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/fou-hi/norkystv3_800m_m00_be'])

13:50:28 INFO    opendrift:576: OpenDriftSimulation initialised (version 1.14.7 / v1.14.7-15-g2988cd4)

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.now(), datetime.now()+timedelta(hours=48)],
                terminal_velocity=-.001)  # 1 mm/s settling speed

o.run(time_step=600, time_step_output=1800, duration=timedelta(hours=36))

13:50:28 INFO    opendrift.models.basemodel.environment:203: Adding a global landmask from GSHHG
13:50:33 INFO    opendrift.models.basemodel.environment:227: Fallback values will be used for the following variables which have no readers:
13:50:33 INFO    opendrift.models.basemodel.environment:230:    x_sea_water_velocity: 0.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    y_sea_water_velocity: 0.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    sea_surface_height: 0.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    upward_sea_water_velocity: 0.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    x_wind: 0.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    y_wind: 0.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    sea_surface_wave_stokes_drift_x_velocity: 0.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    sea_surface_wave_stokes_drift_y_velocity: 0.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    ocean_vertical_diffusivity: 0.020000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    ocean_mixed_layer_thickness: 50.000000
13:50:33 INFO    opendrift.models.basemodel.environment:230:    sea_floor_depth_below_sea_level: 10000.000000
13:50:33 INFO    opendrift:1814: Storing previous values of element property lon because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
13:50:33 INFO    opendrift:1814: Storing previous values of element property lat because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
13:50:33 INFO    opendrift:952: Using existing reader for land_binary_mask to move elements to ocean
13:50:33 INFO    opendrift:982: All points are in ocean
13:50:33 INFO    opendrift:2111: 2025-12-16 13:50:28.663561 - step 1 of 216 - 35 active elements (0 deactivated)
13:50:33 INFO    opendrift.readers:63: Opening file with xr.open_dataset
13:50:35 INFO    opendrift.readers.reader_netCDF_CF_generic:332: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}
13:50:35 INFO    opendrift.readers.basereader:176: Variable x_sea_water_velocity will be rotated from eastward_sea_water_velocity
13:50:35 INFO    opendrift.readers.basereader:176: Variable y_sea_water_velocity will be rotated from northward_sea_water_velocity
13:50:35 INFO    opendrift.readers.basereader:176: Variable x_wind will be rotated from eastward_wind
13:50:35 INFO    opendrift.readers.basereader:176: Variable y_wind will be rotated from northward_wind
13:50:39 INFO    opendrift:2111: 2025-12-16 14:00:28.663561 - step 2 of 216 - 70 active elements (0 deactivated)
13:50:40 INFO    opendrift:2111: 2025-12-16 14:10:28.663561 - step 3 of 216 - 105 active elements (0 deactivated)
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13:52:51 INFO    opendrift:2220: Removing 2500 unseeded elements

<xarray.Dataset> Size: 55MB
Dimensions:                                                                              (
                                                                                          trajectory: 7500,
                                                                                          time: 73)
Coordinates:
  * trajectory                                                                           (trajectory) int64 60kB ...
  * time                                                                                 (time) datetime64[ns] 584B ...
Data variables: (12/25)
    status                                                                               (trajectory, time) float32 2MB ...
    moving                                                                               (trajectory, time) float32 2MB ...
    age_seconds                                                                          (trajectory, time) float32 2MB ...
    origin_marker                                                                        (trajectory, time) float32 2MB ...
    lon                                                                                  (trajectory, time) float32 2MB ...
    lat                                                                                  (trajectory, time) float32 2MB ...
    ...                                                                                   ...
    sea_surface_wave_period_at_variance_spectral_density_maximum                         (trajectory, time) float32 2MB ...
    sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment  (trajectory, time) float32 2MB ...
    land_binary_mask                                                                     (trajectory, time) float32 2MB ...
    ocean_vertical_diffusivity                                                           (trajectory, time) float32 2MB ...
    ocean_mixed_layer_thickness                                                          (trajectory, time) float32 2MB ...
    sea_floor_depth_below_sea_level                                                      (trajectory, time) float32 2MB ...
Attributes: (12/126)
    Conventions:                                                             ...
    standard_name_vocabulary:                                                ...
    featureType:                                                             ...
    title:                                                                   ...
    summary:                                                                 ...
    keywords:                                                                ...
    ...                                                                                                               ...
    geospatial_lon_units:                                                    ...
    geospatial_lon_resolution:                                               ...
    runtime:                                                                 ...
    geospatial_vertical_min:                                                 ...
    geospatial_vertical_max:                                                 ...
    geospatial_vertical_positive:                                            ...


Plotting the depth vs time

o.plot_property('z')
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'])

13:53:05 INFO    opendrift:4660: Saving animation to /root/project/docs/source/gallery/animations/example_sediments_0.gif...
13:54:08 INFO    opendrift:3094: Time to make animation: 0:01:12.797912
../_images/example_sediments_0.gif

Total running time of the script: (3 minutes 45.487 seconds)

Gallery generated by Sphinx-Gallery