Sökning: "Atmospheric Boundary Layer"

Visar resultat 21 - 25 av 28 uppsatser innehållade orden Atmospheric Boundary Layer.

  1. 21. Crosswind assessment of trains on different ground configurations

    Master-uppsats, KTH/Järnvägsteknik

    Författare :Nachiyappan Venkatasalam; [2013]
    Nyckelord :Crosswind; ICE3; true flat ground TFG ; single track ballast and rail STBR ; atmospheric boundary layer ABL ; AeroTRAIN; CFD.;

    Sammanfattning : Cross wind analysis is one of the important safety measures for rail vehicle certification. The objective of this study is to identify which vehicle certification ground setup, true flat ground (TFG) or single track ballast and rail (STBR) represents a more realistic ground setup with atmospheric boundary layer (ABL) wind inlet and also to represent an embankment scenario. LÄS MER

  3. 22. Flux Attenuation due to Sensor Displacement over Sea

    Uppsats för yrkesexamina på grundnivå, Institutionen för geovetenskaper

    Författare :Erik Nilsson; [2007]
    Nyckelord :Meteorology; Attenuation; Sensible Heat Flux; Eddy Correlation; Marine Atmospheric Boundary Layer; Complex Error Function;

    Sammanfattning : In this study the flux attenuation due to sensor displacement has been investigated over sea using an extensive set of data from the "Ocean Horizontal Array Turbulence Study". All previous investigations of the flux attenuation have been performed over land. LÄS MER

  4. 23. Estimation of gusty winds in RCA

    Magister-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Maria Nordström; [2005]
    Nyckelord :wind gust estimation; RCA; model evaluation;

    Sammanfattning : In this study a new wind gust estimate (WGE) method proposed by Brasseur (2001) is implemented in a limited area climate model (RCA, Rossby Centre regional Atmospheric model). The WGE method assumes that wind gusts develop when air parcels higher up in the boundary layer deflect down to the surface by turbulent eddies. LÄS MER

  5. 24. An investigation of the surface fluxes and other parameters in the regional climate model RCA1 during ice conditions

    Magister-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Camilla Tisell; [2004]
    Nyckelord :RCA; ERA-40; surface fluxes; Baltic Sea;

    Sammanfattning : In this study data from the regional climate model RCA1 is compared to measured data to investigate how good the model is during ice conditions and mainly how well the turbulent surface fluxes are described by the model. Comparisons of the sensible heat flux and the momentum flux as well as mean parameters are included. LÄS MER

  7. 25. Humidity Structures in the Marine Atmospheric Boundary Layer

    Magister-uppsats, Uppsala universitet/Luft-, vatten- och landskapslära

    Författare :Andreas Svensson; [2002]
    Nyckelord :marine boundary layer; air-sea interaction; Dalton number; turbulent fluxes; quadrant analysis;

    Sammanfattning : The turbulence structure over the sea was studied with the emphasis on humidity. The data sets used came from the island of Östergarnsholm outside Gotland in the Baltic Sea. The study included spectral and quadrant analyses of the wind, temperature and humidity parameters from one measuring level. LÄS MER