subject:(grain sorting)

University of South Carolina

1. Mahjabeen, Nabila. Experimental Study of Longitudinal Sorting of Particles Differing in Size and Density.

Degree: MS, Civil and Environmental Engineering, 2015, University of South Carolina

URL: https://scholarcommons.sc.edu/etd/3291

► Transport, deposition and erosion of sediment particles differing in size, shape and density may result in particle segregation, which in geosciences applications is generally… (more)

▼ Transport, deposition and erosion of sediment particles differing in size, shape and density may result in particle segregation, which in geosciences applications is generally referred to as sediment sorting. A thorough understanding of sediment sorting processes is important to describe and model a wide variety of natural processes such as the decrease in particle size and/or density in a fluvial system (downstream fining and/or lightening), the formation of economic placers, concentration of heavy minerals, chemical and metal pollutants etc. Sorting of sediment grains associated with sediment transport in the streamwise direction results in the development of longitudinal sorting patterns. Vertical sorting patterns are the results of sediment sorting within the alluvial deposit. Laboratory experiments were conducted at the Hydraulics Laboratory, University of South Carolina to study the physical processes associated with the transport of a mixture of particles differing in size and density, and the resulting longitudinal sorting patterns. Experiments were performed in a sediment feed flume, which is an experimental set up that is traditionally used for these type of studies. Three experiments were performed with sediment mixture differing in both size and density, the sediment feed rate and the flow rate of water were held constant in each experiment. The sediment feed rate was the only parameter that changed from one experiment to the next. In each experiment data were collected to characterize equilibrium and non-equilibrium conditions, with equilibrium referring to a condition in which the characteristics of the flow and the sediment transport can be reasonably considered steady and uniform. The analysis of the experimental data shows that 1) a downstream lightening pattern developed in the experiment with the highest feed rate, which means that the heavy particles were preferentially deposited in the upstream part of the deposit and the light particles travelled further downstream; 2) a downstream fining pattern was observed in the experiments with a comparatively low feed rate, with the coarse particles deposited in the upstream part of the deposit and the finer particles deposited further downstream. Advisors/Committee Members: Jasim Imran.

Subjects/Keywords: Civil and Environmental Engineering; Engineering; Downstream Fining; Downstream Lightening; Grain Size Distribution; Lee face Sediment Sorting; Longitudinal sorting; Mobile Bed Equilibrium

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APA (6^th Edition):

Mahjabeen, N. (2015). Experimental Study of Longitudinal Sorting of Particles Differing in Size and Density. (Masters Thesis). University of South Carolina. Retrieved from https://scholarcommons.sc.edu/etd/3291

Chicago Manual of Style (16^th Edition):

Mahjabeen, Nabila. “Experimental Study of Longitudinal Sorting of Particles Differing in Size and Density.” 2015. Masters Thesis, University of South Carolina. Accessed January 24, 2021. https://scholarcommons.sc.edu/etd/3291.

MLA Handbook (7^th Edition):

Mahjabeen, Nabila. “Experimental Study of Longitudinal Sorting of Particles Differing in Size and Density.” 2015. Web. 24 Jan 2021.

Vancouver:

Mahjabeen N. Experimental Study of Longitudinal Sorting of Particles Differing in Size and Density. [Internet] [Masters thesis]. University of South Carolina; 2015. [cited 2021 Jan 24]. Available from: https://scholarcommons.sc.edu/etd/3291.

Council of Science Editors:

Mahjabeen N. Experimental Study of Longitudinal Sorting of Particles Differing in Size and Density. [Masters Thesis]. University of South Carolina; 2015. Available from: https://scholarcommons.sc.edu/etd/3291

Université de Grenoble

2. Bacchi, Vito. Etude expérimentale de la dynamique sédimentaire d'un système à forte pente soumis à des conditions hydrauliques faibles : An experimental study of the sediment dynamic of a torrential system under weak flow conditions.

Degree: Docteur es, Sciences de l'univers, 2011, Université de Grenoble

URL: http://www.theses.fr/2011GRENU020

► Cette thèse, à dominante expérimentale, tente de décrire, de comprendre et de quantifier le transport sédimentaire pour un système torrentiel caractérisé par une forte pente… (more)

▼ Cette thèse, à dominante expérimentale, tente de décrire, de comprendre et de quantifier le transport sédimentaire pour un système torrentiel caractérisé par une forte pente et des conditions hydrauliques faibles. Une plateforme expérimentale a été mise en place et instrumentée. Elle permet de contrôler quatre paramètres du système : la pente du canal, le débit hydraulique, le débit solide et la granulométrie. La durée des expériences est suffisamment longue pour couvrir l'ensemble des fluctuations gouvernant le transport. L'étude de l'évolution d'un même mélange granulaire soumis à un forçage hydraulique fort, (Shield = 1.37 Shield critique) ou à un forçage hydraulique faible (Shield = 0.94 Shield critique) a permis de mettre en évidence, au sein des structures sédimentaires observées, deux classes de comportement différentes. Pour l'expérience à Faible Transport, le lit est globalement pavé au cours de la durée de l'expérience qui est de 110 heures. Des structures de type step-pools sont présentes et très stables, et contrôlent la dynamique de transport du système à court terme et à long terme. A court terme, le transport solide n'est pas uniforme mais s'effectue à travers des processus transitoires d'érosion et de dépôt « de proche en proche », associés respectivement à la destruction et à la formation de step-pools dans le système. A long terme, les step-pools conduisent à un pavage uniforme sur l'ensemble du canal. Des destructions périodiques de ce pavage de surface sont également observées et sont associées à une capacité de transport pour le système pouvant atteindre jusqu'à 15 fois le débit solide moyen. Pour l'expérience à Fort Transport, d'une durée de 92 heures, la morphologie du lit fluctue entre deux états extrêmes. Un lit plat dont la surface est formée de particules fines, à forte capacité de transport et un lit pavé à forte pente et à faible capacité de transport. Les step-pools ne sont, ici, que des états éphémères associés à la phase de transition du système qui sont rapidement détruits par les nappes de charriage. Ces dernières sont le mode principal de transport pour le système et expliquent les évolutions cycliques mesurées à court et à long terme. Enfin, nous avons étudié les conséquences des phénomènes décrits ci-dessus en conditions hors équilibre à forte pente. Nous avons pour cela réalisé deux expériences : une première expérience où nous étudions le cas d'un système en phase d'aggradation et une seconde où nous prenons le cas d'un système contrôlé par deux seuils de correction torrentielle. La première a nécessité une longue période afin que le système atteigne une condition d'équilibre dynamique : plus que 210 heures. L'équilibre local du système est atteint progressivement de l'amont vers l'aval, les parties les plus proches de l'alimentation atteignant en premiers l'état d'équilibre. De plus, pendant l'aggradation les fluctuations du système autour de la moyenne sont inférieures à celles mesurées pour un système à l'équilibre. La seconde expérience a montré que l'aménagement d'un… Advisors/Committee Members: Naaim, Mohamed (thesis director).

Subjects/Keywords: Charriage; Forte pente; Tri granulométrique; Morphologie torrentielle; Bedload transport; Steep slopes; Grain sorting; Bed morphology

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APA (6^th Edition):

Bacchi, V. (2011). Etude expérimentale de la dynamique sédimentaire d'un système à forte pente soumis à des conditions hydrauliques faibles : An experimental study of the sediment dynamic of a torrential system under weak flow conditions. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2011GRENU020

Chicago Manual of Style (16^th Edition):

Bacchi, Vito. “Etude expérimentale de la dynamique sédimentaire d'un système à forte pente soumis à des conditions hydrauliques faibles : An experimental study of the sediment dynamic of a torrential system under weak flow conditions.” 2011. Doctoral Dissertation, Université de Grenoble. Accessed January 24, 2021. http://www.theses.fr/2011GRENU020.

MLA Handbook (7^th Edition):

Bacchi, Vito. “Etude expérimentale de la dynamique sédimentaire d'un système à forte pente soumis à des conditions hydrauliques faibles : An experimental study of the sediment dynamic of a torrential system under weak flow conditions.” 2011. Web. 24 Jan 2021.

Vancouver:

Bacchi V. Etude expérimentale de la dynamique sédimentaire d'un système à forte pente soumis à des conditions hydrauliques faibles : An experimental study of the sediment dynamic of a torrential system under weak flow conditions. [Internet] [Doctoral dissertation]. Université de Grenoble; 2011. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2011GRENU020.

Council of Science Editors:

Bacchi V. Etude expérimentale de la dynamique sédimentaire d'un système à forte pente soumis à des conditions hydrauliques faibles : An experimental study of the sediment dynamic of a torrential system under weak flow conditions. [Doctoral Dissertation]. Université de Grenoble; 2011. Available from: http://www.theses.fr/2011GRENU020

Université de Grenoble

3. Leduc, Pauline. Etude expérimentale de la dynamique sédimentaire des rivières en tresses : Experimental study of braided rivers dynamics.

