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Tesis sobre el tema "Bed roughness"

Autor: Grafiati

Publicado: 1 de febrero de 2025

Última modificación: 31 de julio de 2025

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1

Robert, Andre. "Statistical modelling of sediment bed profiles and bed roughness properties in alluvial channels." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.292244.

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2

Sorenson, Kent S. (Kent Soren). "Moveable bed roughness and sediment resuspension in the field." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/35047.

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3

Wilbers, Antoine. "The development and hydraulic roughness of subaqueous dunes /." Utrecht : Koninklijk Nederlands Aardrijkskundig Genootschap, 2004. http://www.loc.gov/catdir/toc/fy0708/2004464077.html.

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4

Lefebvre, Alice. "Bed roughness over vegetated beds : sonar imaging techniques and effect on unidirectional currents." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/72139/.

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Small scale roughness of the seafloor is of direct relevance to a range of interests, including boundary layer hydrodynamics, sediment transport and high-frequency acoustic scattering. Despite its importance, only few studies have quantitatively resolved seafloor height at the relevant scales. In particular, characterisation of roughness over vegetated beds is needed to better understand hydrodynamics and sediment transport in the coastal zone. A new Benthic Roughness Acoustic Device (BRAD) has been developed to define microtopographical roughness through high-resolution imagery of the seabed.

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5

Rahman, Shikha. "Effect of bed roughness on scalar mixing in turbulent boundary layers." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/32794.

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6

Batt, Rachel Louise. "The influence of bed roughness on the dynamics of gravity currents." Thesis, University of Leeds, 2008. http://etheses.whiterose.ac.uk/11282/.

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To date the influence of bed roughness onl the propagation and dynamics of gravity currents has been largely neglected. A new physical modelling dataset has been compiled, which details the fundamental affects of several bed roughnesses on lock-release gravity currents. Five bed configurations were chosen encompassing 'grain' and 'form' type elements at a range of spacings. 1%, 5% and 10% initial density excesses were studied and the effect of removing the buoyant ambient fluid between the elements examined. Observations due to changing the current depth relative to the element height were als

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7

Hersberger, Daniel S. "Wall roughness effects on flow and scouring in curved channels with gravel bed /." Lausanne, 2002. http://library.epfl.ch/theses/?display=detail&nr=2632.

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Thèse sciences techniques, EPF Lausanne, no 2632 (2002), Faculté Environnement naturel, architectural et construit ENAC, Domaine du génie civil. Directeur: A. Schleiss ; rapporteurs: M. Altinakar, G.-R. Bezzola, J. Gessler.

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8

Kendall, Robert L. "Sand bed roughness in the nearshore, COAST 3D experiment, Egmond aan Zee, the Netherlands." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2000. http://handle.dtic.mil/100.2/ADA380327.

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Thesis (M.S. in Meteorology and Physical Oceanography)--Naval Postgraduate School, June 1998.<br>Thesis advisor(s): Gallagher, Edith L. ; Thornton, Edward B. "June 2000." Includes bibliographical references (p. 75-76). Also available online.

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9

Velioglu, Deniz. "Effects Of Different Bed Roughnesses On The Characteristics Of Hydraulic Jumps." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614018/index.pdf.

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In practice, baffle blocks and sills are commonly being used to stabilize the location of a hydraulic jump and shorten the length of a stilling basin. On the other hand, gravels, corrugations and rectangular prismatic roughnesses which cover the entire length of the basin or placed in a staggered manner may be an alternative. The objective of this study is to determine the effects of these roughness elements on the characteristics of hydraulic jumps such as conjugate depth, jump length and energy dissipation using experimental data collected from the previous studies. The investigations show t

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10

Khan, Muhammad Ijaz. "The influence of two-dimensional bed roughness on the flow structure of a turbulent boundary layer." Thesis, University College London (University of London), 2004. http://discovery.ucl.ac.uk/1446901/.

