Dissertations / Theses on the topic 'Canopy'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 dissertations / theses for your research on the topic 'Canopy.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.
Medina, Alejandro Josue. "Urban Canopy." Thesis, Virginia Tech, 2009. http://hdl.handle.net/10919/44892.
Full textMaster of Architecture
Carlyle, Erin. "Magnolia Canopy Otherworld." Bowling Green State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1555331993434814.
Full textNewell, Felicity L. "A Bird’s Eye View of the Forest: How Does Canopy Openness Affect Canopy Songbirds?" The Ohio State University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=osu1276875484.
Full textNoble, Sidney Lake. "The Influence of Canopy Cover and Canopy Heterogeneity on Plant Diversity within Oak Savannas." Miami University / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=miami1595843486558554.
Full textUdumala, Savary Sajith Kumar Jose. "Study of the force distribution in the citrus canopy during harvest using continuous canopy shaker." [Gainesville, Fla.] : University of Florida, 2009. http://purl.fcla.edu/fcla/etd/UFE0041324.
Full textGrant, Eleanor Rose. "Canopy-atmosphere interactions over complex terrain." Thesis, University of Leeds, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.550799.
Full textHolland, M. R. "Canopy collapse of dried pea crops." Thesis, University of Edinburgh, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.305741.
Full textJackson, Robin Geoffrey. "Remote sensing of forest canopy gaps." Thesis, University of Southampton, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327361.
Full textCuello, Nerea. "NEW CONCEPT OF A STROLLER CANOPY." Thesis, Tekniska Högskolan, Jönköping University, JTH, Industridesign, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-49442.
Full textMonteleone, Susan Elaine. "Light Spectra Distributions in Temperate Conifer-Forest Canopy Gaps, Oregon and in Tropical Cloud-Forest Canopy, Venezuela." Thesis, University of North Texas, 1997. https://digital.library.unt.edu/ark:/67531/metadc279052/.
Full textBalduzzi, Mathilde. "Plant canopy modeling from Terrestrial LiDAR System distance and intensity data." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20203.
Full textThe challenge of this thesis is reconstruct the 3D geometry of vegetation from distance and intensity data provided by a 3D scanner LiDAR. A method of “Shape-From-Shading” by propagation is developed to be combined with a fusion method of type “Kalman” to get an optimal reconstruction of the leaves. -Introduction-The LiDAR data analysis shows that the point cloud quality is variable. This quality depends upon the measurement set up. When the LiDAR laser beam reaches the edge of a surface (or a steeply inclined surface), it also integrate background measurement. Those set up produce outliers. This kind of set up is common for foliage measurement as foliages have in general fragmented and complex shape. LiDAR data are of bad quality and the quantity of leaves in a scan makes the correction of outliers fastidious. This thesis goal is to develop a methodology to allow us to integrate the LiDAR intensity data to the distance to make an automatic correction of those outliers. -Shape-from-shading-The Shape-from-shading principle is to reconstruct the distance values from intensities of a photographed object. The camera (LiDAR sensor) and the light source (LiDAR laser) have the same direction and are placed at infinity relatively to the surface. This makes the distance effect on intensity negligible and the hypothesis of an orthographic camera valid. In addition, the relationship between the incident angle light beam and intensity is known. Thanks to the LiDAR data analysis, we are able to choose the best data between distance and intensity in the scope of leaves reconstruction. An algorithm of propagation SFS along iso-intense regions is developed. This type of algorithm allows us to integrate a fusion method of type Kalman. -Mathematical design of the method-The patches of the surface corresponding to the iso-intense regions are patches of surfaces called the constant slope surfaces, or sand-pile surfaces. We are going to use those surfaces to rebuild the 3D geometry corresponding to the scanned surfaces. We show that from the knowledge of the 3d of an iso-intensity region, we can construct those sand-pile surfaces. The initialization of the first iso-intense regions contour (propagation seeds) is done with the 3D LiDAR data. The greatest slope lines of those surfaces are generated. Thanks