Degree: Docteur es, Sciences de la terre et de l'univers, et de l'environnement, 2013, Université de Grenoble

URL: http://www.theses.fr/2013GRENU039

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Les mécanismes complexes qui régissent la morphologie des rivières en tresses et l'interaction avec le tri granulométrique restent encore à approfondir. Cette thèse s'articule autour… (more)

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Les mécanismes complexes qui régissent la morphologie des rivières en tresses et l'interaction avec le tri granulométrique restent encore à approfondir. Cette thèse s'articule autour de trois thèmes : l'étude de la déstabilisation d'un système en tresses puis sa mise à l'équilibre, l'interaction de la morphologie avec le tri granulométrique et enfin la prédiction du transport solide. Pour cela, nous avons étudié 3 modélisations de différents systèmes alluviaux : des bancs alternés en granulométrie étendue (durée 100h), un système en tresses en granulométrie uniforme (durée 385h) et enfin un système en granulométrie étendue (durée 435h). Chaque modèle de tresses a subi plusieurs changements de conditions d'alimentation. Il ressort que seul un paramètre, la surface du lit situé au delà de la pente moyenne, pourrait être un bon candidat pour comparer l'état d'équilibre (érosion ou exhaussement) de différents systèmes. Pour une étude d'un site donnée, les paramètres classiques comme la pente ou le Bed Relief Index (BRI) sont tout aussi pertinents. Le tri granulométrique sur les systèmes divaguants se manifeste de plusieurs façons : il est à l'origine de la migration du chenal principal et participe activement à la formation de patchs sédimentaires, catalyseurs de l'émergence des bancs. Les lobes sédimentaires qui se retrouvent dans le modèle en granulométrie uniforme n'apparaissent que dans certains cas, laissant place à une mobilité des sédiments discontinue, généralement de proche en proche. La modélisation du transport solide dans ces systèmes à faciès complexes se heurte à la forte variabilité des conditions hyro-sédimentaires. L'abondance de confluences et des fronts de bancs modifie la relation de transport avec les conditions locales. L'influence de la morphologie est prépondérante dans la dynamique du transport solide.

Complex mechanisms involved in braided rivers morphology and the interaction with the grain sorting are slightly studied. Throughout this thesis, we study the morphological signature of a system at equilibrium, and the interaction between the bed morphology and grain sorting. From our small-scale experiments, we studied the prediction of sediment transport. We studied three different small-scale streams, a alternate bars model with heterogeneous sediment (duration 100h), a braided stream model using uniform sand (duration 385h) and a braided stream model using sand and coarse sand mixture (duration 435h). Upstream conditions have been changed several times for each braided stream. It appears that the only one relevant index to compare sediments stages of different streams is the surface above the average slope. To study a single site's evolution, the traditional parameters such as slope or Bed Relief Index (BRI) are relevant enough. We observed different effects of grain sorting. First, grain sorting is responsible of selective depositions and led to active channel migration. The selective deposition leads to bar emergence. Sedimentary lobes that we observed on uniform sand model were rarely…

Advisors/Committee Members: Naaim, Mohamed (thesis director), Recking, Alain (thesis director).

Subjects/Keywords: Rivière en tresses; Morphologie; Équilibre; Tri granulométrique; Charriage; Braided rivers; Morphology; Equilibrium; Grain sorting; Bed load; 550

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APA (6^th Edition):

Leduc, P. (2013). Etude expérimentale de la dynamique sédimentaire des rivières en tresses : Experimental study of braided rivers dynamics. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2013GRENU039

Chicago Manual of Style (16^th Edition):

Leduc, Pauline. “Etude expérimentale de la dynamique sédimentaire des rivières en tresses : Experimental study of braided rivers dynamics.” 2013. Doctoral Dissertation, Université de Grenoble. Accessed January 24, 2021. http://www.theses.fr/2013GRENU039.

MLA Handbook (7^th Edition):

Leduc, Pauline. “Etude expérimentale de la dynamique sédimentaire des rivières en tresses : Experimental study of braided rivers dynamics.” 2013. Web. 24 Jan 2021.

Vancouver:

Leduc P. Etude expérimentale de la dynamique sédimentaire des rivières en tresses : Experimental study of braided rivers dynamics. [Internet] [Doctoral dissertation]. Université de Grenoble; 2013. [cited 2021 Jan 24]. Available from: http://www.theses.fr/2013GRENU039.

Council of Science Editors:

Leduc P. Etude expérimentale de la dynamique sédimentaire des rivières en tresses : Experimental study of braided rivers dynamics. [Doctoral Dissertation]. Université de Grenoble; 2013. Available from: http://www.theses.fr/2013GRENU039

Universiteit Utrecht

4. Frings, R.M. From gravel to sand. Downstream fining of bed sediments in the lower river Rhine.

Degree: 2007, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/25920

► A common characteristic of many rivers is the tendency for bed sediments to become finer in downstream direction. This phenomenon, which is generally known as… (more)

▼ A common characteristic of many rivers is the tendency for bed sediments to become finer in downstream direction. This phenomenon, which is generally known as downstream fining, has a strong effect on the morphologic and hydrodynamic behaviour of a river. The fundamental causes of downstream fining are abrasion (the progressive breakdown of particles during their downstream transport) and selective transport (the preferential downstream transport of fine particles), but the effects of these processes are sometimes overshadowed by the external addition of sediment to the river (e.g. at tributary confluences), or by the extraction of sediment from the channel (e.g. by dredging). The intensity of abrasion, selective transport and sediment addition-extraction processes is determined by external controls, such as climate, tectonics and human impact. The downstream fining rate that is observed in a river thus is a function of: (1) abrasion and selective transport, (2) sediment addition-extraction processes, and (3) external controls. Laboratory and field studies have greatly elucidated the effects of these processes and controls on downstream fining in gravel-bed rivers, but considerably less attention has been paid to downstream fining in sand-bed rivers and to the abrupt transition from a gravel-bed river to a sand-bed river. The general objective of this thesis was to determine the influence of abrasion, selective transport, sediment addition-extraction processes and external controls on downstream fining in sand-bed rivers and gravel-sand transition zones. The focus of the thesis is on large, alluvial, meandering, lowland rivers, such as the downstream reaches of the Ganges, Rhine, Mississippi and Niger. The lower river Rhine served as study case. To meet the general research objective, different approaches were followed. First, an extensive literature review was done in order to identify all relevant processes and controls. Second, a large data set of sediment transport measurements was analysed to study selective transport processes and an important addition-extraction process: the complex sediment distribution at river bifurcations. Third, geological, historical and modern data were combined to study the external control of human interference on downstream fining. Fourth, a porosity model was developed to determine how the bed structure of a river changes in downstream direction. Fifth, the porosity model was combined with sedimentological data to estimate the effect of bed structure and sediment sorting on the transport selectivity in gravel-sand transition zones. Finally, a numerical downstream fining model was constructed in order to determine the interactions between selective transport processes, addition-extraction processes and external controls on downstream fining. With respect to sand-bed rivers, it was found that the intrinsic cause of downstream fining is selective transport, which takes place during bed-load transport and suspended load transport, and is strongly enhanced by sorting…

Subjects/Keywords: Earth Sciences; river morphology; river bifurcations; grain size; downstream fining; gravel-sand transition; sediment sorting; sediment transport; selective transport; porosity; bed forms; wash load; Rhine; human impact; numerical model

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Frings, R. M. (2007). From gravel to sand. Downstream fining of bed sediments in the lower river Rhine. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/25920

Chicago Manual of Style (16^th Edition):

Frings, R M. “From gravel to sand. Downstream fining of bed sediments in the lower river Rhine.” 2007. Doctoral Dissertation, Universiteit Utrecht. Accessed January 24, 2021. http://dspace.library.uu.nl:8080/handle/1874/25920.

MLA Handbook (7^th Edition):

Frings, R M. “From gravel to sand. Downstream fining of bed sediments in the lower river Rhine.” 2007. Web. 24 Jan 2021.

Vancouver:

Frings RM. From gravel to sand. Downstream fining of bed sediments in the lower river Rhine. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2007. [cited 2021 Jan 24]. Available from: http://dspace.library.uu.nl:8080/handle/1874/25920.

