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Rozprawy doktorskie na temat „LOCAL SCAUR”

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Data publikacji: 11 września 2023

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1

Hong, SeungHo. "Interaction of Bridge Contraction Scour and Pier Scour in a Laboratory River Model." Thesis, Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/7533.

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The engineering design of a hydraulic structure such as a river bridge requires consideration of the factors that affect the safety of the structure. Among them, one of the most important variables is bridge foundation scour. However, engineering experience seems to indicate that computation of scour depth using current scour formulas tends to overpredict scour in comparison to field measurements. The result can be an overdesigned bridge foundation that increases the cost of the bridge. One possible reason for the overprediction is the current practice of adding separate estimates of contract
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Lavictoire, Alexandra. "Bore-Induced Local Scour around a Circular Structure." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/31950.

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Recent natural disasters, such as major tsunamis, have prompted researchers and practicing engineers to improve their understanding of the impacts of bore-like waves on structures and their foundations. The high velocity and the relatively short duration of hydraulic bores causes local scouring which is different from that generated by river flows and waves. The present study uses an experimental model to simulate the propagation of a hydraulic bore over a movable sediment bed placed around a circular pier-like structure. Measurements of water surface elevation, bore propagation velocity an
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3

Li, Junhong Li. "Pier Streamlining as a Bridge Local Scour Countermeasure and the Underlying Scour Mechanism." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1518565785864439.

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Kabir, Alamgir. "Modelling local scour around bridge piers using TELEMAC." Thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/6683.

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Scour at bridge crossings is a major cause of bridge failure. There are several different types of scour such as general scour, constriction scour and local scour. One of the most serious types is local scour which occurs as a result of vortex formation around bridge piers and abutments (Hoffmans & Verheij, 1997; Raudkivi, 1998; Melville & Coleman, 2000; Richardson & Davis, 2001; Armitage & McGahey, 2003). Local scour is also one of the most difficult to predict accurately. If not adequately designed for, local scour of a riverbed at a bridge pier may become deep enough to undermine the pier f
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Ozalp, Murat Can. "Experimental Investigation Of Local Scour Around Bridge Pier Groups." Master's thesis, METU, 2013. http://etd.lib.metu.edu.tr/upload/12615594/index.pdf.

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It is an important task that design engineers in practice predict the local scour around bridge piers as accurately as possible because excessive local scour around bridge piers unbalance and demolish the bridges. Many equations have been proposed previously by various researchers, based on their experimental findings, but no general method has been developed so far due to the complexity of the topic. In the present study two new bridge pier groups were employed to investigate the inclination effect of the most upstream and downstream piers on the local scours around all piers. Total of 72 exp
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6

Lee, Seung Oh. "Physical modeling of local scour around complex bridge piers." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/29398.

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Thesis (Ph.D)--Civil and Environmental Engineering, Georgia Institute of Technology, 2006.<br>Committe Chair: Terry W. Sturm; Committe Members: Dr. Fotis Sotiropoulos; Committee Members: Dr. Philip J. Roberts; Committee Members: Dr. Donald R. Webster; Committee Members: Dr. Anthony Hayter. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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7

Daskin, Sueyla. "Effects Of Collars On Local Scour Around Semi-circularend Bridge Abutments." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613310/index.pdf.

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During severe floods, bed material around bridge piers and abutments are scoured by the flow and as a result, bridges are subject to damages. These damages are mostly unrepairable and can result in loss of lives and property. In this thesis study, abutment scour under clear-water condition was investigated and collars were tested as scour countermeasures around the abutments. The experimental study was carried out in a rectangular channel with an almost uniform cohesionless bed material of d50=1.50 mm for a test period of 3-hours. The channel was 28.5 m long and 1.5 m wide. The erodible bed ma
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8

Cesme, Murat. "Experimental Investigation Of Local Scour Around Inclined Dual Bridge Piers." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/2/12606597/index.pdf.

