Analyses of suspended sediment loads in Slovenian rivers. Issue 6 (25th April 2016)

• Record Type: Journal Article
• Authors: Bezak, Nejc; Šraj, Mojca; Mikoš, Matjaž
• Is Part Of: Hydrological sciences journal. Volume 61:Issue 6(2016)
• Page Start: 1094
• Page End: 1108
• Publication Date: 2016-04-25
• Subjects: suspended sediment load -- frequency analysis -- seasonality -- extreme events -- trends -- lag analysis; Hydrology -- Periodicals; 551.4805
• DOI: 10.1080/02626667.2015.1006230
• Languages: English
• ISSNs: 0262-6667

Abstract

ABSTRACT: Suspended solids are present in every river, but high quantities can worsen the ecological conditions of streams; therefore, effective monitoring and analysis of this hydrological variable are necessary. Frequency, seasonality, inter-correlation, extreme events, trends and lag analyses were carried out for peaks of suspended sediment concentration (SSC) and discharge ( Q ) data from Slovenian streams using officially monitored data from 1955 to 2006 that were made available by the Slovenian Environment Agency. In total more than 500 station-years of daily Q and SSC data were used. No uniform (positive or negative) trend was found in the SSC series; however, all the statistically significant trends were decreasing. No generalization is possible for the best fit distribution function. A seasonality analysis showed that most of the SSC peaks occurred in the summer (short-term intense convective precipitation produced by thunderstorms) and in the autumn (prolonged frontal precipitation). Correlations between Q and SSC values were generally relatively small (Pearson correlation coefficient values from 0.05 to 0.59), which means that the often applied Q –SSC curves should be used with caution when estimating annual suspended sediment loads. On average, flood peak Q occurred after the corresponding SSC peak (clockwise-positive hysteresis loops), but the average lag time was rather small (less than 1 day).Editor M.C. Acreman;Associate editor Y. Gyasi-Agyei