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More knowledge is needed about the physical processes that control the transport of fine sediment moving over an alluvial bed. This knowledge is needed to design a rational sampling program that assesses the transport and fate of toxic substances in the Nation's surface waters because toxic substances are commonly associated with fine sediment. This paper reviews some of the past research in areas that may contribute to an increased understanding of the processes involved. An alluvial bed can have a large capacity to store fine sediments that are extracted from the flow when instream concentrations are high, and it can gradually release fine sediment to the flow when the instream concentrations are low. Several types of storage mechanisms are available, depending on the relative size distribution of the suspended load and bed material, as well as the flow hydraulics. Alluvial flow tends to segregate the deposited material according to size and density. Some of the storage locations are temporary, but some can store the fine sediment for very long periods of time.

u.s. geological survey open file report/open-file report

U.S. Geological Survey toxic substances hydrology program, surface-water contamination; proceedings of the technical meeting, Denver, Colorado, February 2-4, 1987