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Dissertations / Theses on the topic 'Cohesive bed'

Author: Grafiati

Published: 22 June 2024

Last updated: 31 July 2025

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1

Shaker, Amjad Hamed. "An investigation of erosion and deposition of fine cohesive sediments." Thesis, University of Southampton, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242460.

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2

Letter, Joseph V. "Significance of probabilistic parameterization in cohesive sediment bed exchange." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0022613.

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3

Ockelford, Anne-Marie. "The impact of stress history on non cohesive sediment bed stability and bed structure." Thesis, University of Glasgow, 2011. http://theses.gla.ac.uk/2577/.

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Historically the inter-flood period has been disregarded from investigations as it was deemed that the stability of non cohesive beds could only be altered by above threshold flows capable of sediment transport. However, this is at odds with more recent ‘stress history’ data which provides unequivocal evidence that entrainment thresholds can be delayed to higher shear stresses after being subjected to longer periods of sub threshold flows. The magnitude of this effect appears related to the surface grain size distribution and relative grain size effects, whilst the specific mechanics associate

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4

Ebisa, Fola Miressa. "Downstream hydraulic geometry of clay-dominated cohesive bed stream channels." Thesis, University of Ottawa (Canada), 2007. http://hdl.handle.net/10393/27838.

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Empirical downstream hydraulic geometry equations for clay-dominated cohesive bed (semi-alluvial) streams were derived using the data from five streams in eastern Ontario and four streams from other regions. The width exponent (0.57) is comparable to the exponents reported for previous studies; however, depth exponent (0.52) was greater for clay-dominated cohesive bed than for typical gravel-bed and sand-bed rivers. Furthermore, the recurrence intervals of bankfull discharges of those streams range from 1 to 2 years. To the author's knowledge, this is the first study which related bankfull hyd

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5

Lintern, David Gwyn. "Influences of flocculation on bed properties for fine-grained cohesive sediment." Thesis, University of Oxford, 2003. http://ora.ox.ac.uk/objects/uuid:f26b7e9d-9de2-4ab0-8090-feef8c3bac9b.

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An understanding of the behaviour of newly deposited soil is important because of its direct applications in fields such as harbour siltation and storage of dredge slurries. In coastal regions the dominant mode for deposition of fine-grained cohesive material is through flocculation- the electrostatic aggregation of mud particles. The present study focuses on the measurement of both flocculation conditions and bed properties, towards the understanding of the influence of the former on the latter. A computerised laboratory setup, complete from sedimentation and flocculation to the long term con

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6

Llull, Marroig Antoni Ignaci. "Ship propeller induced scour of non-cohesive sediment in low bed-clearance conditions." Doctoral thesis, Universitat Politècnica de Catalunya, 2022. http://hdl.handle.net/10803/673563.

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Ships maneuvering in low bed clearance conditions induce sediment scour due to the high speed jet generated by a rotating propeller. Sediment scour is known to cause instability to quay structures, damage to the bed protection and may create huge accretion areas reaching extremely low depths, preventing the free passage of large ships. This on-going problem is linked to the constant increase in commercial ship sizes and is widely recognized in current harbor management guidelines. This thesis presents in the first place the experimental work carried out to study the effects of two common pr

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7

Mooneyham, Christian David. "Interaction of Clay Wash Load With Gravel Beds." Thesis, Virginia Tech, 2017. http://hdl.handle.net/10919/84547.

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This study focuses on the interaction of wash load particles with gravel bed rivers. The effects of excess fine sediment loading to streams on general water quality, contaminant transport, and benthic organism mortality has been well examined. A fundamental assumption in fluvial geomorphology and river engineering is that wash load particles ($d<63mu m$) do not deposit to stream beds, but are instead transported downstream until they deposit in reservoirs or estuaries. The goal of this study is to determine if wash load sized particles can deposit to gravel beds, where within the bed substr

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8

Harsanto, Puji. "Erosion Characteristics of Cohesive Sediment Bed and Bank, and Their Effects on River Morphology." 京都大学 (Kyoto University), 2012. http://hdl.handle.net/2433/160989.

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9

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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10

Rangel, Roberto Carlos. "Evolution of a non-cohesive granular bed subject to a succession of erosive turbidity currents." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/36712.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, June 2006.<br>Includes bibliographical references (leaf 18).<br>An experiment was performed to study the evolution of a non-cohesive granular bed subject to a succession of erosive turbidity currents to evaluate the applicability of a proposed interface model that prescribes a relationship between the bed shear stress and the local bed elevation and local bed slope. This study considered only the relationship between the local bed elevation and the shear stress by using non-cohesive plastic particles as bed

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11

Patterson, Shelley M. "The effects of ballistic impact of littorinid shells on the erosion of a cohesive clay bed." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ58430.pdf.

