Note
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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')
17:04:18 INFO opendrift.models.basemodel:533: OpenDriftSimulation initialised (version 1.11.2 / v1.11.2-17-g1eadfa7)
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)
17:04:18 INFO opendrift.models.openoil.adios.dirjs:90: Querying ADIOS database for oil: GENERIC DIESEL
17:04:18 INFO opendrift.models.openoil.openoil:1720: Using density 841.2 and viscosity 6.3404392151148136e-06 of oiltype GENERIC DIESEL
17:04:18 INFO opendrift.models.basemodel.environment:218: Adding a dynamical landmask with max. priority based on assumed maximum speed of 1.0 m/s. Adding a customised landmask may be faster...
17:04:23 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
17:04:23 INFO opendrift.models.basemodel.environment:248: x_sea_water_velocity: 0.100000
17:04:23 INFO opendrift.models.basemodel.environment:248: y_sea_water_velocity: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: x_wind: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: y_wind: 7.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_surface_height: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: upward_sea_water_velocity: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.300000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_ice_area_fraction: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_ice_x_velocity: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_ice_y_velocity: 0.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_water_temperature: 10.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_water_salinity: 34.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: sea_floor_depth_below_sea_level: 10000.000000
17:04:23 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.020000
17:04:23 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
17:04:23 INFO opendrift.models.basemodel:909: Using existing reader for land_binary_mask
17:04:23 INFO opendrift.models.basemodel:920: All points are in ocean
17:04:23 INFO opendrift.models.openoil.openoil:688: Oil-water surface tension is 0.029464 Nm
17:04:23 INFO opendrift.models.openoil.openoil:701: 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)
17:04:40 WARNING opendrift.models.basemodel:2377: Plotting fast. This will make your plots less accurate.
17:04:42 INFO opendrift.models.basemodel:4561: Saving animation to /root/project/docs/source/gallery/animations/example_oil_thickness_0.gif...
17:04:46 INFO opendrift.models.basemodel:3001: Time to make animation: 0:00:06.325228
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)
17:04:47 INFO opendrift.models.basemodel:533: OpenDriftSimulation initialised (version 1.11.2 / v1.11.2-17-g1eadfa7)
17:04:47 INFO opendrift.models.openoil.adios.dirjs:90: Querying ADIOS database for oil: GENERIC DIESEL
17:04:47 INFO opendrift.models.openoil.openoil:1720: Using density 841.2 and viscosity 6.3404392151148136e-06 of oiltype GENERIC DIESEL
17:04:47 INFO opendrift.models.basemodel.environment:218: Adding a dynamical landmask with max. priority based on assumed maximum speed of 1.0 m/s. Adding a customised landmask may be faster...
17:04:47 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
17:04:47 INFO opendrift.models.basemodel.environment:248: x_sea_water_velocity: 0.100000
17:04:47 INFO opendrift.models.basemodel.environment:248: y_sea_water_velocity: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: x_wind: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: y_wind: 7.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_surface_height: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: upward_sea_water_velocity: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.300000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_ice_area_fraction: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_ice_x_velocity: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_ice_y_velocity: 0.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_water_temperature: 10.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_water_salinity: 34.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: sea_floor_depth_below_sea_level: 10000.000000
17:04:47 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.020000
17:04:47 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
17:04:47 INFO opendrift.models.basemodel:909: Using existing reader for land_binary_mask
17:04:47 INFO opendrift.models.basemodel:920: All points are in ocean
17:04:47 INFO opendrift.models.openoil.openoil:688: Oil-water surface tension is 0.029464 Nm
17:04:47 INFO opendrift.models.openoil.openoil:701: 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'])
17:05:17 WARNING opendrift.models.basemodel:2377: 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)
17:05:19 INFO opendrift.models.basemodel:4561: Saving animation to /root/project/docs/source/gallery/animations/example_oil_thickness_1.gif...
17:05:26 INFO opendrift.models.basemodel:3001: Time to make animation: 0:00:08.403614
Total running time of the script: (1 minutes 11.070 seconds)