Council of Science Editors:

Frings RM. From gravel to sand. Downstream fining of bed sediments in the lower river Rhine. [Doctoral Dissertation]. Universiteit Utrecht; 2007. Available from: http://dspace.library.uu.nl:8080/handle/1874/25920

5. Sirks, E.E. (author). Sediment sorting at a large scale nourishment.

Degree: 2013, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:8270c705-832f-4556-9f03-5a1670256e77

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A new approach in coastal maintenance is the application of a large scale nourishment as natural feeder of the coast. The Sand Motor constructed near… (more)

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A new approach in coastal maintenance is the application of a large scale nourishment as natural feeder of the coast. The Sand Motor constructed near Kijkduin on the Holland Coast is a pilot project of this new nourishment strategy. The objective of this research is to contribute to a better understanding of the sediment transport processes at nourishments by analysing the sediment sorting processes. Field data of the sediment characteristics in the Sand Motor area is used to determine the sediment sorting in the Sand Motor area. A numerical model (Delft3D) is used to simulate the sediment sorting processes and time scales in the cross-shore direction at a large scale nourishment. The measurement data showed an increase of the sediment sorting in the longshore direction. The sediment at the Sand Motor was coarser than the sediment in the area North of the Sand Motor. It is hypothesised that the fining North of the Sand Motor is caused by the deposition of relatively fine material that is eroded at the Sand Motor. A measured decrease of the uniformity coefficient at the Sand Motor is in accordance with this hypothesis. In the cross-shore direction the minimum median grain size in the transects was found to move seaward after the construction of the Sand Motor. It is assumed that the wave conditions preceding these measurements influenced the location of the minimum median grain size. Higher wave conditions are assumed to lead to a minimum median grain size located further offshore due to the stronger undertow. The model results show a strong influence of the sedimentation and erosion in the profile on the sediment sorting pattern. This pattern is found to be independent of the initial bathymetry and initial sediment composition of the nourishment. It is shown that extreme wave heights have a large influence on the sediment distribution in the profile as wave conditions determine the area where sediment sorting takes place. Furthermore, the sediment distribution also responds more quickly to higher waves. Finally, the hypothesis is confirmed that the location of the minimum median grain size in the profile depends on the wave conditions. Model results show that the location of the minimum median grain size is located at the edge of the morphologically active profile and is thus related to the wave height via the closure depth formulation. To conclude, this research consists of new measurement information on the sediment composition in the Sand Motor area and a comparison of this data set with existing measurement campaigns. This information shows the influence of the Sand Motor on the alongshore and cross-shore sediment sorting and states the influence of the wave conditions on the location of the minimum median grain size in the profile. The model study shows the utility of a relatively simple Delft3D model to study the influence of different parameters on the sediment sorting processes and the timescale of these processes.

Coastal Engineering

Hydraulic Engineering

Civil Engineering and Geosciences

Advisors/Committee Members: Huisman, B.J.A. (mentor), Stive, M.J.F. (mentor), Storms, J.E.A. (mentor), Walstra, D.J.R. (mentor).

Subjects/Keywords: sediment sorting; grain size; nourishment; Sand Motor; cross-shore

…variation of grain size parameters. The sediment sorting at a nourishment is expected to be a… …ii Higher wave conditions are assumed to lead to a minimum median grain size located… …measured sediment sorting qualitatively, as the general trend of the sediment sorting is the same… …and the location of the minimum median grain size appears to be related to the wave height… …profile on the sediment sorting pattern. This pattern is found to be independent of the initial…

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APA (6^th Edition):

Sirks, E. E. (. (2013). Sediment sorting at a large scale nourishment. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8270c705-832f-4556-9f03-5a1670256e77

Chicago Manual of Style (16^th Edition):

Sirks, E E (author). “Sediment sorting at a large scale nourishment.” 2013. Masters Thesis, Delft University of Technology. Accessed January 24, 2021. http://resolver.tudelft.nl/uuid:8270c705-832f-4556-9f03-5a1670256e77.

MLA Handbook (7^th Edition):

Sirks, E E (author). “Sediment sorting at a large scale nourishment.” 2013. Web. 24 Jan 2021.

Vancouver:

Sirks EE(. Sediment sorting at a large scale nourishment. [Internet] [Masters thesis]. Delft University of Technology; 2013. [cited 2021 Jan 24]. Available from: http://resolver.tudelft.nl/uuid:8270c705-832f-4556-9f03-5a1670256e77.

Council of Science Editors:

Sirks EE(. Sediment sorting at a large scale nourishment. [Masters Thesis]. Delft University of Technology; 2013. Available from: http://resolver.tudelft.nl/uuid:8270c705-832f-4556-9f03-5a1670256e77

6. Kleinhans, M.G. Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers.

Degree: 2002, University Utrecht

URL: https://dspace.library.uu.nl/handle/1874/545 ; URN:NBN:NL:UI:10-1874-545 ; 1874/545 ; URN:NBN:NL:UI:10-1874-545 ; https://dspace.library.uu.nl/handle/1874/545

► The general aim of this PhD-project was to gain better understanding of the sediment transport and depositional processes of sand-gravel mixtures in rivers with subaqueous… (more)

▼ The general aim of this PhD-project was to gain better understanding of the sediment transport and depositional processes of sand-gravel mixtures in rivers with subaqueous dunes. The understanding of the fundamental processes of sediment transport and deposition in channel beds is crucial for morphological models. Sand-gravel bed rivers have a mixture of sand and gravel in their beds, and have dunes while the coarsest sediment is near incipient motion. In this thesis, the sediment transport, sorting and deposition processes are studied with field measurements and laboratory experiments. Existing bedform stability diagrams were shown to be valid for bedforms observed in sand- gravel bed rivers and experiments, but new bedform types were identified as well: sand ribbons, barchans and bedload sheets. When the bed surface is armoured, barchans and sand ribbons are dependend on the sediment supply from upstream. This supply is often not predictable from the local hydraulics and sediment characteristics. A predictor for bedload transport of sediment mixtures was developed by extending existing deterministic bedload transport predictors to non-uniform sediment, based on flume experiments reported herein. The near-bed turbulence is modelled stochastically to obtain realistic bedload transport rates at incipient motion. The difference in mobility of small and large grains is represented by hiding-exposure functions. The transport predictor was tested on data from the river Rhine, the Netherlands during a discharge wave in 1998. For the measurements, a new measurement strategy was developed during a discharge wave in 1997, leading to an uncertainty in transport rates of less than 20%. Strong time-lag effects were observed in the field that could not be hindcast by the predictor. Part of the observed hysteresis can be explained by vertical sorting of bedload sediment by the dunes, combined with the time lag between dune height development and the changing flow. A record of vertically sorted sediment is left in the channel bed after a discharge wave, which is the antecedent sorting for the next discharge wave, often called history effect'. The entrainment and deposition depth of the sediment depends on the dune trough level below the average bed level and therefore on the dune height. The vertical sorting is in general fining upward by two processes: by grain flows at the lee side of the dunes, and by grain size-selective entrainment and deposition in the dune troughs (gravel lag deposit). Both processes are studied in detail in additional experiments in both equilibrium and non-equilibrium conditions (discharge events). The implications of these results for modelling are discussed.

Subjects/Keywords: river; sand; gravel; bedform; sediment transport; sedimentology; sediment sorting; grain flow; flood; bifurcation

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APA (6^th Edition):

Kleinhans, M. G. (2002). Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers. (Doctoral Dissertation). University Utrecht. Retrieved from https://dspace.library.uu.nl/handle/1874/545 ; URN:NBN:NL:UI:10-1874-545 ; 1874/545 ; URN:NBN:NL:UI:10-1874-545 ; https://dspace.library.uu.nl/handle/1874/545

Chicago Manual of Style (16^th Edition):

Kleinhans, M G. “Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers.” 2002. Doctoral Dissertation, University Utrecht. Accessed January 24, 2021. https://dspace.library.uu.nl/handle/1874/545 ; URN:NBN:NL:UI:10-1874-545 ; 1874/545 ; URN:NBN:NL:UI:10-1874-545 ; https://dspace.library.uu.nl/handle/1874/545.

MLA Handbook (7^th Edition):

Kleinhans, M G. “Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers.” 2002. Web. 24 Jan 2021.

Vancouver:

Kleinhans MG. Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers. [Internet] [Doctoral dissertation]. University Utrecht; 2002. [cited 2021 Jan 24]. Available from: https://dspace.library.uu.nl/handle/1874/545 ; URN:NBN:NL:UI:10-1874-545 ; 1874/545 ; URN:NBN:NL:UI:10-1874-545 ; https://dspace.library.uu.nl/handle/1874/545.

