Environmental Engineering Reference
In-Depth Information
13.3 Conclusions and Outlook
The paper has shown that ground-based acoustic remote sounding with a sodar can
give detailed information on the vertical profiles of wind and turbulence in the urban
boundary layer (UBL). Together with optical remote sensing from a celiometer,
the height of the mixing layer can be determined. From long-term measurement
campaigns with these instruments characteristic and important features of UBL
have been documented. Especially the turbulence profiles show, partly in interac-
tion with the surrounding rural boundary layer, significant peculiarities. Therefore,
these existing remote sensing data from UBLs form an important data set for the
evaluation and verification of numerical simulations for UBL. They can also help to
formulate proper parameterizations for an urbanization of the models.
Ground-based remote sensing is presently still a developing subject. The applica-
tion of radio-acoustic sounding systems (RASS) can bring measurements of vertical
temperature profiles (Emeis et al. 2009). A comparison of simultaneous measure-
ments with a sodar, a ceilometer, and a RASS can be found in Emeis et al. (2004).
Currently under development are measurement and data evaluation strategies to
measure turbulent fluxes by remote sensing (Engelbart et al., 2007 and Kouznetsov
et al., 2007). A rather new line of development is the measurement of boundary
layer winds with optical remotes sensing (Emeis et al., 2007c).
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