Some Benefits of Grid by Number Samplingby David Crowder, Polytechnic Inst and State Univ, Blacksburg, United States,
Panayiotis Diplas, (M.ASCE), Polytechnic Inst and State Univ, Blacksburg, United States,
Document Type: Proceeding Paper
Part of: Hydraulic Engineering
Describing the overall sediment composition of gravel-bed river reaches and depositional bars is a difficult problem due to spatial variations in the sediment size. Past research has focused largely on obtaining an unbiased, volumetrically equivalent sample at a single point, however, little research has been done on examining spatial variability. The statistical characteristics of grid samples and a comparison between grid and bulk sample sizes are given here. The possibility of extending grid by number sampling to describe spatially heterogenous materials will be briefly outlined as well.
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