1) The document discusses different methods for sampling river sediments including manual sampling, mechanical sampling using a Van Veen grab, and using a Helley-Smith sampler. 2) It presents the grain size distributions of sediments sampled manually versus mechanically and discusses the composition of sediments in motion. 3) The document also presents dimensionless parameters for rivers like particle Reynolds number and Shields parameter for describing sediment transport and includes a rheological-phase diagram showing different transport regimes as a function of Shields parameter and slope.

1. Figura 1

2. Figura 2
(a) Campionatore manuale (b) Benna Van Veen
(c) Helley-Smith

3. Granulometria fondo da campionamento manuale (sinistra) e meccanico (destra)
Composizione
sedimento in moto
tramite campionamento
con Helley-Smith

4. Dimensionless parameters specific for rivers like Adige and torrents
Particle Reynolds number (particle inertia/fluid viscosity ) 𝑅𝑒 = 𝑔
𝜌 𝑠−𝜌
𝜌
𝑑
𝑑
𝜈
Shields (dimensionless shear stress at the bed) 𝜃 = 𝑢∗
2/𝑔
𝜌 𝑠−𝜌
𝜌
𝑑
Slope

5. 10
-2
10
-1
10
0
10
1
10
2
0
1
2
3
4
5
6

[°]
Collisional
sediment
transport
with
turbulent
suspension
Ordinary
bedload
Debris flow
Collisional
sediment
transport
Rheological-phase diagram (Shields-pendenza)

6. 

7. from TUROWSKI, RICKENMANN and DADSON (Sedimentology, 2010)

8. Particle dimension

9. Adige River at Trento