In‐channel surficial fine‐grained sediment laminae. Part I: Physical characteristics and formational processes
- 1 March 1994
- journal article
- research article
- Published by Wiley in Hydrological Processes
- Vol. 8 (2), 101-111
- https://doi.org/10.1002/hyp.3360080202
Abstract
An in-channel surficial depositional feature (surficial fine-grained laminae) composed of loosely bound fine sediment deposited during low flow conditions has often been observed in river systems in south-western Ontario. The physical characteristics of this feature have been determined by a direct observation image analysis system. This sediment consists primarily of flocculated fine-grained material. The size distributions of surficial fine-grained laminae and suspended sediment were not significantly different. Each distribution is bimodal in nature and shows a characteristic grain size deficiency in the 4-5 μm size range. This observation suggests that flocculation and not low discharge or low competence is the dominant mechanism for the formation of surficial fine-grained laminae under conditions of low flow in fluvial systems of south-western Ontario. A quantitative assessment of this feature shows its potential importance as a source of fine-grained sediment and associated contaminants for downstream transport.Keywords
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