explores how a circular collar with a tilt angle (counterclockwise around the direction of the channel cross-section) could affect the local scour depth around a single cylindrical pier in clear-water based on Large Eddy Simulation (LES) in six cases. The results show that a horizontal circular collar is the best for reducing the local scour depth. With the increases of the tilt angle, the effect on reducing the local scour depth decreases gradually and is even counterproductive at the scour equilibrium. At the early stage of scouring, cases with circular collars show obvious scouring depth reductions. The smaller the tilt angle is, the better and longer-lasting the protection that the circular collar can provide. When the tilt angle is smaller than 5°, the location of the maximum local scouring is around 90–115° (the angle is measured clockwise from the flow direction) on both sides of the pier. When the tilt angle is greater than 5°, the depth of local scouring in the range around −115° to 115° is close to the maximum local scouring depth. Significantly larger areas reach the maximum scouring depth when the tilt angle increases. Compared to Case 1 (the pier without a circular collar), in the cases with a circular collar, the topographies downwards the pier in 1.0D (D is the diameter of the bridge pier) are changed to siltation from scouring. The topography downwards the pier changes from scouring to siltation with the increase of the tilt angle, and the shape of siltation changes from a long-narrow rectangle to an equilateral triangle. This study may provide valuable insights into the protection of the local scour of the pier.

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Kadono, Takuma, Shinichiro Okazaki, Yoshihiro Kabeyama, and Toshinori Matsui. "Effect of Angle between Pier and Center of River Flow on Local Scouring around the Bridge Pier." Water 12, no. 11 (November 15, 2020): 3192. http://dx.doi.org/10.3390/w12113192.

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In recent years, heavy rainfall disasters have caused frequent damage to bridge piers due to scouring and have resulted in the fall of bridges in many areas in Japan. The objective of this study was to investigate the effect of local scouring around the downstream of the piers on the local scouring around the center of the river flowing at an angle to the piers. It was found that when the center of the river flows at an angle to the piers, the scouring area becomes wider from the upstream to the downstream of the piers because of the longer inhibition width of the piers positioned perpendicular to the water flow. The downstream scouring depth tends to be smaller than the upstream scouring depth. In addition, the time to the onset of tilting deformation of the piers increases with the inhibition width of the piers positioned perpendicular to the flowing water.

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Дисертації з теми "LOCAL SCOURING"

Tregnaghi, Matteo. "Local scouring at bed sills under steady and unsteady conditions." Doctoral thesis, Università degli studi di Padova, 2008. http://hdl.handle.net/11577/3425036.

