Note
Go to the end to download the full example code.
Oil film thickness
from datetime import datetime, timedelta
import matplotlib.pyplot as plt
import numpy as np
from opendrift.models.openoil import OpenOil
number = 10000
timestep = timedelta(minutes=10)
timestep_output = timedelta(minutes=60)
duration = timedelta(hours=20)
mass_oil = 2000 # mass oil per particle
oil_type = 'GENERIC DIESEL'
#oil_type = 'GENERIC BUNKER C'
First run, where surface oil thickness is updated
o1 = OpenOil(loglevel=20, weathering_model='noaa')
17:23:21 INFO opendrift.models.basemodel:512: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-55-g4faa301)
Northwards wind, eastwards current
o1.set_config('environment:fallback:land_binary_mask', 0)
o1.set_config('environment:fallback:x_wind', 0)
o1.set_config('environment:fallback:y_wind', 7)
o1.set_config('environment:fallback:sea_surface_wave_stokes_drift_x_velocity', 0)
o1.set_config('environment:fallback:sea_surface_wave_stokes_drift_y_velocity', .3)
o1.set_config('environment:fallback:x_sea_water_velocity', .1)
o1.set_config('environment:fallback:y_sea_water_velocity', 0)
Using Johansen droplet spectrum, which depends on oil film thickness
o1.set_config('wave_entrainment:droplet_size_distribution',
'Johansen et al. (2015)')
o1.set_config('drift:wind_uncertainty', 2)
o1.set_config('drift:current_uncertainty', .1)
o1.set_config('processes:dispersion', False)
o1.set_config('processes:update_oilfilm_thickness', True)
o1.seed_elements(lon=4.5, lat=60, number=number,
mass_oil=mass_oil, radius=1000,
oil_type=oil_type,
time=datetime.utcnow())
o1.run(time_step=timestep, time_step_output=timestep_output,
duration=duration)
17:23:21 INFO opendrift.models.openoil.adios.dirjs:86: Querying ADIOS database for oil: GENERIC DIESEL
17:23:21 INFO opendrift.models.openoil.openoil:1715: Using density 855.84763 and viscosity 8.644570579524653e-06 of oiltype GENERIC DIESEL
17:23:21 INFO opendrift.models.basemodel.environment:218: Adding a dynamical landmask with max. priority based on assumed maximum speed of 1.3 m/s. Adding a customised landmask may be faster...
17:23:24 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
17:23:24 INFO opendrift.models.basemodel.environment:248: x_sea_water_velocity: 0.100000
17:23:24 INFO opendrift.models.basemodel.environment:248: y_sea_water_velocity: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: x_wind: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: y_wind: 7.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_surface_height: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: upward_sea_water_velocity: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.300000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_ice_area_fraction: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_ice_x_velocity: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_ice_y_velocity: 0.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_water_temperature: 10.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_water_salinity: 34.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: sea_floor_depth_below_sea_level: 10000.000000
17:23:24 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.020000
17:23:24 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
17:23:24 INFO opendrift.models.basemodel:932: Using existing reader for land_binary_mask
17:23:24 INFO opendrift.models.basemodel:943: All points are in ocean
17:23:24 INFO opendrift.models.openoil.openoil:684: Oil-water surface tension is 0.030314 Nm
17:23:24 INFO opendrift.models.openoil.openoil:697: Max water fraction not available for GENERIC DIESEL, using default
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Animation shows how oil thickness evolves, and decreases due to evaporation and spreading
unitfactor=1e6 # show film thickness in micrometers
o1.animation(color='oil_film_thickness', fast=True,
vmin=1e-7*unitfactor, vmax=1e-4*unitfactor,
unitfactor=unitfactor, surface_only=True)
17:23:43 WARNING opendrift.models.basemodel:2407: Plotting fast. This will make your plots less accurate.
17:23:45 INFO opendrift.models.basemodel:4606: Saving animation to /root/project/docs/source/gallery/animations/example_oil_thickness_0.gif...