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For a bridge engineer, it is very important to estimate the maximum scour depth around the piers as accurately as possible, in order to design the footing safely. Many experimental studies have been performed by several investigators until now, in order to obtain information about scouring mechanism. The aim of this experimental study is to examine the effect of inclination of the dual bridge piers on scour depth. The experiments have been conducted with dual pier models under clear-water conditions, for various uniform flow depths. Scour depths had been measured at four different points arou
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9

Ghoma, Mohamed Ibrahem. "The effect of wall jet flow on local scour hole." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5501.

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This thesis reports on investigations carried out to study of the effect of horizontal wall jets on rough, fixed and mobile beds in open channel flow. Experimental tests were carried out, using fixed and mobile sediment beds. Computer simulation models for the flow within the jet and resulting sediment transport were developed and their results analysed in this study. In the experimental phase, tests were carried out with both fixed and mobile sediment beds. The shape of the water surface, numerous point velocity measurements and measurements of the evolving scour hole shape were made. Detaile
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10

Cunninghame, Margaret. "Numerical modelling of local scour in rivers using fluent 6.2." Master's thesis, University of Cape Town, 2005. http://hdl.handle.net/11427/5057.

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Includes bibliographical references.<br>Scour and deposition are natural processes which take place in a river as the stream profile adjusts to changing flow rates, sediment loads and other environmental conditions. Man-made obstacles to the stream flow such as bridge piers and abutments and other hydraulic structures alter flow patterns causing local scouring and deposition. Excessive scour undermines the foundations of bridges and other fluvial structures which may ultimately cause their collapse. Reliable methods are needed to model the complex flow features at bridge piers and abutments an
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11

Walker, Wayne O. "Field measurements of local pier scour in a tidal inlet." Thesis, (10.49 MB), 1995. http://handle.dtic.mil/100.2/ADA303503.

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Thesis (M.S. in Civil Engineering)--University of Florida, December 1995.<br>"December 1995." Description based on title screen as viewed on February 8, 2010. DTIC Identifier(s): Scouring, Wind Waves, Sieve Analysis, Seiching. Includes bibliographical references (p. 139). Also available in print.
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12

Smyre, Elizabeth Anne. "Effect of suspended fine sediment on equilibrium local scour depths." [Gainesville, Fla.] : University of Florida, 2002. http://purl.fcla.edu/fcla/etd/UFE0000612.

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13

Ghoma, Mohamed I. "The Effect of Wall Jet Flow on Local Scour Hole." Thesis, University of Bradford, 2011. http://hdl.handle.net/10454/5501.

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This thesis reports on investigations carried out to study of the effect of horizontal wall jets on rough, fixed and mobile beds in open channel flow. Experimental tests were carried out, using fixed and mobile sediment beds. Computer simulation models for the flow within the jet and resulting sediment transport were developed and their results analysed in this study. In the experimental phase, tests were carried out with both fixed and mobile sediment beds. The shape of the water surface, numerous point velocity measurements and measurements of the evolving scour hole shape were made. Detail
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14

Nazariha, Mehrdad. "Design relationships for maximum local scour depth for bridge pier groups." Thesis, University of Ottawa (Canada), 1996. http://hdl.handle.net/10393/9989.

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An investigation of local scour at pier groups has been conducted with the aim of developing design recommendations and scour depth prediction equations for the bridge pier groups. A comprehensive series of steady uniform flow experiments was performed on groups of 2, 3, 4, and 6 model piers. All tests were conducted under clear-water scour conditions. Parameters governing local scour depth around bridge piers include: flow characteristics, sediment properties, and pier size and shape. The effects of these parameters on the maximum local scour depth for a single pier (D$\sb{\rm s}$), have been
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15

Bennetts, Tony Andrew. "Local scour around bridge piers under steady and unsteady flow conditions." Thesis, University of Hertfordshire, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.394076.

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16

Armitage, Neil Philip. "A unit stream power model for the prediction of local scour." Thesis, Stellenbosch : Stellenbosch University, 2002. http://hdl.handle.net/10019.1/52716.