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Designers are often required to produce safe and economic structures in rivers with erodible beds, which may frequently induce scouring phenomena as they interfere with the natural stream. In CHAPTER 1, an extensive literature is illustrated on scouring by jets at high and low head structures, and predictive formulae are discussed that estimate the equilibrium scour depth of the scour hole, which are most obtained empirically from field and laboratory data. It is also discussed that different stages occur during local scour development. These stages basically include an initial rapid phase of severe scouring, followed by a stabilization phase approaching equilibrium conditions after a long time. CHAPTER 2 describes the theoretical basis to deal with long-term local scouring at bed sills under clear-water and steady-flow conditions. In gravel bed rivers, bed sills are used to limit bed degradation. Local scouring takes place downstream of each sill in addition to the general erosion pattern, and scour hole dimensions increase with the distance between sills. While overall aggradation can be estimated by using 1D morphological models, local scouring requires a more empirical approach. In fact most scouring phenomena are induced by turbulent jets that diffuse within the scour hole, by resulting in extremely complex flow fields. Many approaches are fully empirical, being based on curve fitting of experimental data that link scour depth to hydraulic quantities and sediment properties. In the most recent attempts, a semi-empirical approach has been followed, based on the identification of appropriate dimensionless groups using dimensional analysis before employing best-fitting procedures. The theoretical derivations proposed, which are based on the assumptions of the Buckingham's ?-theorem, are discussed by showing some further insights on the nature and role of the dimensionless parameters that ensued form dimensional analysis. CHAPTER 3 presents the results of experimental tests carried out by the author in 2003 about the pattern of local scouring generated at the toe of bed sills. The aim of this study is to evaluate the effect of upstream sediment supply on the scour depth and shape. The experiments simulated conditions of a steady upstream sediment supply which had the same grain size composition as the sediment deposit placed on the bed of the flume. The geometric characteristics of three scour holes developed under conditions of steady-flow discharge and steady upstream sediment supply were measured during 48 different tests. It is shown that the imposed sediment transport does not require the introduction of new dimensionless parameters into existing scour depth and length prediction formulae. The effects of sediment feed are shown to be incorporated in the existing dimensionless parameters. The new data set is used to re-calibrate existing scour depth formula. The influence of jet erosion on scour geometry is also discussed. Most research efforts have focused on predicting scour depth, which may affect the structure at the free overfall, as opposed to volumetric scour dimensions and sediment yield contribution due to local scour, which may affect downstream morphology and water quality as well as the structure but are much more difficult to measure in an actively eroding plunge pool. In CHAPTER 4, shape and volume of equilibrium local scour holes at bed sills in high-gradient streams are investigated by analyzing steady-flow scour profiles at the equilibrium stage. Geometric properties of the scour profile are analytically discussed and verified on the basis of new data from experimental tests described in CHAPTER 3 and data from literature. A model is presented to organize data analysis into a conceptual frame, which is based on the formal relationships for scour depth and length ensued from dimensional analysis, and on the assumption that scours exhibit definite geometric properties. Results show evidence of a universal geometric affinity of the scour. Geometric similarity is also found to occur, but only in a limited range of physical conditions. Prediction formulae are proposed which link the eroded volume to the geometric, hydraulic and sediment properties. Evidence on the scaling nature of the scour hole shapes have important implications on the prediction of the eroded volume. In turn, a correct evaluation of the eroded volume is necessary for the optimization of the design of the inter-sill distance. The temporal development of clear-water local scour depth at bed sills in uniform gravel beds is considered in CHAPTER 5. A new experimental program has been carried out by the author, which started at the end of 2006 and was concluded in March 2007 at the Fluid Dynamics Laboratory of The University of Auckland (NZ). Experiments are presented on the development of scour holes under unsteady hydraulic conditions, with the triangular-shaped hydrographs tested being of different durations and different rates of flow variation. Preliminary observations are discussed on the behavior of scour development, which is compared with the scour evolution for the steady-state case. Based on the experimental results and a theoretical framework, a method is given for the definition and prediction of the scouring process under unsteady flows in terms of a dimensionless temporal parameter. A "flash flood" is defined as an event for which the scour doesn't attain its potential magnitude, i.e. the equilibrium value for the peak hydrograph flow rate. It is shown that this flood nature is dependent on both the characteristics of the flood event itself and the characteristics of the stream. A quantitative measure of what constitutes a flash flood is given in terms of the identified temporal parameter, which represents one of the main goal of this study.

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Kouchakzadeh, Salah. "The local scouring phenomenon at bridge abutments terminating in the floodplain zone." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/9915.

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This study examines the local scouring phenomenon associated with bridge abutments exposed to combined main-channel (MC) and floodplain (FP) flows. The principal goal of the study was to develop and validate, based on a comprehensive physical-model testing programme that considered different abutment shapes, an improved relationship for predicting maximum scour depth. A relationship was established among sediment size, flow depth and longitudinal channel slope for initiating the threshold condition of bed material movement. This relationship facilitated the selection of sediment size and channel bed slope for the various experiments, which were performed in a compound channel under interacting (combined MC and FP flows) and non-interacting (isolated FP flow) conditions. Clear-water approach-flow conditions were utilized throughout the testing programme. A flow visualization technique was employed to study the various patterns of the combining flows in the MC/FP junction regions. It determined both the flow deflection angle and the extent of the influence zone (a portion of the channel width beyond the abutment) whose discharge, $Q\sb{w}$, contributes to the scour development. Maximum scour depths produced under interacting conditions were observed to be 15% to 30% greater than those observed for non-interacting conditions. This important observation clearly demonstrated the need to properly account for compound-channel effects in the simulation exercise. The scour prediction relationship presented herein is based on a dimensional analysis of the relevant parameters and incorporates the data obtained from the laboratory studies performed in a compound channel using vertical-wall, wing-wall, semi-circular, and spill-through abutment shapes. The model indicates a very good agreement between predicted and observed maximum scour depths for bridge abutments terminating in the FP zone.

