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http://dx.doi.org/10.17663/JWR.2017.19.3.303

Study of Settling Properties of Cohesive Sediments  

Choi, In Ho (Department of Civil Engineering, Seoil University)
Kim, Jong Woo (Department of Civil Engineering, Seoil University)
Publication Information
Journal of Wetlands Research / v.19, no.3, 2017 , pp. 303-310 More about this Journal
Abstract
This paper is to understand the settling properties of cohesive sediments under effects of ions in turbulent flow. The experiments were conducted using a miniature annular flume(mini flume) with a free water surface. Silica was used as sediment of experiment. The suspended concentrations were measured by using a CCD-Camera. Settling of silica($SiO_2$) was allowed to occur under various shear stresses in a concentration of 7g/L. At condition of pH 4.2 and high NaCl concentration, the floc size D of silica was larger than D at condition of pH6.8 with the bed shear stress increasing. The settling velocity $W_s$ of silica was higher at condition of 10g NaCl/L than $W_s$ at condition of pH4.2. Comparison of measured concentration-time curves and concentration-time curves calculated by this study showed similar tendency in flow under effects of ions.
Keywords
Settling properties; Ions; Miniature annular flume; Shear stress;
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Times Cited By KSCI : 3  (Citation Analysis)
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