期刊
WATER ENVIRONMENT RESEARCH
卷 83, 期 4, 页码 347-357出版社
WATER ENVIRONMENT FEDERATION
DOI: 10.2175/106143010X12851009156006
关键词
suspended solids; suspended sediment; stormwater; runoff; autosampler; organic; specific density
A new depth-integrated sample arm (DISA) was developed to improve the representation of solids in stormwater, both organic and inorganic, by collecting a water quality sample from multiple points in the water column. Data from this study demonstrate the idea of vertical stratification of solids in storm sewer runoff. Concentrations of suspended sediment in runoff were statistically greater using a fixed rather than multi-point collection system. Median suspended sediment concentrations measured at the fixed location (near the pipe invert) were approximately double those collected using the DISA. In general, concentrations and size distributions of suspended sediment decreased with increasing vertical distance from the storm sewer invert. Coarser particles tended to dominate the distribution of solids near the storm sewer invert as discharge increased. In contrast to concentration and particle size, organic material, to some extent, was distributed homogenously throughout the water column, likely the result of its low specific density, which allows for thorough mixing in less turbulent water. Water Environ. Res., 83, 347 (2011).
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