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- Title
The stability of a remediated bed in Hamilton Harbour, Lake Ontario, Canada.
- Authors
Amos, Carl L.; Droppo, Ian G.; Gomez, Eduardo A.; Murphy, Tom P.
- Abstract
ABSTRACT In situ measurements of lakebed sediment erodibility were made on three sites in Hamilton Harbour, Lake Ontario, using the benthic flume Sea Carousel. Three methods of estimating the surface erosion threshold (τc (0)) from a Carousel time series were evaluated: the first method fits measures of bed strength to eroded depth (the failure envelope) and evaluates threshold as the surface intercept; the second method regresses mean erosion rate (E m ) with bed shear stress and solves for the floc erosion rate (E f ) to derive the threshold for E m = E f = 1 × 10-5 kg m-2 s-1 ; the third method extrapolates a regression of suspended sediment concentration (S ) and fluid transmitted bed shear stress (τ0 ) to ambient concentrations. The first field site was undisturbed (C) and acted as a control; the second (W) was disturbed through ploughing and water injection as part of lakebed treatment, whereas the third site (OIP) was disturbed and injected with an oxidant used for remediation of contaminated sediment. The main objectives of this study were: (1) to evaluate the three different methods of deriving erosion threshold; (2) to compare the physical behaviour of lacustrine sediments with their marine estuarine counterparts; and (3) to examine the effects of ploughing and chemical treatment of contaminated sediment on bed stability. Five deployments of Sea Carousel were carried out at the control site. Mean erosion thresholds for the three methods were: τc (0) = 0·5 (±0·06), 0·27 (±0·01) and 0·34 (±0·03) Pa respectively. Method 1 overpredicted bed strength as it was insensitive to effects in the surface 1–2 mm, and the fit of the failure envelope was also highly subjective. Method 2 exhibited a wide scatter in the data (low correlation coefficients), and definition of the baseline...
- Subjects
HAMILTON Harbour (Ont.); ONTARIO; CANADA; SEDIMENTS; SEDIMENTATION &; deposition
- Publication
Sedimentology, 2003, Vol 50, Issue 1, p149
- ISSN
0037-0746
- Publication type
Article
- DOI
10.1046/j.1365-3091.2003.00542.x