Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 22 for “"Advective transport"”.
-
Prediction, analysis, and learning of advective transport in dynamic fluid flows
Transport of any material quantity due to background fields, i.e. advective transport, in fluid dynamical systems has been a widely studied problem. It is of crucial importance in classical fluid mechanics, geophysical flows, micro and nanofluidics, and biological flows. Even though mathematical …
-
Environmental drivers and advective transport of harmful phytoplankton in North West European shelf seas
… Determine the role of advection in bloom transport and development;<br/>3) Utilise computational modelling to study environmental drivers and advection of<br/>HABs.<br/>To achieve these aims, field data was collected from two cruises and a glider mission. During the cruises, data on …
-
Observation of New Particle Formation in the Northern Hemisphere at Altitude from 4 to 20 km
… of NPF events and the air mass convective and/or advective transport. CO and O3 act as tracers of tropospheric and stratospheric air, respectively, their statistical relationship can be used to quantify air mass characteristics and origins. The mixing ratio values of CO increased within the upper …
-
Cooling and internal waves on the Continental Shelf
… vertical mixing is eventually suppressed by the advective transport of cold, dense water offshore. Once this happens, alongshore geostrophic flows form, and become baroclinically unstable. The surface heat flux is then balanced by a cross-shelf eddy heat flux. Scales are found for the cross-shelf …
-
The simulation of surface ship micro-bubble wakes
A method in which the transport and evolution of the bubble population in a surface ship wake is numerically simulated is presented. The simulation is accomplished by constructing an advective-diffusive transport model for the scalar bubble field and solving this model for late times after ship …
-
Processes and community structure in microbial biofilms of the River Elbe: relation to nutrient dynamics and particulate organic matter
… zone. The second aspect was the investigation of advective transport of algal cells through porous media. In laboratory columns the retention and retardation of morphological different algae was estimated. In the year 2001, it was possible to use the diving bell of the Office of Water and …
-
Hydrogeologic Model of a Leachate Plume in an Unconfined Coastal Plain Aquifer and Chemical Transport Mechanisms of Metals and Dense Non-Aqueous Phase Liquids
… the regional groundwater flow and contaminant transport at the site. This model was then used to investigate the migration of chlorinated hydrocarbons (CHCs) and metals in unconfmed high porosity sandstone, indicating that migration for both CHCs and metals were caused by advective transport. …
-
HYDROGEOLOGICAL CHARACTERIZATION OF A LEGACY WASTE STORAGE SITE AND THE CHALLENGE OF COMMUNICATING UNCERTAINTY
Analytical groundwater and contaminant transport models rely on estimates of hydrogeological parameters that can range from two to three orders of magnitude. The effect parameter variability has on the results of groundwater and contaminant transport modelling was assessed for a legacy nuclear …
-
Identifying dynamical boundaries and phase space transport using Lagrangian coherent structures
… occurs. These codimension-one sets thus act as transport barriers. This geometric framework of transport barriers is used to study various problems in phase space transport, specifically problems of separation in flows that can vary in scale from the micro to the geophysical. The first problem …
-
Is the Indian Ocean MOC driven by internal wave breaking?
… by assuming a 'mixing efficiency' of 0.2 and an advective-diffusive balance in neutral density layers. The advective transport of mass into this box-model is based on<br/>published estimates of the flow field at 32ºS and the Indonesian Through-flow. A comparison of the large scale dissipation …
-
Processes Affecting the Behavior of Redox-Sensitive Elements in Chesapeake Bay
… reactions in the water column, (2) advective transport, and (3) diffusion from underlying sediments.</p> <p>The purpose of the study was to establish whether estuarine redox reactions are controlled by a complex interaction of processes 1 to 3. Short-term and long-term studies were …
-
Nitrogen spiraling in stream ecosystems spanning a gradient of chronic nitrogen loading
… (the paired processes of nutrient cycling and advective transport) in stream ecosystems. Anthropogenic activities have greatly increased rates of N loading to aquatic ecosystems. However, streams may be important sites for retention, removal, and transformation of N. In order to identify …
-
Hydrothermal Transport in the Panama Basin and in Brothers Volcano using Heat Flow, Scientific Deep Sea Drilling and Mathematical Models
… Volcano and use mathematical models to estimate advective heat and mass fluxes, and crustal permeability. In the first manuscript, I use a well-mixed aquifer model to explain the heat transport in a sediment pond in the inactive part of the Ecuador Fracture Zone. This model yields mass fluxes and …
-
Estuarine sediment nutrient exchange: the importance of physical transport mechanisms and benthic micro-communities
… of benthic micro-communities and physical transport mechanisms on sediment nutrient flux were investigated for two nearshore sediment types on Virginia’s Eastern Shore. Subtidal sandy mineral sediments were conducive to water transport and subsequently influenced by groundwater discharge to …
-
Chaotic advection, mixing, and property exchange in three-dimensional ocean eddies and gyres
… coherent structures will be barriers to transport for long times if they are much larger than the Batchelor scale. The second case is a model of the Western Alboran Gyre with realistic forcing and bathymetry. I examine its transport properties from both an Eulerian and Lagrangian …
-
Chaotic advection, mixing, and property exchange in three-dimensional ocean eddies and gyres
… coherent structures will be barriers to transport for long times if they are much larger than the Batchelor scale. The second case is a model of the Western Alboran Gyre with realistic forcing and bathymetry. I examine its transport properties from both an Eulerian and Lagrangian …
-
Design and Validation of Medical Devices for Photothermally Augmented Treatments
*1-Dimensional Advective-Diffusion Model in Porous Media Infusion of therapeutic agents into tissue is makes use of two mass transport modes: advective transport, and molecular diffusion. Bulk infusion into a 0.6% wt agarose phantom was modeled as an infinite, homogenous, and isotropic porous …
-
The marine geochemistry of methane
… of the model fits to the data suggests that both advective supply of methane-rich coastal waters and in situ biological methane production are important sources for the mixed layer methane excess. The complexity of the hydrographic regime near Walvis Bay makes it impossible to make a quantitative …
-
Investigation of horizontal meteorological structures in comparison to turbulent structures at a forest edge
… at the clearing and within the forest) and the advective transport of energy towards the forest edge. The reverse was also apparent, where energy was transported off the forest edge towards the clearing. Nevertheless, highest energy and CO2 fluxes, as well as highest variation could be observed …
-
Solute Transport Modelling of Latrobe Valley Ash Disposal Sites
… in evaluating the mechanisms which lead to the transport of solutes from ash disposal and develops a methodology to quantify their potential long term impacts on groundwaters beneath a disposal site. The Loy Yang power station is used as a case study. A detailed literature review is presented on …
Page 1 of 2