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Comparison of Settleable and Non-settleable Suspended Sediment in Streams and Lakes  

Eum, Jaesung (Department of Environmental Science, Kangwon National University)
Jung, Sungmin (Department of Environmental Science, Kangwon National University)
Choi, Yongsoon (Department of Environmental Science, Kangwon National University)
Lee, Hyungjin (Han River Environment Research Center, National Institute of Environmental Research)
Choi, Joongdae (Department of Regional Infrastructure Engineering, Kangwon National University)
Kim, Bomchul (Department of Environmental Science, Kangwon National University)
Publication Information
Journal of Korean Society on Water Environment / v.28, no.2, 2012 , pp. 232-237 More about this Journal
Abstract
Total suspended solids (TSS), settleable suspended solids (SSS) and nonsettleable suspended solids (NSSS) were compared in streams and lakes during rain events. Samples were collected in Lake Soyang and nine agricultural streams during storm events over two years. To measure NSSS, samples were settled in 1 L cylinders for one hour and then 50% of the total sample volume was taken from the center of the cylinder. The SSS/TSS ratio in streams (0.50) was higher than in Lake Soyang (0.20). The ratio of TSS to turbidity decreased from 1.21 in the inflowing river to 0.69 in the reservoir outlet. Turbidity and NSSS showed higher correlation ($r^2$=0.82) compared with the correlation between turbidity and TSS ($r^2$=0.66). Median particle size decreased from $11.4\;{\mu}m$ in the inflowing river to $4.2\;{\mu}m$ in the lake outlet. The results indicate that only fine particles of less than $5{\sim}10\;{\mu}m$ can be transported downstream of the lake. Because fast-flowing water in streams includes not only fine particles but also coarse particles, an overestimation of suspended sediment concentration results if only TSS is measured. Consequently, TSS and NSSS should be measured separately to evaluate the effect of suspend sediment loadings of turbid streams on aquatic habitat during the monsoon season.
Keywords
Nonsettleable suspended sediment; Settleable suspended sediment; Total suspended solids; Turbidity;
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Times Cited By KSCI : 1  (Citation Analysis)
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