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Total sediment discharge sampling over sills
Author(s) -
Hansen Edward A.
Publication year - 1974
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/wr010i005p00989
Subject(s) - sill , cobble , sediment , bed load , hydrology (agriculture) , sampling (signal processing) , geology , streams , environmental science , geotechnical engineering , geomorphology , sediment transport , ecology , engineering , computer network , geochemistry , filter (signal processing) , habitat , computer science , electrical engineering , biology
Easily installed wooden sills permit collection of bed load sediment normally missed in the ‘unsampled zone.’ Sills also (1) provide a rigid unchanging control at which to sample, (2) reduce the chance of sample bias from sediment stirred up by the wader, and (3) permit control of the sampling interval because the sample points can be marked directly on the sill. Field data indicated that the ‘sill samples’ probably provided better measurements of total sediment discharge than traditional ‘stream samples’ do. Nonuniformity of bed load discharge in cross sections of the sampled streams complicated the problem of getting unbiased samples. Lateral nonuniformity of sand bed load discharges was greatest in coarse (gravel and cobble) bedded channels having small sand loads. Sampling modifications are proposed to compensate for this nonuniformity.