Note
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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'])
07:27:43 INFO opendrift:513: OpenDriftSimulation initialised (version 1.14.2 / v1.14.2-90-g1dd1995)
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))
07:27:43 INFO opendrift.models.basemodel.environment:206: Adding a global landmask from GSHHG
07:27:47 INFO opendrift.models.basemodel.environment:229: Fallback values will be used for the following variables which have no readers:
07:27:47 INFO opendrift.models.basemodel.environment:232: x_sea_water_velocity: 0.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: y_sea_water_velocity: 0.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: sea_surface_height: 0.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: upward_sea_water_velocity: 0.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: x_wind: 0.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: y_wind: 0.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_stokes_drift_x_velocity: 0.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_stokes_drift_y_velocity: 0.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: ocean_vertical_diffusivity: 0.020000
07:27:47 INFO opendrift.models.basemodel.environment:232: ocean_mixed_layer_thickness: 50.000000
07:27:47 INFO opendrift.models.basemodel.environment:232: sea_floor_depth_below_sea_level: 10000.000000
07:27:47 INFO opendrift:1743: Storing previous values of element property lon because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
07:27:47 INFO opendrift:1743: Storing previous values of element property lat because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
07:27:47 INFO opendrift:899: Using existing reader for land_binary_mask
07:27:47 INFO opendrift:928: All points are in ocean
07:27:47 INFO opendrift:2035: 2025-07-17 07:27:43.798407 - step 1 of 216 - 35 active elements (0 deactivated)
07:27:47 INFO opendrift.readers:61: Opening file with xr.open_dataset
07:27:49 INFO opendrift.readers.reader_netCDF_CF_generic:332: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}
07:27:51 INFO opendrift:2035: 2025-07-17 07:37:43.798407 - step 2 of 216 - 70 active elements (0 deactivated)
07:27:51 INFO opendrift:2035: 2025-07-17 07:47:43.798407 - step 3 of 216 - 105 active elements (0 deactivated)
07:27:52 INFO opendrift:2035: 2025-07-17 07:57:43.798407 - step 4 of 216 - 139 active elements (0 deactivated)
07:27:52 INFO opendrift:2035: 2025-07-17 08:07:43.798407 - step 5 of 216 - 174 active elements (0 deactivated)
07:27:53 INFO opendrift:2035: 2025-07-17 08:17:43.798407 - step 6 of 216 - 209 active elements (0 deactivated)
07:27:53 INFO opendrift:2035: 2025-07-17 08:27:43.798407 - step 7 of 216 - 244 active elements (0 deactivated)
07:27:53 INFO opendrift:2035: 2025-07-17 08:37:43.798407 - step 8 of 216 - 278 active elements (0 deactivated)
07:27:53 INFO opendrift:2035: 2025-07-17 08:47:43.798407 - step 9 of 216 - 313 active elements (0 deactivated)
07:27:53 INFO opendrift:2035: 2025-07-17 08:57:43.798407 - step 10 of 216 - 348 active elements (0 deactivated)
07:27:53 INFO opendrift:2035: 2025-07-17 09:07:43.798407 - step 11 of 216 - 382 active elements (0 deactivated)
07:27:54 INFO opendrift:2035: 2025-07-17 09:17:43.798407 - step 12 of 216 - 417 active elements (0 deactivated)
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07:27:55 INFO opendrift:2035: 2025-07-17 09:47:43.798407 - step 15 of 216 - 521 active elements (0 deactivated)
07:27:55 INFO opendrift:2035: 2025-07-17 09:57:43.798407 - step 16 of 216 - 556 active elements (0 deactivated)
07:27:55 INFO opendrift:2035: 2025-07-17 10:07:43.798407 - step 17 of 216 - 591 active elements (0 deactivated)
07:27:56 INFO opendrift:2035: 2025-07-17 10:17:43.798407 - step 18 of 216 - 625 active elements (0 deactivated)
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07:27:56 INFO opendrift:2035: 2025-07-17 10:37:43.798407 - step 20 of 216 - 695 active elements (0 deactivated)
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07:28:49 INFO opendrift:2035: 2025-07-18 19:17:43.798407 - step 216 of 216 - 7500 active elements (0 deactivated)
07:28:49 INFO opendrift:2142: 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'])
07:29:02 INFO opendrift:4553: Saving animation to /root/project/docs/source/gallery/animations/example_sediments_0.gif...
07:29:54 INFO opendrift:2994: Time to make animation: 0:01:00.806551

Total running time of the script: (2 minutes 15.848 seconds)