Mungov, G., & Daniel, P. (2000). Storm surges in the Western Black Sea. Operational forecasting. Mediterranean Marine Science, 1(1), 45-50.
(and I am working on the preparation of a new article/articles)
If the question is about the seasonal and climatic changes:
Stanev, Emil V., and Elissaveta L. Peneva. "Regional sea level response to global climatic change: Black Sea examples." Global and Planetary Change 32.1 (2001): 33-47.
Stanev, Emil V., Pierre‐Yves Le Traon, and Elissaveta L. Peneva. "Sea level variations and their dependency on meteorological and hydrological forcing: Analysis of altimeter and surface data for the Black Sea." Journal of Geophysical Research: Oceans (1978–2012) 105.C7 (2000): 17203-17216.
Tsimplis, M. N., et al. "On the forcing of sea level in the Black Sea." Journal of Geophysical Research: Oceans (1978–2012) 109.C8 (2004).
The papers are not specificaly for the Romanian coast , but valid also there
Also for the Bulgarian coast by may be helpfull:
Pashova, Lyubka. "ASSESSMENT OF THE SEA LEVEL CHANGE ON DIFFERENT TIMESCALES FROM VARNA AND BURGAS TIDE GAUGE DATA." COMPTES RENDUS DE L ACADEMIE BULGARE DES SCIENCES 65.2 (2012): 193-202.
also
Pashova L, I Yovev, Journal of environmental protection and ecology 11(2):791-801 available here: http://www.tour.teithe.gr/bss_project/get_file.php?f=17
Lericolais, G., Bulois, C., Gillet, H., Guichard, F., 2009. High frequency sea level fluctuations recorded in the Black Sea since the LGM. Global and Planetary Change 66, 65–75.