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Experiments have been performed to investigate the relationship between the geometry of an idealised bed roughness and the structure of the turbulent boundary layer above. This work has particular applications in relation to architecture and environmental health, designing comfort for pedestrians and managing environmental pollution. Experiments were carried out in a laboratory water flume to study the turbulence structure generated under both rough and smooth bed conditions. The relationship between small scale turbulent eddies formed between the elements of a two-dimensional bed roughness an

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11

Plott, James Read. "A Generalized Log-Law Formulation For a Wide Range of Boundary Roughness Conditions Encountered in Streams." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/76866.

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It is demonstrated that the method for locating a velocity profile origin, or plane of zero velocity, by fitting log profiles to streamwise velocity measurements is applicable to a larger range of roughness scales than previously expected. Five different sets of detailed, experimental velocity measurements were analyzed encompassing sediment-scale roughness elements, roughness caused by rigid vegetation, and large-scale roughness elements comprised of mobile bedforms. The method resulted in similar values of normalized zero-plane displacement for all roughness types considered. The ratios of z

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12

Tatman, Eric-Paul Daniel. "The Characterization and Fatigue Life Impact from Surface Roughness on Structurally Relevant Features Produced Using Additive Manufacturing." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1564754673356237.

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13

Simsek, Cagdas. "Forced Hydraulic Jump On Artificially Roughened Beds." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608038/index.pdf.

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In the scope of the study, prismatic roughness elements with different longitudinal spacing and arrangements have been tested in a rectangular flume in order to reveal their effects on fundamental characteristics of a hydraulic jump. Two basic roughness types with altering arrangements have been tested. Roughness elements of the first type extends through the channel width against the flow with varying length and pitch ratios for different arrangements. The second type is of staggered essence and produced by piecing the roughness elements defined in the initial type into three parts which are

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14

Thein, Myint. "Experimental investigation of flow resistance and velocity distributions in a rectangular channel with large bed-roughness elements." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19580.

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15

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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16

Yee, Irene. "Powder Bed Surface Quality and Particle Size Distribution for Metal Additive Manufacturing and Comparison with Discrete Element Model." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1888.

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Metal additive manufacturing (AM) can produce complex parts that were once considered impossible or too costly to fabricate using conventional machining techniques, making AM machines an exceptional tool for rapid prototyping, one-off parts, and labor-intensive geometries. Due to the growing popularity of this technology, especially in the defense and medical industries, more researchers are looking into the physics and mechanics behind the AM process. Many factors and parameters contribute to the overall quality of a part, one of them being the powder bed itself. So far, little investigation

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17

Bomminayuni, Sandeep Kumar. "Large eddy simulation of turbulent flow over a rough bed using the immersed boundary method." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34821.

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Study of turbulent flow over a rough bed is highly important due to its numerous applications in the areas of sediment transport and pollutant discharge in streams, rivers and channels. Over the past few decades, many experimental studies have been conducted in this respect to understand the underlying phenomenon. However, there is a scarcity in the number of computational studies conducted on this topic. Therefore, a Large Eddy Simulation (LES) of turbulent flow over a rough channel bed was conducted to contribute further understanding of the influence of bed roughness on turbulent flow prope

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18

Whip, Bo Ryan. "Effect of Process Parameters on the Surface Roughness and Mechanical Performance of Additively Manufactured Alloy 718." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1526993831680976.

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19

Schnur, Christopher. "Electron Beam - Powder Bed Fusion Of Alloy 718 : Influences Of Contour Parameters On Surface And Microstructural Characteristics." Thesis, Högskolan Väst, Avdelningen för Industriell ekonomi, Elektro- och Maskinteknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-14318.

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Additive Manufacturing (AM) is an uprising manufacturing process for parts with complex geometries and low production quantities. Within the layer-wise building process, less additional processes are needed, to produce the parts. This allows a building of parts within a reasonable time- and costs-range. Especially industries, such as aerospace industry, can profit from AM. Electron beam – Powder bed fusion (EB-PBF) is a common technique, within AM, to produce metallic parts out of special alloys such as Alloy 718. This superalloy is a Nickle-Iron based alloy that has high mechanical properties

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20

Balachandramurthi, Arun Ramanathan. "Fatigue Properties of Additively Manufactured Alloy 718." Licentiate thesis, Högskolan Väst, Avdelningen för avverkande och additativa tillverkningsprocesser (AAT), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-13186.

