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Dissertations / Theses on the topic 'Shear stress bed'

Author: Grafiati

Published: 10 March 2023

Last updated: 31 July 2025

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1

Su, Yan. "An annular fluidized-bed experiment for inter-granular shear stress." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0008/MQ31257.pdf.

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2

Yang, Qingjun (Judy Qingjun). "Estimation of the bed shear stress in vegetated and bare channels." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99580.

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Thesis: S.M., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 69-77).<br>The shear stress at the bed of a channel influences important benthic processes such as sediment transport. Several methods exist to estimate the bed shear stress in bare channels without vegetation, but most of these are not appropriate for vegetated channels due to the impact of vegetation on the velocity profile and turbulence production. This study proposes a new model to estimate the

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3

Yaeger, Mary A. "MEAN FLOW AND TURBULENCE AROUND TWO SERIES OF EXPERIMENTAL DIKES." Thesis, The University of Arizona, 2009. http://hdl.handle.net/10150/193453.

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Scour around various structures obstructing flow in an open channel is a common problem; therefore a better understanding of how turbulent flow affects sediment transport is needed. Additionally, is it the mean flow or the turbulence properties that are more important in contributing to bed shear stress? To this end, an experimental study was conducted in a fixed-bed flume containing a series of dikes. Turbulence intensities and Reynold's stresses were calculated from 3-D velocity measurements gathered with a microADV. Results showed that the maximum shear stress was nearly 12-20 times that of

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4

Emerson, Samuel D. "The role of bed shear stress in sediment sorting patterns in a reconstructed, gravel bed river." Thesis, San Jose State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10128515.

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<p> The role of bed shear stress in bed surface grain size sorting was investigated on a reconstructed reach of the Merced River in the Central Valley of California. Pebble count data were collected at the inside, middle, and outside of ten bends in April 2015 and compared to data from pebble counts conducted in previous years. Output from a previously developed 2D flow model (FaSTMECH) was compared to critical shear stresses calculated from median grain-size data. Comparison of pebble count results from 2002 through 2015 showed that there was no temporally consistent pattern of coarsening or

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5

Sarra, Angela M. "Particle-wall shear stress measurements within the standpipe of a circulating fluidized bed." Morgantown, W. Va. : [West Virginia University Libraries], 2001. http://etd.wvu.edu/templates/showETD.cfm?recnum=2078.

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Thesis (M.S.)--West Virginia University, 2001.<br>Title from document title page. Document formatted into pages; contains xi, 137 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 136-137).

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6

Perret, Emeline. "Transport of moderately sorted gravels at low bed shear stress : impact of bed arrangement and fine sediment infiltration." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1223/document.

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Le but de cette thèse est de comprendre la dynamique des graviers au sein des rivières alpines à faible contrainte en utilisant des expériences en laboratoire. Ces rivières sont souvent composées d’une large gamme de sédiments, allant des argiles aux galets. Ces différentes classes sédimentaires peuvent interagir entre elles, ce qui peut rendre difficile l’estimation du transport solide. Des expériences en laboratoire ont été conduites en écoulements instationnaires dans un canal de 18m de long et 1m de large. Deux types de lits ont été étudiés : lits unimodaux et bimodaux. Une attention parti

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7

Thompson, Charlotte E. L. "The role of the solid-transmitted bed shear stress of mobile granular material on cohesive bed erosion by unidirectional flow." Thesis, University of Southampton, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.398824.

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8

Sime, Louise C. "Reach-scale spatial variation of grain-size, shear stress, and bedload transport in gravel-bed rivers." Thesis, University of Sheffield, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.401128.

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9

Valentine, Kendall. "Characterization of the bed, critical boundary shear stress, roughness, and bedload transport in the Connecticut River Estuary." Thesis, Boston College, 2015. http://hdl.handle.net/2345/bc-ir:104550.

