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An Improved Method for Size Distribution of Stream Bed Gravel
Author(s) -
Leopold Luna B.
Publication year - 1970
Publication title -
water resources research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.863
H-Index - 217
eISSN - 1944-7973
pISSN - 0043-1397
DOI - 10.1029/wr006i005p01357
Subject(s) - weighting , sampling (signal processing) , statistics , sample size determination , geology , sample (material) , surface (topology) , bar (unit) , distribution (mathematics) , soil science , mineralogy , mathematics , geometry , computer science , mathematical analysis , physics , acoustics , oceanography , filter (signal processing) , computer vision , thermodynamics
Random sampling of surface rocks on a gravel bar is biased toward larger sizes which, because of their area, are more likely to be picked up. Weighting can eliminate this bias. Data on average weight of a single rock are used to change numbers of rocks to weights, thus yielding size frequency data in general agreement with a sieved and weighed sample. The question of what to sample depends on the use to which the data are to be put, and is not treated in detail in this paper.