environmentaltools.processes.settling_velocity

environmentaltools.processes.settling_velocity(ds, info, type_='Rubey')[source]

Calculate sediment particle settling velocity in water.

Computes the terminal fall velocity of sediment particles using empirical formulas that account for particle size, shape, and fluid properties.

Parameters:

ds (float or np.ndarray) – Sediment grain diameter (m)
info (dict) –
Dictionary with fluid and sediment properties:
- nufloat
  Kinematic viscosity of water (m²/s)
- sgfloat
  Specific gravity of sediment (dimensionless, typically 2.65 for quartz)
- Spfloat
  Sediment shape factor (required for Wu_Wang method)
type (str, optional) – Settling velocity formula: ‘Rubey’ or ‘Wu_Wang’. Default: ‘Rubey’

Returns:

Settling velocity (m/s)

Return type:

float or np.ndarray

Raises:

ValueError – If settling velocity formula is not implemented

Notes

Available formulas: