A model study on the role of Istanbul fish co-operatives at Turkish fisheries
Metin Timur, Kadir Doğan
Istanbul University Faculty of Fisheries, 34470. Laleli, Istanbul, TURKEY
In Turkey, the total fish catch was about 580.000 tons, of which 86 per cent came from the marine environment in 2000. It is observed that considerable amount of fish catch have been performed via fishery co-operatives. The first co-operative of fisheries was established in 1949 in Istanbul. There are 34 fish co-operatives in the vicinity of Istanbul and the total number of the members is 2.427 and vessels 2.170 in 2002. The catched fish is sold in Istanbul fish market. The total marketing capacity was about 40.000 tons in 2002. This paper primarily focuses on the working and potentials of the Istanbul fish co-operatives.
Keywords: Istanbul fish co-operatives, model study, Turkish fisheries
Water exchange in the Golden Horn
Bedri Alpar, Hüseyin Yüce, Ahmet Türker
Istanbul University, Institute of Marine Sciences and Management, Marine Geology and Geophysics Department, Vefa, lstanbul, TURKEY
Gemi Sanayi A.S. Tophane, Istanbul, TURKEY
Department of Navigation, Hydrography and Oceanography, Çubuklu, Istanbul, TURKEY
The water circulation in the Golden Horn estuary is mainly dominated by coupling with the flow in the Strait of Istanbul, which is subject, depending on the atmospheric factors and the water budget, to many nonlinear transient variances such as temporary blocking of the flows in either direction. The present paper describes observations of the water mass structure and circulation in the Golden Horn on the basis of recent oceanographic data.
Keywords: Golden Horn, current, sea level, water exchange
Physical properties of beachrocks on the coasts of Gelibolu Peninsula and their contribution to the Quaternary sea level changes
T. Ahmet Ertek, A. Evren Erginal
Istanbul University, Geography Department 34459, Beyazit, Istanbul, TURKEY
Beachrock formation developed at two different localities at the coasts of Gelibolu Peninsula. Geomorphological, geological, and tectonic properties of the coastal area have been considered in this study. All beachrock localities have been investigated in detail considering their material types, sequences, structures and depositional localities. It was concluded that the beachrocks observed in a distance of 8 to 15 meters from the present shoreline were found under the present sea and they have been tectonically uplifted. Sea level changes and tectonic activity of the coastal area have been explained owing to the properties of these young formations.
Keywords: Beachrock, sea level change, Gelibolu Peninsula, Gulf of Saros, Strait of Çanakkale
Tsunami hazard assessment in Istanbul
B. Alpar, Y. Altinok, C. Gazioglu, Z.Y. Yücel
Istanbul University, Institute of Marine Sciences and Management, Marine Geology and Geophysics Department, Vefa, Istanbul, TURKEY
Istanbul University, Engineering Faculty, Department of Geophysics, 34850 Avcilar, Istanbul, TURKEY
Istanbul University, Institute of Marine Sciences and Management, Marine Environment Department., BERKARDA Remote Sensing and GIS Laboratory Vefa, Istanbul, TURKEY
Historical tsunami events have impacted the Istanbul coasts along the Sea of Marmara. Offshore seismic sources may trigger these tsunamis directly or through coseismic underwater failure. The 1999 Izmit Bay tsunami led to more comprehensive analyses of these events which are generally caused by underwater failures close to the target coastline. Waves so generated can arrive at nearby coastlines in minutes, causing extensive damage and loss of life. Here this paper propose, on the basis of tsunami models in the Sea of Marmara and methodology used internationally, first generation tsunami inundation maps for the areas along the southern coast of Istanbul. Such maps for selected areas help to understand the possible effects on those regions and should only be used for evacuation planning and reducing possible hazard.
Keywords: Tsunami, hazard, inundation, Sea of Marmara, Istanbul, underwater failures