The Effect of the Peak Discharges of River Danube on Istanbul Strait (Bosphorus)

Abstract

The Bosphorus Strait is the meeting point of Black Sea and Marmara Sea. It is under influence of many hydrological, oceanographical and meteorological variables. Clearly, it is known that River Danube discharge reaches to Bosphorus Strait. The approximate distance between outlet of River Danube and northern end of Bosphorus Strait are nearly 500km. In this study, the influence of the peak river Danube discharges (higher than 11000 m3/s) on Bosphorus Strait is investigated by using dataset of TAISEI Corporation, ISKI, Turkish State Meteorological Service and GRDC. To this end, the time series of water temperature, water salinity, and water level of the northern Bosphorus Strait is examined together with time series of River Danube discharge between 1st Oct 2004 and 31st Sept 2005. The validation is performed by checking wind speed, air pressure and precipitation data on Bosphorus Strait during that time. In addition, the power spectra of River Danube is calculated and compared with the other datasets as water level, surface layer water salinity and finally, surface water temperature data at the northern end of Bopshorus Strait.

Keywords

• Strait of Istanbul,water level,the Bosphorus Strait,power spectra,River Danube,Lag time

References

1. 1) Ozsoy, E., Latif, M.A., Sur, H.I., Goryachkin, Y., 1996. A review of the exchange flow regime and mixing in the Bosphorus Strait. Bulletin de l’Institut Oceanographique, Monaco, no. special, CIESM Science Series nu 2, 187–204.
2. 2) Sur, H.I., Ozsoy, E., Unluata, U., 1994. Boundary current instabilities, up welling, shelf mixing and eutrophication processes in the Black Sea. Progress in Oceanography 33, 249-302.
3. 3) Şen, Olgay & Saçu, Şehriban & Erdik, Tarkan & Duricic Erdik, Jasna & Ozturk, Izzet. (2019). Investigation of Northern Bosphorus Flow Structure with River Danube.
4. 4) Unluata, U., Oguz, T., Latif, M.A., Ozsoy, E., 1990. On the physical oceanography of Turkish Straits. In: Pratt, L.J. (Ed.), The Physical Oceanography of Sea Straits. NATO/ASI Series. Kluwer, Dordrecht, pp. 25–60.
5. 5) Yuksel, Y., B. Ayat, M. N. Ozturk, B. Aydogan, I. Guler, E. O. Cevik, and A. C. Yalciner. 2008. Responses of the stratified flows to their driving conditions. A field study. Ocean Engineering 35(13):1304–1321.