1. Sediment in streams

2. Particle size measurement
Coarse fraction (>2mm)
Wolman pebble counts
Digital image processing
Sieving (>0.063mm)
Fine fraction (<2mm)
Sieving
Settling
Hydrometer
Laser diffraction

3. Particle Size Distributions
Usually constructed by weight fractions retained in different sieves OR in different diameter intervals assuming density invariance.
KEY DIAMETER BENCHMARKS
D50 – median
D84 and D95 – representative coarse fractions

4. PSD sorting
Here expressed in terms of standard deviation of phi values.
Note: sorting is the opposite of grading!

5. Sample data
Sometimes particle-size axis is flipped

6. The go-to resource

7. Types of alluvial stream channels (Montgomery-Buffington, 1997 & 1998)
Cascade
Step-pool
Plane-bed
Pool-riffle
Dune-ripple

8. Schumm classification

9. Rosgen’s classification system

10. Channel Evolution models
Schumm, Hupp, Simon, etc

11. Channel-forming discharge
Biedenham, et al., 2000