Some Benefits of Grid by Number Sampling

by 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.

Subject Headings: Sediment | Grid systems | River and stream beds | Rivers and streams | Spatial analysis | Gravels | Statistics

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