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Academic literature on the topic 'Sedimentation modes'

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Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Sedimentation modes"

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Hernando, Louis, Aziz Omari, and David Reungoat. "Experimental study of sedimentation of concentrated mono-disperse suspensions: Determination of sedimentation modes." Powder Technology 258 (May 2014): 265–71. http://dx.doi.org/10.1016/j.powtec.2014.03.037.

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XIA, ZHENHUA, KEVIN W. CONNINGTON, SAIKIRAN RAPAKA, PENGTAO YUE, JAMES J. FENG, and SHIYI CHEN. "Flow patterns in the sedimentation of an elliptical particle." Journal of Fluid Mechanics 625 (April 14, 2009): 249–72. http://dx.doi.org/10.1017/s0022112008005521.

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We study the dynamics of a single two-dimensional elliptical particle sedimenting in a Newtonian fluid using numerical simulations. The main emphasis in this work is to study the effect of boundaries on the flow patterns observed during sedimentation. The simulations were performed using a multi-block lattice Boltzmann method as well as a finite-element technique and the results are shown to be consistent. We have conducted a detailed study on the effects of density ratio, aspect ratio and the channel blockage ratio on the flow patterns during sedimentation. As the channel blockage ratio is varied, our results show that there are five distinct modes of sedimentation: oscillating, tumbling along the wall, vertical sedimentation, horizontal sedimentation and an inclined mode where the particle sediments with a non-trivial orientation to the vertical. The inclined mode is shown to form a smooth bridge between the vertical and horizontal modes of sedimentation. For narrow channels, the mode of sedimentation is found to be sensitively dependent on the initial orientation of the particle. We present a phase diagram showing the transitions between the various modes of sedimentation with changing blockage ratio of the channel.
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Gubaidullin, Damir, Rinat Zaripov, and Liudmila Tkachenko. "Dynamics of nonlinear waves in the tubes filled with aerosol." MATEC Web of Conferences 148 (2018): 01002. http://dx.doi.org/10.1051/matecconf/201814801002.

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The results of experimental investigations of nonlinear oscillations of finely dispersed aerosol in the tube with various geometry on the end in the shock-wave, the shock-free wave modes and in the mode of transition to shock waves near the resonance frequency are presented. The time dependences of the numerical concentration of the oscillating aerosol droplets are presented. The effect of the frequency and amplitude of the piston displacement and the influence of the diaphragm internal diameter on the time coagulation and sedimentation of aerosol were studied. An increase in the amplitude of the piston displacement in all modes results in acceleration of the process of coagulation and sedimentation of aerosol. The dependence of time of coagulation and sedimentation of aerosol on the excitation frequency was found to be of a nonmonotonic character with the minimum value upon the resonance frequency.
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Shen, Liang, Han Xiao, Wan Qiu Yang, De Ren Miao, and Xiao Ming Li. "Study on Biological Aerated Filter as Enhanced Pretreatment Process of Coagulation and Sedimentation." Advanced Materials Research 726-731 (August 2013): 1940–44. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.1940.

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Using coagulation and sedimentation process in the advanced treatment of urban secondary effluent which can be recycled to circulating cooling water system in power plant is only perform well on CODCrand turbidity removal. But the concentrations of organic matter and NH3in effluent can not meet the requirements of circulating cooling water. Therefore, in this study, the feasibility of biological aerated filter (BAF) as a pretreatment enhancing coagulation and sedimentation process was discussed. Achieved by controlling the two operating modes: (1) secondary effluentcoagulation and sedimentationeffluent; (2) secondary effluent BAFcoagulation and sedimentation effluent.The results show that the BAF pretreatment removes ammonia nitrogen effectively, and the turbidity and CODCrof effluent of BAF-coagulation sedimentation process is much lower than individual coagulation and sedimentation process. The final effluent qualities meet the requirements of circulating cooling water system in power plant.
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Minelli, Caterina, Aneta Sikora, Raul Garcia-Diez, Katia Sparnacci, Christian Gollwitzer, Michael Krumrey, and Alex G. Shard. "Measuring the size and density of nanoparticles by centrifugal sedimentation and flotation." Analytical Methods 10, no. 15 (2018): 1725–32. http://dx.doi.org/10.1039/c8ay00237a.

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Dietze, E., F. Maussion, M. Ahlborn, B. Diekmann, K. Hartmann, K. Henkel, T. Kasper, G. Lockot, S. Opitz, and T. Haberzettl. "Sediment transport processes across the Tibetan Plateau inferred from robust grain size end-members in lake sediments." Climate of the Past Discussions 9, no. 4 (August 21, 2013): 4855–92. http://dx.doi.org/10.5194/cpd-9-4855-2013.