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Thesis (PhD)--Stellenbosch University, 2002.<br>ENGLISH ABSTRACT: Local scour is the erosion of a riverbed resulting from the flow of the river around an obstacle. It is a principal cause of failure of bridges and other hydraulic structures. Current design practice relies on the use of empirical formulae that are often extremely inaccurate, or on the use of physical models that are very expensive. Recent advances in the power of microcomputers have however made numerical simulation increasingly attractive. One obstacle to numerical simulation though is that there is no general agreement
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17

Tekin, Fatime. "Local Scour Characteristics Around Semi-circular End Bridge Abutments With And Without Collars." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614405/index.pdf.

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The major damage to bridges occurs due to scour of the bed materials around piers and abutments during severe floods. This study involves the experimental investigations of the various scour patterns forming around abutment models tested with and without collars as scour countermeasures. The experiments were conducted in a rectangular channel under clear-water scour conditions. In the first part of this study, 34 experiments were conducted with semi-circular end abutment models with and without a collar for a period of 3 hours. Collars of various sizes were placed at different elevations on t
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18

Abban, Benjamin. "Using the movability number to model local clear-water scour in rivers." Master's thesis, University of Cape Town, 2007. http://hdl.handle.net/11427/7459.

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Includes bibliographical references.<br>Local scour is associated with a considerable number of bridge failures worldwide. It occurs at bridge piers and abutments as a result of interactions between complex flow features and the channel bed. The number of factors involved in the interactions makes it difficult to predict. A lot of research has therefore been performed by several investigators to gain insight into the scouring process and scour prediction. Currently, local scour is estimated using physical models, empirical formulae or numerical models. Of these methods, the use of numerical mo
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19

Kho, Kai Tze. "An experimental study of local scour around circular bridge piers in cohesive soils." Thesis, University of Newcastle Upon Tyne, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.407586.

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20

Zhou, Lu. "Numerical modelling of scour in steady flows." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEC015/document.

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Cette thèse porte sur le développement d’un modèle numérique de l’affouillement causée par des obstacles montes sur le lit, combinant les processus hydrodynamiques et morphologiques. Le modèle numérique est basé sur le solveur de champ d’écoulement polyphasique de l’outil CFD open-source OpenFOAMR qui est distribue par OpenCFD Ltd. Le module hydrodynamique du modèle résout les équations de Navier-Stokes avec moyennes de Reynolds (RANS) et les modèles des turbulences k-ε ou k-ω. Il existe deux interfaces dans le domaine de simulation: la surface libre entre l’eau et l’air, qui est suivi par la
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21

Apaydin, Meric. "A Study On Risk Assessment Of Scour Vulnerable Bridges." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612427/index.pdf.

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Many river bridges fail or are seriously damaged due to excessive local scouring around piers and abutments. To protect a bridge from scour-induced failure, it should be designed properly against excessive scouring and its scour criticality should be checked regularly throughout the service life to take prompt action. The Federal Highway Administration of United States (FHWA) developed a program, HYRISK, as a basis for evaluation of existing scour failure risk of a bridge. It provides implementation of a risk-based model, which is used to calculate the annual risk of scour failure of a bridge
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22

Abida, Habib. "A laboratory investigation of local scour downstream of box culvert outlets and an alternative measure for its control." Thesis, University of Ottawa (Canada), 1988. http://hdl.handle.net/10393/5251.

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23

Suehiro, Atsushi. "Treatment of Acute Vocal Fold Scar with Local Injection of Basic Fibroblast Growth Factor: A Canine Study." Kyoto University, 2010. http://hdl.handle.net/2433/120922.

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24

McConnell, George Charles. "Chronic inflammation surrounding intra-cortical electrodes is correlated with a local, neurodegenerative state." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/26615.

