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S. Karalis, A. Aytousmis, A. Iordanou, G. Karakostas, K. Charatsis, E. Karymbalis
S. Karalis, A. Aytousmis, A. Iordanou, G. Karakostas, K. Charatsis, E. Karymbalis


The grain size distribution (GSD) of surface bed material in alluvial rivers is of interest in many geological, ecological and engineering applications. In this work, which is a part of our broader Ph.D research in Vouraikos river on sediment transport, we are testing the possibility of obtaining such a distribution from photographs taken at the field (grid sampling), compared with the standard method which is the “pebble count”. We have also examined and quantified the errors resulting from radial distortion of the photographs. The motive of the work was to explore the opportunity of substituting field work for laboratory work. Results show that for this method to give reliable results, a better knowledge of the site-specific conditions is needed, which, in turn, requires more field work.


pebble count; bed material; photogrammetry; photography; sediment transport

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Adams, J., 1979. Gravel size analysis from photographs, Journal of the Hydraulics Division, ASC

E, 105(HY10): 1247-1255.












10 100 1000

percent finer

Grain size mm

pebble count

grid count corrected

Bornovas, I. and Rondoyanni, Th., 1983. Geological Map of Greece, Scale 1:500,000, Institute of

Geology and Mineral Exploration, Athens.

Bunte, K. and Abt, S., 2001. Sampling Surface and Subsurface Particle-Size Distributions in

Wadable Gravel- and Cobble-Bed Streams for Analyses in Sediment Transport, Hydraulics,

and Streambed Monitoring, Rocky Mountain Research Station, USDA, Forest Service,

General Technical Report RMRS-GTR-74.

Church, M., McLean, D.G. and Walcott, J.F., 1987. River bed gravels: sampling and analysis. In: S

ediment Transport in Gravel-Bed Rivers, Thorne, C.R., Bathurst, J.C. and Hey, R.D., eds., J

ohn Wiley and Sons, Chichester, 43-88.

Douskos, V., Kalisperakis, I., Karras, G. and Petsa, E., 2008. Fully automatic camera calibration

using regular planar patterns, International Archives of the Photogrammetry, Remote Sensing

and Spatial Information Sciences, XXXVII/B5, 21-26.

Katsafados, P., Kalogirou, S., Papadopoulos, A. and Korres, G., 2012. Mapping Long-Term Atmos

pheric Variables over Greece, Journal of Maps, 8, 181-184.

Kellerhals, R. and Bray, D.I., 1971. Sampling procedures for coarse fluvial sediments, Journal of t

he Hydraulics Division, ASCE, 97(HY8), 1165-1180.

Parker, G., 2004. 1D Sediment Transport Morphodynamics with applications to Rivers and turbidity

currents, e-book.

Wentworth, C., 1922. A Scale of Grade and Class Terms for Clastic Sediments, The Journal of

Geology, 30(5), 377-392.


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