Note
Go to the end to download the full example code.
Relative and absolute wind
from datetime import timedelta
from opendrift.readers import reader_netCDF_CF_generic
from opendrift.models.oceandrift import OceanDrift
o = OceanDrift(loglevel=20) # Set loglevel to 0 for debug information
# Arome
reader_arome = reader_netCDF_CF_generic.Reader(o.test_data_folder() +
'16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc')
#reader_arome = reader_netCDF_CF_generic.Reader('https://thredds.met.no/thredds/dodsC/mepslatest/meps_lagged_6_h_latest_2_5km_latest.nc')
# Norkyst
reader_norkyst = reader_netCDF_CF_generic.Reader(o.test_data_folder() +
'16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc')
#reader_norkyst = reader_netCDF_CF_generic.Reader('https://thredds.met.no/thredds/dodsC/sea/norkyst800m/1h/aggregate_be')
o.add_reader([reader_norkyst, reader_arome])
20:12:39 INFO opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)
20:12:39 INFO opendrift.readers:58: Opening file with xr.open_dataset
20:12:39 INFO opendrift.readers.reader_netCDF_CF_generic:337: Detected dimensions: {'time': 'time', 'x': 'x', 'y': 'y'}
20:12:39 INFO opendrift.readers:58: Opening file with xr.open_dataset
20:12:39 INFO opendrift.readers.reader_netCDF_CF_generic:337: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}
Seeding some particles
lon = 4.2; lat = 60.0; # Outside Bergen
time = [reader_arome.start_time,
reader_arome.start_time + timedelta(hours=30)]
Using windspeed relative to moving ocean (current)
o.set_config('drift:relative_wind', False)
o.set_config('drift:vertical_mixing', False)
Seed oil elements at defined position and time
o.seed_elements(lon, lat, radius=50, number=5000, time=time)
o.run(steps=48*2, time_step=1800, time_step_output=3600*2)
20:12:39 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...
20:12:42 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_height: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: upward_sea_water_velocity: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_to_direction: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_significant_height: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_to_direction: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_mean_period: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_significant_height: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: surface_downward_x_stress: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: surface_downward_y_stress: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: turbulent_kinetic_energy: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: turbulent_generic_length_scale: 0.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
20:12:42 INFO opendrift.models.basemodel.environment:248: sea_floor_depth_below_sea_level: 10000.000000
20:12:42 INFO opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:12:42 INFO opendrift.models.basemodel:946: All points are in ocean
20:12:42 INFO opendrift.models.basemodel:2035: 2015-11-16 00:00:00 - step 1 of 96 - 84 active elements (0 deactivated)
20:12:42 INFO opendrift.models.basemodel:2035: 2015-11-16 00:30:00 - step 2 of 96 - 167 active elements (0 deactivated)
20:12:42 INFO opendrift.models.basemodel:2035: 2015-11-16 01:00:00 - step 3 of 96 - 250 active elements (0 deactivated)
20:12:42 INFO opendrift.models.basemodel:2035: 2015-11-16 01:30:00 - step 4 of 96 - 334 active elements (0 deactivated)
20:12:42 INFO opendrift.models.basemodel:2035: 2015-11-16 02:00:00 - step 5 of 96 - 417 active elements (0 deactivated)
20:12:42 INFO opendrift.models.basemodel:2035: 2015-11-16 02:30:00 - step 6 of 96 - 500 active elements (0 deactivated)
20:12:43 INFO opendrift.models.basemodel:2035: 2015-11-16 03:00:00 - step 7 of 96 - 584 active elements (0 deactivated)
20:12:43 INFO opendrift.models.basemodel:2035: 2015-11-16 03:30:00 - step 8 of 96 - 667 active elements (0 deactivated)
20:12:43 INFO opendrift.models.basemodel:2035: 2015-11-16 04:00:00 - step 9 of 96 - 750 active elements (0 deactivated)
20:12:43 INFO opendrift.models.basemodel:2035: 2015-11-16 04:30:00 - step 10 of 96 - 834 active elements (0 deactivated)
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20:12:43 INFO opendrift.models.basemodel:2035: 2015-11-16 05:30:00 - step 12 of 96 - 1000 active elements (0 deactivated)