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Abstract. Grain size distributions offer powerful proxies of past environmental conditions that are related to sediment sorting processes. However, they are often of multimodal character because sediments can get mixed during deposition. To facilitate the use of grain size as palaeoenvironmental proxy this study aims to distinguish the main detrital processes that contribute to lacustrine sedimentation across the Tibetan Plateau using grain size end-member modelling analysis. Between three and five robust grain size end-member subpopulations were distinguished at different sites from similarly-likely end-member model runs. Their main modes were grouped and linked to sediment transport and depositional processes associated with certain climatic background and catchment configurations. The coarse sands and clays with grain size modes > 250 μm and < 2 μm were probably transported by fluvial processes. Aeolian sands (~ 200 μm) and coarse local dust (~ 60 μm), transported by saltation and in near-surface suspension clouds, are probably related to occasional westerly storms in winter and spring. Coarse regional dust with modes ~ 25 μm may derive from near-by sources that keep in longer-term suspension. The continuous background dust is differentiated into two robust end-members (modes: 5–10 and 2–5 μm) that may represent different sources, wind directions and/or sediment trapping dynamics from long-range, upper-level westerly and episodic northerly wind transport. According to this study grain size end-members of only fluvial origin contribute small amounts to mean Tibetan lake sedimentation (19 ± 5%), whereas local to regional aeolian transport and background dust deposition dominate the clastic sedimentation in Tibetan lakes (contributions: 42 ± 14% and 51 ± 11%). However, fluvial and alluvial reworking of aeolian material from nearby slopes during summer seems to limit end-member interpretation and should be crosschecked with other proxy information. If not considered as a stand-alone proxy, a high transferability to other regions and sediment archives allows helpful reconstructions of past sedimentation history.
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Dietze, E., F. Maussion, M. Ahlborn, B. Diekmann, K. Hartmann, K. Henkel, T. Kasper, G. Lockot, S. Opitz, and T. Haberzettl. "Sediment transport processes across the Tibetan Plateau inferred from robust grain-size end members in lake sediments." Climate of the Past 10, no. 1 (January 16, 2014): 91–106. http://dx.doi.org/10.5194/cp-10-91-2014.

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Abstract. Grain-size distributions offer powerful proxies of past environmental conditions that are related to sediment sorting processes. However, they are often of multimodal character because sediments can get mixed during deposition. To facilitate the use of grain size as palaeoenvironmental proxy, this study aims to distinguish the main detrital processes that contribute to lacustrine sedimentation across the Tibetan Plateau using grain-size end-member modelling analysis. Between three and five robust grain-size end-member subpopulations were distinguished at different sites from similarly–likely end-member model runs. Their main modes were grouped and linked to common sediment transport and depositional processes that can be associated with contemporary Tibetan climate (precipitation patterns and lake ice phenology, gridded wind and shear stress data from the High Asia Reanalysis) and local catchment configurations. The coarse sands and clays with grain-size modes >250 μm and <2 μm were probably transported by fluvial processes. Aeolian sands (~200 μm) and coarse local dust (~60 μm), transported by saltation and in near-surface suspension clouds, are probably related to occasional westerly storms in winter and spring. Coarse regional dust with modes ~25 μm may derive from near-by sources that keep in longer term suspension. The continuous background dust is differentiated into two robust end members (modes: 5–10 and 2–5 μm) that may represent different sources, wind directions and/or sediment trapping dynamics from long-range, upper-level westerly and episodic northerly wind transport. According to this study grain-size end members of only fluvial origin contribute small amounts to mean Tibetan lake sedimentation (19± 5%), whereas local to regional aeolian transport and background dust deposition dominate the clastic sedimentation in Tibetan lakes (contributions: 42 ± 14% and 51 ± 11%). However, fluvial and alluvial reworking of aeolian material from nearby slopes during summer seems to limit end-member interpretation and should be crosschecked with other proxy information. If not considered as a stand-alone proxy, a high transferability to other regions and sediment archives allows helpful reconstructions of past sedimentation history.
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Teťák, František. "The gravity flow dynamics of submarine fan sedimentation in the Magura Basin of the Western Carpathians (Magura Nappe, Slovakia)." Geologica Carpathica 61, no. 3 (June 1, 2010): 201–9. http://dx.doi.org/10.2478/v10096-010-0011-6.

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The gravity flow dynamics of submarine fan sedimentation in the Magura Basin of the Western Carpathians (Magura Nappe, Slovakia)This article deals with the dynamics of the deep-water gravity flows sedimentation within the Magura Formation. This investigation is based on analysis of the Magura sandstone sedimentary structures studied on the outcrops. The final comparison of the sedimentary structures and cycles with the paleocurrent directions provided an interpretation of the gravity flows dynamics and helped to restore the migration of the sandy lobes in space and time. Three modes of sedimentation are recorded: regular cyclic sedimentation from the lobe, irregular sedimentation from the immature lobe and pelitic sedimentation on the basin plane without the lobe influence. We compared the occurrence of some sedimentary structures with the changes of the current directions and bed thickness. The following interpretations of gravity flow fan dynamics are results of this comparision: the fan consists of one or several lobes, the lobe branches out into branches with the radial current arrangement, the lobes laterally change position and the lobes suddenly die out.
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V. I. Donenko, O. M. Nazarenko, I. A. Nazarenko, M. P. Marchenko, and V. P. Sulima. "Technical advantages of the city sedimentation water reconstruction system." Ways to Improve Construction Efficiency, no. 45 (October 16, 2020): 26–36. http://dx.doi.org/10.32347/2707-501x.2020.45.26-36.

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The work designs a system of production components of urban infrastructure to create an energy efficient city. Hydraulic, hydrological, heat exchange processes of interaction of water structure and elements of treatment structures for centrifugal deposition of suspended matter have been investigated. Depending on the degree of contamination, devices for resource recovery are calculated. The duration of recovery operations was investigated. The technological cycle of re-water recovery and the number of cycles of cavitation generator for controlled conditioning of conditionally clean and dirty waters have been determined. Reverse osmosis devices for the recovery of conditionally pure water have been investigated. Categorized potential effluents of industrial waters as appropriate for restoration. Samples of experimental sediments for the needs of the construction industry at operating and supercritical modes of operation of the technological stream were obtained. A mathematical model of the productivity of irrigation of agro-centers in drought conditions with drip irrigation by repeated water has been developed.
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Kidwell, Susan M. "Models for fossil concentrations: paleobiologic implications." Paleobiology 12, no. 1 (1986): 6–24. http://dx.doi.org/10.1017/s0094837300002943.