Council of Science Editors:

Kleinhans MG. Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers. [Doctoral Dissertation]. University Utrecht; 2002. Available from: https://dspace.library.uu.nl/handle/1874/545 ; URN:NBN:NL:UI:10-1874-545 ; 1874/545 ; URN:NBN:NL:UI:10-1874-545 ; https://dspace.library.uu.nl/handle/1874/545

Brno University of Technology

7. Roháčová, Denisa. Vliv zrnitosti krycí vrstvy na hydraulickou drsnost dna: Change of bed roughness by particle separation in the surface layer.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/30027

► This master thesis is divided into two parts: theoretical and practical one. In the theoretical part there is described hydraulic roughness, velocity distribution in the… (more)

Subjects/Keywords: Hydraulická drsnost; hydraulický odpor; třídění zrn; rychlostní profil; počátek pohybu splavenin; měření; bodová rychlost; třecí rychlost; Nikuradseho ekvivalentní písková drsnostní výška; krycí vrstva.; Hydraulic roughness; hydraulic resistance; grain sorting process; velocity distribution; initiation of sediment motion; measurement; point velocity; shear velocity; Nikuradse sand grain size; surface layer.

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APA (6^th Edition):

Roháčová, D. (2019). Vliv zrnitosti krycí vrstvy na hydraulickou drsnost dna: Change of bed roughness by particle separation in the surface layer. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/30027

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Roháčová, Denisa. “Vliv zrnitosti krycí vrstvy na hydraulickou drsnost dna: Change of bed roughness by particle separation in the surface layer.” 2019. Thesis, Brno University of Technology. Accessed January 24, 2021. http://hdl.handle.net/11012/30027.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Roháčová, Denisa. “Vliv zrnitosti krycí vrstvy na hydraulickou drsnost dna: Change of bed roughness by particle separation in the surface layer.” 2019. Web. 24 Jan 2021.

Vancouver:

Roháčová D. Vliv zrnitosti krycí vrstvy na hydraulickou drsnost dna: Change of bed roughness by particle separation in the surface layer. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/11012/30027.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Roháčová D. Vliv zrnitosti krycí vrstvy na hydraulickou drsnost dna: Change of bed roughness by particle separation in the surface layer. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/30027

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universiteit Utrecht

8. Kleinhans, M.G. Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers.

Degree: 2002, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/545

► The general aim of this PhD-project was to gain better understanding of the sediment transport and depositional processes of sand-gravel mixtures in rivers with subaqueous… (more)

▼ The general aim of this PhD-project was to gain better understanding of the sediment transport and depositional processes of sand-gravel mixtures in rivers with subaqueous dunes. The understanding of the fundamental processes of sediment transport and deposition in channel beds is crucial for morphological models. Sand-gravel bed rivers have a mixture of sand and gravel in their beds, and have dunes while the coarsest sediment is near incipient motion. In this thesis, the sediment transport, sorting and deposition processes are studied with field measurements and laboratory experiments. Existing bedform stability diagrams were shown to be valid for bedforms observed in sand- gravel bed rivers and experiments, but new bedform types were identified as well: sand ribbons, barchans and bedload sheets. When the bed surface is armoured, barchans and sand ribbons are dependend on the sediment supply from upstream. This supply is often not predictable from the local hydraulics and sediment characteristics. A predictor for bedload transport of sediment mixtures was developed by extending existing deterministic bedload transport predictors to non-uniform sediment, based on flume experiments reported herein. The near-bed turbulence is modelled stochastically to obtain realistic bedload transport rates at incipient motion. The difference in mobility of small and large grains is represented by hiding-exposure functions. The transport predictor was tested on data from the river Rhine, the Netherlands during a discharge wave in 1998. For the measurements, a new measurement strategy was developed during a discharge wave in 1997, leading to an uncertainty in transport rates of less than 20%. Strong time-lag effects were observed in the field that could not be hindcast by the predictor. Part of the observed hysteresis can be explained by vertical sorting of bedload sediment by the dunes, combined with the time lag between dune height development and the changing flow. A record of vertically sorted sediment is left in the channel bed after a discharge wave, which is the antecedent sorting for the next discharge wave, often called history effect'. The entrainment and deposition depth of the sediment depends on the dune trough level below the average bed level and therefore on the dune height. The vertical sorting is in general fining upward by two processes: by grain flows at the lee side of the dunes, and by grain size-selective entrainment and deposition in the dune troughs (gravel lag deposit). Both processes are studied in detail in additional experiments in both equilibrium and non-equilibrium conditions (discharge events). The implications of these results for modelling are discussed.

Subjects/Keywords: Aardwetenschappen; river; sand; gravel; bedform; sediment transport; sedimentology; sediment sorting; grain flow; flood; bifurcation

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Kleinhans, M. G. (2002). Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/545

Chicago Manual of Style (16^th Edition):

Kleinhans, M G. “Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers.” 2002. Doctoral Dissertation, Universiteit Utrecht. Accessed January 24, 2021. http://dspace.library.uu.nl:8080/handle/1874/545.

MLA Handbook (7^th Edition):

Kleinhans, M G. “Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers.” 2002. Web. 24 Jan 2021.

Vancouver:

Kleinhans MG. Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2002. [cited 2021 Jan 24]. Available from: http://dspace.library.uu.nl:8080/handle/1874/545.

Council of Science Editors:

Kleinhans MG. Sorting out sand and gravel : sediment transport and deposition in sand-gravel bed rivers. [Doctoral Dissertation]. Universiteit Utrecht; 2002. Available from: http://dspace.library.uu.nl:8080/handle/1874/545

9. Prodger, Sam. Spatial and temporal variability of sandy beach sediment grain size and sorting.

Degree: PhD, 2017, University of Plymouth

URL: http://hdl.handle.net/10026.1/9856

► Beach grain size plays a major role in controlling beach slope and sediment transport rates and is a crucial criterion in selecting the appropriate fill… (more)

▼ Beach grain size plays a major role in controlling beach slope and sediment transport rates and is a crucial criterion in selecting the appropriate fill material for beach nourishment. Yet, little is known about how and why beach grain size (and sorting) varies both spatially and temporally on high-energy sandy beaches. Therefore, in this PhD research project, the presence, magnitude and predictability of any spatio-temporal sediment variability was investigated on a number of contrasting high-energy (average significant wave height = 0.8 to 3.5 m), predominantly macrotidal (MSR = 3.1 – 6.2 m), sandy (0.26 – 0.64 mm) beach sites around the southwest peninsula of the United Kingdom (UK). The spatial extent of the data collected ranges from regional (one off snapshot of the sediment conditions on 53 beaches over 485 km of coastline) to local scales (repeated high-resolution samples from across the inter- and subtidal zone of a single high-energy sandy beach; Perranporth, UK). The temporal scales of the sampling ranges from tidal scale (~12 hours) up to monthly (long-term monitoring since 2008). A combination of traditional and modern field data collection methods has provided new insights into the sediment dynamics of sandy beaches. Surface and 0.25 m core sediment samples from the 53 beaches around the southwest UK and high-resolution digital measurements with longer 1 m sand cores from the intertidal zone, plus grab samples from the subtidal zone, at Perranporth, indicated the presence of three quasi-permanent spatial trends. On all sandy beaches, surface sediments became coarser (and better sorted) in the seaward direction across the intertidal zone. Peak sediment sizes were observed on the lower beach around mean low water springs, which were an average 19% coarser (and 8% better sorted) than sediments sampled on the upper intertidal beach. Sediment size (and sorting) also increased (improved) with distance down the sediment column over the top 0.25 m to 1 m. Peak sediment sizes at depth were an average 16% coarser (and 16% better sorted) than surface sediments. In the subtidal zone, surface sediments became finer and poorer sorted with increasing offshore distance. Minimum sediment size occurred on the subtidal bar crest and were an average 21% finer (and 51% poorer sorted) than the lower beach sediments and 5% finer (and 38% poorer sorted) than upper beach sediments. The coarsest sediments were usually the best sorted at all locations. The intertidal coarsening was deterministically linked to the location and amount of breaking wave-induced turbulence. The peak sediment sizes (and sorting) on the lower beach correlated with the location of peak wave dissipation (sediment size to amount of wave dissipation, r2 = 0.86) and the finer sediment sizes on the upper beach and bar were coincident with reduced amounts of wave dissipation in these regions. Long-term seasonal monitoring of the surface sediments at Perranporth indicated a background seasonality, where the winter months were an average 35% coarser and 22%…

Subjects/Keywords: 551.45; Coastal Sediments; Beach Grain Size; Sandy; Beach Sediment Sorting; Wave Dissipation

…x28;Submitted). Systematic Changes in Beach Sediment Grain Size and Sorting… …123 CHAPTER 4 TEMPORAL VARIABILITY IN GRAIN SIZE AND SORTING ... 125 4.1 INTRODUCTION… …250 8.3 SYSTEMATIC CHANGES IN GRAIN SIZE AND SORTING… …grain size was 0.970 and 0.956 for sorting, with a 95% confidence interval of the digital… …samples compared to the settling tube of 0.0084 mm for grain size and 0.0064 mm for sorting…

11 more images…

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Prodger, S. (2017). Spatial and temporal variability of sandy beach sediment grain size and sorting. (Doctoral Dissertation). University of Plymouth. Retrieved from http://hdl.handle.net/10026.1/9856

Chicago Manual of Style (16^th Edition):

Prodger, Sam. “Spatial and temporal variability of sandy beach sediment grain size and sorting.” 2017. Doctoral Dissertation, University of Plymouth. Accessed January 24, 2021. http://hdl.handle.net/10026.1/9856.