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Thesis (Ph.D)--Biomedical Engineering, Georgia Institute of Technology, 2009.<br>Committee Chair: Bellamkonda, Ravi; Committee Member: Babensee, Julia; Committee Member: Butera, Robert; Committee Member: DeWeerth, Steve; Committee Member: Lee, Robert; Committee Member: McKeon, Robert. Part of the SMARTech Electronic Thesis and Dissertation Collection.
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25

Rodríguez, Pérez Rubén Darío Jesús, and Manrique Geraldine Zuley Yataco. "Comparación de los modelos numéricos 1D y 2D en el análisis de socavación total en el puente Huallaga." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/654632.

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La socavación en las bases de los puentes es una de las principales causas de fallas de estas infraestructuras en el mundo, lo que conlleva a elevados gastos en reparación, aislamiento de poblaciones y pérdidas de vidas humanas. El presente trabajo de investigación tiene como principal objetivo calcular, analizar y comparar la socavación total que se produce en los pilares y estribos del puente Huallaga mediante un modelo unidimensional y un modelo bidimensional. Para lograr este objetivo se recopilaron las diferentes metodologías de cálculo de socavación y se escogieron las óptimas para el pr
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26

Acharya, Anu. "EXPERIMENTAL STUDY AND NUMERICAL SIMULATION OF FLOW AND SEDIMENT TRANSPORT AROUND A SERIES OF SPUR DIKES." Diss., The University of Arizona, 2011. http://hdl.handle.net/10150/145391.

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The intensive research on sediment transport indicates a need of an appropriate equation for predicting the total sediment load in rivers to manage reservoirs, operate dam and design in-stream hydraulic structures. None of the available equations in sediment transport has gained universal acceptance for predicting the total sediment transport rate. These facts indicate the need of a general formula to represent all these formula for predicting the sediment transport rate. The first goal of this dissertation is to find a unified total sediment transport equation for all rivers. On the other han
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27

Gamboa, Melgarejo Jorge Luis, and Rios Valeria Sandra Quintanilla. "Modelamiento numérico hidrodinámico para reducir la socavación local en pilares cilíndricos y rectangulares de puentes de ríos." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/657642.

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En la presente investigación se evaluó la eficiencia de las pilas de sacrificio en la reducción de la socavación local de pilares cilíndricos y rectangulares de puentes de ríos. Para ello, se realizaron modelaciones numéricas hidrodinámicas, en el software Iber, y se aplicaron las ecuaciones de la Universidad Estatal de Colorado (CSU) y de Froechlich. En esta investigación, se emplearon los resultados del ensayo físico del pilar cilíndrico aislado de 30mm de diámetro, ensayado en el artículo científico desarrollado por Vahdati et al. (2020). Asimismo, se emplearon los resultados del pilar
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28

Bressan, Filippo. "Large Eddy Simulation of turbulence around a scoured Bridge Abutment." Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3511.

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2008/2009<br>In this work the turbulent field developing in case of local erosion around a 45° wing-wall bridge abutment was investigated numerically. Three different scour conditions were considered: beginning of the process, logarithmic phase and equilibrium stage. The flow field was computed using a wall-resolving large eddy simulation (a simulation where the near-wall viscous sub-layer is directly resolved) and the bathymetric data were taken from physical experiments with an equivalent geometry. The dynamics of the coherent structures forming around the obstacle and inside the scour-hole
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29

Bazan, Ravines Mauricio Javier, and Vargas Jorge Daniel Coronado. "Control de erosión fluvial en la curva externa, haciendo uso de paletas sumergidas en los sectores La Perla-Florida y Cantagallo en el Rio Rímac aplicando modelamiento numérico." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/654947.

