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Titre : Comparison Of Total Water Storage Changes By Grace (gravity Recovery And Climate Experiment) With Satellite Gravimetry Method And Hydrometeorological Data

Uydu (grace) Gravimetri Yöntemi İle Belirlenen Su Kütlesi Değişimlerinin Ölçülmüş Hidrometeorolojik Verilerle Karşılaştırılması

Auteur : Kızılaslan, Mehmet Anıl

Université de soutenance : İstanbul Teknik Üniversitesi

Grade : Master of Science (MS) 2015

Résumé partiel
Water is a vital resource for every living thing on the Earth. The definition by Scientific Hydrological Committee of the US Federal Council for Science and Technology in 1962 is as follows :“Hydrology is a basic and an applied science that treats the waters of the Earth, their occurrence, circulation, and distribution, their chemical and physical properties, and their reaction with their environment, including their relation to living things”. Thanks to this definition, hydrology has become a subject matter studies by many other scientific disciplines. Hydrology has a interdisciplinary nature and is in close relation to such sciences as mathematics, physical, and chemistry. Global warming caused serious problems concerning water resources, which is thought to result in a decrease in agricultural and forestry products, energy shortage, a populations flow from coastal to central areas. For the preservation of eco-balance and a sustainable development of human communities, water resources should be exploited in the wisest way possible so as to satisfy the present and future need for water. Recently, due to the increasing importance of water, efficient use of water resources has been drawing more attention in Turkish academic milieu. It is crucial to monitor the fluctuations in the water levels in agricultural countries like Turkey. These variations are monitored via satellites and used as data in numerous studies. Comparing satellite data with hydrometeorologically obtained data increases the reliability the processed data. The present study analyses the variations in nine grid levels in Turkey relying on data obtained from GRACE (Gravity Recovery And Climate Experiment), which was launched in March 2002. The satellite is intended to determine the static gravity field of the Earth and its temporal changes. With this satellite, variations in the terrestrial water storage, tidal and atmospheric mass, and glacial mass can be monitored by means of temporal changes in the globe’s gravitational force. The measurement of earth’s gravitational force and its temporal variations and the determination of their interrelation to climatic changes are among the missions of GRACE. GRACE mission consists of two identical satellites orbiting about 220±50 km apart in a circular trajectory 460 km above the Earth at inclination of 89º to the equator. Intersatellite distances which are recalculated every 5 seconds and variations in these distances allow the researchers to monitor temporal mass variations.

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