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the sample solution treatment step: to the heating of bentonitic clay sample solution or clay old sand sample solution, stir, described bentonitic clay sample solution is that 1% sodium pyrophosphate solution 20mL and distilled water 50mL mix and constitute by 0.2g bentonitic clay, massfraction; Described clay old sand sample solution is that 1% sodium pyrophosphate solution 20mL and distilled water 50mL mix and constitute by 5g clay old sand, massfraction;.One.
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e. ST4–7, Table 1) with varying pore water salinities (Fig.g. As a comparison, Sutherland et al. (2014) investigated the settling of kaolinite clay suspensions within a mass concentration range Cscl = 14. up to one order of magnitude lower than the current study), while suspended sediment concentrations occurring in the turbidity maximum zone of estuaries can typically reach up to ∼10 to ∼15 g l−1. 11d). Thus, the sand-clay mixtures tested in the current study are more representative of hyper-concentrated, near-bed, fluid-mud layers and, consequently, are expected to display significantly different settling characteristics compared to these more dilute suspensions (which may also account, to some extent, for the different parametric influences on sedimentation rates observed). A possible reason for this parametric inconsistency may again arise from key differences in the mixture composition within the current experiments compared with previous studies, namely, the very high clay mass concentration range tested (i. Cscl = 84–285 g l−1 in ST runs, Table 1). 4) to result in higher initial settling rates for sand-clay mixtures with lower pore water salinities.e. This trend is clearly demonstrated from the measured temporal displacement of the upper interface for selected runs (i. as occurs in brackish estuarine waters) and, hence, result in increased sedimentation rates compared to those obtained in freshwater (Sutherland et al.7–39. 11c), and from corresponding sedimentation rates, which indicate larger and earlier peak settling rates occur for sand-clay mixtures with reduced pore water salinities (Fig.3 g l−1 (i.e. 2014) [note that the parametric influence of salinity on mud flocculation processes is also known to diminish for salinity values above ∼20 ppt]. This observed parametric dependence is again somewhat surprising given the expectation that some degree of salinity would be expected to promote flocculation within mud suspensions (e.The parametric influence of salinity on sedimentation rates (for otherwise identical conditions) is shown (Fig.
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