DBPapers
DOI: 10.5593/SGEM2014/B31/S12.011

ASSESSMENT OF SILTING UP AND TREND OF WATER QUALITY IN CHOTARNY CHANNEL

R. Dulovicova, Y. Veliskova
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, 81-88 pp

ABSTRACT
The article presents the current situation of silting up in one of three main channels of the Žitný ostrov channel network at Southern Slovakia – in the Chotárny channel. This channel network was built up for drainage and irrigation. From the view of mutual interaction between channel network and groundwater it has been necessary to judge the impact of channel network silting up by alluvials on this interaction. The rate of crosssection profiles aggradation along this channel was evaluated from the field measurements in 2012. The Žitný ostrov area is one of the most productive agricultural areas of Slovakia because of its favourable climate, soil and morphological conditions. For this reason there exist also several requirements to the quality of water in the channel. The course of quality in this channel was evaluated statistically from accessible data of Slovak Hydrometeorological Institute database (SHI). The indicators of water quality were monitored in one monitored profile at Chotárny channel in rkm 10,0 - Jánošíkovo na Ostrove during period 1991 – 2006 ( with focus to the same season as the field measurements in 2012 were performed). Unfortunately, longer range of data was not available. There was evaluated the trend of water temperature, pH values, conductivity and concentration of suspended solids and total dissolved solids (TDS). The results are presented by graph forms. The grade of aggradation along the Chotárny channel during measured period ranges from 13,30 – 55,52 % of discharge area. The values of pH in rkm 10,0 during period of 1991 – 2006 run the values 7,2 - 8,3 and show explicitly decreased trend, the course of temperature during this period was balanced, oscillating between 15,95°C and 24,10°C. The course of conductivity during evaluated period is evidently fluctuated, from minimum 34,25 mS.m-1 to maximum 54,5 mS.m-1. The average value of this indicator was 43,10 mS.m-1, standard deviation of time series was 5,44 mS.m-1. The course of suspended solids concentration had similar character as conductivity, with minimum 232 mg.l-1 and maximum 412 mg.l-1. The average value of this indicator was 296,27 mg.l-1 with standard deviation 45,28 mg.l-1. The course of TDS had descended trend, with minimum 2 mg.l-1 and maximum 30 mg.l-1.

Keywords: silting up, channel network, water quality, interaction of surface and groundwater, Chotárny channel