Monitoring changes in stream sedimentation resulting from forest land use is commonly conducted by intensive sampling of both suspended sediments and the incidence of fines within natural gravel substrates. An alternate simple indicator of both parameters is the measurement of the deposition of fines in containers of a standardized mixture of gravel free of fines. Replicate sets of these ‘sediment deposition traps’ were installed in coastal stream sites that provided a range of suspended sediment loadings. Deposition of fines as less than medium sands (<1.19 mm), less than fine sands (<0.30 mm) and silts and clays (<0.075 mm) were examined as functions of mean suspended sediment concentration (as mg.L-1), and sediment concentration times duration or ‘dose’ (as mg.L-1 .days). Deposition of fines was highly correlated with both mean concentration (r2 = 0.66, 0.80, 0.44 for the respective categories of fines) and dose (r2 = 0.68, 0.79, 0.40) after approximately 60 days. Relations were logarithmic indicating that ...
Larkin, G.A., Slaney, P.A.. 1996. Calibration of a Habitat Sedimentation Indicator for Use in Measuring the Effectiveness of Watershed Restoration Treatments. Ministry of Environment, Lands and Parks. Watershed Restoration Management Report. WRMR05
Topic: Watershed Restoration Program
Keywords: sediment, streams
Other Identifier: Ministry of Forests
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