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Four basic types of skeletal concentrations are modeled in terms of changes in sedimentation rate alone. The model categorizes fossil concentrations on the relatively objective basis of their bed contacts, and uses this criterion to infer directional shifts in net sedimentation. This radical simplification of accumulation histories, in which hardpart input is held constant, yields a surprisingly powerful model capable of predicting a broad spectrum of taphonomic and paleobiologic phenomena. Type I concentrations grade from less fossiliferous sediments and terminate in omission surfaces; if hardpart supply is held constant, they record a slowdown from positive to zero net sedimentation. Type II concentrations are the same as Type I but terminate in erosion surfaces (slowdown to negative net sedimentation), and Type III and IV concentrations are characterized by basal erosion or omission surfaces, respectively, grade upward into less fossiliferous sediments, and record increases in net sedimentation from negative or zero rates to positive rates. According to the model, samples collected from successive horizons within any of these shell beds will differ in the degree and type of post-mortem bias owing to differing histories of hardpart exposure at the depositional interface. Moreover, because rates of sediment accumulation govern the abundance of hardparts at the depositional interface and thus many of the physical characteristics of the benthic habitat, the dynamics of fossil accumulation have direct consequences for the structure of benthic communities (taphonomic feedback) and for ecologically controlled species morphometry.The model is highly robust to fluctuations in hardpart input, as judged by its ability to correctly infer modes of formation of concentrations in synthetic stratigraphic sections. In addition, field examples of Type I–IV concentrations show independent evidence of formation during intervals of reduced net sedimentation, and many exhibit trends in taphonomic and paleobiologic features expected from the postulated changes in net sedimentation. The model thus provides a testable working hypothesis for the accumulation of fossil material in a wide range of environments, and should be applicable to concentrations of any taxonomic composition, state of preservation, or geologic age. The power and robustness of this heuristic model in fact argue that fossil-rich and fossil-poor strata provide fundamentally different records of past conditions, and that sedimentation rather than hardpart input is the primary control on the nature of the fossil record.
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Dissertations / Theses on the topic "Sedimentation modes"

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Kurt, Nilufer, and nilf_k@yahoo com au. "A Study of Channelling Behaviour in Batch Sedimentation." RMIT University. School of Civil and Chemical Engineering, 2006. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20061220.120258.

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Batch sedimentation is a method that enables us to understand the mechanism of compaction and compression of sedimenting slurry. However, batch settling behaviour is a very complex phenomenon that is not easily described fully by a mathematical model. This causes unrealistically large empirical calculations when the thickener size estimations are required. Channelling, reverse concentration gradients and the initial concentration of the slurry have large effects on batch settling. Existing procedures do not provide clear relationships involving these three significant variables. In this study, batch sedimentation phenomena are examined in detail and possible explanations are given to clarify the complex behaviour using recent theories. Modern research has shown that channelling is an unwanted formation because channels can change the concentration at the bottom and top of the bed by carrying a great amount of flocs upwards. Batch sedimentation tests were performed using flocculated slurry of Calcium Carbonate at various initial concentrations such as 250 g/l, 500 g/l, 750 g/l and 1000 g/l to observe channelling and reverse concentration gradients. Flux plots for the batch system reveal behaviour which can be attributed to the upward flow of solids. In addition, photographic methods were used to observe settling processes, channelling mechanisms and flocs in the channels. One of the purposes of this work was to examine the phenomenological solid-liquid separation theory of Buscall and White (1987), which employs the material properties of the local volume fraction, compressive yield stress Py ()ö and hindered settling function R()ö to identify the material behaviour in batch sedimentation. Stepped-pressure filtration and batch settling tests were used to measure the material characteristics for the flocculated CaCO3 suspension. Experimental data were demonstrated using Height versus Time and Height versus Concentration graphs and displayed the possible region of reverse concentration gradients and channelling in the settling bed. Mathematical predictions adopted from Usher (2002) were performed employing material characteristics of the material and graphical documentations were presented. The results of mathematical predictions were compared to the experimental results and the modes of sedimentation explained by Lester et al. (2005). Fundamental theoretical models and experimental observations highlight that the main driving force for channelling is the high-pressure gradient at the bottom of the bed and the most important factors that cause channelling are high initial concentration of slurry and settling time. The predictions also show that the material and flocculant used for the batch settling tests demonstrate important effect on the settling process. The knowledge and information gained from this study is valuable to maximize the thickening process.
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Hernando, Louis. "Sédimentation de suspensions non-colloïdales poly-dispersés et concentrées." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14490/document.