to the propagation of those lines (and thus of the corresponding sand-pile surface), we build the other contour of the iso-intense region. Then, we propagate the reconstruction iteratively. -Kalman filter-We can consider this propagation as being the computation of a trajectory on the reconstructed surface. In our study framework, the distance data is always available (3D scanner data). It is thus possible to choose which data (intensity vs distance) is the best to reconstruct the object surface. This can be done with a fusion of type Kalman filter. -Algorithm-To proceed a reconstruction by propagation, it is necessary to order the iso-intensity regions. Once the propagation seeds are found, they are initialized with the distances provided by the LiDAR. For each nodes of the hierarchy (corresponding to an iso-intensity region), the sand-pile surface reconstruction is done. -Manuscript-The thesis manuscript gathers five chapters. First, we give a short description of the LiDAR technology and an overview of the traditional 3D surface reconstruction from point cloud. Then we make a state-of-art of the shape-from –shading methods. LiDAR intensity is studied in a third chapter to define the strategy of distance effect correction and to set up the incidence angle vs intensity relationship. A fourth chapter gives the principal results of this thesis. It gathers the theoretical approach of the SFS algorithm developed in this thesis. We will provide its description and results when applied to synthetic images. Finally, a last chapter introduces results of leaves reconstruction
Perkins, Kelly A. "Cerulean warbler selection of forest canopy gaps." Morgantown, W. Va. : [West Virginia University Libraries], 2006. https://eidr.wvu.edu/etd/documentdata.eTD?documentid=4596.
Full textGao, Jincheng. "Canopy chlorophyll estimation with hyperspectral remote sensing." Diss., Manhattan, Kan. : Kansas State University, 2006. http://hdl.handle.net/2097/252.
Full textPilger, Neal, and University of Lethbridge Faculty of Arts and Science. "Canopy reflectance modeling of forest stand volume." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Arts and Science, 2004, 2004. http://hdl.handle.net/10133/230.
Full textxiii, 143 leaves : ill. (some col.) ; 29 cm.
Narayanan, Sruthi. "Canopy architecture and water productivity in sorghum." Thesis, Kansas State University, 2011. http://hdl.handle.net/2097/8760.
Full textDepartment of Agronomy
Robert M. Aiken
Increasing crop water use efficiency (WUE), the amount of biomass produced per unit water consumed, can enhance crop productivity and yield potential. The objective of the first study was to evaluate the factors affecting water productivity among eight sorghum (Sorghum bicolor (L.) Moench) genotypes, which differ in canopy architecture. Sorghum genotypes, grown under field conditions, showed significant differences in (a) biomass production, (b) water use, (c) intercepted radiation, (d) water productivity and (e) radiation use efficiency (RUE; the amount of biomass produced per unit of intercepted radiation which is suitable for photosynthesis). WUE and RUE were more strongly correlated to biomass production than to water use or intercepted radiation, respectively. RUE was positively correlated to WUE and tended to increase with internode length, the parameter used to characterize canopy architecture. These results demonstrate that increased utilization of radiation can increase water productivity in plants. Sorghum canopies that increase light transmission to mid−canopy leaves can increase RUE and also have the potential to increase crop productivity and WUE. The objective of the second study was to develop a quantitative model to predict leaf area index (LAI), a common quantification of canopy architecture, for sorghum from emergence to flag leaf stage. LAI was calculated from an algorithm developed to consider area of mature leaves (leaves with a ligule/collar), area of expanding leaves (leaves without a ligule/collar), total leaf area per plant and plant population. Slope of regression of modeled LAI on observed LAI varied for photoperiod sensitive (PPS) and insensitive (non−PPS) genotypes in 2010. A good correlation was found between the modeled and observed LAI with coefficient of determination (R[superscript]2) 0.96 in 2009 and 0.94 (non−PPS) and 0.88 (PPS) in 2010. These studies suggest that canopy architecture has prominent influence on water productivity of crops and quantification of canopy architecture through an LAI simulation model has potential in understanding RUE, WUE and crop productivity.
