Developed by T. Endreny at SUNY ESF in the Department of Environmental Resources Engineering
Fluvial Geomorphology
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Explanation of Dominant Bed Material Exercise

pebble

Exercise Objective

To assess the Rosgen Level II pebble count measurements for the single threaded Ouachita River Reach.

Exercise Explanation

  1. Pebble intermediate axis, diameter, and class data are shown below:
    • Pebble 1 = y, 10.1 mm, gravel
    • Pebble 2 = x, 16.8 mm, gravel
    • Pebble 3 = z, 0.60 mm, sand
    • Pebble 4 = y, 3.5 mm, gravel
    • Pebble 5 = x, 74 mm, cobble
    • Pebble 6 = y, 6.00 mm, gravel
    • Pebble 7 = z, 0.065 mm, sand
    • Pebble 8 = x, 1.37 mm, sand
    • Pebble 9 = y, 0.67 mm, sand
    • Pebble 10 = y, 17.8 mm, gravel
  2. Predominant bed material is gravel with 5 counts, as revealed in the histogram image on this page.

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