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Application of Two Automated Grain Sizing Approaches and Comparison with Traditional Methods

Author(s): G. Harb; J. Schneider

Linked Author(s): Josef Schneider

Keywords: Sediment transport; Automated Grain Sizing (AGS); Grain sizedistribution

Abstract: Traditional pebble count methods limit the spatial resolution of surface characterization by grain-size distribution. The Automated Grain Size (AGS) method is a technique for determining the grain-size distribution by means of digital photographs. This paper compares the two different software packages Image Tool3.0and Image J with traditional methods to evaluate their applicability in practical work. As a first step pictures of gravel bars with a wide range of sedimentary conditions and of standardized grains, which is usually used in physical hydraulic model tests were taken. Subsequently it was analyzed by dint of the software. Existing differences between the two software packages and traditional methods and the respective advantages and disadvantages could be identified. The findings of this comparison were highly satisfying. It could be shown that grain size distributions derived from the digital images were match able with the conventional distributions but performing the AGS method takes about one tenth of the time.

DOI:

Year: 2009

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