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Lyons, Simone. "An investigation into the initiation of local scouring around rectangular """"long"""" contractions." Master's thesis, University of Cape Town, 2003. http://hdl.handle.net/11427/5029.

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Rahman, Md Munsur. "STUDIES ON DEFORMATION PROCESS OF MEANDERING CHANNELS AND LOCAL SCOURING AROUND SPUR-DIKE-LIKE STRUCTURES." Kyoto University, 1999. http://hdl.handle.net/2433/181778.

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Shih-Hsien, Peng, and 彭思顯. "The Local Scouring Phenomenon of Free Overfall Flow." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/37939767681426637470.

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CHAUHAN, KAUSTUBH. "CFD STUDIES OF LOCAL SCOURING AROUND BRIDGE PIER." Thesis, 2019. http://dspace.dtu.ac.in:8080/jspui/handle/repository/16836.

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The threat of local scour around bridge piers has been in research for many years. According to the various studies, local scour around the bridge pier is the prime cause for most of the bridge failures. The main objective of the present study was to investigate the flow behavior and the scour phenomenon around the bridge piers of various shapes namely Circular, Elliptical, Square and Streamlined. Local scouring depends on various factors like depth of flow, upstream flow conditions, pier shape and dimensions. Here, we have taken only pier shape as the primary factor and kept other factors constant. The numerical simulations were even carried out using CFD- Fluent, eulerian, k–epsilon turbulence model, to elaborate the physics behind the scour formation. CFD simulation tool can be used for wide understanding of the flow behavior around the bridge piers even without physical model studies because it saves time and money as compared to experimental studies. Three dimensional simulation of flow behavior around four pier shapes indicates that the streamlined pier is the most efficient pier to use as it allows the flow to pass smoothly around it creating less obstruction to the flow and hence creating less chances of local scouring near the pier toe.

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Fan, Wen-Kang, and 范文綱. "A local Scouring Monitoring and Safety Warning System of Bridge." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/e8exwg.

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碩士
國立中央大學
土木工程研究所
97
Scour is always the primary threat to bridges in Taiwan area. Since bridges will experience floods which may cause damage from scour holes forming around bridge piers and abutments. As scour changes the geometry of the bridge pier embedded in the soil foundation, the effects due to other loads, such as live load, wind load, debris collision, etc., are amplified. In this condition, bridge may have settlement or tipping even collapse. Therefore it is demanded by the bridge authority agencies to have a monitor sensor to determine the real-time scour depth. Besides, with internet it is easily to handle the real-time information at bridge site to alarm the siren in time from control center through the predefined safety warning algorithm. A piezoelectric fluoropolymer film type real-time scouring monitoring sensor installed along the bridge pier is presented. The core idea of developing this scouring sensing system is based on the physical character that output voltage can be generated as the piezoelectric thin film is deformed by the flowing media. Therefore, a sensing device can be manufactured by mounting piezoelectric thin films along the rod with a fixed distance and insert it into a borehole beside the bridge pier. The piezoelectric film embedded in the soil of riverbed is undeformed and the output voltage is much smaller than the one disturbed by the water current. From the output signals of all the piezoelectric sensors with known locations along the depth of the pier foundation, one can trace the variation of the soil/water interface before, during and after a flood. Compared with other types of scouring sensors, this piezoelectric type scouring sensor is working without power, durable, sensitive, real-time and cost effective. In this paper, the basis theory and the performance that in laboratory of this novel piezoelectric film type scouring device are introduced. The installation of the system in field is also addressed. In this study, it also brings up three methods for readers to analyze the safety of bridge, which can be taken into consideration of blocking a bridge.

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Chiu, Ming-Hung, and 邱銘鴻. "Experimental Study on Panel Effect to Sand Motion and Local Scouring." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/51415229301365868283.

