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Bar resistance in gravel bed streams at bankfull stage
Author(s) -
Prestegaard Karen L.
Publication year - 1983
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/wr019i002p00472
Subject(s) - bar (unit) , stage (stratigraphy) , streams , geology , geotechnical engineering , flow resistance , surface finish , flow (mathematics) , hydrology (agriculture) , materials science , geometry , mathematics , composite material , computer network , paleontology , oceanography , computer science
Total flow resistance in gravel bed streams with high width/depth ratios and low sinuosities is primarily a result of grain and bar roughnesses. The relative importance of these two roughness elements has not been established. The relative importance of grain and bar resistance is examined for 12 straight and divided gravel bed reaches at bankfull stage by using the Keulegan equation to determine a resistance division of energy slope. The remaining slope is assumed to represent the relative importance of bar resistance. Bar resistance accounts for 50 to 75% of the total resistance in these reaches. Calculated values of reach‐averaged bar slope correlate closely with field measurements of bar magnitude.