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Thesis advisor: Gail C. Kineke<br>This study characterizes the bed of the Connecticut River estuary in terms of grain size and bedforms, and relates these to river discharge, tidal currents, and sediment transport. Over four field excursions, sediment cores were collected, in addition to bathymetry surveys, and water column measurements. A three-dimensional circulation and sediment transport model calculated boundary shear stress over the same time. The bed of the estuary is composed mostly of sand, with small amounts of fine sediments. Deposition of fine sediments is limited by the landward e

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10

Mayoral, Helen. "Particle Size, Critical Shear Stress, and Benthic Invertebrate Distribution and Abundance in a Gravel-bed River of the Southern Appalachians." Digital Archive @ GSU, 2011. http://digitalarchive.gsu.edu/geosciences_theses/31.

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To determine the relationship between the abundance and density of benthic invertebrates, and the critical shear stress of individual grain sizes, a reach along Smith Creek, was divided into ten 2m x 2m quadrants. Within each quadrant, five randomly selected clasts for each grain size ranging from 2.26 to 25.6 cm were cleaned for benthic invertebrates. Wolman pebble counts for each quadrant were also conducted and used to determine the critical Shields stress per grain size fraction from the model given by Wiberg and Smith (1987) that explicitly accounts for particle hiding/sheltering effect

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11

Genovese, Marco. "Analisi sperimentale e misura diretta dello sforzo taglianti di fondo di correnti in canale a pelo libero." Doctoral thesis, Universita degli studi di Salerno, 2015. http://hdl.handle.net/10556/1976.

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2013 - 2014<br>The manuscript presents the study that led to the design, implementation and testing of an innovative system for the direct measurement, in the laboratory, of the bed shear stress of flows in open channel. The related analysis has been intended at exploring the possibility of providing a new tool to survey research, especially in the context of the erosion of the bed during the events known as debris flow. In facts, the shear stress between the debris flow and the ground over which it propagates, is now recognized as one of the key parrrameters that affect the most dynamic local

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12

Bouckaert, Frederick. "Characterization of microhabitat flow regimes in streams and rivers on the basis of near-bed velocity, shear stress and turbulence intensity measured with an Acoustic Doppler Velocimeter (ADV)." Thesis, Bouckaert, Frederick (1995) Characterization of microhabitat flow regimes in streams and rivers on the basis of near-bed velocity, shear stress and turbulence intensity measured with an Acoustic Doppler Velocimeter (ADV). Honours thesis, Murdoch University, 1995. https://researchrepository.murdoch.edu.au/id/eprint/63073/.

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Near-bed flow regimes in streams and rivers remain a poorly researched topic, despite its importance for the distribution of benthic invertebrates. The poor characterization of macroinvertebrate microhabitat severely constrains the further understanding of instream flow requirements to protect the ecological integrity of streams and rivers, and may be responsible for the wide confidence intervals often associated with macroinvertebrate sampling. Traditionally, benthic habitats have been characterized by depth, substratum and mean velocity (measured at 0.4 of the depth from the bed) despite evi

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13

Dornelas, Breno Almeida. "Análise experimental da tensão de cisalhamento mínima para suspensão de partículas em um leito horizontal." Universidade Federal do Espírito Santo, 2009. http://repositorio.ufes.br/handle/10/6248.

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Made available in DSpace on 2016-12-23T14:08:13Z (GMT). No. of bitstreams: 1 Breno Almeida Dornelas - parte 1.pdf: 376911 bytes, checksum: b45e88c007da3db1f74fa38428506e5c (MD5) Previous issue date: 2009-12-22<br>A remoção eficiente de cascalhos ainda é um desafio na perfuração de poços para produção de óleo e gás. O ponto crítico corresponde ao estágio horizontal da perfuração que intrinsecamente tende a formar um leito de partículas sedimentadas na parte inferior do poço em perfuração. A erosão desse leito de cascalhos oriundos do solo perfurado depende principalmente da tensão de cisalham

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14

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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15

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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16

Louis, Stephen. "Continuer à irriguer quand les lacs-réservoirs de barrage souffrent de taux de sédimentation sévères - Recommandations d'amélioration de la gestion du principal canal d'irrigation alimenté par l'ouvrage répartiteur de Canneau (Haïti)." Doctoral thesis, Universite Libre de Bruxelles, 2019. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/288808.

