The Textural Character Of The Littoral Sediments Between Sfântu Gheorghe And Gura Portiţa

• Main Author: OPREANU, Gicu
• Format: Text
• Language: unknown
• Published: Zenodo 2005
• Subjects: littoral sands, clayey silt, textural parameters, bimodal character, sediment transport; Van Veen; Dun; Rojas; Bowles; Eros; Sakhalin
• Online Access: https://dx.doi.org/10.5281/zenodo.57395; https://zenodo.org/record/57395

Abstract. This paper is based on grain size analyses performed on 250 sediment samples collected with the Van Veen grab from water depths of 0 to 20 meters in the littoral area of the Black Sea situated between Sfântu Gheorghe village and Gura Portiţa. As a result of analyzing the distribution of the types of depth sediments, it has been noted that along the entire length of the area under study littoral sediments consisting of well-sorted sands with skewness levels ranging from –0.41 to 0.60 are to be found between 0 and 7 meters. At water depths between 7 and 20 meters there are frequent sediments consisting of clayey silt, followed by clay, poorly sorted and with skewness values ranging from 0.10 to 0.85. The percentage of sand in the composition of sediments (closely connected to the average diameter of the particles) decreases in a linear fashion with depth, suggesting a possible direction of transport of the sand particles from the littoral area out towards the open sea. By interpreting the grain size parameters it was noted that sandy sediments tended to move from North to South, East of Sakhalin Island. South of Sakhalin Island it is impossible to estimate in which direction sediment is being transported based on the sizes of the sand grains. This is due to the presence of organogenous particles resulted from shells, whose larger dimensions upset the normal distribution of textural parameters. : {"references": ["Anastasiu N., Jipa D., 1983 - Texturi \u015fi structuri sedimentare. Editura", "Tehnic\u0103 Bucure\u015fti", "Folk R.L., Ward W. C., 1957 \u2013 Brazos River bar, a study in the significance", "of grain size parameters. Jour. Sed. Petrology, 27/ 1", "Gao, S., and Collins, M., 1992 \u2013 Net sediment transport pattern inferred", "from grain-size trends based upon definition of \u201etransport", "vectors\u201d. Sediment Geol.. 80/1992 47-60", "Giosan, L., Bokuniewicz, H., Panin, N., Postolache, I., 1998 - Longshore sediment", "transport along Romanian Danube Delta coastal zone.", "GEO-ECO-MARINA 3/1998 11-24 Bucharest", "Le Roux, J.P., Rojas, E.M., 2004 \u2013 Sediment transport pattern determined", "from grain size parameters Int. Workshop HWK Delmerhorst 15-", "16 apr. 2004 \u2013 From Particle Size to Sediment Dynamics", "Mc.Laren, P., Bowles, D., 1985 \u2013 The effects of sediment transport on", "grain size distribution, J. Sediment Petrol. 55/ 1985 457-470", "Panin, N., Jipa, D., 1998 - Danube river sediment input and its interactions", "with the North\u2013Western Black Sea result of EROS Projects.", "GEO-ECO-MARINA 3/1998 23-35 Bucharest", "Parrad o, J.M. Achab, M., 1999 - Grain\u2013size trends associated with sediment", "transport pattern in Cadiz Bay (South-West Iberian", "Peninsula)", "Boletin Instituto Espanol de Oceanografia 15 (1-4)", "1999. - 269-282 Cadiz", "Panin N., et al. \u2013 Monitoringul geoecologic al sistemului Dun\u0103re-", "Delt\u0103-Litoral-Marea Neagr\u0103, Centrul Rom\u00e2n de Geologie \u015fi Geoecologie", "Marin\u0103", "Shepard F.P., 1954 - Nomenclature based on sand-silt-clay rations.Jour,", "Sed. Petrology 24/1"]}