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La presente tesis tiene como objetivo evaluar una propuesta para el control de erosión fluvial de la curva externa del rio Rimác ubicada entre los sectores Cantagallo y La Perla en Chosica, verificando su eficacia a través de un modelamiento con fines de calcular la socavación producida para diferentes periodos de retorno y proponer como estructura de control a las paletas sumergidas, comparando ambos resultados obtenidos para evaluar sus beneficios. El tramo escogido presentó fallas en los muros de contención ubicados a lo largo del cauce según un estudio previo realizado por el INGEMMET, po
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30

ARYA, ADITYA. "SCOUR AROUND DIFFERENT SHAPES OF PIERS AT DIFFERENT ORIENTATION WITH FLOW." Thesis, 2014. http://dspace.dtu.ac.in:8080/jspui/handle/repository/15500.

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Scour is the process of local lowering of stream bed elevation which takes place in the vicinity or around a structure constructed in flowing water. Scour takes place around bridge piers, abutments, around spurs, jetties and breakwaters due to modification of flow pattern in such a way as to cause increase in local shear stress. Due to improper knowledge of scour around bridge pier, there were lots of bridges failure cases faces by our country which leads to economic loss and life loss. To understand the phenomenon of local scour around piers an attempt is done by experiment on different shape
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CONG, XING-LU, and 叢興魯. "Study of local scour for engineering structures." Thesis, 1992. http://ndltd.ncl.edu.tw/handle/21344848755944823611.

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Huang, Cheng-Chang. "Local scour at isolated obstacles on river beds." Thesis, 1990. http://hdl.handle.net/1957/37321.

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Maximum equilibrium scour depths, equilibrium scour volumes, and induced equilibrium movements at isolated obstacles on river beds were investigated in clear-water scour. The research was achieved by a systematic flume study based on the results of dimensional analysis of local scour. The main tested obstacles for local scour were cubes. Local scour at a circular cylinder of aspect ratio 1 and a sphere were also examined for comparison with scour at cubes. Each obstacle was placed on a flat movable bed and oriented normal to the incident flow. Non-cohesive uniform medium sand and very fine gra
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Wang, Shin-Kuei, and 王新貴. "Local Scour around Non-uniform Piers and Collar." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/80702982838879313086.

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碩士<br>國立中央大學<br>土木工程研究所<br>90<br>This study uses experimental mobile channel to examine the characteristics of local scour around non-uniform piers and the piers with collar protection. The maximum scour depth and the range of the scour hole is analyzed. Furthermore, the change of scour at different exposure elevations is compared by performing a series of case studies. When the collar is close to the bed, the scour depth decreases. When it’s top is flush with the bed, the scour depth decreases obviously, and both the downflow and horseshoe vortex are guided to the downstream successfully far
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Wu, Jiun_Hong, and 吳俊鋐. "Abutment local scour and velocity distribution by an." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/97883830973258966680.

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碩士<br>國立成功大學<br>水利及海洋工程學系<br>88<br>ABSTRACT Previous in-bank flow studies showed that a main channel transitional section in front of and behind a bridge abutment in a compound channel could reduce abutment local scour. This study is interested in that how this transition affects the topography of the channel during over-bank flow conditions. Three experimental sets with or without this transition were thus conducted in a 20x1.1x0.3m movable bed compound channel that was constituted of a trapezoidal main channel and two horizontal floodplains. At each experiment, equilibrium loc
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CHANG, YI-HSIN, and 張藝馨. "Local Scour aroung Nonuniform Piers and Pile Foundations." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/44218843847065938388.

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碩士<br>國立中央大學<br>土木工程研究所<br>88<br>Most rivers in Taiwan are severely degrading during last two decades due to fast growing in-stream sand mining and construction of water supply or diversion works. Consequently, the exposure of bridge foundations, such as caissons and piles of bridge piers , is one of the most critical issue for the design and maintenance of river-crossing bridges. Inadequate design of countermeasures at bridge crossings may incur further local and contraction scours. The scouring process, such as maximum scour depth and scour dept and scour depth and scour range, around non-un
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Chen, Feng-Kun, and 陳峰琨. "Investigation of Local Scour Effects in Alluvial Rivers." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/90198126109564963623.

