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'])

15:02:09 INFO    opendrift.models.basemodel:519: OpenDriftSimulation initialised (version 1.11.10 / v1.11.10-15-g65004d9)

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))

15:02:09 INFO    opendrift.models.basemodel.environment:218: Adding a dynamical landmask with max. priority based on assumed maximum speed of 2.0 m/s. Adding a customised landmask may be faster...
15:02:15 INFO    opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
15:02:15 INFO    opendrift.models.basemodel.environment:248:    x_sea_water_velocity: 0.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    y_sea_water_velocity: 0.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    sea_surface_height: 0.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    upward_sea_water_velocity: 0.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    x_wind: 0.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    y_wind: 0.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_stokes_drift_x_velocity: 0.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_stokes_drift_y_velocity: 0.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    ocean_vertical_diffusivity: 0.020000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    ocean_mixed_layer_thickness: 50.000000
15:02:15 INFO    opendrift.models.basemodel.environment:248:    sea_floor_depth_below_sea_level: 10000.000000
15:02:15 INFO    opendrift.models.basemodel:940: Using existing reader for land_binary_mask
15:02:15 INFO    opendrift.models.basemodel:951: All points are in ocean
15:02:15 INFO    opendrift.models.basemodel:2042: 2024-07-01 15:02:09.318629 - step 1 of 216 - 35 active elements (0 deactivated)
15:02:16 INFO    opendrift.readers.reader_netCDF_CF_generic:102: Opening dataset: https://thredds.met.no/thredds/dodsC/sea/norkyst800m/1h/aggregate_be
/opt/conda/envs/opendrift/lib/python3.11/site-packages/pyproj/crs/crs.py:1286: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordinate-reference-systems
  proj = self._crs.to_proj4(version=version)
15:02:17 INFO    opendrift.readers.reader_netCDF_CF_generic:314: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}
/root/project/opendrift/readers/interpolation/interpolators.py:17: RuntimeWarning: overflow encountered in cast
  data[mask] = np.finfo(np.float64).min
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15:06:00 INFO    opendrift.models.basemodel:2203: Removing 2500 unseeded elements from history array

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'])

15:07:55 INFO    opendrift.models.basemodel:4612: Saving animation to /root/project/docs/source/gallery/animations/example_sediments_0.gif...
15:13:06 INFO    opendrift.models.basemodel:3041: Time to make animation: 0:06:55.047440
../_images/example_sediments_0.gif

Total running time of the script: (11 minutes 4.233 seconds)

Gallery generated by Sphinx-Gallery