Abstract
This study examines the distribution and composition of fine sediment within the gravel‐bed substrate of the channelized River Tame, within and below the Birmingham conurbation, United Kingdom. A freeze coring technique was employed to collect undistributed volumetric samples, to a depth of 30‐40 cm, providing information not only on the gross deposit but also on the vertical structure of the river bed in terms of textural and geochemical properties.The urbanized substrate differs from that of the natural river, both in terms of the volume of matrix sediment present, which is less than ‚expected’︁, and in the size characteristics of the coarse framework and finer matrix components. Moreover heavy metal concentrations within the urbanized matrix sediment are up to 3000 times greater than background levels and maximum concentrations are shown to occur at a depth of more than 15 cm within the substrate.

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