Carr, Daniel. "Non-intrusive load monitoring with canopy clustering." Thesis, University of South Wales, 2012. https://pure.southwales.ac.uk/en/studentthesis/nonintrusive-load-monitoring-with-canopy-clustering(14629d2f-4fdf-47c0-aa3e-9cb7924ce5df).html.
Full textJenkins, Stuart Rees. "The ecology of sheltered, canopy dominated shores." Thesis, University of Liverpool, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.481202.
Full textEdwards, Clinton Lee. "Free-space optical communications through a forest canopy." College Park, Md. : University of Maryland, 2004. http://hdl.handle.net/1903/1742.
Full textThesis research directed by: Dept. of Electrical and Computer Engineering. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Bamatraf, Abdurhman Mohamed. "Temporal and spatial relationships of canopy spectral measurements." Diss., The University of Arizona, 1986. http://etd.library.arizona.edu/etd/GetFileServlet?file=file:///data1/pdf/etd/azu_e9791_1986_25_sip1_w.pdf&type=application/pdf.
Full textPera, Gizelle M. "Canopy Demographics at the Firestone Reserve, Costa Rica." Scholarship @ Claremont, 2010. http://scholarship.claremont.edu/cmc_theses/707.
Full textWells, Rachel. "Genetic control of canopy architecture in Brassica napus." Thesis, University of East Anglia, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.439928.
Full textRowland, Clare Sharon. "Forward and inverse modelling of forest canopy reflectance." Thesis, University of Salford, 2001. http://usir.salford.ac.uk/46521/.
Full textFort, Tania. "Functions, transmission and emission of the canopy microbiota." Thesis, Bordeaux, 2019. http://www.theses.fr/2019BORD0338.
Full textTrees interact with diverse microbial communities that influence their fitness and the functioning of terrestrial ecosystems. Unlike microorganisms associated with roots and soil, microorganisms that colonize the forest canopy are still poorly understood. The objective of this thesis is to better understand the functions of microorganisms associated with the aerial parts of trees (leaves, stems, seeds) as well as their vertical (from the plant to its offspring) and horizontal (emission from the plant to the atmosphere) transmission dynamics, by combining molecular ecology and plant ecophysiology analyses. The first chapter [P1] shows a vertical stratification of fungal and foliar bacterial communities within the beech canopy (Fagus sylvatica). This stratification is more pronounced for epiphytic microorganisms than for endophytes. It also decreases during the growing season in bacteria and appears to be related to morphology rather than foliar physiology. Vertical stratification of microbial functions is being analyzed. The second chapter [P2] highlights the presence of fungi in the internal tissues of the acorns of sessile oak (Quercus petraea), including the embryo, suggesting that the microbiota can be transmitted vertically from the mother tree to its offsprings and influence forest regeneration. Acorns contain in particular several fungal pathogens, in association with their mycoparasites. These fungal communities vary significantly depending on the mother tree and the oak population. Finally, the third chapter [P3] tests a prototype for measuring bacterial emission fluxes over plant cover. It shows that half of the species captured in the atmosphere are present on the leaf surface and suggests that the composition of bioaerosols is strongly influenced by the locally dominant cultivated plant, the grapevine (Vitis vinifera). Complementary measures, including a wider range of forest and non-forestry habitats, will have to be carried out to better understand the origin of emissions, which are known to influence the water cycle. This thesis therefore provides elements for modelling the dynamics and evolution of the tree-microbiota-atmosphere system, which will need to be strengthened and integrated into knowledge of the soil system in order to respond to the challenges raised by climate change
Carr, Daniel. "Canopy Disturbance and Reproduction in Cornus florida L." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/2245.
Full textMonje, Oscar A. "Effects of Elevated CO2 on Crop Growth Rates, Radiation Absorption, Canopy Quantum Yield, Canopy Carbon Use Efficiency, and Root Respiration of Wheat." DigitalCommons@USU, 1993. https://digitalcommons.usu.edu/etd/6763.
Full textPeterson, Birgit Ellen. "Canopy fuels inventory and mapping using large-footprint lidar." College Park, Md. : University of Maryland, 2005. http://hdl.handle.net/1903/3189.
