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Θερμική καταγραφή εισροής υδάτων στο τεχνητό φράγμα Ποταμών, Ρεθύμνου, με πρότυπο μη επανδρωμένο εναέριο όχημα.

Zervos Panagiotis

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Summary

The purpose of the current dissertation is the low-cost construction of an Unmanned Aerial Vehicle (UAV) for the reception of remote-sensing thermal images, so that the water inflow in the artificial dam reservoirs, Potamoi, Amari, Rethymno, Crete can be located, imprinted and assessed. This flying platform has been developed aiming to make the most of innovative applications, related to the Science of the Engineer of Mineral Resources.This study also includes the process of thermal images of the area, their geometric reductions and the creation of two mosaics, through the combination of 370 shots for the detailed mapping and imprinting, even of the unpredictable water inflows in the reservoir. Then, the image information was transformed in the local geodetic coordinate reference system, so that it could be correlated with the ground, using photostable (thermal targets) during the day of the thermal recording.This particular thermal mapping has been selected to be conducted by means of a flying platform and thermal sensors, because the latter has an advantage over the ground and conventional remote sensing methods, for fast and more effective scanning of inaccessible areas. The applied thermal mapping imprinted temperature differences effectively (a related study was never conducted after its construction in 2009 by Organization for the Development of Western Crete) between the wet and dry soils and contributed to the clear separation of their properties and characteristics. The imprinted area is the southern side of the dam in which the main feed of the reservoirs takes place, fed by the St. Antonios gorge and the Kefalovryssa spring.At first, the prototype unmanned aerial platform was constructed as a hexacopter. Then, the thermal sensor and the wireless transmission data system were adapted on it, with the aim to transmit image data to a ground station. The flying platform had also an autopilot system, which could lead the craft to specific waypoints through the GPS (Global Positioning System) system. The autonomy of this flying system was 10 minutes for 5.5 kg maximum takeoff weight. The flights of thermal imprinting were conducted in the area of interest by means of the autopilot system and use of remote control. The covered area was 1.200 m2 and two mosaics were created: one for the morning and one for the midday thermal recording. Finally, after those mosaics were processed and interpreted, an unwanted water inflow in a specific position of the reservoir was detected, next to the river of the main feeding, which is a valuable source of information for the administrator of Amari dam. The flying platform will remain in the Laboratory of Geodesy and Geomatics Enigineering of the Technical University of Crete and it can become a point of reference for further development of the branch of UAVs in this University.

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