MLA Handbook (7^th Edition):

Prodger, Sam. “Spatial and temporal variability of sandy beach sediment grain size and sorting.” 2017. Web. 24 Jan 2021.

Vancouver:

Prodger S. Spatial and temporal variability of sandy beach sediment grain size and sorting. [Internet] [Doctoral dissertation]. University of Plymouth; 2017. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10026.1/9856.

Council of Science Editors:

Prodger S. Spatial and temporal variability of sandy beach sediment grain size and sorting. [Doctoral Dissertation]. University of Plymouth; 2017. Available from: http://hdl.handle.net/10026.1/9856

Universiteit Utrecht

10. Walgreen, M. Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting.

Degree: 2003, Universiteit Utrecht

URL: http://dspace.library.uu.nl:8080/handle/1874/703

► The work presented in this thesis concerns the dynamics of shoreface-connected ridges and tidal sand ridges. These large-scale bedforms are observed on the inner and… (more)

▼ The work presented in this thesis concerns the dynamics of shoreface-connected ridges and tidal sand ridges. These large-scale bedforms are observed on the inner and outer shelf of coastal seas in water depths of 10-20m. The motivation of this work is to improve the understanding of the mechanisms related to their formation and the processes that determine their main characteristics. This is done with the use of idealised morphodynamic models. The basic assumption underlying these models is that large-scale sand ridges can solely form as free instabilities on a flat sea bottom. Mathematical methods based on a stability analysis are applied, whereas analytical and numerical methods are used to solve the equations. Existing models are extended with new physical processes, in particular including the role of grain sorting. An important part of this thesis concerns the unresolved question about the origin of the observed mean grain size pattern over the ridges. It explores the hydrodynamic processes that can lead to sediment sorting and the formation of large-scale sand ridges. The model results indicate that the dynamics for different forcing conditions strongly differ. Shoreface-connected sand ridges mainly form during storm conditions, whereas if fair weather conditions prevail the more offshore located tidal sand ridges develop. A probabilistic formulation of these two realisation of the model is used to find conditions for which both types of large-scale bedforms occur simultaneously, as is the case in the southern North Sea. These conditions turn out to be a low storm fraction and the presence of both tidal and storm-driven currents. The transport of non-uniform sediment is described by formulations for both bed load and suspended load, both of which account for dynamic hiding effects. A one-layer model for the bed evolution is used and two grain size classes (fine and coarse sand) are considered. The results of the model for storm conditions indicate that the observed phase shift between bed topography and mean grain size for shoreface-connected ridges (finest sand on seaward flanks) is due to the selective transport via suspended load of grains with different sizes. Parameter values are based on the sand ridges along the Atlantic coast of North America. A net stabilising effect on the initial growth and an enhanced migration is predicted. A physical explanation for the model results is given. During fair weather or tidally dominated conditions, when bed load transport of sediment is dominant, the results indicate an increase in initial growth and migration rates of tidal sand ridges for a bimodal sediment mixture. A symmetrical tidal current results in a grain size distribution, with the coarsest sand found at the crest of the ridges. Results are compared with the tidal ridges on the Belgian coastal shelf. The investigation of the long-term evolution of shoreface-connected ridges focuses on storm-dominated micro-tidal shelves. It is shown that, starting from an initial state without bedforms, a pattern…

Subjects/Keywords: Natuur- en Sterrenkunde; shoreface-connected sand ridges; tidal sand ridges; coastal shelf; morphodynamic model; stability analysis; sediment transport; nonuniform sediment; grain sorting; storm-driven current; tidal current

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Walgreen, M. (2003). Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting. (Doctoral Dissertation). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/703

Chicago Manual of Style (16^th Edition):

Walgreen, M. “Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting.” 2003. Doctoral Dissertation, Universiteit Utrecht. Accessed January 24, 2021. http://dspace.library.uu.nl:8080/handle/1874/703.

MLA Handbook (7^th Edition):

Walgreen, M. “Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting.” 2003. Web. 24 Jan 2021.

Vancouver:

Walgreen M. Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting. [Internet] [Doctoral dissertation]. Universiteit Utrecht; 2003. [cited 2021 Jan 24]. Available from: http://dspace.library.uu.nl:8080/handle/1874/703.

Council of Science Editors:

Walgreen M. Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting. [Doctoral Dissertation]. Universiteit Utrecht; 2003. Available from: http://dspace.library.uu.nl:8080/handle/1874/703

11. Frings, R.M. From gravel to sand. Downstream fining of bed sediments in the lower river Rhine.

Degree: 2007, University Utrecht

URL: https://dspace.library.uu.nl/handle/1874/25920 ; URN:NBN:NL:UI:10-1874-25920 ; 1874/25920 ; urn:isbn:9789068094107 ; URN:NBN:NL:UI:10-1874-25920 ; https://dspace.library.uu.nl/handle/1874/25920

► A common characteristic of many rivers is the tendency for bed sediments to become finer in downstream direction. This phenomenon, which is generally known as… (more)

▼ A common characteristic of many rivers is the tendency for bed sediments to become finer in downstream direction. This phenomenon, which is generally known as downstream fining, has a strong effect on the morphologic and hydrodynamic behaviour of a river. The fundamental causes of downstream fining are abrasion (the progressive breakdown of particles during their downstream transport) and selective transport (the preferential downstream transport of fine particles), but the effects of these processes are sometimes overshadowed by the external addition of sediment to the river (e.g. at tributary confluences), or by the extraction of sediment from the channel (e.g. by dredging). The intensity of abrasion, selective transport and sediment addition-extraction processes is determined by external controls, such as climate, tectonics and human impact. The downstream fining rate that is observed in a river thus is a function of: (1) abrasion and selective transport, (2) sediment addition-extraction processes, and (3) external controls. Laboratory and field studies have greatly elucidated the effects of these processes and controls on downstream fining in gravel-bed rivers, but considerably less attention has been paid to downstream fining in sand-bed rivers and to the abrupt transition from a gravel-bed river to a sand-bed river. The general objective of this thesis was to determine the influence of abrasion, selective transport, sediment addition-extraction processes and external controls on downstream fining in sand-bed rivers and gravel-sand transition zones. The focus of the thesis is on large, alluvial, meandering, lowland rivers, such as the downstream reaches of the Ganges, Rhine, Mississippi and Niger. The lower river Rhine served as study case. To meet the general research objective, different approaches were followed. First, an extensive literature review was done in order to identify all relevant processes and controls. Second, a large data set of sediment transport measurements was analysed to study selective transport processes and an important addition-extraction process: the complex sediment distribution at river bifurcations. Third, geological, historical and modern data were combined to study the external control of human interference on downstream fining. Fourth, a porosity model was developed to determine how the bed structure of a river changes in downstream direction. Fifth, the porosity model was combined with sedimentological data to estimate the effect of bed structure and sediment sorting on the transport selectivity in gravel-sand transition zones. Finally, a numerical downstream fining model was constructed in order to determine the interactions between selective transport processes, addition-extraction processes and external controls on downstream fining. With respect to sand-bed rivers, it was found that the intrinsic cause of downstream fining is selective transport, which takes place during bed-load transport and suspended load transport, and is strongly enhanced by sorting…

Subjects/Keywords: river morphology; river bifurcations; grain size; downstream fining; gravel-sand transition; sediment sorting; sediment transport; selective transport; porosity; bed forms; wash load; Rhine; human impact; numerical model

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Frings, R. M. (2007). From gravel to sand. Downstream fining of bed sediments in the lower river Rhine. (Doctoral Dissertation). University Utrecht. Retrieved from https://dspace.library.uu.nl/handle/1874/25920 ; URN:NBN:NL:UI:10-1874-25920 ; 1874/25920 ; urn:isbn:9789068094107 ; URN:NBN:NL:UI:10-1874-25920 ; https://dspace.library.uu.nl/handle/1874/25920

Chicago Manual of Style (16^th Edition):

Frings, R M. “From gravel to sand. Downstream fining of bed sediments in the lower river Rhine.” 2007. Doctoral Dissertation, University Utrecht. Accessed January 24, 2021. https://dspace.library.uu.nl/handle/1874/25920 ; URN:NBN:NL:UI:10-1874-25920 ; 1874/25920 ; urn:isbn:9789068094107 ; URN:NBN:NL:UI:10-1874-25920 ; https://dspace.library.uu.nl/handle/1874/25920.