Full textThesis research directed by: Geography. Title from t.p. of PDF. Includes bibliographical references. Published by UMI Dissertation Services, Ann Arbor, Mich. Also available in paper.
Burlison, Alison Jean. "Sward canopy structure and ingestive behaviour in grazing animals." Thesis, University of Edinburgh, 1987. http://hdl.handle.net/1842/27546.
Full textEspinoza, Fermin Owens Robb E. "Identifying roads and trails hidden under canopy using Lidar." Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Sep%5FEspinoza.pdf.
Full textThesis Advisor(s): Olsen, R. C. "September 2007." Description based on title screen as viewed on October 22, 2007. Includes bibliographical references (p.105-108). Also available in print.
Larrivée, Maxim. "Diversity of canopy spiders in north-temperate hardwood forests." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115856.
Full textOwens, Robb E. "Identifying roads and trails hidden under canopy using Lidar." Thesis, Monterey, California. Naval Postgraduate School, 2007. http://hdl.handle.net/10945/3329.
Full textKrougios, Prokopios. "Extracting hidden trails and roads under canopy using LIDAR." Thesis, Monterey, California. Naval Postgraduate School, 2008. http://hdl.handle.net/10945/3823.
Full textLuker-Brown, M. "Simulating the interactions between canopy microclimate and vegetation physiology." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.299539.
Full textPAULA, REGINALDO ROSA COTTO DE. "NUMERICAL INVESTIGATION OF FLOW WITHIN AND ABOVE FOREST CANOPY." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2007. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=11570@1.
Full textNeste trabalho três métodos foram utilizados para estudar o escoamento turbulento em regiões de florestas. No primeiro método, a influência da vegetação no escoamento foi modelada através da adição de termos fontes nas equações de quantidade de movimento, energia cinética turbulenta e sua taxa de dissipação. No segundo, a vegetação foi considerada um meio poroso homogêneo. Finalmente, a camada do dossel foi representada por modelos 3-D de árvores, consideradas como obstáculos individuais. As equações foram resolvidas através do modelo de turbulência k −E padrão com o programa comercial FLUENT 6.2.16. As previsões dos perfis verticais da velocidade do vento médio, da intensidade da turbulência e dos tensores de Reynolds, foram comparadas com dados de experimentos de túnel de vento. Os resultados preditos dos perfis verticais da velocidade média e intensidade da turbulência, na primeira e na segunda metodologias, apresentaram boa concordância com os valores experimentais, porém, foram observadas discrepâncias nos perfis modelados do tensor de Reynolds. Entretanto, qualitativamente, a modelagem consegue capturar o comportamento físico do tensor de Reynolds no interior de florestas. Uma possível explicação para este fato, é que o modelo considera a isotropia para a viscosidade turbulenta, implicando na incapacidade de prever qualquer forte anisotropia do campo turbulento. Na terceira metodologia, as previsões dos perfis verticais de velocidade média e intensidade da turbulência apresentaram discrepâncias em relação às medições. Porém, os perfis verticais do tensor de Reynolds apresentaram boa concordância. Todos os perfis verticais da velocidade média apresentaram um ponto de inflexão na interface vegetação-atmosfera, característico de uma camada de mistura. Nas duas primeiras metodologias, este padrão foi confirmado nos perfis de tangente hiperbólica de uma camada de mistura.
