DBPapers
DOI: 10.5593/SGEM2014/B52/S20.104

THE STRUCTURE AND TEXTURE OF THE TERRACE SEDIMENTS OF THE MURES RIVER AND THEIR ROLE IN DISPERSING ORGANIC POLLUTANTS

T. CIOBAN; I. A. IRIMUS; D. PETREA; S. ROSCA
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-18-6 / ISSN 1314-2704, June 19-25, 2014, Book 5, Vol. 2, 791-804 pp

ABSTRACT
This paper presents the reflex of the direct correlation between the Transylvanian
Depression’s tectonics and lithology (the inter-Carpathian depression of Romania), the laying of the terrace parts in the morpho-hydrographic basin of the Mureş, the structure and texture of the terrace sediments and the dispersion of the organic pollutants. The morphology of the terraces, the granulometry, the slope and their depth are premises in storing and dispersing the organic pollutants. The slope of the terrace sediments and the in situ pressure, alongside the physical and chemical properties of the contaminating agent determine the pollutants’ area of dispersion. The analysis and the evaluation were according to the data obtained from seasonal rhythmic drillings. At the same time, crisis situations induced by increased rainfall or severe drought, as were the accidents which came to pass due do careless usage of fuel or the precarious state of the installations and the storage and distribution equipment. The working methodology meant first and foremost identifying the polluted sites, locating the drilling perimeters, taking samples of the polluted area, analysing the specific type of pollutant. The taking of samples (through drilling), their laboratory analysis and the identification of the main types of pollutants created the data-base used throughout the scientific process. The analysed pollutants were: aliphatic hydrocarbons (TPH-GC), aromatic hydrocarbons (BTEX) and heavy metals (Pb, Cu, Ni, Zn). The intrusive investigations, done through dry drilling technology, with protective tubing, were made in the area of former locations of fuel deposits which are the main sources of pollution of the aquifers and the soil. The matrix analysis of the correlations between the type of sediment and the area of pollution was made through GIS
methodology. The study confirms a relation of inter-dependence between the structure and texture of the sediment and the dispersion area of the pollutant, horizontally and/or vertically, materialised through dispersion maps of the contaminating agent. The contaminated or the potentially contaminated perimeters were evaluated and hierarchized according to the negative impact generated by the pollutant, related to the structure and texture of the fluvial terrace sediment of the morpho-hydrographic basin of the Mureş River.

Keywords: terrace sediments, pollutants, storage, dispersion, Transylvanian Depression