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L’État haïtien, pour faire face à l’insécurité alimentaire que connaît sa population (à croissance rapide et à faible revenu), s’appuie particulièrement sur la Vallée du département de l’Artibonite qui constitue depuis toujours le véritable grenier agricole du pays, en fournissant, à elle seule, plus de 80% de la production rizicole nationale. Cette production agricole assure non seulement les besoins alimentaires de la population locale, mais également ceux particuliers des départements voisins (Ouest, Nord et Centre).L’irrigation de cette vaste plaine agricole (32400 ha de terres agricoles i

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17

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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18

Galeta, Martin. "Zanášení vývarů dnovými splaveninami." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371904.

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The main goal of this study is to define the technique to be used to assess the aggradation (by bed load) and degradation (of sediments) of the recessed as well as non-recessed stilling basins of rectangular cross section; when the hydraulic jump occurs in the stilling basin where the submergence coefficient equals 1,05. It consists of two parts, theoretical and experimental. The theoretical part summarizes the related theory on a hydraulic jump, design of a stilling basin, an incipient motion of sediment, an assessment of silting and scouring of the stilling basin. The second part, the actual

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19

Chassagneux, François-Xavier. "Etude expérimentale des processus hydro-sédimentaires sous le déferlement de vagues irrégulières." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENI011.

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Cette thèse présente une simulation, en canal à houle, des processus naturels hydrodynamiques etde transport sédimentaire de la zone de déferlement bathymétrique. L’analyse spatio-temporelle dela structure moyenne et instantanée de l’écoulement repose sur un jeu de mesures hauterésolutions.On effectue une étude des processus de couche limite et de l’impact des processus desurface libre sur le fond sédimentaire.Un profil de plage en forme de terrasse est engendré par le déferlement de séries de vagues irrégulières(JONSWAP) sur un fond mobile constitué de sédiments de faible densité (_ _ 1.19).

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20

Desombre, Jonathan. "Modélisation vof de l’écoulement de jet de rive en surface et dans une plage perméable." Thesis, Pau, 2012. http://www.theses.fr/2012PAUU3038/document.

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Cette thèse propose une modélisation numérique 2D des écoulements en zone de jet de rive avec un code Volume-Of-Fluid. Dans un premier temps, le détail de la structure interne de l’écoulement de jet de rive généré par l’effondrement d’un front d’onde turbulent sur une plage imperméable lisse est étudié. Le modèle numérique est ensuite étendu à la simulation des écoulements en milieu poreux internes à la plage. L’utilisation d’une unique équation de quantité de mouvement (VARANS) et de la méthode 1-fluide, permet de résoudre simultanément les écoulements de l’eau et de l’air à la surface et dan

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21

Jeffcoate, Penelope. "Experimental and computational modelling of 3-D flow and bed shear stresses downstream from a multiple duct tidal barrage." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/experimental-and-computational-modelling-of-3d-flow-and-bed-shear-stresses-downstream-from-a-multiple-duct-tidal-barrage(13b4b1d2-d144-4510-bc46-50a25739e41c).html.

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The near-field depth-varying velocities and resulting bed stresses downstream from a tidal barrage have not previously been studied. The flow through and downstream of a row of seven open draft tubes in a barrage has been investigated through laboratory experiment in a wide flume, 3-D RANS CFD simulation and 2-D depth-averaged computation. When there is no turbine representation and hence negligible swirl in the draft tubes, agreement between the experiments and 3-D modelling is shown to be good, including the prediction of an asymmetric Coandă effect. With the addition of bulb bodies and vane

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22

Chaloupka, Martin. "Vliv účinků poddolování na volbu typu nosné konstrukce mostu v km 332,420 trati Dětmarovice - Č. Těšín." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225534.

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The aim of the master’s thesis was t odevelop alternative solutions supporting steel structure of the railway bridge on the undermined area. The range of single fields were chosen based on the location of existing substructures. Reducing the width of bridge openings were not allowed. Based on the geodetic survey plans were drawn up clear of the current state. On the basis of specifications for developing a detailed process was chosen variant Gerber’s beam reinforced with an arch in mean field. For this variant was performed structural analysis of the main parts of the main structure of the bri

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23

Guan-ShiunHuang and 黃冠勳. "Measurement of bed shear stress in swash zone." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/51390792805358396838.