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De la pâte à dentifrice au moût de fermentation en passant par la peinture, le lit d’une rivière, le propergol d’un réacteur de fusée et le sang, les suspensions sont présentes dans de nombreux usages de notre vie courante. La maîtrise de leur mise en œuvre notamment nécessite la compréhension de leur comportement et constitue un des challenges de la recherche. Dans le présent travail de thèse, nous nous sommes intéressés au processus de sédimentation de suspensions concentrées de particules non-colloïdales et inertes dont la distribution de taille est mono, bi ou tri-disperse. Deux types de sédimentation ont été étudiés : la décantation et l’alimentation continue. L’objectif est de mener une étude expérimentale et dans une moindre mesure numérique pour caractériser de la façon la plus complète possible la sédimentation avec une attention particulière à la structure de l’écoulement et du dépôt, aux profils de concentration et à la détermination des modes de sédimentation. Les moyens expérimentaux utilisés sont les techniques usuelles de mesure bidimensionnelle (vélocimétrie laser et visualisation directe) qui autorisent l’acquisition de données d’intérêt pour des configurations où les particules évoluent dans le plan. Ces techniques laser ont été améliorées pour permettre le suivi simultané de populations de différentes particules et l’accès à des grandeurs diverses telles que le champ de vitesse de l’écoulement, la fraction volumique locale, et les vitesses des divers fronts de sédimentation. En parallèle, un outil numérique simple a été construit, utilisant la Dynamique Stokesienne et saisissant l’essentiel des phénomènes physiques mis en jeu menant à la modélisation des interactions hydrodynamiques
From toothpaste to must of fermentation passing by painting, bed of a river, propellant of an rocket engine and blood, suspensions are present in many uses of our everyday life. The control of their implementation requires comprehension of their behavior and constitutes one of the challenges of nowadays research. In this work of thesis, we were interested in the sedimentation process of concentrated suspensions of non-colloidal and inert particles whose size distribution is mono, bi or tri-disperse. Two types of sedimentation were studied: decantation and thickening. The objective is to do an experimental and in a lesser way numerical study to characterize sedimentation the most completly possible with a detailed attention to flow and deposit structure, concentration profiles and determination of sedimentation modes. Used experimental means are the usual techniques of two-dimensional measurement (laser velocimetry and direct visualization) which authorize the data acquisition for configurations where particles evolve in the plan. These laser techniques were improved to simultaneously follow various particles populations and access to various outpouts such as velocities field, local volumic fraction, and velocities of various sedimentation fronts. A simple numerical tool was also built using Stokesian Dynamics and seizing the main part of the physical phenomena driving sedimentation leading to the modeling of the hydrodynamic interactions
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Campos, Rogério. "Three-dimensional reservoir sedimentation model." Thesis, University of Newcastle Upon Tyne, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.421172.

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Karl, Joanna Robin. "Gravity Sedimentation: A One-Dimensional Numerical Model." PDXScholar, 1993. https://pdxscholar.library.pdx.edu/open_access_etds/4594.

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A large fraction of the current cost of wastewater treatment is from the treatment and disposal of wastewater sludge. Improved design, energy efficiency, and performance of dewatering facilities could significantly decrease transport and disposal costs. Dewatering facilities are designed based on field experience, trial and error, pilot plant testing, and/or full scale testing. Design is generally time-consuming and expensive. A full-scale test typically consists_ of side-by-side operation of 4 to 5 full-scale dewatering units for several weeks to more than 6 months. Theoretical modeling of the physics of dewatering units such as the belt filter press, based on laboratory determined sludge properties, would better predict dewatering performance. This research developed a numerical computer model of the physics of gravity sedimentation. The model simulated the gravity sedimentation portion of the belt filter press. The model was developed from a physically-based numerical computer model of cake filtration by Wells (1990). As opposed to the cake filtration model, the inertial and gravity terms were retained in the gravity sedimentation model. Although in the cake filtration model, the inertial terms were shown to be negligible, according to Dixon, Souter, and Buchanan (1985), inertial effects in gravity sedimentation cannot generally be ignored. The region where inertia is important is the narrow interface between suspension and sediment. In the cake filtration model the gravity term was negligible due to the relatively large magnitude of the applied pressure; but in the gravity sedimentation model, since there was no applied pressure, it was necessary to consider the effect of gravity. _ Two final governing equations were developed - solid continuity and total momentum with continuity ("momentum"). ·The finite difference equations used a "space-staggered" mesh. The solid continuity equation was solved using an explicit formulation, with a forward difference in time and central difference in space. The "momentum" equation used a fully implicit formulation with a forward difference in time. The modeler could choose either a central difference or forward difference in space. Non-linear terms were linearized. Boundary Conditions and constitutive relationships were determined. Numerical errors in the numerical model were analyzed. The model was calibrated to known data and verified with additional data. The model was extremely sensitive to the constitutive relationships used, but relatively unaffected by the At or the use of central difference or forward difference for the spatial derivative term in the "momentum" equation. Correlations of the calibrated model to data with a low initial concentration show that the constitutive parameters approximate the data, but not very well. Model runs with low initial concentration required the addition of artificial viscosity to remain stable. The gravity term was always significant, whereas the inertial terms were many orders of magnitude less than gravity. However, the lower the initial concentration, the larger the inertial terms. In addition to the belt filter press, the model can also be applied to cake filtration and design of gravity sedimentation tanks as well.
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Volentik, Alain C. M. "Tephra transport, sedimentation and hazards." [Tampa, Fla] : University of South Florida, 2009. http://purl.fcla.edu/usf/dc/et/SFE0002949.

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Carmona, Bardella Ana. "Combining Discrete Element and Process-based sedimentary models: a new tool to model syntectonic sedimentation." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/401652.

