Compare

Comparing two oil drift simulation runs, with and without wind

from datetime import timedelta
from opendrift.readers import reader_netCDF_CF_generic
from opendrift.models.openoil import OpenOil

o = OpenOil(loglevel=20)  # Set loglevel to 0 for debug information

# Arome atmospheric model
reader_arome = reader_netCDF_CF_generic.Reader(o.test_data_folder() +
    '16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc')
# Norkyst ocean model
reader_norkyst = reader_netCDF_CF_generic.Reader(o.test_data_folder() +
    '16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc')

o.add_reader([reader_norkyst, reader_arome])

# Seeding some particles
lon = 4.5; lat = 60.0; # Outside Bergen
time = [reader_arome.start_time,
        reader_arome.start_time + timedelta(hours=30)]
o.seed_elements(lon, lat, radius=50, number=5000, time=time,
                oil_type='GENERIC HEAVY CRUDE',
                wind_drift_factor=0.03) # 3% wind drift

# Running model
o.run(steps=66, time_step=1800, time_step_output=3600)

# Second run, for comparison
o2 = OpenOil(loglevel=20)  # Set loglevel to 0 for debug information
o2.add_reader([reader_norkyst, reader_arome])
o2.seed_elements(lon, lat, radius=50, number=5000, time=time,
                 oil_type='GENERIC HEAVY CRUDE',
                 wind_drift_factor=0.0) # No wind drift
o2.run(steps=66, time_step=1800, time_step_output=3600)
21:47:55 INFO    opendrift.models.basemodel:529: OpenDriftSimulation initialised (version 1.11.1 / v1.11.1-74-g4504ea0)
21:47:55 INFO    opendrift.readers.reader_netCDF_CF_generic:97: Opening dataset: /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc
21:47:55 INFO    opendrift.readers.reader_netCDF_CF_generic:309: Detected dimensions: {'time': 'time', 'x': 'x', 'y': 'y'}
21:47:55 INFO    opendrift.readers.reader_netCDF_CF_generic:97: Opening dataset: /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
21:47:55 INFO    opendrift.readers.reader_netCDF_CF_generic:309: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}
21:47:55 INFO    opendrift.models.openoil.adios.dirjs:90: Querying ADIOS database for oil: GENERIC HEAVY CRUDE
21:47:55 INFO    opendrift.models.openoil.openoil:1720: Using density 938.0 and viscosity 0.0010573364220196155 of oiltype GENERIC HEAVY CRUDE
21:47:55 INFO    opendrift.models.basemodel.environment:220: Adding a dynamical landmask with max. priority based on assumed maximum speed of 1.0 m/s. Adding a customised landmask may be faster...
21:48:01 INFO    opendrift.models.basemodel.environment:247: Fallback values will be used for the following variables which have no readers:
21:48:01 INFO    opendrift.models.basemodel.environment:250:    upward_sea_water_velocity: 0.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_surface_wave_significant_height: 0.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_surface_wave_stokes_drift_x_velocity: 0.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_surface_wave_stokes_drift_y_velocity: 0.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_ice_area_fraction: 0.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_ice_x_velocity: 0.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_ice_y_velocity: 0.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_water_temperature: 10.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_water_salinity: 34.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    sea_floor_depth_below_sea_level: 10000.000000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    ocean_vertical_diffusivity: 0.020000
21:48:01 INFO    opendrift.models.basemodel.environment:250:    ocean_mixed_layer_thickness: 50.000000
21:48:01 INFO    opendrift.models.basemodel:892: Using existing reader for land_binary_mask
21:48:01 INFO    opendrift.models.basemodel:904: All points are in ocean
21:48:01 INFO    opendrift.models.openoil.openoil:690: Oil-water surface tension is 0.033960 Nm
21:48:01 INFO    opendrift.models.openoil.openoil:703: Max water fraction not available for GENERIC HEAVY CRUDE, using default
21:48:01 INFO    opendrift.models.basemodel:1995: 2015-11-16 00:00:00 - step 1 of 66 - 84 active elements (0 deactivated)
21:48:01 INFO    opendrift.models.basemodel:1995: 2015-11-16 00:30:00 - step 2 of 66 - 167 active elements (0 deactivated)
21:48:01 INFO    opendrift.models.basemodel:1995: 2015-11-16 01:00:00 - step 3 of 66 - 250 active elements (0 deactivated)
21:48:01 INFO    opendrift.models.basemodel:1995: 2015-11-16 01:30:00 - step 4 of 66 - 334 active elements (0 deactivated)
21:48:01 INFO    opendrift.models.basemodel:1995: 2015-11-16 02:00:00 - step 5 of 66 - 417 active elements (0 deactivated)
21:48:01 INFO    opendrift.models.basemodel:1995: 2015-11-16 02:30:00 - step 6 of 66 - 500 active elements (0 deactivated)
21:48:01 INFO    opendrift.models.basemodel:1995: 2015-11-16 03:00:00 - step 7 of 66 - 584 active elements (0 deactivated)
21:48:02 INFO    opendrift.models.basemodel:1995: 2015-11-16 03:30:00 - step 8 of 66 - 667 active elements (0 deactivated)
21:48:02 INFO    opendrift.models.basemodel:1995: 2015-11-16 04:00:00 - step 9 of 66 - 750 active elements (0 deactivated)
21:48:02 INFO    opendrift.models.basemodel:1995: 2015-11-16 04:30:00 - step 10 of 66 - 834 active elements (0 deactivated)
21:48:02 INFO    opendrift.models.basemodel:1995: 2015-11-16 05:00:00 - step 11 of 66 - 917 active elements (0 deactivated)
21:48:02 INFO    opendrift.models.basemodel:1995: 2015-11-16 05:30:00 - step 12 of 66 - 1000 active elements (0 deactivated)
21:48:02 INFO    opendrift.models.basemodel:1995: 2015-11-16 06:00:00 - step 13 of 66 - 1084 active elements (0 deactivated)
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21:48:02 INFO    opendrift.models.basemodel:1995: 2015-11-16 07:00:00 - step 15 of 66 - 1250 active elements (0 deactivated)
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21:48:03 INFO    opendrift.models.basemodel:1995: 2015-11-16 10:30:00 - step 22 of 66 - 1833 active elements (0 deactivated)
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21:48:03 INFO    opendrift.models.basemodel:1995: 2015-11-16 12:00:00 - step 25 of 66 - 2083 active elements (0 deactivated)
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21:48:05 INFO    opendrift.models.basemodel:1995: 2015-11-16 19:30:00 - step 40 of 66 - 3333 active elements (0 deactivated)
21:48:05 WARNING opendrift.readers.basereader.structured:321: Data block from /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc not large enough to cover element positions within timestep. Buffer size (7) must be increased. See `Variables.set_buffer_size`.
21:48:06 INFO    opendrift.models.basemodel:1995: 2015-11-16 20:00:00 - step 41 of 66 - 3416 active elements (0 deactivated)
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21:48:10 INFO    opendrift.models.basemodel:1995: 2015-11-17 08:30:00 - step 66 of 66 - 2640 active elements (2360 deactivated)
21:48:10 INFO    opendrift.models.basemodel:529: OpenDriftSimulation initialised (version 1.11.1 / v1.11.1-74-g4504ea0)
21:48:10 INFO    opendrift.models.openoil.adios.dirjs:90: Querying ADIOS database for oil: GENERIC HEAVY CRUDE
21:48:10 INFO    opendrift.models.openoil.openoil:1720: Using density 938.0 and viscosity 0.0010573364220196155 of oiltype GENERIC HEAVY CRUDE
21:48:10 INFO    opendrift.models.basemodel.environment:220: Adding a dynamical landmask with max. priority based on assumed maximum speed of 1.0 m/s. Adding a customised landmask may be faster...
21:48:10 INFO    opendrift.models.basemodel.environment:247: Fallback values will be used for the following variables which have no readers:
21:48:10 INFO    opendrift.models.basemodel.environment:250:    upward_sea_water_velocity: 0.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_surface_wave_significant_height: 0.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_surface_wave_stokes_drift_x_velocity: 0.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_surface_wave_stokes_drift_y_velocity: 0.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_ice_area_fraction: 0.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_ice_x_velocity: 0.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_ice_y_velocity: 0.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_water_temperature: 10.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_water_salinity: 34.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    sea_floor_depth_below_sea_level: 10000.000000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    ocean_vertical_diffusivity: 0.020000
21:48:10 INFO    opendrift.models.basemodel.environment:250:    ocean_mixed_layer_thickness: 50.000000
21:48:11 INFO    opendrift.models.basemodel:892: Using existing reader for land_binary_mask
21:48:11 INFO    opendrift.models.basemodel:904: All points are in ocean
21:48:11 INFO    opendrift.models.openoil.openoil:690: Oil-water surface tension is 0.033960 Nm
21:48:11 INFO    opendrift.models.openoil.openoil:703: Max water fraction not available for GENERIC HEAVY CRUDE, using default
21:48:11 INFO    opendrift.models.basemodel:1995: 2015-11-16 00:00:00 - step 1 of 66 - 84 active elements (0 deactivated)
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21:48:11 INFO    opendrift.models.basemodel:1995: 2015-11-16 04:00:00 - step 9 of 66 - 750 active elements (0 deactivated)
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Animate and compare the two runs. We see that there is much more stranding of oil when wind is considered.