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Additive Manufacturing (AM), commonly known as 3D Printing, is a disruptive modern manufacturing process, in which parts are manufactured in a layer-wise fashion. Among the metal AM processes, Powder Bed Fusion (PBF) technology has opened up a design space that was not formerly accessible with conventional manufacturing processes. It is, now, possible to manufacture complex geometries, such as topology-optimized structures, lattice structures and intricate internal channels, with relative ease. PBF is comprised of Electron Beam Melting (EBM) and Selective Laser Melting (SLM) processes. Though

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21

Cerino, Bastien. "Large-scale flow structures in shallow mixing layers over uniform and spanwise-heterogeneous bed surfaces." Electronic Thesis or Diss., Lyon 1, 2024. http://www.theses.fr/2024LYO10269.

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Ce travail de doctorat examine l’effet de la rugosité du lit sur les couches de mélange peu profondes (SML) et l’évolution des structures cohérentes qui les peuplent, telles que les Structures Cohérentes de Kelvin-Helmholtz (KHCSs), les Courants Secondaires (SCs), les tourbillons de grande ou très grande taille (en anglais, Large ou Very-Large Scale Motions, LSMs et VLSMs respectivement). Deux scénarios de rugosité du lit sont considérés : un lit uniformément rugueux et une transition latérale d’un lit rugueux à un lit lisse. Le lit rugueux est constitué d’un gazon dense artificiel d’une haute

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22

Lindbäck, Katrin. "Hydrology and Bed Topography of the Greenland Ice Sheet : Last known surroundings." Doctoral thesis, Uppsala universitet, Luft-, vatten och landskapslära, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-259076.

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The increased temperatures in the Arctic accelerate the loss of land based ice stored in glaciers. The Greenland Ice Sheet is the largest ice mass in the Northern Hemisphere and holds ~10% of all the freshwater on Earth, equivalent to ~7 metres of global sea level rise. A few decades ago, the mass balance of the Greenland Ice Sheet was poorly known and assumed to have little impact on global sea level rise. The development of regional climate models and remote sensing of the ice sheet during the past decade have revealed a significant mass loss. To monitor how the Greenland Ice Sheet will affe

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23

Wahman, Clarence. "Corrosion of additively manufactured magnesium alloy WE43 : An investigation in microstructure and corrosion properties of as built samples manufactured with Powder Bed Fusion-Laser Beam." Thesis, Uppsala universitet, Tillämpad materialvetenskap, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-448525.

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The work presented in this thesis was conducted at Uppsala University and at Swerim AB. The study aims to broaden the knowledge about the corrosion of additively manufactured bioresorbable alloy WE43 in humanlike conditions for future applications. Biodegradable metal implants are implants meant to stay in the body and support the wounded bone for a certain time period, and then degrade as new, healthy bone forms in its place. Magnesium alloys have properties that are desired for these kind of implants as it is biodegradable, non-toxic and matches the mechanical properties of bone. Furthermore

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24

Evcimen, Taylan Ulas. "The Effect Of Prismatic Roughness Elemnts On Hydraulic Jump." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605792/index.pdf.

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The objective of this study is to determine the effect of different roughness types and arrangements on hydraulic jump characteristics in a rectangular channel. Three different types of roughness were used along experiments. All of them had rectangular prism shapes and that were placed normal to the flow direction. To avoid cavitation, height of roughness elements were arranged according to level of the channel inlet, so that the crests of roughness elements would not be protruding into the flow. The effects of roughness type and arrangement on hydraulic jump properties, i.e. energy dissipati

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25

Masiagutova, Elina. "Étude de la génération des topographies de surfaces latérales issues du procédé LPBF pour un alliage d’aluminium AlSi10Mg." Thesis, Lyon, 2022. http://www.theses.fr/2022LYSEE002.