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In order to understand the current state of the natural rocky environment and its heterogeneity, we require to study the interaction and time evolution of the numerous geological processes that have contributed to the geological reality we observe today. Given this, the thesis presented here concerns itself with numerical modelling of geological processes. The forward numerical model developed during this thesis is able to simulate deformation and sedimentation in one single setting. To do this, the model uses a novel approach that combines a Discrete Element Model (DEM) and a process- based sedimentary model, Simsafadim (SFM) to link both processes, deformation and sedimentation. The discrete element model (DEM) deals with the simulation of deformation in different materials in 2D and 3D. It is primarily used to investigate the propagation and evolution of deformation in the upper crust caused by tectonic movements. Simsafadim (SFM) is a process-based numerical forward model, which simulates subaqueous clastic transport and sedimentation in three dimensions, including processes of carbonate interaction, production, transport and sedimentation. It can model efficiently the distribution of facies and the depositional architectures in a sedimentary basin and it is a powerful tool for the 3D prediction of stratigraphic structures. Merging both codes provides a new tool for geological modelling in which deformation is influenced by the presence of syntectonic sediment dispersal and deposition. In addition, the tectonic processes change the topographic surface, which influences fluid flow, transport and, consequently, sedimentation in the process-based sedimentary model. The interaction of tectonic and sedimentary processes allows us to study the propagation of deformation in the syntectonic materials as well as how these new sediments influence the propagation of deformation in the pretectonic unit. The model is applied in two different cases studies, in order to test the viability of the new model, as well as to achieve new insight in the respective themes treated: 1) First case study: the effect of normal faulting and a relay ramp on sediment dispersal. The model is used to study the sedimentary infill in an extensional basin, specifically related to a relay ramp system. To perform the test study two configurations are designed: with one normal fault, and with two overlapping normal faults linked by a relay ramp. The different results show that the source area location in relation to the available accommodation space plays the major role in the distribution of different sediment types into the basin. Nonetheless, when the source area for water and sediment is defined as regional and parallel to the fault, the grain size distribution obtained by the two overlapping faults linked by a relay ramp have clear asymmetries when compared with the ones obtained by one-fault configurations. Therefore, the different extensional experiments allow us to conclude that the configuration with a relay ramp can play an important role in the distribution of the sediments into the basin. 2) Second case study: The effect of syntectonic sedimentation on fold geometry The numerical is used to investigate the effect of syntectonic sedimentation on fold geometry and specifically related to a delta progradation surrounded by two growing anticlines. To the initial tectonic configuration that reproduces the growth of two faults, two different cases of the sedimentary model are considered: without sediments, and considering syntectonic sedimentation. Summing up, the main results obtained for these experiments conclude that the syntectonic sedimentation is controlling the mechanism of fold growth and the final fold geometry: the left-side fold shows a left-vergent asymmetric anticline. Moreover, the strain suggests that this anticline is passing from a detachment fold (without sediments) to a fault propagation fold basinwards (with sediments). As a consequence, the inner syncline and the related sedimentary basin are also changing in transversal and longitudinal direction, being wider with syntectonic sedimentation.
El objectiu principal d'aquesta tesi és donar un pas endavant en el coneixement dels processos geològics que intervenen en la formació de les conques sedimentàries mitjançant la creació d'un model numèric per modelitzar la sedimentació sintectònica en un ambient subaquàtic. El model numèric desenvolupat en aquesta tesi és capaç de modelitzar la sedimentació clàstica subaquàtica i la deformació de la unitat pretectònica en una sola configuració. Per fer això, el model combina dos models ja existents: un model d'elements discrets per simular la deformació de la unitat pretectònica (DEM) i un model sedimentari basat en processos, per modelitzar la sedimentació clàstica subaquàtica Simsafadim (SFM). La unió d'aquest dos models, DEM i SFM, proporciona una nova eina per a la modelització geològica. En el nou model, l’evolució de deformació en la unitat pretectònica canviarà la topografia de la conca, que afectarà directament la batimetria, influenciant així els processos de transport i sedimentació que hi tenen lloc. Alhora, aquesta evolució de la deformació de la unitat pretectònica estarà influenciada per la presència dels nous materials sintectònics. Amb aquesta doble interacció tectònica-sedimentària del nou model, també es pot estudiar la deformació en els materials sintectònics. Aquesta nova eina de modelització permet simular i analitzar diferents arquitectures deposicionals sintectòniques i escenaris geològics més complexos. Tant per ampliar el coneixement de com els processos de sedimentació-deformació interactuen en alguns ambients tectònics, com per comprovar l'eficàcia del model, la nova eina s'aplica a dos casos diferents: 1) En primer lloc s'utilitza el model numèric en un ambient extensional per estudiar l'impacte que té la presència de falles normals i les corresponents zones de relleu en la distribució del sediment a la conca. Quan es compara la distribució de sediment obtinguda amb una configuració de dos falles amb una rapa de relleu, amb la distribució de sediment obtinguda amb una configuració d'una sola falla, els resultats mostren asimetries, tant longitudinals com perpendiculars a les estructures. 2) En el segon cas s'estudia l'efecte de la sedimentació sintectònica sobre la geometria final d'un plec. Els resultats, obtinguts a partir de la comparació de l'evolució de les estructures considerant o no considerant sedimentació sintectònica, estableixen que la sedimentació sintectònica pot afectar tant al mecanisme de formació del plec com a la seva geometria final.
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Zhang, Aibin. "CFD Modeling and Optimization of Primary sedimentation tank." Thesis, KTH, Vattendragsteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217116.

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In this project, the flow field characteristics of the simplified 2D rectangular primary sedimentation tank in Syvab wastewater treatment plant were achieved by a transient water-air two phases finite-volume method, applying Volume-Of-Fluid (VOF) model. RNG k-ε turbulence model was also employed to calculate the turbulent kinetic energy and its dissipation rate. The undesired hydraulic phenomenon for solid sedimentation was detected in original tank. To reduce the velocity and turbulence intensity of the influent, two categories of optimization methods were proposed, which are installing the baffle and changing the velocity inlet. The modifying effects of different methods were compared by the velocity profiles and the contours of kinetic energy. It turns out that both ways provide a preferred condition for particle settling. In the end, further research was forecasted and the work direction were given.
I detta projekt uppnåddes 2D modellering av avloppsflödesfältets karaktär hos en förenklade och rektangulär primära sedimenteringsbassäng, Syvab avloppsreningsverk, genom en transient-tvåfas-finita-volymmetoden med vatten och luft, som tillämpades med Volume-Of-Fluid (VOF) modellen. RNG k-ε turbulensmodellen användes även för att beräkna den kinetiska energin av turbulas och dess dissipationshastighet. Detta för att oönskade hydrauliska fenomen har uppmärksammats hos sedimenteringsbassängen hos avloppsreningsverket. För att minska flödeshastigheten och turbulens föreslås två optimeringsmetoder, vilket är att installera skärm och att ändra inloppets hastighet. Eeffekterna av de olika metoderna jämförs med hjälp av hastighets- och kinetisk energiprofiler. Det visar sig att båda metoderna kan ge gynsammare tillstånd för sedimentering av partikelar. Som avslutning ges prognos för den fortsatta forskningen och arbetsriktningen inom ämnet.
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Sun, Hua. "Digital terrain modelling of catchment erosion and sedimentation /." Title page, contents and abstract only, 1998. http://web4.library.adelaide.edu.au/theses/09PH/09phs9565.pdf.