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碩士
國立成功大學
水利及海洋工程學系
86
The aim of this experiment studies is undertaken to know the directions of sand motion and the positions of local scouring due to the effect of differentflow-training panels. It is known by experiments that the sand motion is caused by helix in a clockwise direction of the angle of attack is smallerthan -π/2, no matter how large the opening of the surface panel. The bottompanels have a critical height is about 0.5 times local water depth at designstage. In other words, the panel''s height is above or under the critical depthof bottom panels, while the sand-training is quite different. The middlepanels, not close to the surface and the bottom, only in the case the panel''s bottom is close to the river bed have the nearby phenomenon of depositing and scouring with the bottom panels. In the same angle of attack with flow, the bottom panels with the height greater than half local water depth at design stage have the same phenomenon of depositing and scouring with the surface panels. The open space under the surface panel allows the flow passing, then the local scour will take place at downstream, but the bottom panel has the local scour at upstream nearby.

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Fang, Yu-Yun, and 方于芸. "Study on Scouring Rate of Local Scour by Sloping Drop Structure." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/j84t6k.

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碩士
國立中興大學
土木工程學系所
105
For river management and water acquirement, drop structures are commonly set up in the river course. Although the stream channels can be stabilized, the gravel will not move downwards and its deposition near the drop structures increases the slope of upstream channel, consequently leads to a steep slope and induces fast flow. As a result, the large impact forces destroy the downstream protection work of drop structures. This study aims at the scouring rate of local scour and relevant scouring behavior by sloping drop structure. From the analyzed results, it indicates that (1). The maximum stable scouring depth Yse is proportional to the drop number D, but it is inversely proportional to the dimensionless diameter of bed material G and the bed slope of upstream channel S. The distance from toe to the maximum stable scouring depth Lse and the maximum scour length Lei are proportional to both D and S, but they are inversely proportional to G. The maximum scouring volume per unit width of flow quantity is proportional to the dimensionless impact force F ̅d, but it is inversely proportional to the G and S; (2). The characteristic time te to reach the stability of scour increases with the increase of D and decrease of G, but it is almost indifference to S; (3). The maximum time-dependent scouring depth Yst , scouring distance Lst, scouring length Lit and scouring volume per unit width of flow quantity Ast is proportional to time in an exponential manner, but it is inversely proportional to the G and S; (4). The bed scour is caused by drop nape in a great scouring rate. The souring pit is almost completed in a quarter time of te and the scour will be developed completely when the characteristic time te is arrived.

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Jan, Yuan-Haur, and 詹元豪. "Local Scouring to Single Pile and Pile Groups of Bridge Pier." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/79241168101427856530.

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Частини книг з теми "LOCAL SCOURING"

Kiraga, Marta, and Zbigniew Popek. "Geometry Description of Local Scouring Process in Various Laboratory Water Structure Models." In GeoPlanet: Earth and Planetary Sciences, 245–58. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70914-7_15.

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Devi, Geeta, and Munendra Kumar. "Countermeasures Against Local Scouring at Circular Bridge Piers Using Collar and Combination of Slot and Collar." In River Hydraulics, 289–96. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-81768-8_24.

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Calomino, F., C. Grimaldi, A. Cardoso, and R. Gaudio. "Local scouring at bridge piers and abutments." In River Flow 2006. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781439833865.ch178.

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Comiti, F., A. Andreoli, and M. Lenzi. "Influence of local scouring on natural step pool geometry." In River Flow 2004, 173–79. CRC Press, 2004. http://dx.doi.org/10.1201/b16998-23.

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Schanderl, W., M. Manhart, and O. Link. "Discussion of the impact of pressure fluctuations on local scouring." In River Sedimentation, 394–401. CRC Press, 2016. http://dx.doi.org/10.1201/9781315623207-75.

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Jin, Haisheng. "3D numerical analysis of local flow and scouring around cylindrical piles." In Environmental Hydraulics and Sustainable Water Management, Two Volume Set, 1819–25. CRC Press, 2004. http://dx.doi.org/10.1201/b16814-298.