MLA Handbook (7^th Edition):

Frings, R M. “From gravel to sand. Downstream fining of bed sediments in the lower river Rhine.” 2007. Web. 24 Jan 2021.

Vancouver:

Frings RM. From gravel to sand. Downstream fining of bed sediments in the lower river Rhine. [Internet] [Doctoral dissertation]. University Utrecht; 2007. [cited 2021 Jan 24]. Available from: https://dspace.library.uu.nl/handle/1874/25920 ; URN:NBN:NL:UI:10-1874-25920 ; 1874/25920 ; urn:isbn:9789068094107 ; URN:NBN:NL:UI:10-1874-25920 ; https://dspace.library.uu.nl/handle/1874/25920.

Council of Science Editors:

Frings RM. From gravel to sand. Downstream fining of bed sediments in the lower river Rhine. [Doctoral Dissertation]. University Utrecht; 2007. Available from: https://dspace.library.uu.nl/handle/1874/25920 ; URN:NBN:NL:UI:10-1874-25920 ; 1874/25920 ; urn:isbn:9789068094107 ; URN:NBN:NL:UI:10-1874-25920 ; https://dspace.library.uu.nl/handle/1874/25920

12. Walgreen, M. Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting.

Degree: 2003, University Utrecht

URL: https://dspace.library.uu.nl/handle/1874/703 ; URN:NBN:NL:UI:10-1874-703 ; 1874/703 ; URN:NBN:NL:UI:10-1874-703 ; https://dspace.library.uu.nl/handle/1874/703

► The work presented in this thesis concerns the dynamics of shoreface-connected ridges and tidal sand ridges. These large-scale bedforms are observed on the inner and… (more)

▼ The work presented in this thesis concerns the dynamics of shoreface-connected ridges and tidal sand ridges. These large-scale bedforms are observed on the inner and outer shelf of coastal seas in water depths of 10-20m. The motivation of this work is to improve the understanding of the mechanisms related to their formation and the processes that determine their main characteristics. This is done with the use of idealised morphodynamic models. The basic assumption underlying these models is that large-scale sand ridges can solely form as free instabilities on a flat sea bottom. Mathematical methods based on a stability analysis are applied, whereas analytical and numerical methods are used to solve the equations. Existing models are extended with new physical processes, in particular including the role of grain sorting. An important part of this thesis concerns the unresolved question about the origin of the observed mean grain size pattern over the ridges. It explores the hydrodynamic processes that can lead to sediment sorting and the formation of large-scale sand ridges. The model results indicate that the dynamics for different forcing conditions strongly differ. Shoreface-connected sand ridges mainly form during storm conditions, whereas if fair weather conditions prevail the more offshore located tidal sand ridges develop. A probabilistic formulation of these two realisation of the model is used to find conditions for which both types of large-scale bedforms occur simultaneously, as is the case in the southern North Sea. These conditions turn out to be a low storm fraction and the presence of both tidal and storm-driven currents. The transport of non-uniform sediment is described by formulations for both bed load and suspended load, both of which account for dynamic hiding effects. A one-layer model for the bed evolution is used and two grain size classes (fine and coarse sand) are considered. The results of the model for storm conditions indicate that the observed phase shift between bed topography and mean grain size for shoreface-connected ridges (finest sand on seaward flanks) is due to the selective transport via suspended load of grains with different sizes. Parameter values are based on the sand ridges along the Atlantic coast of North America. A net stabilising effect on the initial growth and an enhanced migration is predicted. A physical explanation for the model results is given. During fair weather or tidally dominated conditions, when bed load transport of sediment is dominant, the results indicate an increase in initial growth and migration rates of tidal sand ridges for a bimodal sediment mixture. A symmetrical tidal current results in a grain size distribution, with the coarsest sand found at the crest of the ridges. Results are compared with the tidal ridges on the Belgian coastal shelf. The investigation of the long-term evolution of shoreface-connected ridges focuses on storm-dominated micro-tidal shelves. It is shown that, starting from an initial state without bedforms, a pattern…

Subjects/Keywords: shoreface-connected sand ridges; tidal sand ridges; coastal shelf; morphodynamic model; stability analysis; sediment transport; nonuniform sediment; grain sorting; storm-driven current; tidal current

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Walgreen, M. (2003). Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting. (Doctoral Dissertation). University Utrecht. Retrieved from https://dspace.library.uu.nl/handle/1874/703 ; URN:NBN:NL:UI:10-1874-703 ; 1874/703 ; URN:NBN:NL:UI:10-1874-703 ; https://dspace.library.uu.nl/handle/1874/703

Chicago Manual of Style (16^th Edition):

Walgreen, M. “Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting.” 2003. Doctoral Dissertation, University Utrecht. Accessed January 24, 2021. https://dspace.library.uu.nl/handle/1874/703 ; URN:NBN:NL:UI:10-1874-703 ; 1874/703 ; URN:NBN:NL:UI:10-1874-703 ; https://dspace.library.uu.nl/handle/1874/703.

MLA Handbook (7^th Edition):

Walgreen, M. “Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting.” 2003. Web. 24 Jan 2021.

Vancouver:

Walgreen M. Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting. [Internet] [Doctoral dissertation]. University Utrecht; 2003. [cited 2021 Jan 24]. Available from: https://dspace.library.uu.nl/handle/1874/703 ; URN:NBN:NL:UI:10-1874-703 ; 1874/703 ; URN:NBN:NL:UI:10-1874-703 ; https://dspace.library.uu.nl/handle/1874/703.

Council of Science Editors:

Walgreen M. Dynamics of sand ridges in coastal seas: the effect of storms, tides and grain sorting. [Doctoral Dissertation]. University Utrecht; 2003. Available from: https://dspace.library.uu.nl/handle/1874/703 ; URN:NBN:NL:UI:10-1874-703 ; 1874/703 ; URN:NBN:NL:UI:10-1874-703 ; https://dspace.library.uu.nl/handle/1874/703

13. Williams, Randolph T. A Combined Experimental and Numerical Approach to Understanding Quartz Cementation in Sandstones.

Degree: MS, Geology, 2012, Bowling Green State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339354653

► Quartz cement formed during diagenesis is the principle cause of porosity and permeability reduction in sandstones and therefore greatly affects reservoir quality. Predictive quartz cement… (more)

Subjects/Keywords: Geology; sandstone; geology; geochemistry; quartz; quartz cement; diagenesis; structural diagenesis; structural geology; hydrothermal; experimental geology; hydrocarbon; reservoir; grain size; sorting; porosity; permeability

…differences in grain size and sorting) conditions is necessary to further improve predictive… …the effect of grain size and sorting on the rate of quartz cementation and corresponding… …properties of sandstones change during diagenesis, the specific effects of grain size and sorting… …the effect of grain size and sorting on pore space evolution during sandstone cementation… …viii 16 The number of pores per unit area in coarse, fine, and mixed grain size…

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APA (6^th Edition):

Williams, R. T. (2012). A Combined Experimental and Numerical Approach to Understanding Quartz Cementation in Sandstones. (Masters Thesis). Bowling Green State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339354653

Chicago Manual of Style (16^th Edition):

Williams, Randolph T. “A Combined Experimental and Numerical Approach to Understanding Quartz Cementation in Sandstones.” 2012. Masters Thesis, Bowling Green State University. Accessed January 24, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339354653.

MLA Handbook (7^th Edition):

Williams, Randolph T. “A Combined Experimental and Numerical Approach to Understanding Quartz Cementation in Sandstones.” 2012. Web. 24 Jan 2021.

Vancouver:

Williams RT. A Combined Experimental and Numerical Approach to Understanding Quartz Cementation in Sandstones. [Internet] [Masters thesis]. Bowling Green State University; 2012. [cited 2021 Jan 24]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339354653.

