BOSPHORUS: IS THE PASSAGE GETTING SAFER?

Bosphorus: Is the passage getting safer?

Birsen Koldemir

Istanbul University, Engineering Faculty, Dept. of Maritime Transportation and Management, Avcilar Campus, Avcilar, Istanbul, TURKEY

Abstract

The Bosphorus (Istanbul Strait) is the most critical passage in the World for vessels passing through; mainly due to its narrowness, its shape with several sharp turns and headlands which limit to have an extended sight for a proper look-out and close the view behind, complex as well as day-to-day changing nature of its currents. The localities with high risk for grounding or stranding in the Bosphorus are: Umur Banki, Yenikoy,Bebek, Kandilli; for collisions the evidence suggests that critical areas are Besiktas, Bebek, Kandilli, Kanlica, Yeniköy,Beykoz and Sariyer. The Montreux Convention relating to freedom of passage and navigation establishes and regulates the regime with certain formalities for a merchant and naval vessel since 1936. The Strait is kept open for shipping traffic day and night, and serves as an international waterway of commercial importance. Turkish Government has taken constructive steps forward to enhance navigation and environmental safety in the Region, the Strait of Istanbul inclusive, by implementing maritime traffic regulations and setting VTMIS which is fully operational since mid-2003. So far, the outcome is promising, and the annual rate of casualty has decreased significantly. However, it is too early to judge how far the VTMIS has been effective in achieving the ultimate goal.

Keywords: Strait of Istanbul, Vessel Traffic and Information System (VTMIS), shipping casualty, shipping traffic,Traffic Separation Scheme (TSS)

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INVESTIGATIONS ON THE SEDIMENT OF LAKE VAN II. HEAVY METALS, SULFUR, HYDROGEN SULFIDE AND THIOSULFURIC ACID S-(2-AMINO ETHYL ESTER) CONTENTS

Investigations on the sediment of Lake VAN II. Heavy metals, sulfur, hydrogen sulfide and thiosulfuric acid S-(2-amino ethyl ester) contents

B. Öztürk, N. Balkis, K.C. Güven, A. Aksu, M. Görgün, S.Ünlü, N. Hanilci

Istanbul University, Faculty of Fisheries, Ordu Cad. No : 200, Laleli, Istanbul, TURKEY
Istanbul University, Institute of Marine Sciences and Management,Müsküle Sok. 1, Vefa, Istanbul, TURKEY
Turkish Marine Research Foundation (TUDAV) Beykoz, Istanbul, TURKEY
Istanbul University, Engineering Faculty, Dept. of Geology, Avcilar, Istanbul, TURKEY

Abstract

Fe, Mn, Pb, Cu, Zn, Ni, Cd and Cr contents were determined by AAS in sediment of Lake Van. Cadmium and nickel levels were found high. The sulfur forms were detected as precipitated, octa-sulfur and 1,2,3,5,6 pentathiepane by GC/MS. Thiosulfuric acid S –(2 – amino ethyl ester) was detected first time in sediment by GC/MS analysis. This compound was also found in algae by our labroratory. The origin was probably due to marine organisms. Hidrogen sulfide content was determined in Van Lake sediments 265.2 – 639.2 µg/g.

Keywords: Lake Van, metals, sulfur forms, thiosulfuric acid S –(2 – amino ethyl ester), hydrogen sulfide

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CHECK-LIST OF THE FRESHWATER ALGAE OF TURKEY

Check-list of the freshwater algae of Turkey

Veysel Aysel

Çanakkale Onsekiz Mart University, Faculty of Science and Arts, Biology Department, Çanakkale, TURKEY

Abstract

The freshwater algae of the lakes, dam lakes, streams, brooks, puddles, thermal springs, marshes of Turkey based on literature records are listed in this study. 179 studies have been carried out by different workers, in which 2030 taxa were identified [(354 Cyanophyceae, 159 Euglonidea, 24 Dinophyceae, one (I) Bangiophyceae, five (5) Florideophyceae, 378 Chlorophyceae, one (I) Pleurastrophyceae, seven (7) Charophyceae stricto sensu, eight (8) Euphyceae, 266 Conjugophyceae, five (5) Cryptista, two (2) Fucophyceae, 25 Xanthophyceae, nine (9) Chrysophyceae, four (4) Synurophyceae, 63 Coscinodiscophyceae, 101 Fragilariophyceae, 617 Bacillariophyceae and one (1) Bicoecea]. 18 taxa were given as new record for the freshwater algal flora of Turkey.

Keywords: Algae, freshwater, Turkey

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