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碩士<br>國立成功大學<br>水利及海洋工程學系碩博士班<br>100<br>The hydrodynamics in swash zone has been an important subject for scientist and engineers due to its importance and complexity. Direct measurements of bed shear in the swash zone are presented. The data were obtained using a shear plate in laboratory swash zone. Data were obtained across the swash zone. The ﬂow velocities through the full swash cycle were obtained through measured velocity data. The measured stresses and measured ﬂow velocities were subsequently used to back-calculate instantaneous local skin friction coefﬁcients using the quadratic dra

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24

Chien-yehHo and 何建業. "Numerical simulation of bed shear stress in swash zone." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/19167847707032824333.

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碩士<br>國立成功大學<br>水利及海洋工程學系碩博士班<br>101<br>In this study, the dynamic process of solitary wave propagating from shore to swash zone is investigated numerically by using a 2-D Reynolds Averaged Navier-Stokes (RANS) solver. The turbulence field is described by using a non-linear k-ε turbulence closure model and the free surface configuration is tracked by the Volume Of Fluid (VOF) method. To validate the numerical model, the results were compared with theoretical solution and existing experimental data. The result of the validation shows good agreement. Besides, the numerical model is applied to in

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25

蔡立宏. "Bed shear stress and friction factor under random waves." Thesis, 1991. http://ndltd.ncl.edu.tw/handle/86757898070163624253.

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26

Gao, Yu-feng, and 高郁峰. "Characteristics of bed shear stress in the coastal waters." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/18700815191142394144.

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碩士<br>國立中山大學<br>海洋生物科技暨資源學系研究所<br>100<br>A 3-axis acoustic Doppler Velocimeter (ADV) with high sampling rate was used to measure the bed shear stress and turbulence under wave-current interaction conditions in this study. Experimental sites include laboratory tank, Love River in Kaohsiung and Howan coastal waters in Pingtung. Bed shear stress is estimated primarily by the inertial dissipation method, also by the turbulent kinetic energy method and eddy correlation method. Results of the laboratory experiments indicate that the bed shear stress increases as both the flow speed and wave height i

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27

Zen, Lin Yio, and 林佑任. "Variation of bed shear stress during flood flow in compound channel." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/78613031566244408272.

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28

Jing-Hua, Lin, and 林敬樺. "Application of Slip Velocity Boundary Condition to EstimateWaves induced Bed Velocity and Bed Shear Stress." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/67232313706557911343.

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博士<br>國立中山大學<br>海洋環境及工程學系研究所<br>101<br>In the present study, a new and simple method for determining the slip velocity (also called the bed velocity) on the solid-fluid interface in the wave boundary layer is proposed. Based on experimental and numerical results, when waves travel over a rigid permeable seabed, a nonzero slip velocity exists at the solid-fluid interface. The defect of a small slip velocity has been found to occur in previous studies and is usually encountered in fluid-porous layer problems. In the wave-rigid permeable seabed problem, the slip effect depends on the properties o

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29

Lai, Tai-Zon, and 賴泰榮. "Shear Stress Distribution on Channel Bed of a Scour Hole by Free Overfall." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/91549615834655806231.

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碩士<br>國立中興大學<br>土木工程學系<br>84<br>AbstractThe main objective of this study was to investigate the variations of the distribution of shear stress along the scour hole downstream of a weir during the evolution of the scour hole.The shapes of the scour hole were selected based on the results of the local scour testswith standard sand. An electromagnetic current was used to measure the flow field in theplunge pool. Based on the analysis of the laboratory dada, it was found that in general the sco

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Lo, Rou-Yu, and 羅若瑜. "Microscopic simulations of rock abrasion induced by bed shear stress and particle saltation." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/23195502689070111755.

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碩士<br>國立交通大學<br>土木工程學系<br>99<br>River discharge in Taiwan varies a lot during flooding season; this situation often results in unstable river channel. The intensive erosion of bedrock during flood may also endanger the stability of cross-river structures, especially for cases of river bed composed of soft rocks. This study makes use of numerical simulation as “virtual erosion test” to explore the mechanisms of rock erosion. In the simulation, rock material is modeled as a granular assemblage with inter-particle bonding; the erosion process is simulated as particles’ release due to de-bonding

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31

Cantrell, William. "Method of Evaluation for Stream Bed Shear Stress and Sediment Transport Capacity in Urbanizing Watershed: Implications for Stream Restoration." 2009. http://trace.tennessee.edu/utk_gradthes/27.