This work investigates different procedures in order to study the turbulent flow over the scale model of a forest region. Initially, the canopy flow was modeled by using source terms in the momentum, turbulent kinetic energy and its dissipation rate equations. After that, the forest canopy was considered a homogeneous porous medium. In the last step, the canopy boundary layer was modeled by artificial 3-D tree models. This was done by using the standard k−E turbulence model with the FLUENT commercial program. The modeled profiles of mean velocity, turbulence intensity and Reynolds stress were compared against data from wind tunnel experiments. In the two first methodologies, the model predictions of the vertical profiles of the wind speed and turbulence intensity showed good agreement with the experimental data. It was found that predictions of the Reynolds tensor were sensitive to the parameterization scheme of the standard k −E model. However, qualitatively, the model was capable of predicting the physical behavior of the Reynolds stress tensor in the canopy flow. A possible explanation for this behavior is the omission of any anisotropic eddy-viscosity effects within the k - E modelling approach. When it was considered the tree array, the model predictions for the wind speed and turbulence intensity were less satisfactory. However, it was found that the predicted results of the Reynolds stress tensor agreed well with the measured data. All the vertical profiles of the mean velocity contained an inflection point, something which is a necessary criterion for the mixing layer flow. In the tree array, the modeled results failed to the capture this behavior of the canopy flow. In the 2-D numerical simulations, it was found the characteristic hyperbolic tangent profile of a mixing layer.
Roberts, Anthony. "The influence of acacias on below canopy grass communities." Bachelor's thesis, University of Cape Town, 2000. http://hdl.handle.net/11427/26501.
Full textKimball, Pulelehua L. "Urban Tree Canopy Assessments in the Chesapeake Bay Watershed." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/48057.
Full textMaster of Science
Horn, Andrea L. "Assessment of Tree Canopy Effects Overtop Low Volume Roadways." Ohio University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1564052715480026.
Full textTeixeira, João Carlos Martins. "WRF sensitivity to lower boundary and urban canopy parametrizations." Master's thesis, Universidade de Aveiro, 2012. http://hdl.handle.net/10773/10175.
Full textAo longo dos anos avanços, na tecnologia de satélite viabilizaram a aquisição de informações sobre a superfície da Terra, tais como elevação e uso do solo, com grande detalhe e resolução. Esta informação pode ser incluída em modelos numérico da atmosfera, atualizando e dando-lhes mais detalhes sobre as condições de fronteira inferior. Assim sendo, este trabalho visa estudar a sensibilidade do Weather Research and Forecasting model a três conjuntos de dados de topografia, e dois de uso do solo diferentes. Um caso de estudo em que a precipitação orográfica foi dominante sobre a Ilha da Madeira foi considerado mostrando que, em geral não existe um aumento significativo da performance do modelo ao usar topografia ou uso do solo de alta resolução. Contudo, existe uma melhor performance do modelo em simular a precipitação a barlavento e o fluxo a sotavento da ilha. Dada a natureza deste estudo, considerou-se também um teste à sensibilidade de três parametrizações de microfísica, sendo que os resultados encontrados não mostram alterações significativas aos resultados encontrados. Além disso, a introdução de um novo conjunto de dados de uso do solo tornou possível realizar simulações usando modelos urbanos acoplados. Assim, de forma a estudar a sensibilidade a estes modelos considerou-se um caso de estudo sobre a região de Lisboa. Ao utilizar um modelo urbano verificou-se que sobre a região urbana existe um arrefecimento à superfície quando comparando com as simulações de controlo. Além disso verificou-se uma grande diferença no escoamento e na energia turbulenta produzida sobre esta zona. Estas diferenças podem por sua vez intaragem com ondas gravíticas, alterando a sua fase e amplitude. Além disso, ao comparar os resultados com dados observados verificou-se que, em geral, não existe melhoria na performance do modelo para este caso de estudo. No entanto o uso do modelo urbano BEP melhora significativamente os resultados relativos à altura da camada de mistura.
Through the years, the advances in satellite technology made feasible the acquisition of information about the Earth surface, such as elevation and land use, with great detail and resolution. This information can be included in numerical atmospheric models, updating and giving them more details about the lower boundary. Given so, this work aims to study the sensitivity of the Weather Research and Forecast model to three different topography datasets as well as two different land use datasets. A test case study in which topography driven precipitation was dominant over Madeira Island was considered. Overall, results show that there is no enhancement of model skill when using higher resolution topography or land use. However, there is a higher model skill simulating precipitation on Madeira leeward and wind flow windward. Additionally, given the nature of this event, a sensitivity test was also performed considering three different microphysics parametrizations. This test showed that the choice of the microphysics parametrizations does not significantly change the results found for this event. Furthermore, the introduction of a new land use dataset turned possible to perform simulations using Urban Canopy Models. Therefore, the sensitivity of the model to these urban parametrizations was also performed. In this work, a case study for the Lisbon region was chosen and showed that the simulations that used a urban canopy model presented a cooling in the urban region. Moreover, larger changes were observed for wind flow and turbulence kinetic energy over the area. In addition, it was shown that these could change the phase and amplitude of gravity waves that were generated in the region. When comparing to observed data it was seen that there is no enhancement of model skill when using these models. However, the planetary boundary layer is better represent by BEP urban model.
