Note
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2D simulation profile
from datetime import datetime, timedelta
import numpy as np
from opendrift.models.oceandrift import OceanDrift
o = OceanDrift(loglevel=20) # Set loglevel to 0 for debug information
14:19:54 INFO opendrift:509: OpenDriftSimulation initialised (version 1.13.0 / v1.13.0-75-gd4c13d2)
Define some constant current, wind and Stokes drift
o.set_config('environment:fallback:x_wind', 7)
o.set_config('environment:fallback:x_sea_water_velocity', .1)
o.set_config('environment:fallback:sea_surface_wave_stokes_drift_x_velocity', .2)
o.set_config('environment:fallback:sea_surface_wave_significant_height', 2)
o.set_config('environment:fallback:sea_surface_wave_period_at_variance_spectral_density_maximum', 8)
Seed elements between surface and 5m depth
time = datetime.utcnow()
z = -np.linspace(0, 5, 50)
o.seed_elements(lon=4.5, lat=60.0, z=z, radius=0, number=len(z), time=time)
14:19:54 INFO opendrift.models.basemodel.environment:206: Adding a dynamical landmask with max. priority based on assumed maximum speed of 2.0 m/s. Adding a customised landmask may be faster...
14:19:59 INFO opendrift.models.basemodel.environment:233: Fallback values will be used for the following variables which have no readers:
14:19:59 INFO opendrift.models.basemodel.environment:236: x_sea_water_velocity: 0.100000
14:19:59 INFO opendrift.models.basemodel.environment:236: y_sea_water_velocity: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_height: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: x_wind: 7.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: y_wind: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: upward_sea_water_velocity: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: ocean_vertical_diffusivity: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_wave_significant_height: 2.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_wave_stokes_drift_x_velocity: 0.200000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_wave_stokes_drift_y_velocity: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_wave_period_at_variance_spectral_density_maximum: 8.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_swell_wave_to_direction: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_swell_wave_significant_height: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_wind_wave_to_direction: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_wind_wave_mean_period: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_surface_wind_wave_significant_height: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: surface_downward_x_stress: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: surface_downward_y_stress: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: turbulent_kinetic_energy: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: turbulent_generic_length_scale: 0.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: ocean_mixed_layer_thickness: 50.000000
14:19:59 INFO opendrift.models.basemodel.environment:236: sea_floor_depth_below_sea_level: 10000.000000
Running model for 6 hours
o.run(duration=timedelta(hours=6), time_step=600)
14:19:59 INFO opendrift:919: Using existing reader for land_binary_mask
14:19:59 INFO opendrift:930: All points are in ocean
14:19:59 INFO opendrift:2056: 2025-03-13 14:19:54.555216 - step 1 of 36 - 50 active elements (0 deactivated)
14:19:59 INFO opendrift:2056: 2025-03-13 14:29:54.555216 - step 2 of 36 - 50 active elements (0 deactivated)
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To check that z is really kept constant for all particles
o.plot_property('z')

Vertical profile of advection. Note the decaying importance of Stokes drift, and the additional windage of the element at surface
o.animation_profile()
14:20:00 INFO opendrift:4600: Saving animation to /root/project/docs/source/gallery/animations/example_2d_0.gif...
14:20:04 INFO opendrift:3246: Time to make animation: 0:00:04.121574

Total running time of the script: (0 minutes 16.582 seconds)