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'])
10:48:28 INFO opendrift:509: OpenDriftSimulation initialised (version 1.13.1 / v1.13.1-25-g5021161)
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))
10:48:28 INFO opendrift.models.basemodel.environment:206: Adding a global landmask from GSHHG
10:48:33 INFO opendrift.models.basemodel.environment:229: Fallback values will be used for the following variables which have no readers:
10:48:33 INFO opendrift.models.basemodel.environment:232: x_sea_water_velocity: 0.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: y_sea_water_velocity: 0.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: sea_surface_height: 0.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: upward_sea_water_velocity: 0.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: x_wind: 0.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: y_wind: 0.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_stokes_drift_x_velocity: 0.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_stokes_drift_y_velocity: 0.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: ocean_vertical_diffusivity: 0.020000
10:48:33 INFO opendrift.models.basemodel.environment:232: ocean_mixed_layer_thickness: 50.000000
10:48:33 INFO opendrift.models.basemodel.environment:232: sea_floor_depth_below_sea_level: 10000.000000
10:48:33 INFO opendrift:923: Using existing reader for land_binary_mask
10:48:33 INFO opendrift:934: All points are in ocean
10:48:33 INFO opendrift:2060: 2025-04-22 10:48:28.233923 - step 1 of 216 - 35 active elements (0 deactivated)
10:48:33 INFO opendrift.readers:61: Opening file with xr.open_dataset
10:48:35 INFO opendrift.readers.reader_netCDF_CF_generic:332: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}
10:48:39 INFO opendrift:2060: 2025-04-22 10:58:28.233923 - step 2 of 216 - 70 active elements (0 deactivated)
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10:48:48 INFO opendrift:2060: 2025-04-22 12:08:28.233923 - step 9 of 216 - 313 active elements (0 deactivated)
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10:52:39 INFO opendrift:2060: 2025-04-23 22:38:28.233923 - step 216 of 216 - 7500 active elements (0 deactivated)
10:52:39 INFO opendrift:2192: 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'])
10:52:58 INFO opendrift:4607: Saving animation to /root/project/docs/source/gallery/animations/example_sediments_0.gif...
10:53:45 INFO opendrift:3043: Time to make animation: 0:00:59.371644

Total running time of the script: (5 minutes 23.265 seconds)