Karatolios, Apostolos Krougios Prokopios. "Extracting hidden trails and roads under canopy using LIDAR." Monterey, Calif. : Naval Postgraduate School, 2008. http://edocs.nps.edu/npspubs/scholarly/theses/2008/Dec/08Dec%5FKaratolios.pdf.
Full textThesis Advisor(s): Olsen, R. C. ; Jenn, David C. "December 2008." Description based on title screen as viewed on January 29, 2009. Includes bibliographical references (p. 91-95). Also available in print.
Pauthenet, Martin. "Macroscopic model and numerical simulation of elastic canopy flows." Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0072/document.
Full textWe study the turbulent flow of a fluid over a canopy, that we model as a deformable porous medium. This porous medium is more precisely a carpet of fibres that bend under the hydrodynamic load, hence initiating a fluid-structure coupling at the scale of a fibre's height (honami). The objective of the thesis is to develop a macroscopic model of this fluid-structure interaction in order to perform numerical simulations of this process. The volume averaging method is implemented to describe the large scales of the flow and their interaction with the deformable porous medium. An hybrid approach is followed due to the non-local nature of the solid phase; While the large scales of the flow are described within an Eulerian frame by applying the method of volume averaging, a Lagrangian approach is proposed to describe the ensemble of fibres. The interface between the free-flow and the porous medium is handle with a One-Domain- Approach, which we justify with the theoretical development of a mass- and momentum- balance at the fluid/porous interface. This hybrid model is then implemented in a parallel code written in C$++$, based on a fluid- solver available from the \openfoam CFD toolbox. Some preliminary results show the ability of this approach to simulate a honami within a reasonable computational cost. Prior to implementing a macroscopic model, insight into the small-scale is required. Two specific aspects of the small-scale are therefore studied in details; The first development deals with the inertial deviation from Darcy's law. A geometrical parameter is proposed to describe the effect of inertia on Darcy's law, depending on the shape of the microstructure of the porous medium. This topological parameter is shown to efficiently characterize inertia effects on a diversity of tested microstructures. An asymptotic filtration law is then derived from the closure problem arising from the volume averaging method, proposing a new framework to understand the relationship between the effect of inertia on the macroscopic fluid-solid force and the topology of the microstructure of the porous medium. A second research axis is then investigated. As we deal with a deformable porous medium, we study the effect of the pore-scale fluid-structure interaction on the filtration law as the flow within the pores is unsteady, inducing time-dependent fluidstresses on the solid- phase. For that purpose, we implement pore-scale numerical simulations of unsteady flows within deformable pores, focusing for this preliminary study on a model porous medium. Owing to the large displacements of the solid phase, an immersed boundary approach is implemented. Two different numerical methods are compared to apply the no-slip condition at the fluid-solid interface: a diffuse interface approach and a sharp interface approach. The objective is to find the proper method to afford acceptable computational time and a good reliability of the results. The comparison allows a cross-validation of the numerical results, as the two methods compare well for our cases. This numerical campaign shows that the pore-scale deformation has a significant impact on the pressure drop at the macroscopic scale. Some fundamental issues are then discussed, such as the size of a representative computational domain or the form of macroscopic equations to describe the momentum transport within a soft deformable porous medium
Thomas, Daniel. "Hitchhiking in the Canopy: Ecological Patterns of Forest Mycobiomes." Thesis, University of Oregon, 2018. http://hdl.handle.net/1794/23141.
