Note
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Drifter
from datetime import timedelta
import numpy as np
from opendrift.readers import reader_netCDF_CF_generic
from opendrift.models.oceandrift import OceanDrift
o = OceanDrift(loglevel=20) # Basic drift model suitable for passive tracers or drifters
20:11:45 INFO opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)
Preparing Readers
reader_current = reader_netCDF_CF_generic.Reader(o.test_data_folder() +
'16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc')
reader_wind = reader_netCDF_CF_generic.Reader(o.test_data_folder() +
'16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc')
o.add_reader([reader_current, reader_wind])
# Prevent mixing elements downwards
o.set_config('drift:vertical_mixing', False)
20:11:45 INFO opendrift.readers:58: Opening file with xr.open_dataset
20:11:45 INFO opendrift.readers.reader_netCDF_CF_generic:337: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}
20:11:45 INFO opendrift.readers:58: Opening file with xr.open_dataset
20:11:45 INFO opendrift.readers.reader_netCDF_CF_generic:337: Detected dimensions: {'time': 'time', 'x': 'x', 'y': 'y'}
Seeding elements
Elements are moved with the ocean current, in addition to a fraction of the wind speed (wind_drift_factor). This factor depends on the properties of the elements. Typical empirical values are: - 0.035 (3.5 %) for oil and iSphere driftes - 0.01 (1 %) for CODE drifters partly submerged ~0.5 m As there are large uncertainties, it makes sense to provide a statistical distribution of wind_drift_factors
Using a constant value for all elements:
wind_drift_factor = 0.03
Giving each element a unique (random) wind_drift_factor
wind_drift_factor = np.random.uniform(0, 0.06, 2000)
o.seed_elements(4.7, 59.9, radius=3000, number=2000,
time=reader_current.start_time,
wind_drift_factor=wind_drift_factor)
20:11:45 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...
20:11:48 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_height: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: upward_sea_water_velocity: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_to_direction: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_significant_height: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_to_direction: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_mean_period: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_significant_height: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: surface_downward_x_stress: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: surface_downward_y_stress: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: turbulent_kinetic_energy: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: turbulent_generic_length_scale: 0.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
20:11:48 INFO opendrift.models.basemodel.environment:248: sea_floor_depth_below_sea_level: 10000.000000
Running model
o.run(time_step=timedelta(minutes=15),
time_step_output=timedelta(minutes=60))
20:11:49 INFO opendrift.models.basemodel:1862: Duration, steps or end time not specified, running until end of first reader: 2015-11-18 18:00:00
20:11:49 INFO opendrift.models.basemodel:1862: Duration, steps or end time not specified, running until end of first reader: 2015-11-18 18:00:00
20:11:49 INFO opendrift.models.basemodel:1862: Duration, steps or end time not specified, running until end of first reader: 2015-11-18 18:00:00
20:11:49 INFO opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:11:49 INFO opendrift.models.basemodel:946: All points are in ocean
20:11:49 INFO opendrift.models.basemodel:2035: 2015-11-16 00:00:00 - step 1 of 264 - 2000 active elements (0 deactivated)
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20:11:50 WARNING opendrift.readers.basereader.structured:324: Data block from /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc not large enough to cover element positions within timestep. Buffer size (5) must be increased. See `Variables.set_buffer_size`.
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20:11:50 WARNING opendrift.readers.basereader.structured:324: Data block from /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc not large enough to cover element positions within timestep. Buffer size (5) must be increased. See `Variables.set_buffer_size`.
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20:11:50 WARNING opendrift.readers.basereader.structured:324: Data block from /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc not large enough to cover element positions within timestep. Buffer size (5) must be increased. See `Variables.set_buffer_size`.
20:11:50 INFO opendrift.models.basemodel:2035: 2015-11-16 09:45:00 - step 40 of 264 - 2000 active elements (0 deactivated)
20:11:50 WARNING opendrift.readers.basereader.structured:324: Data block from /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc not large enough to cover element positions within timestep. Buffer size (5) must be increased. See `Variables.set_buffer_size`.
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20:12:01 INFO opendrift.models.basemodel:2035: 2015-11-18 17:45:00 - step 264 of 264 - 36 active elements (1964 deactivated)
Print and plot results
print(o)
o.animation(color='wind_drift_factor', fast=True)
===========================
--------------------
Reader performance:
--------------------
/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
0:00:02.4 total
0:00:00.0 preparing
0:00:00.4 reading
0:00:00.1 interpolation
0:00:00.0 interpolation_time
0:00:02.0 rotating vectors
0:00:00.0 masking
--------------------
/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc
0:00:02.2 total
0:00:00.0 preparing
0:00:00.2 reading
0:00:00.0 interpolation
0:00:00.0 interpolation_time
0:00:01.9 rotating vectors
0:00:00.0 masking
--------------------
global_landmask
0:00:01.6 total
0:00:00.0 preparing
0:00:01.5 reading
0:00:00.0 masking
--------------------
Performance:
16.1 total time
3.9 configuration
0.1 preparing main loop
0.0 moving elements to ocean
12.1 main loop
0.3 updating elements
0.0 cleaning up
--------------------
===========================
Model: OceanDrift (OpenDrift version 1.12.0)
36 active Lagrangian3DArray particles (1964 deactivated, 0 scheduled)
-------------------
Environment variables:
-----
x_sea_water_velocity
y_sea_water_velocity
1) /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
-----
x_wind
y_wind
1) /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc
-----
land_binary_mask
1) global_landmask
-----
Readers not added for the following variables:
ocean_mixed_layer_thickness
ocean_vertical_diffusivity
sea_floor_depth_below_sea_level
sea_surface_height
sea_surface_swell_wave_peak_period_from_variance_spectral_density
sea_surface_swell_wave_significant_height
sea_surface_swell_wave_to_direction
sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment
sea_surface_wave_period_at_variance_spectral_density_maximum
sea_surface_wave_significant_height
sea_surface_wave_stokes_drift_x_velocity
sea_surface_wave_stokes_drift_y_velocity
sea_surface_wind_wave_mean_period
sea_surface_wind_wave_significant_height
sea_surface_wind_wave_to_direction
surface_downward_x_stress
surface_downward_y_stress
turbulent_generic_length_scale
turbulent_kinetic_energy
upward_sea_water_velocity
Discarded readers:
Time:
Start: 2015-11-16 00:00:00 UTC
Present: 2015-11-18 18:00:00 UTC
Calculation steps: 264 * 0:15:00 - total time: 2 days, 18:00:00
Output steps: 67 * 1:00:00
===========================
20:12:01 WARNING opendrift.models.basemodel:2410: Plotting fast. This will make your plots less accurate.
20:12:04 INFO opendrift.models.basemodel:4613: Saving animation to /root/project/docs/source/gallery/animations/example_drifter_0.gif...
20:12:50 INFO opendrift.models.basemodel:3037: Time to make animation: 0:00:49.143849
# Plot trajectories, colored by the wind_drift_factor of each element
o.plot(linecolor='wind_drift_factor', fast=True)
20:12:50 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 18:00 UTC (67 steps)'}>, <Figure size 481.962x1100 with 2 Axes>)
Total running time of the script: (1 minutes 41.822 seconds)