20:12:43 INFO opendrift.models.basemodel:2035: 2015-11-16 06:00:00 - step 13 of 96 - 1084 active elements (0 deactivated)
20:12:43 INFO opendrift.models.basemodel:2035: 2015-11-16 06:30:00 - step 14 of 96 - 1167 active elements (0 deactivated)
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20:12:43 INFO opendrift.models.basemodel:2035: 2015-11-16 07:30:00 - step 16 of 96 - 1334 active elements (0 deactivated)
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20:12:43 INFO opendrift.models.basemodel:2035: 2015-11-16 11:00:00 - step 23 of 96 - 1917 active elements (0 deactivated)
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20:12:44 INFO opendrift.models.basemodel:2035: 2015-11-17 00:00:00 - step 49 of 96 - 4083 active elements (0 deactivated)
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20:12:49 INFO opendrift.models.basemodel:2035: 2015-11-17 16:00:00 - step 81 of 96 - 4968 active elements (32 deactivated)
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20:12:50 INFO opendrift.models.basemodel:2035: 2015-11-17 22:30:00 - step 94 of 96 - 4753 active elements (247 deactivated)
20:12:50 INFO opendrift.models.basemodel:2035: 2015-11-17 23:00:00 - step 95 of 96 - 4753 active elements (247 deactivated)
20:12:50 INFO opendrift.models.basemodel:2035: 2015-11-17 23:30:00 - step 96 of 96 - 4743 active elements (257 deactivated)
Second run, for comparison
o2 = OceanDrift(loglevel=20) # Set loglevel to 0 for debug information
o2.add_reader([reader_norkyst, reader_arome])
o2.set_config('drift:relative_wind', True)
o2.set_config('drift:vertical_mixing', False)
o2.seed_elements(lon, lat, radius=50, number=5000, time=time)
o2.run(steps=48*2, time_step=1800, time_step_output=3600*2)
20:12:50 INFO opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)
20:12:50 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...
20:12:50 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_height: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: upward_sea_water_velocity: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_to_direction: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_significant_height: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_to_direction: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_mean_period: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_significant_height: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: surface_downward_x_stress: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: surface_downward_y_stress: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: turbulent_kinetic_energy: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: turbulent_generic_length_scale: 0.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
20:12:50 INFO opendrift.models.basemodel.environment:248: sea_floor_depth_below_sea_level: 10000.000000
20:12:50 INFO opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:12:50 INFO opendrift.models.basemodel:946: All points are in ocean
20:12:50 INFO opendrift.models.basemodel:2035: 2015-11-16 00:00:00 - step 1 of 96 - 84 active elements (0 deactivated)
20:12:50 INFO opendrift.models.basemodel:2035: 2015-11-16 00:30:00 - step 2 of 96 - 167 active elements (0 deactivated)
20:12:50 INFO opendrift.models.basemodel:2035: 2015-11-16 01:00:00 - step 3 of 96 - 250 active elements (0 deactivated)
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Animate and compare the two runs
o.animation(compare=o2, legend=['Absolute wind', 'Relative wind'])
/opt/conda/envs/opendrift/lib/python3.11/site-packages/cartopy/mpl/geoaxes.py:1692: UserWarning: No data for colormapping provided via 'c'. Parameters 'cmap' will be ignored
result = super().scatter(*args, **kwargs)
20:13:18 INFO opendrift.models.basemodel:4613: Saving animation to /root/project/docs/source/gallery/animations/example_relative_0.gif...
20:14:47 INFO opendrift.models.basemodel:3037: Time to make animation: 0:01:52.856139
o.plot(compare=o2, legend=['Absolute wind', 'Relative wind'], fast=True)
20:14:47 WARNING opendrift.models.basemodel:2410: Plotting fast. This will make your plots less accurate.
(<GeoAxes: title={'center': 'OpenDrift - OceanDrift\n2015-11-16 00:00 to 2015-11-18 00:00 UTC (25 steps)'}>, <Figure size 558.487x1100 with 1 Axes>)
Total running time of the script: (2 minutes 38.157 seconds)