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Tesi sul tema "Mixing in lakes"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 11 febbraio 2022

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1

Yeates, Peter Stafford. "Deep mixing in stratified lakes and reservoirs." University of Western Australia. Centre for Water Research, 2008. http://theses.library.uwa.edu.au/adt-WU2008.0046.

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Abstract (sommario):

The onset of summer stratification in temperate lakes and reservoirs forces a decoupling of the hypolimnion from the epilimnion that is sustained by strong density gradients in the metalimnion. These strong gradients act as a barrier to the vertical transport of mass and scalars leading to bottom anoxia and subsequent nutrient release from the sediments. The stratification is intermittently overcome by turbulent mixing events that redistribute mass, heat, dissolved parameters and particulates in the vertical. The redistribution of ecological parameters then exerts some control over the ecologi

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2

Matthews, Paul Charles. "Convection and mixing on ice-covered lakes." Thesis, University of Cambridge, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304299.

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3

Allan, Craig James. "Lake ice cover development and meltwater mixing in the spring acidification of small Canadian Precambrian Shield lakes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1987. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq21669.pdf.

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4

Holzner, Christian Peter. "Noble gases as tracers for mixing and gas exchange processes in lakes and oceans /." Zürich : ETH, 2008. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=17757.

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5

Edwards, William J. "Impacts of the Zebra Mussel (Dreissena Polymorpha) on Large Lakes: Influence of Vertical Turbulent Mixing." The Ohio State University, 2002. http://rave.ohiolink.edu/etdc/view?acc_num=osu1392139735.

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6

Myers, Justin Adam. "Internal loading of nitrogen (N) and phosphorus (P), reduced N forms, and periodic mixing support cyanobacterial harmful algal blooms (HABs) in shallow, eutrophic Honeoye Lake (New York, USA)." Wright State University / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=wright1622556045440146.

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7

Blottiere, Lydie. "Rôles du brassage dans le fonctionnement des écosystèmes aquatiques peu profonds dans un contexte de réchauffement climatique." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS016/document.

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Le vent joue un rôle clé dans la structure et le fonctionnement des lacs. Le brassage de la colonne d’eau est notamment impliqué dans la compétition entre les différentes espèces de phytoplancton dont les stratégies de positionnement vertical varient largement entre groupes. Par exemple, les cyanobactéries sont globalement favorisées par des conditions de brassage faible grâce à des mécanismes physiologiques de flottaison leur permettant de se maintenir à une profondeur désirée, alors que les diatomées et les algues vertes qui n’ont pas de système de flottaison dépendent d’un brassage importan

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8

Huber, Anita. "Internal mixing in a mine lake." University of Western Australia. School of Environmental Systems Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0103.

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[Truncated abstract] Mine lakes are a water body created after an open-cut mine ceases operating. The lakes develop in the former mine-pit due to the combination of groundwater inflow, surface run-off and, in some cases, due to rapid filling from river diversion. While potentially valuable water resources, these lakes often have poor water quality and managing the water body is an important part of the overall process of mine site rehabilitation. As mine lakes form in man-made pits, they have a bathymetry that is typically quite distinct from natural lakes and this can, in turn, strongly influ

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9

Huber, Anita. "Internal mixing in a mine lake /." Connect to this title, 2006. http://theses.library.uwa.edu.au/adt-WU2007.0103.

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10

Carse, Fiona. "Lake and ocean vertical mixing using sulphur hexafluoride tracer techniques." Thesis, University of East Anglia, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327480.

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11

Zhang, Shuimin. "Dynamics of vertical mixing in lake Geneva : overturning scales and energetics /." Lausanne : [s.n.], 1994. http://library.epfl.ch/theses/?nr=1254.

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12

McGinnis, Daniel Frank. "Two-Dimensional Lake and Reservoir Modeling: Natural and Plume-Induced Mixing Mechanisms." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/29395.

