CGRG Bibliography of Canadian Geomorphology
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Author : De Boer, D.H.; and Stone, M.
Date : 1998
Title : Spatial and temporal variability in fractal dimensions of suspended solids in two southern Ontario rivers.
Publication : Modeling soil erosion, sediment transport and closely related hydrological processes. Edited by: W. Summer, E. Klaghofer and W. Zhang. IASH Publication
Issue : 249:
Page(s) : 445-453.
Abstract
Flocculation affects the size, surface area, density and shape of fine-grained suspended solids in rivers which alters the transport properties of cohesive sediment. Factors controlling the shape of flocs include the source, size and geochemical characteristics of primary particles, varying degrees of chemical and biological coagulation in the water column as well as shear stress and turbulence levels in the stream. Floc shape can be quantified using fractal dimensions. This study examines spatial and temporal variability in fractal dimensions of suspended solids in two southern Ontario streams with contrasting riparian zones. Suspended solids were collected in triplicate at upstream and downstream sites in Strawberry Creek and Cedar Creek prior to snowmelt and during snowmelt. An image analysis system was used to determine area, longest axis and perimeter of particle populations. Fractal dimensions of the particle populations on each filter were calculated from the area-perimeter relationship (D) and the longest axis-area relationship (D2). Temporal and spatial changes in the fractal dimensions were explained by the differences in land use and temporal changes in the contributions of various sediment sources. Implications of the study for modeling floc transport are discussed.
Bibliography of Canadian Geomorphology