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Dans le cadre de ce travail, la génération des surfaces produites par le procédé de fusion laser sur lit de poudre LPBF a été étudiée. Le LPBF est un procédé de fabrication additive qui peut conduire à de nouvelles opportunités (fabrication de structures complexes avec canaux internes, structures lattices). Ce procédé attire donc une attention considérable en particulier dans l'industrie aéronautique. Une étude de l’influence des paramètres primaires du procédé LPBF sur la génération des surfaces a été réalisée. Au cours de cette étude, la relation entre la rugosité des surfaces supérieures et

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26

Evcimen, Taylan Ulas. "Effect Of Prismatic Roughness On Hydraulic Jump In Trapezoidal Channels." Phd thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614467/index.pdf.

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A study of the hydraulic jump on a trapezoidal prismatic channel and roughened beds is presented. Extensive measurements have been made regarding the characteristics of hydraulic jumps as sequent depths, wing fluctuations, energy dissipation and jump length on artificially roughened beds for Froude numbers between 4.16 and 14.58. Three different types of prismatic roughness elements and nine different roughness patterns were installed separately on channel bottom and side walls throughout the experiments to obtain rough surfaces. Strip roughness elements were built from fiberglass sheets and i

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27

Haws, Benjamin B. "Ability of ADV Measurements to Detect Turbulence Differences Between Angular and Rounded Gravel Beds of Intermediate - Roughness Scale." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2558.pdf.

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28

CILLI, Silvia. "Evaluation of bedload yield in two small sand-bed rivers of the Ravenna province (Italy)." Doctoral thesis, Università degli studi di Ferrara, 2020. http://hdl.handle.net/11392/2487848.

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Sediment transport, and bedload transport in particular, is one of the most dynamic and complex hydraulic and geomorphologic processes in a river basin. Sediment supply is strictly dependent on erosion processes in the catchment which are highly controlled by primary factors such as: climate, basin area, geology and topography. Sediment transport influences the geomorphic responses of rivers and the equilibrium of the fluvial environment. The sampling devices and techniques used in the field to quantify bedload transport are very few. Difficulties liked to their efficiency, together with the r

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29

Lorentz, Benoît [Verfasser], and A. [Akademischer Betreuer] Albers. "An approach to investigate surface roughness influence on non-lubricated and lubricated contacts by means of the finite element analysis = Ein Ansatz zur Untersuchung der Oberflächenrauheiteinflüsse bei geschmierten und trockenen Kontakten mittels der Finite Elemente Methode [[Elektronische Ressource]] / Benoît Lorentz. Betreuer: A. Albers." Karlsruhe : KIT-Bibliothek, 2013. http://d-nb.info/1049730488/34.

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30

Nunes, Vasco B. "Survey And Statistical Parameterization Of Bed Roughness Of A Coral Reef." Thesis, 2005. http://hdl.handle.net/10125/10531.

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31

Wu, Chi-shou, and 吳啟碩. "The dynamics of intruders differing in surface roughness in a vertical vibrated granular bed." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/11661903960165397163.

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碩士<br>國立中央大學<br>能源工程研究所<br>99<br>This study investigates experimentally the Brazil-nut effect in a quasi-2D vertical vibrated granular bed, the only difference lying in the surface roughness of the larger disks (or called intruders). The so-called “Brazil nut problem” means the larger particle rises to the top of the container and the smaller particles move to the bottom. The dynamics of the larger disk is recorded by using a high speed camera. The effects of vibration conditions and filling height of the granular bed on the dynamics of intruder are investigated in the study. The results show

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32

Zhang, Y., M. Rubinato, E. Kazemi, Jaan H. Pu, Y. Huang, and P. Lin. "Numerical and experimental analysis of shallow turbulent flow over complex roughness beds." 2019. http://hdl.handle.net/10454/17144.