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Zhang, Feng. "Instability in Settling Fibres : A Numerical Study." Doctoral thesis, KTH, Mekanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-141037.

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Sedimenting suspensions exist in a varity of natural phenomena and industrial applications. It is already observed in experiments that the dilute fibre suspensions experience a concentration instability under gravity at low Reynolds numbers. Initially well-mixed suspensions become inhomogeneous and anisotropic due to this instability. This project is focused on the development and validation of numerical models to understand the instability in a dilute fibre suspension by means of the mixture model and the point-particle model. For periodic boundary condition, we use a linear stability analysis to show that inertia and hydro dynamic translational diffusion damp perturbations at long wavelengths and short wavelengths, respectively, leading to a wavenumber selection. However, numerical simulations indicate a weak wavenumber selection even at zero Reynolds number. Numerical simulations also show that the induced flow may either die or saturate on a finite amplitude. The characterof this long time behaviour is dictated by the wavenumber, the presence or absence of the translational diusivity, rotational diffusivity, and the fluid inertia on particle motions. Moreover, the most unstable wavenumber decreases with time and the maximum amplitude increases. The smallest wavenumber obtains the largest amplitude at steady state. For a vessel bounded by sidewalls, the near-wall convection is an upward back flow in the very beginning, due to the combined effects of the steric-depleted layer and a hydrodynamiclly-depleted region near the wall. However, the evolution of the near-wall convection at later times depends on the aspect ratio of the bres, the translational diffusivity and the initial perturbations. The steric-depleted layer in the mixture model can be neglected for large widths. Multiple streamers are obtained due to the sidewalls, implying that the sidewalls can generate a wavelength which is smaller than the channel width. The suspension ends up with a single streamer on one side of the container, consistent with the results of the cases with periodic boundary condition but different from the experimental results. This might be due to the absence of the botton wall in the mixture model. Moreover, the global structure evolution of a suspension is dependent on the width of the vessel and the amplitude ofthe initial perturbations.

QC 20140207

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Polorigni, Christian Leprince. "Primary sedimentation tank model with characterized settling velocity groups." Master's thesis, University of Cape Town, 2020. http://hdl.handle.net/11427/32526.

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Primary sedimentation involves the separation of solids and liquid in primary settling tanks (PSTs) of wastewater treatment systems. These physical processes are described by various settling conditions such as discrete and flocculent settling, along with other phenomena such as flocculation, coagulation, ammonification or hydrolysis. The modelling of primary sedimentation has often been overlooked because (i) it involves various intricacies that are difficult to replicate and (ii) primary sedimentation has been assumed to be an input to most of the main unit process models, including the activated sludge (AS) system and the anaerobic digestion (AD) models. Though there has been a wide range of proposed mathematical models to describe how PSTs function, the need to correctly disaggregate the total suspended solids (TSS) into realistic fractions of unbiodegradable particulate organics (UPO), biodegradable particulate organics (BPO) and inorganic settleable solids (ISS), remains. This is because PST models that are unable to correctly split the TSS into its characteristic components make incorrect assumptions. These assumptions lead to inconsistencies in predicting the compositions of the primary sludge (PS) that is fed to the AD unit and the settled wastewater (settled WW) that is treated in the AS system. Hence, it becomes difficult to correctly simulate the entire system (plant-wide) towards a holistic evaluation of system strategies. In this study, a realistic PST model was developed, with characterized settling velocity groups, within a plant-wide setting, for municipal wastewater. This involved the improvement of a current TSS-based model into a more accurate and realistic model that could account for the settling of raw wastewater particles. The model was therefore expected to predict the composition of the PS that is treated in the AD system and the composition of the settled WW that is going to the AS unit processes. This could be achieved by splitting the TSS into UPO, BPO and ISS fractions. In developing preparation of such a realistic PST model, the following objectives were established: 1. Disaggregate the TSS into realistic UPO, BPO and ISS fractions, by means of discrete particle settling modelling (Kowlesser, 2014) and the particle settling velocity distribution (PSVD) approach of Bachis et al. (2015). 2. Verify that the model is internally consistent with wastewater treatment plant (WWTP) data, by means of mathematical material mass balances and other specific scenarios. 3. Demonstrate the application and impact of such a model by performing steady state plant-wide simulations. Using the discrete particle settling approach of Kowlesser (2014), a discrete particle settling model was developed in Microsoft Excel and implemented into a dynamic PST framework in WEST® (Vanhooren et al., 2003). The discrete particle settling model was described using steady state and dynamic calculations and the insights obtained from these calculations were implemented in the current TSS-based PST model of Bachis et al. (2015). This was performed towards developing the University of Cape Town Primary Sedimentation Unit (UCTPSU). The influent raw wastewater TSS was fractionated into UPO, BPO and ISS fractions and settling proportions of these fractions were assigned to five settling velocity groups. In addition, a distinct settling velocity was assigned to each settling velocity group. Previous studies data from WRC (1984) and Ekama (2017), were used in the discrete particle settling model, which was able to reproduce PS and settled WW outputs, through steady state and dynamic calculations and under strict material mass balances. As a result, UPO, BPO and ISS settling proportions as well as settling velocities, were extracted from these calculations and used as input parameters into the UCTPSU model. This dynamic model was rigorously verified to be internally consistent with regards to strict material mass balances. The verification scenarios also included variations of high and low settling velocities as well as a combination of both high and low velocities and checking that the model was behaving as expected. The application and impact of the UCTPSU model were demonstrated using plant-wide scenarios in proposing a preliminary integration, under steady state conditions. It showed how incorrect disaggregation of the TSS into UPO, BPO and ISS fractions can lead to incorrect predictions in terms of the settled WW composition, the AS system capacity, the effluent quality, as well as the energy consumption and generation in the AS system and AD unit respectively. The investigation also revealed the need to measure key wastewater parameters such as particle settling velocities and the unbiodegradable particulate COD fraction, when it comes to realistically modelling of primary sedimentation of municipal wastewater, with the view of optimizing plant operations and tactical decision making. The study thereafter recommended the need to conduct an extensive experimental campaign to measure in-situ diurnal data, mainly in terms of settling velocities and settling proportions of UPO, BPO and ISS. It was also suggested to use the settleometer as a tool to extract these settling velocities and settling proportions, after performing biodegradability tests. As such, the data collected from the experimental campaign and the biodegradability tests could be used in calibrating the UCTPSU model and validation could be undertaken by means of full plant scale data.
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Books on the topic "Sedimentation modes"