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碩士<br>國立臺灣大學<br>土木工程學研究所<br>99<br>In this thesis, the flow field and physical mechanism of local scour problem around the bridge piers is mainly used by numerical simulation. Two different field cases are studied: they are the bridge scour effects surrounding the Hou-Feng Bridge and the gap scour effects about the stepped concrete block grade control structure in Ta-Jia river, respectively. It is an extremely difficult problem by using the numerical programming to solve these problems. Hence we seek the help from the commercial software, Flow-3D, to analyze the problem. The problem setting inc
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Chen, Jui-Chang, and 陳瑞昌. "The Local Scour Behavior Downstream of Aprons and Sills." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/50984262958758422572.

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碩士<br>國立中央大學<br>土木工程研究所<br>90<br>Aprons and sills are the common countermeasures for protecting the downstream riverbed. In this study the local scour behavior downstream of aprons and sills are examined by employing laboratory experiments. The scour characteristics of two homogeneous sand beds caused by the wall jet, the wall jet with apron, and the wall jet with end sill, are compared. By using theory and experimental data, a prediction model is developed, and is used to explore the characteristics of local scour near those structures. Keywords：local scour、aprons 、sills、scour hole
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Cheng, Ko-Yu, and 鄭可佑. "The effect of aprons and sills local scour reduction." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/74698602964634365419.

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碩士<br>國立中央大學<br>土木工程研究所<br>92<br>In order to protect downstream riverbed of sluice gates, many energy dissipaters such as aprons and sills are installed on the channel bed. This study examines the effect of length of aprons and types of double sills on the local scour behaviors. The variation of head cutting length and cyclic scouring are observed and measured in the experiments. The characteristics of scouring holes caused by the wall jets with aprons and the wall jets with double sills are compared. The characteristics of local scour near structures is explored by analyzing the experiment
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39

Tsai, Kun-lin, and 蔡坤霖. "Local Scour around Eccentric Circular Piers with Steady Flow." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/74167331488813937712.

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碩士<br>逢甲大學<br>水利工程所<br>94<br>The research utilize hydraulic models to simulate local scour depth and scour depth change with time for non-uniform pier diameter ratio D/D* of 0.4 and 0.7, and different type pier and initial bed level relative under the foundation top elevation under steady flow. (V/Vc=0.95) The research results show that the different scour depth with different initial bed level relative and different type pier, and accompany different type pier will make maximum scour depth to different position. The maximum scour depth of un-exposed bridge foundation (Y=+10 mm) is less than e
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Lai, Wen-Jenq, and 賴文正. "Study on Local Scour Bridge Pier in Steep Channel." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/23494781754028921838.

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Castiblanco, Mário Enrique Moreno. "Experimental study of local scour around complex bridge piers." Doctoral thesis, 2016. https://repositorio-aberto.up.pt/handle/10216/85290.

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Cheng, Wei Shi, and 鄭暐曦. "Local Scour around Nonuniform Circular Piers under Unsteady Flow." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/70487305212544156755.

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碩士<br>國立中興大學<br>土木工程學系<br>93<br>One of the major problems relating to the bridge damage in Taiwan is the exposure of the bridge foundations. General scour may occur in a river due to either the man-induced or natural causes. Local scour is attributable to the existence of the bridge. Both general and local scours may affect the safety of a bridge. In this study, different types of unsteady flow hydrographs, including the advanced, symmetrical, and delayed hydrographs, with non-uniform piers were used to conduct the laboratory bridge scouring experiments. The variation of local scour depth
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Lin, Jiing Hwel, and 林景輝. "Study on the Local Scour around Cylindrical Bridge Piers." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/28934330597838009934.

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Castiblanco, Mário Enrique Moreno. "Experimental study of local scour around complex bridge piers." Tese, 2016. https://repositorio-aberto.up.pt/handle/10216/85290.

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Tafarojnoruz, Ali, Roberto Gaudio, and Sergio Rizzuti. "Flow-altering countermeasures against local scour at bridge piers." Thesis, 2014. http://hdl.handle.net/10955/596.