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12

Papenmeier, Svenja [Verfasser]. "Properties and dynamics of suspended load and near-bed fine cohesive sediments in highly impacted estuaries. Case studies from the Weser, Ems and Elbe estuaries (Germany) / Svenja Papenmeier." Kiel : Universitätsbibliothek Kiel, 2012. http://d-nb.info/1029457085/34.

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13

Ralaiarisoa, Velotiana Jean-Luc. "Influence de la cohésion sur le transport éolien de particules : application au sable humide et à la neige." Thesis, Rennes 1, 2020. http://www.theses.fr/2020REN1S065.

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Cette thèse porte sur la caractérisation du transport sur un lit granulaire cohésif en considérant le cas du sable et de la neige. Une approche numérique pour étudier le processus de l'érosion par impact sur un empilement cohésif a permis de quantifier l'effet de la cohésion sur le processus Splash. Pour quantifier l'effet de la cohésion le transport de particules par un écoulement d'air, nous avons choisi une approche expérimentale en soufflerie. L'étude du transport sur un lit de sable sec a permis de caractériser la transition du régime de saltation vers un régime collisionnel lorsque le no

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14

Zaidan, Jana. "Scοur investigatiοn arοund a bridge pier fοunded in cοhesive sοil". Electronic Thesis or Diss., Normandie, 2023. http://www.theses.fr/2023NORMLH22.

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L’affouillement local autour des piles est considéré comme un des principaux risques de rupture et d’effondrement des ponts. Les expériences en laboratoire sont un élément crucial de l’étude du processus d’affouillement. Pourtant, il n’existe pas d’instrument robuste et standard pour suivre l’évolution de ce phénomène physique dans les études de laboratoire. Les études expérimentales en canal sur l’affouillement autour d’une pile circulaire dans un sol non cohésif sont nombreuses. Cependant, le lit des canaux alluviaux naturels contient souvent des sédiments cohésifs. Comparativement, il exist

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15

COLETTO, MAURICIO MIGUEL. "Atmospheric Freeze Drying of Food in Fluidized Beds - Practical aspects and CFD simulation." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2588248.

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Atmospheric freeze drying (AFD) is the lyophilization of a product at atmospheric pressure conditions and temperatures ranging generally between -15 and -5 ◦C (avoiding, thereby, ice melting). The quality of the obtained dried products is quite similar to the quality of products dried by vacuum freeze drying (VFD), but without the need of generating vacuum, maintaining temperatures around -50 ◦C in the condenser, or defrosting it. There are several ways to carry out AFD, such as the use of a fluidized bed or a tunnel conveyor. Nevertheless, AFD involves considerably longer drying times than V

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16

Israel, Devadason Benjamin Praisy. "Contraction scour in compound channels with cohesive soil beds." Texas A&M University, 2007. http://hdl.handle.net/1969.1/85810.

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Bridge scour, which is the removal of bed materials from near the bridge foundations, is observed to be the most predominant cause of bridge failures in the United States. Scour in cohesive soils is greatly different from scour in cohesionless soils owing to the differences in critical shear stresses, scour extents and the time taken to reach the maximum scour depth in the scour process. The present solutions available for the cohesionless soils cannot be applied to cohesive soils because of the above crucial reasons. Also, a compound channel model with main channel and flood plain arrangement

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17

Putta, Sriram. "Elastodynamic Numerical Characterization of Adhesive Interfaces Using Spring and Cohesive Zone Models." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu156338398610629.

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18

Skipworth, Peter John. "The erosion and transport of cohesive-like sediment beds in sewers." Thesis, University of Sheffield, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245698.

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19

Yin, Daowei. "Genesis and evolution of bedforms on cohesive mud beds and simulated bedrock channels." Thesis, University of Leeds, 2013. http://etheses.whiterose.ac.uk/6358/.

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Most previous studies on the genesis and evolution of bedforms have focused on aggradational bedforms within cohesionless sediments, with very few investigations that concern either erosive bedform genesis and evolution or bedrock channel abrasion processes. The study presented here details experiments that involve the genesis and formation of erosional bedform features within natural (soft clay) cohesive sediment beds and analogue bedrock substrates by modelling clay under the effect of both open-channel plain water flows, and sediment-laden flows. A new approach without using plaster-of-Pari

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20

Schumacher, Martin Robert [Verfasser], and Andrei [Akademischer Betreuer] Lupas. "Cohesin-assoziierte Proteine und ihre Funktion bei der Schwesterchromatid-Kohäsion / Martin Robert Schumacher ; Betreuer: Andrei Lupas." Tübingen : Universitätsbibliothek Tübingen, 2012. http://d-nb.info/1162843616/34.

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21

Braziulytė, Asta. "Karių, dalyvavusių tarptautinėje misijoje Afganistane, potrauminio streso sąsajos su patiriamais stresogeniniais įvykiais bei subjektyviai vertinamu grupės sutelktumu." Master's thesis, Lithuanian Academic Libraries Network (LABT), 2009. http://vddb.library.lt/obj/LT-eLABa-0001:E.02~2009~D_20091222_104451-94115.

