272 Urban Turbulence One-Dimensional Velocity Spectra from JU2003 Observation

Monday, 23 January 2017
4E (Washington State Convention Center )
Sam Chang, U.S. Army Research Laboratory, Adelphi, MD

 For  the 13th  Symposium on the Urban Environment-2017

               AMS Annual Meeting   

         To be held 22-26 January 2017, Seattle Washington

              Abstract Submission Deadline: 3 August 2016

              Acceptance E-mails Sent: Late September 2016 

      Urban Turbulence One-Dimensional Velocity Spectra

                            From JU2003 Observation 

                           Sam Chang and Giap Huynh 

   Battlefield Environment Division, Army Research Laboratory

                              Adelphi, MD 20783




   A simple analytical form is used to model turbulent velocity spectra. This form has two free constants which can be calculated by turbulence measurements with a non-linear curve fitting method. The Joint Urban 2003 (JU2003) field experiments were undertaken in Oklahoma City during the summer of 2003. Sonic anemometer data taken using Lawrence Livermore National Laboratory’s 83 m pseudo tower from JU2003 are analyzed. We present the results of characteristics of the urban turbulence velocity spectra. In particular we focu on   

the features of spectral peak frequency and wavelength. Their variations with wind direction, atmospheric stability, within and above the urban canopy are discussed in detail.

Corresponding author address:

Dr. Sam Chang, E-mail : sam.s.chang2.civ@mail.mil

                           Tel:    (301)394-1988    Fax: (301)394-4797

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