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Mioduszewski, T., S. Maeno, and Y. Uema. "Influence of the spur dike permeability on local velocities and scouring." In Environmental Hydraulics and Sustainable Water Management, Two Volume Set, 1843–49. CRC Press, 2004. http://dx.doi.org/10.1201/b16814-301.

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Guandalini, R., G. Agate, S. Manenti, S. Sibilla, and M. Gallati. "Innovative numerical modeling to investigate local scouring problems induced by fluvial structures." In Bridge Maintenance, Safety, Management, Resilience and Sustainability, 3110–16. CRC Press, 2012. http://dx.doi.org/10.1201/b12352-470.

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Harada, E., T. Hoaoda, H. Gotoh, and K. Obayashi. "Numerical simulation of local scouring process by solid–liquid two-phase flow model." In Environmental Hydraulics and Sustainable Water Management, Two Volume Set, 1851–57. CRC Press, 2004. http://dx.doi.org/10.1201/b16814-302.

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Comiti, F., M. Tregnaghi, and A. Marion. "Sediment supply effect on local scouring at bed sills in high gradient streams." In River Flow 2006. Taylor & Francis, 2006. http://dx.doi.org/10.1201/9781439833865.ch191.

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Тези доповідей конференцій з теми "LOCAL SCOURING"

Karami, H., A. Ardeshir, M. Saneie, K. Behzadian, and F. Jalilsani. "Reduction of Local Scouring with Protective Spur Dike." In World Environmental and Water Resources Congress 2008. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/40976(316)255.

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GUO, JIAN, JIYI WU, and JINQUAN WANG. "Study on Local Scouring Monitoring of Hangzhou Bay Bridge." In Structural Health Monitoring 2019. Lancaster, PA: DEStech Publications, Inc., 2019. http://dx.doi.org/10.12783/shm2019/32453.

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Pourahmadi, Masoumeh, and Habib Hakimzadeh. "Experimental Investigation of Local Scour Around Conical Pier." In ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49474.

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There are many reports about failure of bridges around the world due to scouring. This shows the importance of research on scouring and any possibility on scour protection. The method used of control of scouring around the bridge piers can be divided in two categories, namely: Direct and Indirect methods. The first method may be done by increasing the streambed resistance. This is usually done by riprap around piers. Indirect control, however, can be achieved by changing the flow pattern around a pier. The second method can be done for instance by using a collar around the pier or using a slot within the pier. Another method of the second category is to use variable section in depth. For this purpose, various slopes of conical piers are investigated in this research study. Experiments were carried out in a channel with 10 meters long, 0.3 meter wide and 0.5 meter depth, having a horizontal slope. Median size of sediment was 0.78 mm with geometric standard deviation of 1.24. The experimental results have been shown that the scour depth at conical piers decrease in compare with cylindrical ones. These observations, may partly be due to decrease in bed shear stress, which is a key parameter for the sediment transport. Therefore, from experimental data it was found that with a very mild slope on conical pier, the scour depth decreased about 15.8% when compared with the cylindrical one. For the other piers with larger slope and larger diameter on the bed, the wall side effects were appeared, however the reduction rate of scour depth was not as much as expected, compared with the first conical pier.

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Nakamura, Tomoaki, Solomon C. Yim, and Norimi Mizutani. "NUMERICAL SIMULATION ON LOCAL SCOURING AROUND BOTTOM-MOUNTED MOVABLE SHORT CYLINDER." In Proceedings of the 6th International Conference. WORLD SCIENTIFIC, 2013. http://dx.doi.org/10.1142/9789814412216_0082.

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Fathpour, Navid, and Aronne Armanini. "Influence of semi-circle patches of vegetation on flow and local scouring." In The International Conference On Fluvial Hydraulics (River Flow 2016). Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315644479-349.

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NING, Jian, Guo-Dong LI, and Shan-Shan LI. "Experimental Study on the Influence of Spur Dikes Spacing on Local Scouring." In 2018 International Conference on Energy Development and Environmental Protection (EDEP 2018). Paris, France: Atlantis Press, 2018. http://dx.doi.org/10.2991/edep-18.2018.47.