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In the field of stream restoration, use of a one-dimensional flow model with typical Manning’s n values for an open channel greatly over-predicts bed shear values. This, in turn, incorrectly predicts the size of the mobile fraction on the bed and if used in a bedload transport function over-predicts mass movement of the bed material. This study identified 12 sites for which watershed and reach characteristics were compiled, and bedload sampling was performed. This information was used to produce an empirical relationship between reach pebble count data and an effective Manning’s n value that c

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Cantrell, William R. "Method of evaluation for stream bed shear stress and sediment transport capacity in urbanizing watershed implications for stream restoration /." 2009. http://trace.tennessee.edu/utk_gradthes/27.

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Chen, Xingnian. "Numerical Study of Abutment Scour in Cohesive Soils." 2008. http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-225.

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This research is part of the extension of the SRICOS-EFA method for predicting the maximum scour depth history around the bridge abutment. The basic objective is to establish the equation for predicting the maximum bed shear stress around the abutment at the initial condition of scouring. CHEN3D (Computerized Hydraulic ENgineering program for 3D flow) program is utilized to perform numerical simulations and predict bed shear stress before scouring. The Chimera technique incorporated in CHEN3D makes the program capable of simulating all kinds of complex geometry and moving boundary. CHEN3D prog

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Tait, Simon J., J. Heald, I. K. McEwan, et al. "Probabilistic modelling of bed-load composition." 2009. http://hdl.handle.net/10454/2850.

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No<br>This paper proposes that the changes which occur in composition of the bed load during the transport of mixed-grain-size sediments are largely controlled by the distributions of critical entrainment shear stress for the various size fractions. This hypothesis is examined for a unimodal sediment mixture by calculating these distributions with a discrete particle model and using them in a probabilistic calculation of bed-load composition. The estimates of bed-load composition compare favorably with observations of fractional transport rates made in a laboratory flume for the same sediment,

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35

Lai, Chin-Chun, and 賴志鈞. "Measurement and analysis of downstream flow and shear stress induced by a submerged vane in a fixed bed channel." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/39396142096396618671.

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碩士<br>國立宜蘭大學<br>土木工程學系碩士班<br>97<br>Submerged vane system is a technique for river bank protection. By inducing a wake vortex downstream, the secondary vortex in the channel bend responsible for the erosion of the concave bank is reduced and the foundation of the bank is strengthened. Due to the viscous and turbulent dissipation of the fluid flow, the strength of the vane-induced near bed transverse shear stress gradually decreases both in the transverse and stream-wise direction. Using a 3D Acoustic Doppler Velocimeter, this study measured the near bed transverse velocity induced by vanes with

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36

Glasbergen, Kenneth. "The Effect of Coarse Gravel on Cohesive Sediment Entrapment in an Annular Flume." Thesis, 2014. http://hdl.handle.net/10012/8288.

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The amount and type of cohesive sediment found in gravel river beds can have important implications for the health of aquatic biota, surface/groundwater interactions and water quality. Due to landscape disturbances in the Elbow River watershed, increased sediment fluxes have negatively impacted fish habitat, water quality and water supply to the City of Calgary. However, little is known about the source of cohesive sediment and its interaction with gravel deposits in the Elbow River. This research was designed to: 1) quantify the transport properties (critical shear stress for erosion, depos

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Antony, S. J., M. Al-Sharabi, Nejat Rahmanian, and T. Barakat. "Shear stress distribution within narrowly constrained structured grains and granulated powder beds." 2015. http://hdl.handle.net/10454/7544.

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An experimental study is presented here to understand the stress transmission characteristics under different geometrical arrangements of particulates inside a narrow chamber subjected to axial compression loading. The multi-grain systems considered here are face-centred, simple cubic and poly-dispersed structures, as well as inclusions embedded inside seeded, unseeded and cohesive powder bed of Durcal (calcium carbonate). The distribution of the maximum shear stress, direction of the major principal stress and shear stress concentration factor were obtained using photo stress analysis tomogra

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