DBPapers
DOI: 10.5593/SGEM2014/B31/S12.107

WATER FLOW AND SILTATION OF THE SUPPLY CHANNELS IN RAZELM-SINOE ECOSYSTEM, AS PART OF THE DANUBE DELTA

N. Petrescu, S. Mircea, A. Virsta, R. Taralunga
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-13-1 / ISSN 1314-2704, June 19-25, 2014, Book 3, Vol. 1, 837-844 pp

ABSTRACT
Continuous hydrological measurements carried out by the authors in the period 2009 - 2013 on some channels from the Danube Delta, such as Fundata, Fundea, Mustaca, Dunavat and Dranov, show that annual average turbidity of suspension alluvia of Danube discharge is 214 g/m3 as compared to 206 g/m3 in 2009, as the reference level for the 1989-2013 period. From statistical analysis of secular variation of the water turbidity in the Danube Delta it was found out a sensitive decreasing tendency, caused mainly due to the hydrotechnical works, like check dams that were build up in the Danube Delta catchment, but also due to the hydrological drought from recent period of time, excepting year 2010 when the historical flow of Danube River was 17,900 m3/s at the Delta entrance. In the meantime, measurements done by the authors together with specialists from two research institutions, AQUA PROJECT and ICIM Bucharest, for the same period of time, have revealed that some of the supply channels of Razelm - Sinoe system are fill up to about 30-40% (flow section) in comparison with 20% in 2009 and the adjacent channels of the Danube Delta between the Saint Gheorghe channel, the Black Sea and the water system are completely fill up, as they were in year 2009. Based on the same measurements the authors checked out the already known correlations between fluid and solid flows in the main supplying channels of Razelm-Sinoe River System. In this respect, for the analyzed period of 2009-2013, the paper highlights the essence of the physical phenomenon of alluvia transport for developing computational models that accurately reproduce this phenomenon, and also shows that between fluid and solid flow there are distinctly significant correlations for the Fundea, Fundata and Dranov channels, and significant correlations for the Dunavat and Mustaca channels.

Keywords: siltation, fluid flow, solid flow, turbidity, drive critical effort.