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    Author(s): Thomas E. Lisle; Rand E. Eads
    Date: 1991
    Source: Research Note PSW-411, Berkeley, California: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. 7 p.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (139 KB)

    Description

    Sediment transport occurring after spawning can cause scour of incubating embryos and infiltration of fine sediment into spawning gravel, decreasing intergravel flow and preventing hatched fry from emerging from the gravel. Documentation of these effects requires measuring gravel conditions before and after high flow periods and combining methods to record scour and fill and sediment infiltration by different grain sizes at different depths in the streambed. Scour and fill is best measured with scour chains, which can record the depth of maximum scour that occurs during high flow. Repetitive sampling of bed material with bulk-core or freeze-core samples can be hindered by the large size of sample required to adequately characterize gravel mixtures compared to the size of fish redds.

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Lisle, Thomas E.; Eads, Rand E. 1991. Methods to measure sedimentation of spawning gravels. Research Note PSW-411, Berkeley, California: Pacific Southwest Research Station, Forest Service, U.S. Department of Agriculture. 7 p.

    Keywords

    PSW4351, spawning gravel, fine sediment, channel scour, methods

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