.. DO NOT EDIT. .. THIS FILE WAS AUTOMATICALLY GENERATED BY SPHINX-GALLERY. .. TO MAKE CHANGES, EDIT THE SOURCE PYTHON FILE: .. "gallery/example_oil_thickness.py" .. LINE NUMBERS ARE GIVEN BELOW. .. only:: html .. note:: :class: sphx-glr-download-link-note :ref:`Go to the end ` to download the full example code .. rst-class:: sphx-glr-example-title .. _sphx_glr_gallery_example_oil_thickness.py: Oil film thickness ================================== .. GENERATED FROM PYTHON SOURCE LINES 6-21 .. code-block:: Python 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' .. GENERATED FROM PYTHON SOURCE LINES 22-23 First run, where surface oil thickness is updated .. GENERATED FROM PYTHON SOURCE LINES 23-24 .. code-block:: Python o1 = OpenOil(loglevel=20, weathering_model='noaa') .. rst-class:: sphx-glr-script-out .. code-block:: none 21:45:20 INFO opendrift.models.basemodel:529: OpenDriftSimulation initialised (version 1.11.1 / v1.11.1-74-g4504ea0) .. GENERATED FROM PYTHON SOURCE LINES 25-26 Northwards wind, eastwards current .. GENERATED FROM PYTHON SOURCE LINES 26-33 .. code-block:: Python 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) .. GENERATED FROM PYTHON SOURCE LINES 34-35 Using Johansen droplet spectrum, which depends on oil film thickness .. GENERATED FROM PYTHON SOURCE LINES 35-49 .. code-block:: Python 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) .. rst-class:: sphx-glr-script-out .. code-block:: none 21:45:20 INFO opendrift.models.openoil.adios.dirjs:90: Querying ADIOS database for oil: GENERIC DIESEL 21:45:20 INFO opendrift.models.openoil.openoil:1720: Using density 841.2 and viscosity 6.3404392151148136e-06 of oiltype GENERIC DIESEL 21:45:20 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... 21:45:26 INFO opendrift.models.basemodel.environment:247: Fallback values will be used for the following variables which have no readers: 21:45:26 INFO opendrift.models.basemodel.environment:250: x_sea_water_velocity: 0.100000 21:45:26 INFO opendrift.models.basemodel.environment:250: y_sea_water_velocity: 0.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: x_wind: 0.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: y_wind: 7.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: upward_sea_water_velocity: 0.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_surface_wave_significant_height: 0.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_surface_wave_stokes_drift_x_velocity: 0.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_surface_wave_stokes_drift_y_velocity: 0.300000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_ice_area_fraction: 0.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_ice_x_velocity: 0.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_ice_y_velocity: 0.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_water_temperature: 10.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_water_salinity: 34.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: sea_floor_depth_below_sea_level: 10000.000000 21:45:26 INFO opendrift.models.basemodel.environment:250: ocean_vertical_diffusivity: 0.020000 21:45:26 INFO opendrift.models.basemodel.environment:250: ocean_mixed_layer_thickness: 50.000000 21:45:26 INFO opendrift.models.basemodel:892: Using existing reader for land_binary_mask 21:45:26 INFO opendrift.models.basemodel:904: All points are in ocean 21:45:26 INFO opendrift.models.openoil.openoil:690: Oil-water surface tension is 0.029464 Nm 21:45:26 INFO opendrift.models.openoil.openoil:703: Max water fraction not available for GENERIC DIESEL, using default 21:45:26 INFO opendrift.models.basemodel:1995: 2024-03-24 21:45:20.653891 - 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GENERATED FROM PYTHON SOURCE LINES 50-52 Animation shows how oil thickness evolves, and decreases due to evaporation and spreading .. GENERATED FROM PYTHON SOURCE LINES 52-57 .. code-block:: Python 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) .. rst-class:: sphx-glr-script-out .. code-block:: none 21:45:44 WARNING opendrift.models.basemodel:2362: Plotting fast. This will make your plots less accurate. 21:45:46 INFO opendrift.models.basemodel:4546: Saving animation to /root/project/docs/source/gallery/animations/example_oil_thickness_0.gif... 21:45:51 INFO opendrift.models.basemodel:2986: Time to make animation: 0:00:06.528850 .. GENERATED FROM PYTHON SOURCE LINES 58-59 .. image:: /gallery/animations/example_oil_thickness_0.gif .. GENERATED FROM PYTHON SOURCE LINES 61-62 Second run, identical but without updating surface oil thickness .. GENERATED FROM PYTHON SOURCE LINES 62-85 .. code-block:: Python 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) .. rst-class:: sphx-glr-script-out .. code-block:: none 21:45:51 INFO opendrift.models.basemodel:529: OpenDriftSimulation initialised (version 1.11.1 / v1.11.1-74-g4504ea0) 21:45:51 INFO opendrift.models.openoil.adios.dirjs:90: Querying ADIOS database for oil: GENERIC DIESEL 21:45:51 INFO opendrift.models.openoil.openoil:1720: Using density 841.2 and viscosity 6.3404392151148136e-06 of oiltype GENERIC DIESEL 21:45:51 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... 