Flow class analyses of suspended sediment concentration and particle size in a mixed-land-use watershed

Knowledge gaps remain concerning fundamental suspended sediment physical processes/relationships, such as particle size class dynamics and hydroclimatic variability. Streamwater grab samples were collected four times per week (Oct. 2009–Feb. 2014) at nested-scale gauging sites (n = 5), representing...

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Bibliographic Details
Published in:The Science of the total environment 2019-01, Vol.648, p.973-983
Main Authors: Kellner, Elliott, Hubbart, Jason A.
Format: Article
Language:English
Subjects:
Experimental watershed study
Flow class
land use
Land use impacts
Laser particle diffraction
Particle size
stream flow
streams
Suspended sediment
urban areas
urbanization
watersheds
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Summary:Knowledge gaps remain concerning fundamental suspended sediment physical processes/relationships, such as particle size class dynamics and hydroclimatic variability. Streamwater grab samples were collected four times per week (Oct. 2009–Feb. 2014) at nested-scale gauging sites (n = 5), representing contrasting dominant land use practices. Streamflow was monitored in situ. Grab samples were analyzed for total suspended sediment concentration and mean particle size using laser particle diffraction. Comparisons were performed of suspended sediment parameters corresponding to different streamflow classes (i.e. 20th, 40th, 60th, 80th, and 99th percentile flows). Average suspended sediment concentrations displayed a decreasing trend from the predominately agricultural headwaters to the urbanized mid-watershed, and a subsequent increase to the suburban lower watershed. Results indicated significant (p 
ISSN:0048-9697
1879-1026
DOI:10.1016/j.scitotenv.2018.08.187