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Abstract (sommario):

Lakes and reservoirs exhibit a number of mixing and transport mechanisms. Understanding the transport is crucial to understanding and predicting constituent and density structures. Transport in waterbodies can be natural, such as seiche-induced boundary mixing or advectively-driven inflows. Hypolimnetic oxygenation using bubble-plumes also leads to enhanced mixing. Whether natural or plume-induced, increased mixing will alter the waterbody properties. Conversely, the density structure affects the behavior of plumes as well as inflowing and outflowing water. For example, stratification resultin

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13

Samasiri, Peeradon. "Mixing in axisymmetric gravity currents and volcanic conduits." Thesis, University of Cambridge, 2018. https://www.repository.cam.ac.uk/handle/1810/280120.

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The first part of this thesis investigates the mixing of ambient fluid into axisymmetric high Reynolds number gravity currents. A series of laboratory experiments were conducted in which small scale gravity currents travelled along a wedge shaped channel with an increasing width in the downstream direction. The channel was filled with fresh water and the current was generated using saline solution introduced either by a rapid release of a known finite volume from behind a lock gate or by pumping at a constant rate into the apex of the channel. The distribution and evolution of the density of t

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14

Churchill, Jillian Jean. "Optimal mixing regimes for alum treatment of creek inflow to Jameson Lake, Washington." Online access for everyone, 2008. http://www.dissertations.wsu.edu/Thesis/Summer2008/j_churchill_042908.pdf.

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15

Andradóttir, Hrund ÓlÅ f. 1972. "Circulation and mixing in the upper forebay of the Mystic Lake system, Winchester, Masshachusetts." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10361.

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16

Brunkalla, Roberta Joann. "Influence of Mixing and Buoyancy on Competition Between Cyanobacteria Species in Upper Klamath Lake." PDXScholar, 2017. https://pdxscholar.library.pdx.edu/open_access_etds/3998.

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Abstract (sommario):

Cyanobacterial blooms in lakes impact human health, the economy, and ecosystem health. It is predicted that climate change will promote and increase the frequency and intensity of cyanobacterial blooms due to unique physiological adaptions that allow cyanobacteria to exploit warm stable water bodies. Key cyanobacteria physiological adaptions include nitrogen fixation, buoyancy regulation and higher optimum growth temperatures. The largest uncertainty of predicting the effect of climate change is in understanding how the interactions among species will change. Adding to the ambiguity, cyanobact

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17

Kristen, Iris. "Investigations on rainfall variability during the late Quaternary based on geochemical analyses of lake sediments from tropical and subtropical southern Africa." Phd thesis, Universität Potsdam, 2009. http://opus.kobv.de/ubp/volltexte/2009/3254/.

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This thesis presents investigations on sediments from two African lakes which have been recording changes in their surrounding environmental and climate conditions since more than 200,000 years. Focus of this work is the time of the last Glacial and the Holocene (the last ~100,000 years before present [in the following 100 kyr BP]). One important precondition for this kind of research is a good understanding of the present ecosystems in and around the lakes and of the sediment formation under modern climate conditions. Both studies therefore include investigations on the modern environment (in

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18

Krallis, George A. "Modeling the mean shear component of wind-induced mixing in lakes /." Diss., 2000. http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:9982866.

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19

Bluteau, Cynthia Evelyn. "Mixing in brackish lakes due to surface ice : a physical model." Thesis, 2006. http://hdl.handle.net/2429/17875.

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The effects of salt expelled by surface ice upon formation are investigated in the laboratory to determine whether it promotes merolnixis in lakes. The experiments consist of creating surface ice in an insulated container and letting it melt, while taking a time series of temperature measurements at different depths. The model lake has dimensions 0.34m x 0.18m x 0.3m depth and is sufficiently well insulated to allow the formation of an reverse temperature stratification in the water column. The experiments start with well-mixed saline solution at room temperature. Initial salinity ranges from

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20

(10730739), Maathangi Ganesh. "A NUMERICAL INVESTIGATION OF BUBBLE-INDUCED LIQUID AGITATION AND BUBBLE DYNAMICS IN STRATIFIED FLOWS." Thesis, 2021.