17:24:00 INFO opendrift.models.basemodel:3034: Time to make animation: 0:00:16.853390
Second run, identical but without updating surface oil thickness
o2 = OpenOil(loglevel=20, weathering_model='noaa')
o2.set_config('environment:fallback:land_binary_mask', 0)
o2.set_config('environment:fallback:x_wind', 0)
o2.set_config('environment:fallback:y_wind', 7)
o2.set_config('environment:fallback:sea_surface_wave_stokes_drift_x_velocity', 0)
o2.set_config('environment:fallback:sea_surface_wave_stokes_drift_y_velocity', .3)
o2.set_config('environment:fallback:x_sea_water_velocity', .1)
o2.set_config('environment:fallback:y_sea_water_velocity', 0)
o2.set_config('wave_entrainment:droplet_size_distribution',
'Johansen et al. (2015)')
o2.set_config('drift:wind_uncertainty', 2)
o2.set_config('drift:current_uncertainty', .1)
o2.set_config('processes:dispersion', False)
o2.set_config('processes:update_oilfilm_thickness', False)
o2.seed_elements(lon=4.5, lat=60, number=number,
mass_oil=mass_oil, radius=1000,
oil_type=oil_type,
time=datetime.utcnow())
o2.run(time_step=timestep, time_step_output=timestep_output,
duration=duration)
17:24:00 INFO opendrift.models.basemodel:512: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-55-g4faa301)
17:24:00 INFO opendrift.models.openoil.adios.dirjs:86: Querying ADIOS database for oil: GENERIC DIESEL
17:24:00 INFO opendrift.models.openoil.openoil:1715: Using density 855.84763 and viscosity 8.644570579524653e-06 of oiltype GENERIC DIESEL
17:24:00 INFO opendrift.models.basemodel.environment:218: Adding a dynamical landmask with max. priority based on assumed maximum speed of 1.3 m/s. Adding a customised landmask may be faster...
17:24:00 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
17:24:00 INFO opendrift.models.basemodel.environment:248: x_sea_water_velocity: 0.100000
17:24:00 INFO opendrift.models.basemodel.environment:248: y_sea_water_velocity: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: x_wind: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: y_wind: 7.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_surface_height: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: upward_sea_water_velocity: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.300000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_ice_area_fraction: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_ice_x_velocity: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_ice_y_velocity: 0.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_water_temperature: 10.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_water_salinity: 34.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: sea_floor_depth_below_sea_level: 10000.000000
17:24:00 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.020000
17:24:00 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
17:24:00 INFO opendrift.models.basemodel:932: Using existing reader for land_binary_mask
17:24:00 INFO opendrift.models.basemodel:943: All points are in ocean
17:24:00 INFO opendrift.models.openoil.openoil:684: Oil-water surface tension is 0.030314 Nm
17:24:00 INFO opendrift.models.openoil.openoil:697: Max water fraction not available for GENERIC DIESEL, using default
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Comparison plots
o1.plot_oil_budget()
o2.plot_oil_budget()
Entrainment
b1 = o1.get_oil_budget()
b2 = o2.get_oil_budget()
plt.plot(b1['mass_surface'], '-r', linewidth=2,
label='Surface, updated thickness')
plt.plot(b1['mass_submerged'], '--r', linewidth=2,
label='Submerged, updated thickness')
plt.plot(b1['mass_evaporated'], '-.r', linewidth=2,
label='Evaporated, updated thickness')
plt.plot(b2['mass_surface'], '-b', linewidth=2,
label='Surface, constant thickness')
plt.plot(b2['mass_submerged'], '--b', linewidth=2,
label='Submerged, constant thickness')
plt.plot(b2['mass_evaporated'], '-.b', linewidth=2,
label='Evaporated, constant thickness')
plt.legend()
plt.xlabel('Time step')
plt.show()
We see that with the updated film thickness, the droplets are getting gradually smaller
r1 = o1.get_property('diameter')[0]
r2 = o2.get_property('diameter')[0]
plt.plot(np.median(r1*1e6, 1))
plt.plot(np.median(r2*1e6, 1))
plt.legend(['With updated film thickness', 'With constant film thickness'])
plt.xlabel('Time step')
plt.ylabel('Median droplet diameter [micrometer]')
plt.show()
/opt/conda/envs/opendrift/lib/python3.11/site-packages/numpy/core/fromnumeric.py:771: UserWarning: Warning: 'partition' will ignore the 'mask' of the MaskedArray.
a.partition(kth, axis=axis, kind=kind, order=order)
We see that oil film thickness has virtually no impact on horizontal drift
o1.animation(compare=o2, fast=True,
legend=['Updated film thickness',
'Constant/default film thickness'])
17:24:31 WARNING opendrift.models.basemodel:2407: Plotting fast. This will make your plots less accurate.
/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)
17:24:33 INFO opendrift.models.basemodel:4606: Saving animation to /root/project/docs/source/gallery/animations/example_oil_thickness_1.gif...
17:24:50 INFO opendrift.models.basemodel:3034: Time to make animation: 0:00:18.672841
Total running time of the script: (1 minutes 34.062 seconds)