International Journal of Environment and Geoinformatics

1-11

Authors: A.Cemal Saydam

Iron enrichment hypothesis have been tested on many occasions by adding dissolved iron into the seawater. Though Mediterranean Sea never depleted with iron it is one of the most oligotrophic water that exists on earth. It’s shown that oceanic surface chlorophyll levels do in fact regulated by the wet desert dust deposition, independent of the nutritional load of the receiving body. The in cloud alteration of desert dust matrix and its biological content is in fact responsible from the reaction mechanisms initiated via the oxalate released by the prokaryotes. Solar light further enhances the formation of dissolved iron via decarboxylation reaction. Thus this paper explains the pathways of natural iron fertilization mechanisms that can be regulated by seeding the clouds with appropriate desert dust hence offers a means to control the chlorophyll concentration hence control on the negative feedback mechanisms on climate.

21-28

Authors: Ozan Arslan

This paper describes the photogrammetric techniques and approaches developed for 3D object reconstruction based on a single image. It is possible to get metric information from a single view when the stereo-based photogrammetric technique is not available. In this scope some advanced multidisciplinary techniques which allow an automatic capture of meaningful elements for perspective models from a single image are discussed

40-47

Authors: Denizhan Vardar, Hande Aykurt Vardar

Understanding the formation and evolution mechanism of the sandy deposits plays key role to define the hydrodynamics of the shelves and coasts. The barrier islands determined from high resolution chirp seismic reflection profiles, were started to deposit on the boundary (SB) that characterized by the lowstand stages of global sea level in the southern Marmara shelf near shoreface area. The unit haslost its activity at 55 ms, 60 ms depth in Erdek Bay, at 55 ms in Bandırma Bay, at 61 ms front of the Kocasu River. According to global sea level curves, this unit was evolved between 11000-11500 BP and10450-10150 BP. The geometrical situation and internal reflection character of these units indicate the balance between fluvial sediment transportation, marine intrusion and current systems in the study area. Belkis Isthmus that connects the Kapıdağ Peninsula to the mainland occurred synchronously with same process that formed the barrier islands. Bioherm structures were formed on the barrier islands and some of the bioherm’s uppermost surface is reached to 1 m below the sea floor. Bioherm structures are composing from organisms; formation and evolution depend on various stress factors. Barrier islands provide nutritional source to bioherms. Since these structures occur in a limited area, the development should be controlled by secondary factors. Biogenic gas determined from seismic sections closed to bioherm structures, probably plays the secondary role. Addition to this, during the forming and the growing of bioherms, Marmara Islands (Pasalimanı, Avşa, Marmara Islands) and Imralı Island were possibly control the currents and the flooding in the study area and provided convenient environment to these structures evolution.