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Owing to the fact that determining the temporal change at the coastline is highly significant in maintaining sustainable coastal development plant, this study focuses on the temporal coastline change in the south coasts of the Marmara Sea, which is one of the seas where coastal use and change is the most obvious. Therefore, old and new coastlines have been determined by using Landsat TM images with 30m resolution from the years 1984, 2003 and 2011 as well as colorful orthophotographs of the year 2008 with 0,45 cm resolution. Geometrical confirmation of satellite images were effectuated by using software and techniques of Erdas Imagine 10 and ArcGis 10 and then the coastal analyses from the obtained coastlines have been conducted. According to the result of the study, an area of 5,76 km² have been filled between Canakkale-Cardak and Yalova within 27 years of time between the years 1984 and 2011. The study also reached a conclusion that mining sand was effectuated in an area of 1,15 km² and thus the coast was pulled back. The line that was 521 km in 1984 reached 560 km in 2011. T he most obvious coastal change was seen to be in the coasts of Yalova, Gemlik, Mudanya and Bandirma. The coastal bend, located in Lapseki, Gonen, Karacabey and in the south of Kapidag Peninsula, still remains to be a natural coastline. Even though irregular settlements in the coastal areas of cities cut off people’s contact with the sea, the solution of filling the coasts was found for the purpose of recreating green spaces in the interest of the public. However, the coastal areas, which have sensitive ecological features, face with pressures of tourism and urban-based developments due to these landfills in the coasts. Therefore, coastal landfills in the southern coasts of the Marmara Sea gradually destroy the natural coastal spaces and the coastline also lost its original appearance. The population growth and pressures on using the land in the coastal areas have always continued and will continue in the future. Hence, it is essential have new regulations and sustainable permanent plans for long term uses in the future.

Analysis of Temporal Change Taking Place at the Coastline and Coastal Area of the South Coast of the Marmara Sea