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    Author(s): Fredrick B. Lotspeich; Fred H. Everest
    Date: 1981
    Source: Res. Note PNW-RN-369. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 11 p
    Publication Series: Research Note (RN)
    Station: Pacific Northwest Research Station
    PDF: View PDF  (269 KB)

    Description

    A new method has been developed for collecting, sorting, and interpreting gravel quality. Samples are collected with a tri-tube freeze-core device and dry-sorted by using sieves based on the Wentworth scale. An index to the quality of gravel is obtained by dividing geometric mean particle size by the sorting coefficient (a measure of the distribution of grain sizes) of a sample. The resulting number is called the "fredle index" and is proposed as a standard for evaluating the reproductive potential of spawning gravel.

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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

    Lotspeich, Fredrick B.; Everest, Fred H. 1981. A new method for reporting and interpreting textural composition of spawning gravel. Res. Note PNW-RN-369. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Forest and Range Experiment Station. 11 p

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    Keywords

    Spawning beds, gravels, sediment sampling, stream habitat management, indexes (spawning gravel), fish habitat

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