DOI: 10.5593/SGEM2014/B12/S2.015


M. Stanciucu
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-08-7 / ISSN 1314-2704, June 19-25, 2014, Book 1, Vol. 2, 107-114 pp

The Romanian border of the Black Sea is subjected since 1970 to an irreversible erosion process that affects mainly the southern part of it, from Constanta to Vama Veche. In spite of all efforts and measures, erosion rates of the beaches varies in the range of 20 m/year on the northern coast, to 5 m/year on the southern coast [8] while progressive landslides affects one by one all high cliff areas between them. One of the latest studies along the Black Sea border includes geotechnical boreholes with standard penetration tests and laboratory analyses on soils, light penetration tests, interpreted and correlated with geophysical investigations - longitudinal and transversal refraction seismic profiles, on 25 sites. This paper presents the synthesis of results of onshore and offshore geological and geotechnical investigations made by the author in order to provide correlations between geologic structure, geotechnical and geophysical properties of soils subjected to marine erosion. Variations of main geotechnical parameters derived from above mentioned investigations (grain size distributions, relative density, effective friction angle, stiffness moduli, dynamic moduli, etc.) are presented for the main geologic units. The most interesting results was provided by offshore seismic investigations which depicted in the southern part, the presence of a fault network inside the major structural units, on which vertical tectonic movements can be a major cause of long term coastal erosion and large scale landslides developed wherever the shore raise substantially above the sea level.

Keywords:erosion rate, stiffness moduli, seismic profiles.