o.animation(fast=True, compare=o2,
            legend=['Current + 3 % wind drift', 'Current only'])
21:48:20 WARNING opendrift.models.basemodel:2362: Plotting fast. This will make your plots less accurate.
/opt/conda/envs/opendrift/lib/python3.11/site-packages/cartopy/mpl/geoaxes.py:1696: UserWarning: No data for colormapping provided via 'c'. Parameters 'cmap' will be ignored
  result = super().scatter(*args, **kwargs)
21:48:22 INFO    opendrift.models.basemodel:4546: Saving animation to /root/project/docs/source/gallery/animations/example_compare_0.gif...
21:48:30 INFO    opendrift.models.basemodel:2986: Time to make animation: 0:00:09.810247
../_images/example_compare_0.gif
o.plot(fast=True, compare=o2,
       legend=['Current + 3 % wind drift', 'Current only'])
OpenDrift - OpenOil (GENERIC HEAVY CRUDE) 2015-11-16 00:00 to 2015-11-17 09:00 UTC (34 steps)
21:48:30 WARNING opendrift.models.basemodel:2362: Plotting fast. This will make your plots less accurate.

(<GeoAxes: title={'center': 'OpenDrift - OpenOil (GENERIC HEAVY CRUDE)\n2015-11-16 00:00 to 2015-11-17 09:00 UTC (34 steps)'}>, <Figure size 626.904x1100 with 1 Axes>)

Total running time of the script: (1 minutes 2.922 seconds)

Gallery generated by Sphinx-Gallery