1

Sedimentation rate through environmental radioactivity: Models and applications. Hamilton, Ont: Environmental Research & Publications, 2002.

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Copeland, Ronald R. San Lorenzo River sedimentation study: Numerical model investigation. Vicksburg, Miss: Hydraulics Laboratory, Dept. of the Army, Waterways Experiment Station, Corps of Engineers, 1986.

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Copeland, Ronald R. San Lorenzo River sedimentation study: Numerical model investigation. Vicksburg, Miss: Hydraulics Laboratory, Dept. of the Army, Waterways Experiment Station, Corps of Engineers, 1986.

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Vermeyen, Tracy. Erosional and depositional characteristics of cohesive sediments found in Elephant Butte Reservoir, New Mexico. Denver, Colo: Water Resources Research Laboratory, Water Resources Services, Technical Service Center, Denver, Colorado, U.S. Bureau of Reclamation, 1995.

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Diagenetic bedding: A model for marl-limestone alternations. Berlin: Springer-Verlag, 1986.

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Rijn, L. C. van. SUTRENCH-model: Two-dimensional vertical mathematical model for sedimentation in dredged channels and trenches by currents and waves. The Hague: Rijkswaterstaat, 1985.

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Phanerozoic phosphorite depositional systems: A dynamic model for a sedimentary resource system. Berlin: Springer, 1998.

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Tavener-Smith, R. Sedimentary models for coal formation in the Paulpietersburg-Charlestown area of northern Natal. Pretoria: Geological Survey, Dept. of Mineral and Energy Affairs, Republic of South Africa, 1987.

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Carbonate rock depositional models: A microfacies approach. Englewood Cliffs, N.J: Prentice Hall, 1989.

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Rijn, L. C. van. Principles of sedimentation and erosion engineering in rivers, estuaries and coastal seas. Amsterdam: Aqua Publications, 2005.

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Book chapters on the topic "Sedimentation modes"

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Pugh, Clifford A. "Sediment Transport Scaling for Physical Models." In Sedimentation Engineering, 1057–65. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/9780784408148.apc.

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Lyn, D. A. "Turbulence Models for Sediment Transport Engineering." In Sedimentation Engineering, 763–825. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/9780784408148.ch16.

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Cui, Yantao, and Andrew Wilcox. "Development and Application of Numerical Models of Sediment Transport Associated with Dam Removal." In Sedimentation Engineering, 995–1020. Reston, VA: American Society of Civil Engineers, 2008. http://dx.doi.org/10.1061/9780784408148.ch23.

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Tetzlaff, Daniel M., and John W. Harbaugh. "Adapting the Navier-Stokes Equations for a Flow Model." In Simulating Clastic Sedimentation, 11–32. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4757-0692-5_2.

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Yizhaq, Hezi, Neil J. Balmforth, and Antonello Provenzale. "An Integro-Differential Model for The Dynamics of Aeolian Sand Ripples." In Sedimentation and Sediment Transport, 187–94. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-0347-5_30.

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Rempfer, Dietmar, Louise Parsons, Sheng Xu, and John Lumley. "Turbulent Boundary Layers Over Compliant Walls: Low-Dimensional Models and Direct simulations." In Sedimentation and Sediment Transport, 43–50. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-017-0347-5_5.

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Miall, Andrew D. "Tectonism and Sedimentation: Principles and Models." In Principles of Sedimentary Basin Analysis, 381–416. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-03999-1_7.

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Bürger, R. "Phenomenological Model of Sedimentation-Consolidation Processes." In Multifield Problems, 34–41. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-04015-7_4.

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Singh, Raj Mohan. "Wavelet-ANN Model for River Sedimentation Predictions." In Advances in Intelligent Systems and Computing, 1–13. India: Springer India, 2012. http://dx.doi.org/10.1007/978-81-322-1041-2_1.

