EXPERIMENTAL INVESTIGATION OF TURBULENT PROCESSES IN A COMPLEX TERRAIN THOMASFOKEN*) Main Meteorological Observatory of the Meteorological Service of the GRD, Potsdam*) JAN PRETEL**) Institute of the Physics of the Atmosphere, CzechosL Acad. Sci., Prague**) PeamMe: Cooeu4alomea nepabte pe3k,~Ibmambt JneascOynapobnoeo 9tc cnepumeuma ,,K O HO KC-86 ". DKenepumeum npoaoOuaca e meuenue uton~ u uto~a 1986 e. ua ~conucmcKoi~ Memeopo:zoeuuec~o~ oecepaamopuu Hncmumyma ~Su3utcu am~toco~epbt A H rtCCP a pamtcax npoe~ma KAHF. FIpu nomo- ulu 4 atcycmuueet¢ux aneMo~tempoe na 4 ebwomax do 80 ~t, donmtepoeetcoeo coOapa u u~tepeuuft epaOueumoa etcopoemu aempa, me~mepamypbt u paOuaquu a cJtoe c 2 c)o 80 ~u npoaoc)u~¢ucb Komn~etcenbte uccJteOoeanu~t noepanuuuoeo cJtox amMocfSepbl. Agmopbt npe3Jtaeatom nepebte pexyetbmambt, ~¢aeato- ulueca - - uccneOoaauu~ aumponoeenubtx aosOe~cmeuft ua anepeemuuecnu~ o6meu e noepannuno~a cdoe amMoeo~epbt, --- 8/lUcqttUll nepeeetteuno~t /aeempnocmu na xapatcmepucmunu myp6yJlenmpuoemu u ua ux eepmulcaJtb- uoe pacnpede/tenue. S u m m a r y: In the present paper the first results of the international "'KOPEX-86" experiment are presented. The experiment took place at the Kopisty Atmospheric Observatory of the Institute of Physics of the Atmosphere in Prague as part era speeial project of the Commission of the Academy of Sciences in Planetary Geophysics (KAPG) in June and July 1986. Using 4 ultrasonic anemometers at 4 levels up to 80 m, Doppler-SODAR and wind-, temperature- and radiation balance gradients from 2 to 80 m, a complex investigation of the atmospheric boundary layer in an industrial area was made. The authors present the first results of -- the anthropogenic influence on the energy exchange in the atmospheric boundary layer, -- the influence of a complex terrain on the turbulent characteristics and their vertical distribution. 1. INTRODUCTION The investigation of turbulent exchange processes in industrial areas is, internationally, one of the most prominent experimental tasks. This is partly due to the substantial differences between the model equations as applied to the homogeneous underlying surfaces, which are used in many meso-seale models, and to the actual development of turbulent processes. Primary modifiers are the stratification and the roughness of the underlying surface, i.e. the relief and distribution of buildings and other structures. In recent years, a variety of relevant studies has been unertaken at the Kopisty Atmospheric Observatory of the Institute of the Physics of the Atmosphere Prague [1, 2], which were intended to be part of the preparations of an international experiment, *) Address: Telegrafenberg, Potsdam, DDR-1561 **) Address: Bo~ni II, 141 3l Praha 4-Spo~ilov 3] 8 Studla geoph, et geod. 31 [1987~