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Hwang, Jeongwoo, Ja-Hoon Lee, and Yong-Sik Cho. "Numerical Prediction of Scouring Depth Around Foundations of Offshore Structures." In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41474.

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The pile foundations of offshore structures are vulnerable to local ground loss by scouring. The vortex flow affected by the flow conditions, ground conditions, and the shape of the pile is the main cause of scouring. The decrease of an embedded depth of foundation pile by scouring may lead to an excessive displacement of the structure and a decrease of the bearing power, leading to a collapse of the offshore structure. In this work, a three-dimensional commercial code named STAR-CCM+ has been employed to predict the final depth of the scouring-hole around the foundation of offshore structures. Assuming the bed as a fluid having a high level of dynamic viscosity and density, the prediction has been accomplished by using the multi-phase flow model. The model solves the Reynolds Averaged Navier-Stokes (RANS) equations, and standard k-ε turbulence model to estimate the depth of the scouring-hole. To guarantee the reliability of the model, the results of the numerical model have been compared with available laboratory measurements. A reasonable agreement has been observed.

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Bakhtiary, Abbas Yeganeh, Mir Emad Mousavi, and Amin Tohidi Vahdat. "Time Scale of Scouring Around Submarine Pipelines Induced by Wave and Current." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92381.

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Physical experiments have been conducted to explore the time scale of the wave- and current- induced local scouring around submarine pipelines as well as the development of the scour profile versus the elapsing time. The experimental results have been used to examine the recommended equations of Fredsoe et al. (1992) and/or to derive new equations for prediction of scour depth/width during the process with respect to the equilibrium scour properties. In addition, the total duration (time scale) of scouring is studied and a new equation is proposed for the case of current motion. The results of this equation are then simplified in the form of diagrams for estimation of the scouring duration in practice.

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Mousavi, Mir Emad, Abbas Yeganeh Bakhtiary, and Nastaran Enshaei. "Equilibrium Profile of Current-Induced Scour Around Submarine Pipelines." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92383.

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Submarine pipelines installed on seabed disturb the local flow field and bring imbalance in local sediment transport that leads to scouring. Local scouring can leave the pipeline unsupported in significant distances. The free spans of the pipeline are susceptible to damages arising from environmental forces or human activities. This paper presents results of experimental investigations on the equilibrium profile of the local scouring around the pipe due to unidirectional current. New equations are proposed for the prediction of the scour depth and width before installation of the pipe. It is evident from the experimental results that the equilibrium depth of the current-induced scour is a function of pipe diameter and Shields number. Also scour width at upstream and downstream of the pipe and the total width of the scour are investigated. The results are simplified in the form of diagrams for prediction of the scour depth/width in practice based on flow velocity, bed roughness condition and size of the granular materials. The results can be used either for the design purposes or for the calibration of numerical models. One of the results of this work is that the scour width at downstream of the pipe is about 2.5 times of the width at upstream.

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Fleit, Gábor, Sándor Baranya, and Hans Bihs. "Cfd Modeling Of Flow And Local Scouring In The Vicinity Of Submerged Bridges." In Proceedings of the 39th IAHR World Congress From Snow to Sea. Spain: International Association for Hydro-Environment Engineering and Research (IAHR), 2022. http://dx.doi.org/10.3850/iahr-39wc252171192022851.

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Звіти організацій з теми "LOCAL SCOURING"

Kwun, H. L51694 Investigation of Techniques for Bulk Stress Measurement on Exposed Pipelines-Phases I and II. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), October 1993. http://dx.doi.org/10.55274/r0010318.