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<div>Mixing of stratified fluids due to motion of bubble swarms can happen through two major mechanisms. The first is the capture and transport of heavier liquid into the lighter layers by the bubble wake. The second is the mixing due to turbulent dispersion. Stratification also affects bubble dynamics in various ways, namely by reducing the horizontal and vertical bubble fluctuations and extent, altering the drag experienced by rising bubbles, and changing the wake dynamics. The objective of this study is to understand these explained phenomena by decoupling their effects from each other and

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21

Hayden, Natanya Jeanne. "Deep Water Mixing Prevents Harmful Algal Bloom Formation: Implications for Managed Fisheries Refugia." Thesis, 2011. http://hdl.handle.net/1969.1/ETD-TAMU-2011-08-9883.

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Inflows affect water quality, food web dynamics, and even the incidence of harmful algal blooms. It may be that inflows can be manipulated to create refuge habitat for biota trying to escape poor environmental conditions, such as fish populations in lakes during times of toxic Prymnesium parvum blooms. Water availability sometimes can be an issue, especially in arid climates, which limits this approach to management. Utilizing source water from deeper depths to displace surface waters, however, might effectively mimic inflow events. I test this notion by conducting in-lake mesocosm experime

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22

Falcone, Matthew. "Assessing hydrological processes controlling the water balance of lakes in the Peace-Athabasca Delta, Alberta, Canada using water isotope tracers." Thesis, 2007. http://hdl.handle.net/10012/3081.

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One of the world’s largest freshwater deltas (~4000 km2), the Peace-Athabasca Delta (PAD), is located at the convergence of the Peace and Athabasca rivers and Lake Athabasca in northern Alberta, Canada. Since the early 1970s, there has been increasing concern regarding the ecological impacts on the PAD after flow regulation of the Peace River began in 1968, decreased discharge in the Peace and Athabasca rivers as a result of hydroclimatic changes in Western Canada, and increased Athabasca River water usage by oil sands development to the south. This thesis is part of an ongoing, multi-discip

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23

(8066834), David J. Cannon. "Hypolimnetic Mixing in Lake Michigan." Thesis, 2019.

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<p>Little work has been done to estimate turbulence characteristics in the hypolimnetic waters of large lakes, where the magnitude and vertical structure of turbulent parameters have important implications for nutrient cycling and benthic exchange. In this thesis, hypolimnetic mixing is investigated over the annual stratification cycle in a large lake using a series of experiments in Lake Michigan that utilize acoustic Doppler velocimeters, thermistors, and microstructure profilers to characterize mean flow and turbulence throughout the water column. More than 500 days of physical limnologica

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24

Yadav, Badri Vishal. "Circulation and mixing in Lake Champlain." 2008. http://proquest.umi.com/pqdweb?did=1453214831&sid=10&Fmt=2&clientId=39334&RQT=309&VName=PQD.

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Abstract (sommario):

Thesis (M.S.)--State University of New York at Buffalo, 2008.<br>Title from PDF title page (viewed on Sept. 02, 2008) Available through UMI ProQuest Digital Dissertations. Thesis adviser: Atkinson, Joseph F. Includes bibliographical references.

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25

James, Christina. "Mixing processes from CTD profiles using a lake-specific equation of state : Quesnel Lake." Thesis, 2004. http://hdl.handle.net/2429/16247.

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Quesnel Lake, is a deep (511m maximum depth) fjord-type lake in northeast British Columbia, Canada. Mixing processes in the lake exchange deep-water with surface water and contribute to the renewal of surface-water nutrients and oxygenated deep-water. These processes are of great consequence to the lake's trophic dynamics and understanding them will enable better management of the large salmon resources in Quesnel Lake. To better understand large-scale convective processes, a lake-specific equation of state was developed. Water samples were collected at locations around Quesnel Lake an

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26

Menacherry, Saju. "’Source to sink’ sedimentology and petrology of a dryland fluvial system, and implications for reservoir quality, Lake Eyre Basin, Central Australia." 2008. http://hdl.handle.net/2440/56268.

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Reservoir quality of subsurface sandstones depends on the composition, texture and grain size of the initial sediments. These factors are a function of hinterland processes: tectonic setting, provenance, climate and depositional environment, and sediment transportation processes. This study focuses on a modern, dryland, fluvial deposition system from source-to-sink that aims to provide a quantitative dataset analogue to facilitate forward modelling for prediction of subsurface compositions, grain size and textures of reservoir sandstones. Umbum Creek, in the western Lake Eyre Basin of Central

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