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De, Alak. "New Mode of Column Settling Data Analysis." In Sedimentation Process and Design of Settling Systems, 119–42. New Delhi: Springer India, 2017. http://dx.doi.org/10.1007/978-81-322-3634-4_8.

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Conference papers on the topic "Sedimentation modes"

1

Olunloyo, Vincent O. S., Charles A. Osheku, and Adekunle O. Adelaja. "On the Mechanics of Pipewalking: Case of a Buried Pipeline." In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20094.

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The influence of soil sedimentation on the pipe walking phenomenon is investigated analytically via a set of coupled nonlinear partial differential equations where the effects of operating variables such as internal fluid temperature variation, prestress and internal pressurization, Coriolis and axial accelerations of the internal fluid and cross sectional area change are fully captured. For this problem, a segment of an offshore pipeline resting on the ocean floor is idealized as elastic beam on an elastic foundation using recently refined Euler-Bernoulli beam theory. By invoking integral transforms, closed form analytical expressions for displacement of the fluid-pipe-soil interaction system associated with pipe walking is computed. Simulated results showed that pipe walking phenomenon is strongly dependent on sedimentation level, friction at the interface of pipe-ocean sub soil layer, temperature variation, fluctuations in internal fluid pressurisation and oscillatory strain of the pipe in both transverse and longitudinal modes.
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Wang, Shouxin, Yabing Guo, and Yuxian Hu. "Mathematics Model of Sedimentation and Application in Industrial Sedimentation." In 2010 International Conference on E-Product E-Service and E-Entertainment (ICEEE 2010). IEEE, 2010. http://dx.doi.org/10.1109/iceee.2010.5660549.

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Vickery, Rhonda J., Timothy Keen, Robert J. Moorhead II, Randy Brou, Daniel Carruth, and Stephanie Doane. "Volume visualization of 5D sedimentation models." In Electronic Imaging 2002, edited by Robert F. Erbacher, Philip C. Chen, Matti Groehn, Jonathan C. Roberts, and Craig M. Wittenbrink. SPIE, 2002. http://dx.doi.org/10.1117/12.458783.

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Guo, Yabing, Yuxian Hu, and Binzheng Li. "Application Analysis of One-Dimensional Sedimentation Model." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5516986.

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Downing, J. P., N. C. Shi, and L. H. Larsen. "Two-Dimensional Sedimentation Model for Shallow Water." In Offshore Technology Conference. Offshore Technology Conference, 1985. http://dx.doi.org/10.4043/4906-ms.

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Chudinova, D. Yu, and E. M. Makhnytkin. "Improvement of Geological Models Using Sedimentation Data." In Geomodel 2021. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202157099.

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Li, Daming, Yu Fan, and Ling Bai. "Research on Sedimentation Mathematical Model of Miaogong Reservoir." In 2012 2nd International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2012. http://dx.doi.org/10.1109/rsete.2012.6260702.

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Hong-ying, Jiang, and Lu Jin-bu. "Research on Sedimentation Mechanism Model of Granular Packs." In 2009 International Conference on Information Management, Innovation Management and Industrial Engineering. IEEE, 2009. http://dx.doi.org/10.1109/iciii.2009.526.

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Simões, Francisco J. M., and Chih Ted Yang. "A Numerical Model for Reservoir Sedimentation (GSTARS 3.0)." In World Water and Environmental Resources Congress 2001. Reston, VA: American Society of Civil Engineers, 2001. http://dx.doi.org/10.1061/40569(2001)145.

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Yamaikina, Irene V. "New data and mathematical model of erythrocyte sedimentation." In BiOS '97, Part of Photonics West, edited by Alexander V. Priezzhev, Toshimitsu Asakura, and Robert C. Leif. SPIE, 1997. http://dx.doi.org/10.1117/12.273627.

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Reports on the topic "Sedimentation modes"

1

Rector, D. R., and B. C. Bunker. Sedimentation models. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/108208.

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Karl, Joanna. Gravity Sedimentation: A One-Dimensional Numerical Model. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6478.

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Shippy, J. L. III, and J. S. Watson. Application of sedimentation model to uniform and segregated fluidized beds. Office of Scientific and Technical Information (OSTI), October 1990. http://dx.doi.org/10.2172/6080665.

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Syvitski, James P., and Mark D. Morehead. Numerical Coupling of River Discharge to Shelf/Slope Sedimentation Models. Fort Belvoir, VA: Defense Technical Information Center, January 1997. http://dx.doi.org/10.21236/ada345371.

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Lewis, James, and Ronald Copeland. Mississippi River and Tributaries flowline assessment : Atchafalaya River sedimentation model report. Engineer Research and Development Center (U.S.), May 2019. http://dx.doi.org/10.21079/11681/32663.

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Davinroy, Robert D., David C. Gordon, and Robert D. Hetrick. Sedimentation Study of the Mississippi River, Santa Fe Chute, Doolan Chute, Hydraulic Micro Model Investigation. Fort Belvoir, VA: Defense Technical Information Center, September 1996. http://dx.doi.org/10.21236/ada324213.

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Davinroy, Robert D., David C. Gordon, and Robert D. Hetrick. Sedimentation Study of the Mississippi River Sante Fe Chute, Doolan Chute, Hydraulic Micro Model Investigation. Volume 1. Fort Belvoir, VA: Defense Technical Information Center, September 1996. http://dx.doi.org/10.21236/ada378959.

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Mitchell, David L. Final scientific report for DOE award title: Improving the Representation of Ice Sedimentation Rates in Global Climate Models. Office of Scientific and Technical Information (OSTI), September 2013. http://dx.doi.org/10.2172/1091952.

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