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dc.contributor.advisor Palmer, Robert
dc.contributor.advisor Chilson, Phillip
dc.contributor.author Scipión, Danny
dc.date.accessioned 2019-04-15T16:19:34Z
dc.date.available 2019-04-15T16:19:34Z
dc.date.issued 2011
dc.identifier.uri http://repositorio.igp.gob.pe/handle/IGP/4466
dc.description.abstract The boundary layer (BL) is the lowest part of the atmosphere where the flow field is directly influenced by interactions among air, heat, and the Earths surface. The structure of flow in the BL is dynamic due to the fact that the atmospheric flow is turbulent. Turbulence in the daytime convective boundary layer (CBL) is primarily caused by buoyancy forced from the heated underlying surface. Wind profilers are one of the many instruments used to study and characterize the atmosphere. In addition to in-situ observations, numerical large-eddy simulations (LES) have been probed to adequately reproduce the CBL under different conditions. The focus of this work is to bring the advantages of LES techniques to assist in the interpretation of data from wind profilers. The present study focuses on an example of flow structure of the CBL as observed in the U.S. Southern Great Plains Atmospheric Radiation Measurement Climate Research Facility in Lamont, Oklahoma on June 8, 2007. The considered CBL flow has been reproduced using LES, sampled with a LES-based virtual boundary layer radar (BLR), and probed with an actual operational wind profiler. The LES-generated CBL flow data are then ingested by the virtual BLR and treated as a proxy for prevailing atmospheric conditions. The virtual BLR has been used to simulate radar signals obtained from wind profilers through the synthesis of Doppler beam swinging (DBS) and spaced antenna (SA) techniques and to retrieve the three-dimensional wind fields. Comparisons of the estimates of the structure parameter of refractive index [special characters omitted], wind fields, vertical velocity variance, and vertical velocity skewness have been presented for the LES, virtual BLR, and actual radar. It has been observed that during the presence of strong horizontal shear of vertical velocity, the estimates of the horizontal wind fields are biased. This study will quantify the effect of this shear for both wind estimation techniques under different conditions. Additionally, it has been noticed that this shear also biases the estimates of turbulence kinetic energy (TKE) calculated from the variances of the wind fields. Finally, the TKE (eddy) dissipation rate ε can be obtained from radar estimates of Doppler spectral width. Values of ε are obtained from the different oblique and vertical beams and contrasted with the LES estimates obtained through a parameterized expression that relates the dissipation rate to sub-grid TKE and turbulence length scale. en_US
dc.description.uri Tesis es_ES
dc.format application/pdf es_ES
dc.language.iso eng es_ES
dc.publisher The University of Oklahoma es_ES
dc.rights info:eu-repo/semantics/restrictedAccess es_ES
dc.source Repositorio institucional - IGP es_ES
dc.subject Radar Doppler es_ES
dc.subject Radar de dispersión incoherente es_ES
dc.subject Medición de temperatura es_ES
dc.subject Flujo atmosférico es_ES
dc.subject Simulador de radar es_ES
dc.subject Perfilador de viento es_ES
dc.subject Energía cinética de turbulencia es_ES
dc.title Characterization of the convective boundary layer through a combination of large-eddy simulations and a radar simulator en_US
dc.type info:eu-repo/semantics/doctoralThesis es_ES
dc.subject.ocde Radar es_ES
dc.subject.ocde Atmósfera es_ES
dc.subject.ocde Investigación científica es_ES
thesis.degree.grantor The University of Oklahoma. es_ES
thesis.degree.level Doctorado es_ES
thesis.degree.discipline Ingeniería eléctrica y computación es_ES
dc.description.peer-review es_ES

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