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Siekiant nustatyti iš misijos Afganistane grįžusių karių psichologinę būklę, patiriamus stresogeninius įvykius, kokios stresinės situacijos įtakoja potrauminio streso pasireiškimą, šiame darbe analizuojami jų patirti stresogeniniai įvykiai, potrauminio streso išsivystymas bei grupės sutelktumas. „Karių patiriamo streso klausimynas“, Potrauminio streso Misisipės skalė“, „Grupės sutelktumo“ klausimynais. Apklausta 111 iš misijos Afganistane grįžusių karių. Rezultatai parodė, kad kariams, patyrusiems daugiau stresogeninių įvykių bei blogiau vertinantiems grupės sutelktumą, yra labiau išreikšti po

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22

Raghavan, Sathyanarayanan. "Experimental and theoretical study of on-chip back-end-of-line (BEOL) stack fracture during flip-chip reflow assembly." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/54298.

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With continued feature size reduction in microelectronics and with more than a billion transistors on a single integrated circuit (IC), on-chip interconnection has become a challenge in terms of processing-, electrical-, thermal-, and mechanical perspective. Today’s high-performance ICs have on-chip back-end-of-line (BEOL) layers that consist of copper traces and vias interspersed with low-k dielectric materials. These layers have thicknesses in the range of 100 nm near the transistors and 1000 nm away from the transistors close to the solder bumps. In such BEOL layered stacks, cracking a

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23

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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24

Yang, Shie-Chen, and 楊士震. "Dynamic Behavior of Cohesive Granular Materials in a Vibrated Bed." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/96227848453209178607.

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博士<br>國立中央大學<br>機械工程研究所<br>89<br>This thesis examines the dynamic behaviors of granular materials subjected to external vertical vibration. The cohesionless and cohesive materials are considered in this thesis. Two-dimensional discrete element computer simulation is used to study the flow behaviors, self-diffusion and mixing of vibration granular flows. Experiment was also performed to supplement the simulation results of the current study. The flow behaviors of convection cells of cohesionless materials under vertical vibration are first investigated by simulation. The flow pattern

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25

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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26

Galvagno, Giampiero. "A study of scour below Ruskin Dam spillway using a non-cohesive bed hydraulic model." Thesis, 1998. http://hdl.handle.net/2429/7672.

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Hydraulic models, using either cohesive or non-cohesive beds, have traditionally been employed to gauge scour below a spillway. Empirical equations, based on world-wide prototype and model experience, have been developed for estimating scour depth depth. In this study both the hydraulic modelling and analytical approach were used to assess the maximum potential scour in the rock lined channel below Ruskin Dam. Ruskin Dam, built in 1928, has an overflow spillway with seven bays discharging into a rock-lined channel. The spillway has a complex arrangement of concrete benches lining the si

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27

Morozowa, Julia. "Adhäsionsentstehung, Adhäsionsprophylaxe bei Myomektomien (mit 2 prospektiv randomisierten Studien Adhibit (Cohesion) und Spraygel (Confluent)." 2005. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=014907413&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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28

Rodrigues, Bárbara da Costa Carlos de Almeida. "Liderança, coesão e desempenho e bem-estar das equipas desportivas." Master's thesis, 2019. http://hdl.handle.net/10400.12/7297.

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Dissertação de Mestrado apresentada no ISPA – Instituto Universitário de Ciências Psicológicas, Sociais e da Vida, para obtenção do grau de Mestre na especialidade de Psicologia Social e das Organizações<br>O presente estudo tem como objetivo principal compreender se a liderança do treinador tem influência no desempenho e bem-estar da equipa, e ainda compreender se essa relação é mediada pela coesão. A amostra é constituída por 110 jogadores de futebol e rugby, em que 90 pertenciam ao sexo masculino e 20 ao sexo feminino, com idades compreendidas entre os 14 e superior ou igual a 25 anos (M=1

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29

Santos, Rita Menezes dos. "Exigências laborais associadas ao stress profissional e bem-estar laboral: O papel moderador da coesão grupal percebida." Master's thesis, 2010. http://hdl.handle.net/10071/4996.

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O mundo organizacional está em permanente mudança, quer devido à globalização, ao aumento da concorrência, às crises económicas que se sucedem, o que faz com que as organizações e os seus colaboradores estejam sujeitos a exigências extremas. É neste sentido que ganham cada vez mais pertinência estudos no âmbito do stress e bemestar no trabalho, sendo que o presente estudo propõe-se a analisar a relação entre as exigências laborais e o stress profissional percebido e o bem-estar psicológico, assim como verificar o papel moderador que a coesão grupal percebida possui na relação entre exigê

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