Size distribution and settling velocities of suspended particles in a tidal embayment

被引：29

作者：

Ahn, Jong Ho ^{[1
]}

机构：

[1] Korea Environm Inst, Div Water & Environm, Seoul 122706, South Korea

来源：

WATER RESEARCH | 2012年 / 46卷 / 10期

关键词：

Estuary; Suspended sediment; Particle size distribution; Settling velocity; Maximum entropy classification; Water quality; ESCHERICHIA-COLI; WATER-QUALITY; FECAL INDICATORS; COASTAL WATER; NEWPORT BAY; SEDIMENT; INSTRUMENT; ESTUARINE; FLOCCULATION; PERSISTENCE;

D O I：

10.1016/j.watres.2012.03.038

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Field studies were carried out to investigate seasonal and bay-wide variations in the particle size distributions (PSDs) and settling velocities of suspended particles in Newport Bay, the second largest tidal embayment in southern Califomia. Maximum Entropy Classification (MEC) of the data identified three PSD groups: (1) suspended particles with a single mode around 10-20 mu m (Group 1), (2) suspended particles with a single mode similar to Group 1, but shifted to smaller particle sizes (Group 2), and (3) suspended particles with a coarse mode at around 100 mu m (Group 3). The three PSD groups have distinct seasonal and spatial patterns, and different size-settling velocity relationships, consistent with the hypothesis that Newport Bay longitudinally fractionates allochthonous particles from its tributaries by both size and settling velocity, and generates large and fast settling autochthonous particles, probably in the form of biological debris. Particle concentrations in Groups 1 and 2 are significantly correlated with fecal indicator bacteria, suggesting possible linkages between fecal pollution and particle transfer in this tidal embayment. (c) 2012 Elsevier Ltd. All rights reserved.

引用

页码：3219 / 3228

页数：10

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