Evening Transition by a River Sampled Using a Remotely-Piloted Multicopter |
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| Authors: | B Wrenger J Cuxart |
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| Institution: | 1.Hochschule Ostwestfalen-Lippe,H?xter,Germany;2.University of the Balearic Islands,Palma de Mallorca,Spain |
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| Abstract: | Measurements made with instruments aboard a remotely-piloted multicopter flying across the Weser river in Germany provide information on the thermal structure of the boundary layer over the river and adjacent land, in this case in summer for late afternoon, the evening transition and early night on a clear calm day. The river has a characteristic width of 100 m. The stratification over the land and river are of opposite signs at the lower levels, except during part of the evening transition. The multicopter allows to qualitatively estimate the evolution of the thermal contrast between both surfaces, showing that the river banks experience very significant daytime cooling and nocturnal warming due to river-bank circulations, with the change of sign taking place well before sunset. |
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