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- W102538566 abstract "Research was conducted during summer low flow on two third-order mountain streams in northwest Washington. The study assesses the downstream distribution of the largest particles with respect to stream-channel morphology, source-area lithology and rock durability, and debris flow history. Downstream fining was examined on the basis of the trend in the largest clast sizes. A systematic sampling program was applied at average intervals of 16 times the active channel width. Equivalent sampling sites were identified as the coarsest surface of the active channel bar nearest the scaled interval. 78 samples of stream-bed particles were measured at 49 sites along a 22 km reach of Finney Creek. 39 samples were measured at 19 sites along a 8 km reach of Presenting Creek. Preliminary analysis of mean particles sizes reveals systematic declines over distances up to 2.1 km. Some of the fining trends can best be characterized by a power function (r[sup 2] [approximately] 0.880). The data shows only a weakly correlated exponential or linear functions (r[sup 2] [approximately] 0.880). The data shows only a weakly correlated exponential decline of the mean particle size over the entire reach for each stream. Based on preliminary analysis of the data, the presence or absencemore » of downstream fining trends appears to be most strongly related to proximity to debris flow source and time since the last debris flow. Other factors that demonstrably affect particle fining include morphometric variables of the stream, and nature of the clasts.« less" @default.
- W102538566 created "2016-06-24" @default.
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- W102538566 date "1993-04-01" @default.
- W102538566 modified "2023-09-27" @default.
- W102538566 title "Downstream fining of particles in mountain streams of the Pacific northwest" @default.
- W102538566 hasPublicationYear "1993" @default.
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