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Yes<br>A set of shallow-water equations (SWEs) based on a k-epsilon Reynold stress model is established to simulate the turbulent flows over a complex roughness bed. The fundamental equations are discretized by the second-order finite-difference method (FDM), in which spatial and temporal discretization are conducted by staggered-grid and leap-frog schemes, respectively. The turbulent model in this study stems from the standard k-epsilon model, but is enhanced by replacing the conventional vertical production with a more rigorous and precise generation derived from the energy spectrum and turb

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33

SINGH, ABHINAV. "STUDY OF THE BEHAVIOUR OF HYDRAULICS JUMP OVER ROUGH HORIZONTAL BED USING DIFFERENT SIZES OF WOODEN BLOCKS." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14662.

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ABSTRACT A hydraulic jump is a phenomenon of hydraulics which is frequently observed in open channel flow such as rivers and spillways. The hydraulic jump depends on the initial fluid speed. If the initial speed of the fluid is below the critical speed, then no jump is possible. This project discusses about the behaviour of hydraulic jump on rough horizontal bed and its implementation in field. In the previous studies various types of roughness were used. For the present study to create roughness on bed by using, different sizes of wooden blocks with different spacing between them are used a

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34

Horoshenkov, Kirill V., Andrew Nichols, Simon J. Tait, and G. A. Maximov. "The pattern of surface waves in a shallow free surface flow." 2013. http://hdl.handle.net/10454/9579.

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Yes<br>This work presents new water surface elevation data including evidence of the spatial correlation of water surface waves generated in shallow water flows over a gravel bed without appreciable bed forms. Careful laboratory experiments have shown that these water surface waves are not well-known gravity or capillary waves but are caused by a different physical phenomenon. In the flow conditions studied, the shear present in shallow flows generates flow structures, which rise and impact on the water-air interface. It is shown that the spatial correlation function observed for these water s

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35

Lacey, Ralph William Jay. "The hydrodynamics associated with instream large roughness elements in gravel-bed rivers = L'hydrodynamique associée aux éléments de rugosité dans les rivières à lit de graviers." Thèse, 2007. http://hdl.handle.net/1866/18281.

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36

Martín, Violeta. "Hydraulic roughness of armoured gravel beds : the role of grain protrusion." Thesis, 2003. http://hdl.handle.net/2429/14800.

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A new theoretical analysis was developed that accounts for variable grain protrusion within self-formed, stable gravel armour layers. A key feature of the analysis is accounting for the variation in drag coefficient, drag force and critical dimensionless shear stress with grain protrusion above the virtual bed, which is defined here as the elevation at which the extrapolated logarithmic velocity profile becomes equal to zero. The central hypothesis is that self-formed stable armour layers develop through adjustment of grain protrusion such that all grains are at the threshold of motion,

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37

Jing, H., C. Li, Yakun Guo, L. Zhu, and Y. Li. "Numerical modeling of flow in continuous bends from Daliushu to Shapotou in Yellow River." 2014. http://hdl.handle.net/10454/10657.

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Yes<br>The upper reach of the Yellow River from Daliushu to Shapotou consists of five bends and has complex topography. A two-dimensional Re-Normalisation Group (RNG) k-ε model was developed to simulate the flow in the reach. In order to take the circulation currents in the bends into account, the momentum equations were improved by adding an additional source term. Comparison of the numerical simulation with field measurements indicates that the improved two-dimensional depth-averaged RNG k-ε model can improve the accuracy of the numerical simulation. A rapid adaptive algorithm was constructe

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38

Grant, Michael. "New modelling and simulation methods to support clean marine propulsion." Thesis, 2021. http://hdl.handle.net/1828/13308.

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The marine industry has increased its adoption of pure-electric, diesel-electric, and other non-traditional propulsion architectures to reduce ship emissions and fuel consumption. While these technologies can improve performance, the design of a propulsion system becomes challenging, given that no single technology is superior across all vessel types. Furthermore, even identical ships with different operating patterns may be better suited to different propulsion technologies. Addressing this problem, previous research has shown that if key elements of a vessel's operational pro file are known,

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