Council of Science Editors:

Williams RT. A Combined Experimental and Numerical Approach to Understanding Quartz Cementation in Sandstones. [Masters Thesis]. Bowling Green State University; 2012. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339354653

14. Srisuwan, Chatchawin. Size-selective sediment transport and cross-shore profile evolution in the nearshore zone.

Degree: PhD, Civil and Environmental Engineering, 2012, Georgia Tech

URL: http://hdl.handle.net/1853/45892

► Cross-shore bathymetric evolution in the nearshore zone often leads to threatening consequences such as beach erosion and shoreline retreat that concern the coastal community. A… (more)

▼ Cross-shore bathymetric evolution in the nearshore zone often leads to threatening consequences such as beach erosion and shoreline retreat that concern the coastal community. A new, comprehensive cross-shore morphodynamic model was developed that can be used to describe and predict these phenomena. The study included both physical and numerical models that were designed to focus on the influence of sediment size characteristics on the cross-shore sediment transport process. For a profile equilibrium timescale, three types of beach profiles with different sediment mixtures were simulated in a small-scale, random-wave flume laboratory using erosive, storm, and accretive wave conditions. Dynamic relationships between the sediment grain sorting and beach profile changes were found to be evident as size-graded sediment fractions tended to relocate to different energetic zones along the cross-shore profiles. Existing phase-averaged wave and circulation models were utilized together with several new intra-wave modules for predicting important hydrodynamic parameters that were validated using the experimental data. A novel, multi-size sediment transport model was formulated to compute individual transport rates of size-graded sediment fractions while accounting for their interaction and non-linear size dependencies. The model was coupled with a new grain sorting model that resolves cross-shore grain sorting and vertical grain lamination. Compared to a traditional modeling approach, the new comprehensive model proved to offer superior modeling accuracy for both profile evolution and sediment grain size change. The use of the model is most advantageous for a condition with intensive grain sorting, a common scenario on a natural beach profile. Equilibrium beach profile is also better simulated by the model as size-graded fractions are predicted to relocate to different zones where they could withstand local hydrodynamics. Other new components that also help improve the modeling capability include the terms for wave-breaking and bed-slope effects, wave-crest sediment flux, and acceleration-induced bottom-shear stress. Besides superior profile modeling accuracy, sediment size characteristics and their spatial and temporal variations are also a useful set of information provided by the new model. Advisors/Committee Members: Paul A Work (Committee Chair), Emanuele Di Lorenzo (Committee Member), Hermann M Fritz (Committee Member), J David Frost (Committee Member), Kevin A Haas (Committee Member).

Subjects/Keywords: Nearshore morphodynamics; Cross-shore profile evolution; Beach profile model; Sediment grain sorting; Wave flume experiment; Size-selective sediment transport; Equilibrium beach profile; Coastal sediments; Sediment transport; Erosion; Beach erosion

…grain sorting and their major roles in the process simulations. 95 Changes in net sediment… …grid utilized in the grain sorting model. Overview of three sediment portions and associated… …parameters in the erosion stage of the grain sorting computation… …grain sorting computation. . . . . . . . . . . . . . . Size-selectivity trend in the potential… …approaches. . . . . . . . Symmetrical sandbar assumed in the test of the grain sorting model…

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APA (6^th Edition):

Srisuwan, C. (2012). Size-selective sediment transport and cross-shore profile evolution in the nearshore zone. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/45892

Chicago Manual of Style (16^th Edition):

Srisuwan, Chatchawin. “Size-selective sediment transport and cross-shore profile evolution in the nearshore zone.” 2012. Doctoral Dissertation, Georgia Tech. Accessed January 24, 2021. http://hdl.handle.net/1853/45892.

MLA Handbook (7^th Edition):

Srisuwan, Chatchawin. “Size-selective sediment transport and cross-shore profile evolution in the nearshore zone.” 2012. Web. 24 Jan 2021.

Vancouver:

Srisuwan C. Size-selective sediment transport and cross-shore profile evolution in the nearshore zone. [Internet] [Doctoral dissertation]. Georgia Tech; 2012. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1853/45892.

Council of Science Editors:

Srisuwan C. Size-selective sediment transport and cross-shore profile evolution in the nearshore zone. [Doctoral Dissertation]. Georgia Tech; 2012. Available from: http://hdl.handle.net/1853/45892

15. ΒΟΥΤΣΙΝΟΥ-ΤΑΛΙΑΔΟΥΡΗ, ΦΑΝΗ. ΓΕΩΧΗΜΙΚΗ ΜΕΛΕΤΗ ΙΖΗΜΑΤΩΝ ΑΠΟ ΤΟΝ ΕΥΒΟΙΚΟ ΚΟΛΠΟ.

Degree: 1988, Πανεπιστήμιο Πατρών; University of Patras

URL: http://hdl.handle.net/10442/hedi/0872

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AN FE-CR-NI DEPOSIT IS DESCRIBED FROM THE NORTHERN EUBOIKOS GULF, GREECE, FORMED BY THE CONTINUOUS 14-YEAR DISCHARGE OF ENORMOUS AMOUNT OF HEAVILY METAL-RICH SLAG FROM… (more)

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AN FE-CR-NI DEPOSIT IS DESCRIBED FROM THE NORTHERN EUBOIKOS GULF, GREECE, FORMED BY THE CONTINUOUS 14-YEAR DISCHARGE OF ENORMOUS AMOUNT OF HEAVILY METAL-RICH SLAG FROM AN FE-NI ALLOY SMELTING PLANT (LARKO A.E.). THIS DEPOSIT COVERS AN AREA OF ABOUT 45 KM2. IT HAS AN ELLIPSOIDAL SHAPE WITH ITS LONG AXIS ORIENTED ROUGHLY AT A NORTH-SOUTH DIRECTION. IT CONSISTS OF LOOSE UNCOSOLIDATED SAND-SIZE METALLIFEROUS SEDIMENT WITH MEAN SPECIFIC GRAVITY OF 3.6 G/CM3. THE ENRICHMENT FACTORS ARE 20 FOR CR, 18 FOR NI, 13 FOR FE AND 8 FOR PB. THE VOLUME OF THE MEANORE BODY IS ABOUT 2 127 414 M3. IT IS ESTIMATED THAT IT CONTAINS AT LEAST 1 455 705 TONS OF FE2O3, 49835 TONS OF CR2O3, 3 264 TONS OF NI, 222 TONS OF CO AND5 468 TONS OF MN. THE DEPOSIT HAD BEEN FORMED BY THE CONTINUOUS DISCHARGE OF SLAG FROM THE SMELTING PLANT AND ITS SUBSEQUENT LEACHING BY SEAWATER, WHICH RESULTED IN A PARTIAL REMOVAL OF AL, MG AND CA AND A FURTHER ENRICHMENT IN FE, CR, NI AND CO. SURFACE SEDIMENTS NEAR THE LARKO FACTORY ARE ENRICHED BY THE DOMESTIC WASTES IN ZN, CU AND PB, BESIDES FE, CR, NI AND CO. HIGH SEDIMENT CONCENTRATIONS IN NI, CR AND MN NEAR THE COASTS OF EUBOEA ARE PROBABLY CAUSED BY THE WEATHERING OF MAFIC AND ULTRAMAFIC ROCKS, WHILE THOSE OF FE, CR, NI, CO AND ZN AND PB IN LEICHADES ISLANDS MAY BE CAUSED BY THE WEATHERING OF VULCANIC ROCKS. LASTLY, HIGH SEDIMENT CONCENTRATIONS OF FE, CU, ZN AND MN AT THE MOUTH OF THE SPERCHIOS RIVER RESULTS FROM THE ALLUVIAL DEPOSITION.