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Differential movement of a buried pipeline resulting from terrain instabilities such as subsidence, fault slippage, frost heave, ice scouring, soil movement, and landslide can create localized areas of high stress in a pipeline. These areas may be susceptible to mechanical failure and therefore may compromise the structural integrity of the line. Nondestructive testing (NDT) methods that can detect high-stress regions and measure the magnitude of the stress in the pipeline are needed to determine if or when remedial action must be taken to prevent stress-related damage. The areas of high stress can compromise the integrity of the pipeline, despite the fact that the highly stressed areas may not be readily detectable. �This report describes two phases of development for a nonintrusive technique to quantify the local, throughwall average axial stress in an exposed pipe. The technique selected for evaluation and development is a low-frequency, electromagnetic technique, called multiparameter magnetic measurement (MPMM). MPMM is a combination of existing magnetic techniques including magnetic hysteresis measurement, nonlinear harmonic analysis, and multiparameter correlation. The work included both a proof-of-principle demonstration of the technique using samples of grade X-42, X-46, and X-52 pipe (Phase I), and further determination of practical applicability of the MPMM technique (Phase II). Phase II focused on evaluating the variability of magnetic response to stress among five samples of grade X-42 pipe.

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Hodul, M., H. P. White, and A. Knudby. A report on water quality monitoring in Quesnel Lake, British Columbia, subsequent to the Mount Polley tailings dam spill, using optical satellite imagery. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330556.

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In the early morning on the 4th of August 2014, a tailings dam near Quesnel, BC burst, spilling approximately 25 million m3 of runoff containing heavy metal elements into nearby Quesnel Lake (Byrne et al. 2018). The runoff slurry, which included lead, arsenic, selenium, and vanadium spilled through Hazeltine Creek, scouring its banks and picking up till and forest cover on the way, and ultimately ended up in Quesnel Lake, whose water level rose by 1.5 m as a result. While the introduction of heavy metals into Quesnel Lake was of environmental concern, the additional till and forest cover scoured from the banks of Hazeltine Creek added to the lake has also been of concern to salmon spawning grounds. Immediate repercussions of the spill involved the damage of sensitive environments along the banks and on the lake bed, the closing of the seasonal salmon fishery in the lake, and a change in the microbial composition of the lake bed (Hatam et al. 2019). In addition, there appears to be a seasonal resuspension of the tailings sediment due to thermal cycling of the water and surface winds (Hamilton et al. 2020). While the water quality of Quesnel Lake continues to be monitored for the tailings sediments, primarily by members at the Quesnel River Research Centre, the sample-and-test methods of water quality testing used, while highly accurate, are expensive to undertake, and not spatially exhaustive. The use of remote sensing techniques, though not as accurate as lab testing, allows for the relatively fast creation of expansive water quality maps using sensors mounted on boats, planes, and satellites (Ritchie et al. 2003). The most common method for the remote sensing of surface water quality is through the use of a physics-based semianalytical model which simulates light passing through a water column with a given set of Inherent Optical Properties (IOPs), developed by Lee et al. (1998) and commonly referred to as a Radiative Transfer Model (RTM). The RTM forward-models a wide range of water-leaving spectral signatures based on IOPs determined by a mix of water constituents, including natural materials and pollutants. Remote sensing imagery is then used to invert the model by finding the modelled water spectrum which most closely resembles that seen in the imagery (Brando et al 2009). This project set out to develop an RTM water quality model to monitor the water quality in Quesnel Lake, allowing for the entire surface of the lake to be mapped at once, in an effort to easily determine the timing and extent of resuspension events, as well as potentially investigate greening events reported by locals. The project intended to use a combination of multispectral imagery (Landsat-8 and Sentinel-2), as well as hyperspectral imagery (DESIS), combined with field calibration/validation of the resulting models. The project began in the Autumn before the COVID pandemic, with plans to undertake a comprehensive fieldwork campaign to gather model calibration data in the summer of 2020. Since a province-wide travel shutdown and social distancing procedures made it difficult to carry out water quality surveying in a small boat, an insufficient amount of fieldwork was conducted to suit the needs of the project. Thus, the project has been put on hold, and the primary researcher has moved to a different project. This document stands as a report on all of the work conducted up to April 2021, intended largely as an instructional document for researchers who may wish to continue the work once fieldwork may freely and safely resume. This research was undertaken at the University of Ottawa, with supporting funding provided by the Earth Observations for Cumulative Effects (EO4CE) Program Work Package 10b: Site Monitoring and Remediation, Canada Centre for Remote Sensing, through the Natural Resources Canada Research Affiliate Program (RAP).

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