Full textWang, Wei-Min. "Estimation of component temperatures of vegetative canopy with Vis/NIR and TIR multiple-angular data through inversion of vegetative canopy radiative transfer model." Strasbourg, 2009. http://www.theses.fr/2009STRA6027.
Full textThe separation of component temperature is the basic step for the application of two-source algorithm. Multi-angular thermal infrared measurements provide a chance for the estimation of component temperatures (namely, soil and vegetation temperatures) with remotely-sensed data. The objective of this study is to explore the factors that affect the estimation of component temperatures and propose new algorithm for inverting the canopy radiative transfer models to compute component temperatures. The objectives of this dissertation include: (1) finding an appropriate candidate leaf angle distribution functions for modeling and inversion, (2) evaluating the scaling behavior of Beer's law and its effect on the estimation of component temperatures, (3) proposing an analytical model for directional brightness temperature at top of canopy, (4) retrieving component temperatures with neural network and simplex algorithms. The effects of leaf angle distribution function on extinction coefficient, which is a key parameter for simulating the radiative transfer through vegetative canopy, is explored to improve the radiative transfer modeling. These contributions will enhance our understanding of the basic problems existing in thermal IR remote sensing and improve the simulation of land surface energy balance. Further work can be conducted to continue the enhancement and application of proposed algorithm to remote sensing images
Wang, Wei-Min Li Zhao-Liang. "Estimation of component temperatures of vegetative canopy with Vis/NIR and TIR multiple-angular data through inversion of vegetative canopy radiative transfer model." Strasbourg : Université de Strasbourg, 2009. http://eprints-scd-ulp.u-strasbg.fr:8080/00001118.
Full textStrydom, Janéne. "Canopy manipulation practices for optimum colour of redglobe (V.Vinifera L.) /." Link to the online version, 2006. http://hdl.handle.net/10019/1228.
Full textVan, der Vyver Marius Lodewyk. "Restoring the biodiversity of canopy species within degraded spekboom thicket." Thesis, Nelson Mandela Metropolitan University, 2011. http://hdl.handle.net/10948/1564.
Full textKrayenhoff, Eric Scott. "A multi-layer urban canopy model for neighbourhoods with trees." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/51674.
Full textArts, Faculty of
Geography, Department of
Graduate
Gaige, Elizabeth. "Throughfall Dynamics and Canopy Processes in a Nitrogen Fertilized Forest." Fogler Library, University of Maine, 2005. http://www.library.umaine.edu/theses/pdf/GaigeES2005.pdf.
Full textHastwell, Graeme. "Facilitation and fertile islands : linking canopy effects with plant interactions /." Title page, contents and abstract only, 2001. http://web4.library.adelaide.edu.au/theses/09PH/09phh3588.pdf.
Full textCosta, Carlos. "Root and canopy characteristics of maize types with extreme architectures." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36898.
Full textPegoraro, Emiliano. "Environmental control of isoprene emission : from leaf to canopy scale." Thesis, University of Edinburgh, 2005. http://hdl.handle.net/1842/767.
Full textHarmon, Charles F. "Automating identification of roads and trails under canopy using LiDAR." Thesis, Monterey, California. Naval Postgraduate School, 2011. http://hdl.handle.net/10945/5585.
Full textAnalysis techniques are developed to automatically extract roads and trails under thick forest canopy. LiDAR data were taken over the Swanton Pacific Ranch in the Santa Cruz Mountains from an airborne laser mapping system, the Optech 3100, on March 9-10, 2010. Collected data were characterized by point densities of 5-10 m2. Point cloud data were reduced to digital surface models using ARCMAP (from ESRI). The DSM was calculated at 1 meter spacing. These surface models were analyzed using topographic tools in ENVI, allowing for calculation of curvature, slope, convexity, and shaded relief. A multi-layer dataset was built and analyzed using spectral analysis tools in ENVI. The classification technique used was a combination of maximum likelihood classifier and a decision tree after use of erosion/dilation operators. Results are compared to ground truth collected in 2011. Classification resulted in 83.6% true positive rate, and the image processing result reduced the false positive rate to 3.0%.