ΣΤΟ ΒΟΡΕΙΟ ΕΥΒΟΙΚΟ ΚΟΛΠΟ ΠΡΑΓΜΑΤΟΠΟΙΕΙΤΑΙ ΑΠΟ ΤΟ 1969 ΑΠΟΡΡΙΨΗ ΜΕΤΑΛΛΟΥΡΓΙΚΗΣ ΣΚΩΡΙΑΣ ΑΠΟ ΤΟ ΕΡΓΟΣΤΑΣΙΟ ΠΑΡΑΣΚΕΥΗΣ ΣΙΔΗΡΟΝΙΚΕΛΙΟΥ ΛΑΡΚΟ ΑΕ, ΜΕ ΑΠΟΤΕΛΕΣΜΑ ΤΗ ΔΗΜΙΟΥΡΓΙΑ ΕΝΟΣ ΠΛΟΥΣΙΟΥ ΣΕ FE, CR, MN ΑΠΟΘΕΜΑΤΟΣ. ΤΟ ΑΠΟΘΕΜΑ ΑΥΤΟ ΚΑΛΥΠΤΕΙ ΜΙΑ ΘΑΛΑΣΣΙΑ ΕΚΤΑΣΗ ΠΕΡΙΠΟΥ 45 ΚΜ2. ΕΧΕΙ ΣΧΗΜΑ ΕΛΛΕΙΨΟΕΙΔΕΣ ΜΕ ΤΟΝ ΚΥΡΙΟ ΑΞΟΝΑ ΤΗΣ ΕΛΛΕΙΨΗΣ ΣΕ ΜΙΑ Β-Ν ΔΙΕΥΘΥΝΣΗ. ΑΠΟΤΕΛΕΙΤΑΙ ΑΠΟ ΧΑΛΑΡΑ ΣΥΝΔΕΔΕΜΕΝΟ ΜΕΤΑΛΛΟΦΟΡΟ ΙΖΗΜΑ ΜΕΓΕΘΟΥΣ ΚΟΚΚΩΝ ΑΥΤΟ ΤΗΣ ΑΜΜΟΥ ΚΑΙ ΜΕΣΟ ΕΙΔΙΚΟ ΒΑΡΟΣ 3,6 G/CM 3. ΟΙ ΣΥΝΤΕΛΕΣΤΕΣ ΕΠΙΒΑΡΥΝΣΗΣ ΕΙΝΑΙ ΓΙΑ ΤΟ CR 20, ΤΟ NI 18 ΤΟ FE 13 ΚΑΙ ΤΟ PB 8. Ο ΟΓΚΟΣ ΤΟΥ ΚΥΡΙΩΣ ΑΠΟΘΕΜΑΤΟΣ ΕΙΝΑΙ ΠΕΡΙΠΟΥ 2 127 414 Μ3. ΕΚΤΙΜΑΤΑΙ ΟΤΙ ΠΕΡΙΕΧΕΙ ΤΟΥΛΑΧΙΣΤΟΝ 1 455 705 ΤΟΝΝΟΥΣ FE2O3, 49 835 TONNOYS CR203, 3 264 ΤΟΝΝΟΥΣ ΝΙ, 222 ΤΟΝΝΟΥΣ CO ΚΑΙ 5 468 ΤΟΝΝΟΥΣ ΜΝ. ΤΟ ΑΠΟΘΕΜΑ ΔΗΜΙΟΥΡΓΕΙΤΑΙ ΑΠΟ ΤΗΝ ΣΥΝΕΧΗ ΑΠΟΡΡΙΨΗ ΜΕΤΑΛΛΟΥΡΓΙΚΗΣ ΣΚΩΡΙΑΣ ΚΑΙ ΤΗ ΔΙΑΒΡΩΣΗ ΤΗΣ ΑΠΟ ΤΟ ΘΑΛΑΣΣΙΝΟ ΝΕΡΟ ΠΟΥ ΑΚΟΛΟΥΘΕΙ, ΜΕΑΠΟΤΕΛΕΣΜΑ ΤΗ ΜΕΡΙΚΗ ΑΠΟΜΑΚΡΥΝΣΗ ΤΩΝ AL, MG ΚΑΙ CA ΚΑΙ ΤΟΝ ΠΕΡΑΙΤΕΡΩ ΕΜΠΛΟΥΤΙΣΜΟ ΣΕ FE, CR, NI KAI CO. Η ΠΕΡΙΟΧΗ ΠΟΥ ΒΡΙΣΚΕΤΑΙ ΤΟ ΕΡΓΟΣΤΑΣΙΟ ΤΗΣ ΛΑΡΚΟ ΕΠΙΒΑΡΥΝΕΤΑΙ ΕΚΤΟΣ ΑΠΟ ΤΑ ΣΤΟΙΧΕΙΑ FE, CR, NI, CO, ΚΑΙ ΜΕ ΤΑ ΜΕΤΑΛΛΑ ZN, CU, PB ΤΩΝ ΛΥΜΑΤΩΝ ΤΟΥ ΟΙΚΙΣΜΟΥ ΤΗΣ ΛΑΡΥΜΝΑΣ. Ο ΕΜΠΛΟΥΤΙΣΜΟΣ ΣΕ NI, CR, MN ΤΗΣ ΘΑΛΑΣΣΙΑΣ ΠΕΡΙΟΧΗΣ ΚΟΝΤΑ ΣΤΙΣ ΑΚΤΕΣ ΤΗΣ ΕΥΒΟΙΑΣ ΕΙΝΑΙ ΠΙΘΑΝΩΣ ΤΟ ΑΠΟΤΕΛΕΣΜΑ ΕΞΑΛΛΟΙΩΣΗΣ ΒΑΣΙΚΩΝ ΚΑΙ ΥΠΕΡΒΑΣΙΚΩΝ ΠΕΤΡΩΜΑΤΩΝ, ΟΙ ΥΨΗΛΕΣ ΣΥΓΚΕΝΤΡΩΣΕΙΣ ΤΩΝ FE, CR, NI, CO, ZNΣΤΟΝ ΚΟΛΠΟ ΤΗΣ ΑΙΔΗΨΟΥ ΟΦΕΙΛΟΝΤΑΙ ΠΙΘΑΝΩΣ ΣΤΗΝ ΑΠΕΛΕΥΘΕΡΩΣΗ ΑΥΤΩΝ ΤΩΝ ΜΕΤΑΛΛΩΝΑΠΟ ΘΕΡΜΑ ΙΑΜΑΤΙΚΑ ΝΕΡΑ, ΟΙ ΥΨΗΛΕΣ ΣΥΓΚΕΝΤΡΩΣΕΙΣ ΤΩΝ CR, MN, ZN, PB ΣΤΙΣ ΛΕΙΧΑΔΕΣ ΝΗΣΟΥΣ ΟΦΕΙΛΟΝΤΑΙ ΠΙΘΑΝΩΣ ΣΤΗΝ ΕΞΑΛΛΟΙΩΣΗ ΗΦΑΙΣΤΕΙΟΓΕΝΩΝ ΠΕΤΡΩΜΑΤΩΝ ΚΑΙ ΤΕΛΟΣ ΟΙ ΑΥΞΗΜΕΝΕΣ…

Subjects/Keywords: Deposit; ELEMENTS: FE, AL, CR, NI, CO, MN, ZN, CU, PB; GRANULOMETRIC ANALYSIS; Marine sediments; MEAN GRAIN SIZE; NORTH EUBOIKOS GULF, GREECE; POLLUTION RATIO; SELECTIVE FRACTIONATION; SLAG; SORTING; Αποθέματα; ΒΟΡΕΙΟΣ ΕΥΒΟΙΚΟΣ ΚΟΛΠΟΣ; ΔΙΑΒΑΘΜΙΣΗ; ΕΚΛΕΚΤΙΚΟΣ ΔΙΑΧΩΡΙΣΜΟΣ; Θαλάσσια ιζήματα; ΚΟΚΚΟΜΕΤΡΙΚΗ ΑΝΑΛΥΣΗ; ΜΕΣΟ ΜΕΓΕΘΟΣ ΚΟΚΚΩΝ; ΜΕΤΑΛΛΟΥΡΓΙΚΗ ΣΚΩΡΙΑ; ΣΤΟΙΧΕΙΑ: FE, AL, CR, NI, CO, MN, ZN, CU, PB; ΣΥΝΤΕΛΕΣΤΗΣ ΕΠΙΒΑΡΥΝΣΗΣ

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

ΒΟΥΤΣΙΝΟΥ-ΤΑΛΙΑΔΟΥΡΗ, �. (1988). ΓΕΩΧΗΜΙΚΗ ΜΕΛΕΤΗ ΙΖΗΜΑΤΩΝ ΑΠΟ ΤΟΝ ΕΥΒΟΙΚΟ ΚΟΛΠΟ. (Thesis). Πανεπιστήμιο Πατρών; University of Patras. Retrieved from http://hdl.handle.net/10442/hedi/0872

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

ΒΟΥΤΣΙΝΟΥ-ΤΑΛΙΑΔΟΥΡΗ, ΦΑΝΗ. “ΓΕΩΧΗΜΙΚΗ ΜΕΛΕΤΗ ΙΖΗΜΑΤΩΝ ΑΠΟ ΤΟΝ ΕΥΒΟΙΚΟ ΚΟΛΠΟ.” 1988. Thesis, Πανεπιστήμιο Πατρών; University of Patras. Accessed January 24, 2021. http://hdl.handle.net/10442/hedi/0872.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

ΒΟΥΤΣΙΝΟΥ-ΤΑΛΙΑΔΟΥΡΗ, ΦΑΝΗ. “ΓΕΩΧΗΜΙΚΗ ΜΕΛΕΤΗ ΙΖΗΜΑΤΩΝ ΑΠΟ ΤΟΝ ΕΥΒΟΙΚΟ ΚΟΛΠΟ.” 1988. Web. 24 Jan 2021.

Vancouver:

ΒΟΥΤΣΙΝΟΥ-ΤΑΛΙΑΔΟΥΡΗ �. ΓΕΩΧΗΜΙΚΗ ΜΕΛΕΤΗ ΙΖΗΜΑΤΩΝ ΑΠΟ ΤΟΝ ΕΥΒΟΙΚΟ ΚΟΛΠΟ. [Internet] [Thesis]. Πανεπιστήμιο Πατρών; University of Patras; 1988. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10442/hedi/0872.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

ΒΟΥΤΣΙΝΟΥ-ΤΑΛΙΑΔΟΥΡΗ �. ΓΕΩΧΗΜΙΚΗ ΜΕΛΕΤΗ ΙΖΗΜΑΤΩΝ ΑΠΟ ΤΟΝ ΕΥΒΟΙΚΟ ΚΟΛΠΟ. [Thesis]. Πανεπιστήμιο Πατρών; University of Patras; 1988. Available from: http://hdl.handle.net/10442/hedi/0872

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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