Day 7 (Wednesday 6 August 2014)

Day 7 of the OSTIV Congress began with a presentation by J. Durman (Germany). His paper was related with Analyses of common conceptual model for the kinematics of atmospheric gravity waves. The common model of thought to explain the kinematics of atmospheric gravity waves by the idea of a ballooning air parcel in a stable stratified air mass under wind shift was questioned critically. A more elaborated conceptual model based on horizontal pressure differences occurring in vertically oscillating air masses was presented. The conclusive derivation of a longitudinally acting wave propagation mechanism has provided the key for a vivid and coherent understanding of the generation and propagation of different types of gravity waves for glider pilots.

The second presentation with the title of “Analysis of the forest health state based on multispectral images acquired by Unmanned Aerial Vehicle was presented by M. Kacprzak. This paper is a co-perative study prepared with collaborations of P. Czapski, , J. Kotlarz, K. Mrowiec, K. Kubiak and M. Tkaczyk, from Institute of Aviation, Warszawa and from
Forest Research Institute, Raszyn, Poland. The main purpose of this study was to present the current progress of the work associated with the use of a lightweight unmanned platforms for various environmental studies. Current development in information technology, electronics, and sensors miniaturization has allowed mounting multispectral cameras and scanners on Unmanned Aerial Vehicle that could only be used on board aircraft and satellites. In this paper applicability of multispectral images analysis acquired several times during the growing season from low altitude (up to 800m) were presented. Mr. M. Kacprzak discussed remote sensing indicators computed by our software and common methods for assessing state of trees health. The correctness of applied methods was verified using analysis of satellite scenes acquired by Landsat 8 OLI instrument (Operational Land Imager).

The third presentation related with “Soaring Flights on Thermal Waves” was given by C. Lindemann (FU- Berlin, Germany). Some soaring flights of the author and some experiences over the North German plain of thermal waves above well developed cumulus were discussed as below: If there was no cloud street wind profile was detected but only very slow wind speeds, but the profile above cloud base had constant wind direction and increasing speed. The waves formed not earlier than at approximately at time of maximum surface warming. C. Linmedann explained some examples on their research activities together with satellite data and pictures.

The last presentation was delivered by K. Uysal from Turkish Aeronautical Association, İnönü Training Centre, Gliding School in Turkey. This paper was on the formation of urban heat island in Eskişehir (by A. Tokgözlü, B. Gönençgil, E. Özkan, K. Uysal and E. Yadsıman, Süleyman Demirel University, Isparta, Turkey; Istanbul University, Istanbul, Turkey; Turkish Aeronautical Association, İnönü, Gliding School, Eskişehir, Turkey). The summary of her presentation was about contemporary metropolitan cities, as a result of lessening green areas and evaporation surfaces, increasing asphalted surfaces and built areas meteorological parameters change. This differentiation between urban areas and surrounding semi-rural and rural areas was determined as ‘urban heat island’. The climate parameters are changing as a result of rapid and rapid urbanization in Eskişehir. The meteorological differentiations and urban heat islands at regional scale in Eskişehir metropolitan area caused by the changes in land use and land coverage since 2000 years were discussed in this paper. The relations between densities of built up areas, green areas and meteorological parameters had been put forwarded through meteorological measurements.