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Scuola di Dottorato "Pitagora" in Scienzae Ingegneristiche, Ciclo I, a.a.2007-2010<br>The ability to protect bridge piers and abutments against scour is critical to bridge safety. Excessive pier scour can cause high maintenance costs or even bridge collapse resulting in the interruption of traffic and possibly death. Up to now, various types of countermeasures have been recommended to reduce scouring around pier foundations. The countermeasures against pier scour can be broadly classified into two categories: (1) flow-altering and (2) bed-armouring countermeasures. This thesis focuses on
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Lee, Jun-Ying, and 李俊穎. "Local Scour around Concentric Circular Piers with Various Flow Hydrographs." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/03694785815647009079.

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碩士<br>逢甲大學<br>水利工程所<br>93<br>This study uses hydraulic models to measure the variation of local scour depth with time for non-uniform pier diameter ratios of 0.4 and 0.7, and different initial bed level relative to the foundation top elevation under unsteady flows with advanced, central and delayed peaks. The research results show that the scour depth increases with an increase of flow intensity under different types of unsteady flow hydrographs. The scour depth reaches a maximum value within the rising phase of the unsteady flow. The scour variation for the central peak hydrograph is simila
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Cheng, Jen-hao, and 鄭人豪. "Local Scour around Eccentric Circular Piers under Unsteady Flow Conditions." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/97836784867224776711.

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碩士<br>逢甲大學<br>水利工程所<br>95<br>This study uses hydraulic models to measure the variation of local scour depth with time for eccentric pier diameter ratios D/D*of 0.4 ~ 0.7, and different initial bed level relative to the foundation top elevation under unsteady flows with advanced, central and delayed peaks. The research results show that the scour depth increases with an increase of flow intensity under different types of unsteady flow hydrographs. The scour depth reaches a maximum value within the rising phase of the unsteady flow. The scour variation for the central peak hydrograph is similar
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Huang, Ren-Xiao, and 黃任孝. "Study on Local Scour around Bridge Pier with Diversion Device." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/77549548467684227447.

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碩士<br>逢甲大學<br>土木及水利工程研究所<br>88<br>The local scour around the bridge pier can be effectively mitigated or controlled, and in turn, the safety of the bridge may be enhanced if the bridge pier is equipped with a diversion device to lessen the impinging downflow. This study used part of the Kikkawa theory and the innovative diversion device which has nine types of models to conduct various clear-water hydraulic tests under the conditions of fixed channel slop (s=0.01), water depth (h=9.3) and bed material (d50=0.75mm). It is found that the diversion device which is attached to the round-nose pier
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Jhong, Ren-Kai, and 鍾仁凱. "Study on Local Scour and Sediment Exchange around Spur Dikes." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/vj36cf.

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博士<br>國立交通大學<br>土木工程系所<br>105<br>Spur dikes are hydraulic structures that extend from a river bank into the river channel, and in on-site applications, they are present in groups. In river engineering, spur dikes have diverse functions. When applied to erodible banks, spur dikes can deflect near-bank currents to the river center. In addition, the recirculation zones behind spur dikes have a slow flow velocity, which increases sedimentation at the riverbank footing and reduces riverbank erosion. Although spur dikes serve multiple river management functions, their inherent structure hampers wate
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Wen-Yi, Chang, and 張文鎰. "Simulation and experimental verification for local scour around circular piers." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/43126751296736166460.

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博士<br>國立臺灣大學<br>土木工程學研究所<br>91<br>Steep riverbed slopes and rapidly varying discharges with relatively short duration are common characteristics in Taiwan’s rivers. During such a flood, severe scour around the bridge pier always occurs near the peak-flow discharge. These unsteady flow characteristics increase the difficulties of estimating the scour depth at pier nose under unsteady flow for design purposes. In addition, bed materials are generally composed of non-uniform sediment in alluvial river. Under the hydraulic sorting of surface bed materials, the coarser sediment tends to be left
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