Note
Go to the end to download the full example code.
Sediment drift from Glomma river outlet
from datetime import timedelta, datetime
from opendrift.models.sedimentdrift import SedimentDrift
o = SedimentDrift(loglevel=20) # 0 for debug output
if False: # Using constant south-westwards current and wind
o.set_config('environment:fallback:x_sea_water_velocity', -.05)
o.set_config('environment:fallback:y_sea_water_velocity', -.1)
o.set_config('environment:fallback:y_wind', -6)
o.set_config('environment:fallback:x_wind', -2)
o.set_config('environment:fallback:sea_floor_depth_below_sea_level', 100) # 100m depth
else: # Using live data from Thredds
o.add_readers_from_list([
'https://thredds.met.no/thredds/dodsC/sea/norkyst800m/1h/aggregate_be'])
15:33:20 INFO opendrift:509: OpenDriftSimulation initialised (version 1.14.0 / v1.14.0-6-gaedbab0)
Adding some diffusion
o.set_config('drift:current_uncertainty', .2)
o.set_config('drift:wind_uncertainty', 2)
o.set_config('vertical_mixing:diffusivitymodel', 'windspeed_Large1994')
#o.set_config('vertical_mixing:diffusivitymodel', 'environment')
Source of sediments at Glomma river outlet
lat=59.169194
lon=10.962920
o.seed_elements(lon=lon, lat=lat, number=10000,
time=[datetime.utcnow(), datetime.utcnow()+timedelta(hours=48)],
terminal_velocity=-.001) # 1 mm/s settling speed
o.run(time_step=600, time_step_output=1800, duration=timedelta(hours=36))
/root/project/examples/example_sediments.py:34: DeprecationWarning: datetime.datetime.utcnow() is deprecated and scheduled for removal in a future version. Use timezone-aware objects to represent datetimes in UTC: datetime.datetime.now(datetime.UTC).
time=[datetime.utcnow(), datetime.utcnow()+timedelta(hours=48)],
15:33:20 INFO opendrift.models.basemodel.environment:206: Adding a global landmask from GSHHG
15:33:24 INFO opendrift.models.basemodel.environment:229: Fallback values will be used for the following variables which have no readers:
15:33:24 INFO opendrift.models.basemodel.environment:232: x_sea_water_velocity: 0.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: y_sea_water_velocity: 0.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: sea_surface_height: 0.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: upward_sea_water_velocity: 0.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: x_wind: 0.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: y_wind: 0.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_stokes_drift_x_velocity: 0.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_stokes_drift_y_velocity: 0.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: ocean_vertical_diffusivity: 0.020000
15:33:24 INFO opendrift.models.basemodel.environment:232: ocean_mixed_layer_thickness: 50.000000
15:33:24 INFO opendrift.models.basemodel.environment:232: sea_floor_depth_below_sea_level: 10000.000000
15:33:24 INFO opendrift:907: Using existing reader for land_binary_mask
15:33:24 INFO opendrift:936: All points are in ocean
15:33:24 INFO opendrift:2102: 2025-05-16 15:33:20.094165 - step 1 of 216 - 35 active elements (0 deactivated)
15:33:24 INFO opendrift.readers:61: Opening file with xr.open_dataset
15:33:26 INFO opendrift.readers.reader_netCDF_CF_generic:332: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}
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15:37:37 INFO opendrift:2234: Removing 2500 unseeded elements
Plotting the depth vs time
o.plot_property('z')

Animate sediment particles colored by their depth
o.animation(color='z', fast=False, buffer=.01)
#o.animation(color='moving', fast=False, buffer=.01, colorbar=False, legend=['Sedimented', 'Moving'])
15:37:52 INFO opendrift:4650: Saving animation to /root/project/docs/source/gallery/animations/example_sediments_0.gif...
15:39:05 INFO opendrift:3086: Time to make animation: 0:01:22.769302

Total running time of the script: (5 minutes 50.352 seconds)