21:45:51 INFO opendrift.models.basemodel.environment:247: Fallback values will be used for the following variables which have no readers: 21:45:51 INFO opendrift.models.basemodel.environment:250: x_sea_water_velocity: 0.100000 21:45:51 INFO opendrift.models.basemodel.environment:250: y_sea_water_velocity: 0.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: x_wind: 0.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: y_wind: 7.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: upward_sea_water_velocity: 0.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_surface_wave_significant_height: 0.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_surface_wave_stokes_drift_x_velocity: 0.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_surface_wave_stokes_drift_y_velocity: 0.300000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_ice_area_fraction: 0.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_ice_x_velocity: 0.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_ice_y_velocity: 0.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_water_temperature: 10.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_water_salinity: 34.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: sea_floor_depth_below_sea_level: 10000.000000 21:45:51 INFO opendrift.models.basemodel.environment:250: ocean_vertical_diffusivity: 0.020000 21:45:51 INFO opendrift.models.basemodel.environment:250: ocean_mixed_layer_thickness: 50.000000 21:45:51 INFO opendrift.models.basemodel:892: Using existing reader for land_binary_mask 21:45:51 INFO opendrift.models.basemodel:904: All points are in ocean 21:45:51 INFO opendrift.models.openoil.openoil:690: Oil-water surface tension is 0.029464 Nm 21:45:51 INFO opendrift.models.openoil.openoil:703: Max water fraction not available for GENERIC DIESEL, using default 21:45:51 INFO opendrift.models.basemodel:1995: 2024-03-24 21:45:51.106591 - 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GENERATED FROM PYTHON SOURCE LINES 86-87 Comparison plots .. GENERATED FROM PYTHON SOURCE LINES 87-90 .. code-block:: Python o1.plot_oil_budget() o2.plot_oil_budget() .. rst-class:: sphx-glr-horizontal * .. image-sg:: /gallery/images/sphx_glr_example_oil_thickness_001.png :alt: GENERIC DIESEL (841.2 kg/m3) - 2024-03-24 21:45 to 2024-03-25 17:45 :srcset: /gallery/images/sphx_glr_example_oil_thickness_001.png :class: sphx-glr-multi-img * .. image-sg:: /gallery/images/sphx_glr_example_oil_thickness_002.png :alt: GENERIC DIESEL (841.2 kg/m3) - 2024-03-24 21:45 to 2024-03-25 17:45 :srcset: /gallery/images/sphx_glr_example_oil_thickness_002.png :class: sphx-glr-multi-img .. GENERATED FROM PYTHON SOURCE LINES 91-92 Entrainment .. GENERATED FROM PYTHON SOURCE LINES 92-110 .. code-block:: Python 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() .. image-sg:: /gallery/images/sphx_glr_example_oil_thickness_003.png :alt: example oil thickness :srcset: /gallery/images/sphx_glr_example_oil_thickness_003.png :class: sphx-glr-single-img .. GENERATED FROM PYTHON SOURCE LINES 111-113 We see that with the updated film thickness, the droplets are getting gradually smaller .. GENERATED FROM PYTHON SOURCE LINES 113-122 .. code-block:: Python 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() .. image-sg:: /gallery/images/sphx_glr_example_oil_thickness_004.png :alt: example oil thickness :srcset: /gallery/images/sphx_glr_example_oil_thickness_004.png :class: sphx-glr-single-img .. rst-class:: sphx-glr-script-out .. code-block:: none /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) .. GENERATED FROM PYTHON SOURCE LINES 123-124 We see that oil film thickness has virtually no impact on horizontal drift .. GENERATED FROM PYTHON SOURCE LINES 124-128 .. code-block:: Python o1.animation(compare=o2, fast=True, legend=['Updated film thickness', 'Constant/default film thickness']) .. rst-class:: sphx-glr-script-out .. code-block:: none 21:46:22 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) 21:46:23 INFO opendrift.models.basemodel:4546: Saving animation to /root/project/docs/source/gallery/animations/example_oil_thickness_1.gif... 21:46:30 INFO opendrift.models.basemodel:2986: Time to make animation: 0:00:08.168992 .. GENERATED FROM PYTHON SOURCE LINES 129-130 .. image:: /gallery/animations/example_oil_thickness_1.gif .. rst-class:: sphx-glr-timing **Total running time of the script:** (1 minutes 11.871 seconds) .. _sphx_glr_download_gallery_example_oil_thickness.py: .. only:: html .. container:: sphx-glr-footer sphx-glr-footer-example .. container:: sphx-glr-download sphx-glr-download-jupyter :download:`Download Jupyter notebook: example_oil_thickness.ipynb ` .. container:: sphx-glr-download sphx-glr-download-python :download:`Download Python source code: example_oil_thickness.py ` .. only:: html .. rst-class:: sphx-glr-signature `Gallery generated by Sphinx-Gallery `_