Note
Go to the end to download the full example code.
Checkerboard
import numpy as np
from opendrift.readers import reader_global_landmask
from opendrift.readers import reader_netCDF_CF_generic
from opendrift.models.oceandrift import OceanDrift
o = OceanDrift(loglevel=20) # Set loglevel to 0 for debug information
# Norkyst
#reader_norkyst = reader_netCDF_CF_generic.Reader('https://thredds.met.no/thredds/dodsC/sea/norkyst800m/1h/aggregate_be')
reader_norkyst = reader_netCDF_CF_generic.Reader(o.test_data_folder() + '16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc')
o.add_reader([reader_norkyst])
o.set_config('drift:vertical_mixing', False)
20:11:09 INFO opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)
20:11:09 INFO opendrift.readers:58: Opening file with xr.open_dataset
20:11:10 INFO opendrift.readers.reader_netCDF_CF_generic:337: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}
Seeding particles in a checkerboard pattern
di = 5 # Horizontal number of particles per square
dj = 5 # Vertical number of particles per square
lons = np.linspace(3.5, 5.0, 100)
lats = np.linspace(60, 61, 100)
ii = np.arange(len(lons))//di
jj = np.arange(len(lats))//dj
ii, jj = np.meshgrid(ii, jj)
board = (ii+jj)%2 > 0
lons, lats = np.meshgrid(lons, lats)
lons = lons[board].ravel()
lats = lats[board].ravel()
o.seed_elements(lons, lats, radius=0, number=5000,
time=reader_norkyst.start_time)
20:11:10 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...
20:11:13 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_height: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: x_wind: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: y_wind: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: upward_sea_water_velocity: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_to_direction: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_significant_height: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_to_direction: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_mean_period: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_significant_height: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: surface_downward_x_stress: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: surface_downward_y_stress: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: turbulent_kinetic_energy: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: turbulent_generic_length_scale: 0.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
20:11:13 INFO opendrift.models.basemodel.environment:248: sea_floor_depth_below_sea_level: 10000.000000
Running model
o.run(steps=66*2, time_step=1800)
20:11:14 INFO opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:11:16 INFO opendrift.models.basemodel:948: Moving 217 out of 5000 points from land to water
20:11:16 INFO opendrift.models.basemodel:2035: 2015-11-16 00:00:00 - step 1 of 132 - 5000 active elements (0 deactivated)
20:11:16 INFO opendrift.models.basemodel:2035: 2015-11-16 00:30:00 - step 2 of 132 - 5000 active elements (0 deactivated)
20:11:17 INFO opendrift.models.basemodel:2035: 2015-11-16 01:00:00 - step 3 of 132 - 4883 active elements (117 deactivated)
20:11:18 INFO opendrift.models.basemodel:2035: 2015-11-16 01:30:00 - step 4 of 132 - 4811 active elements (189 deactivated)
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Print and plot results
print(o)
o.animation(fast=True)
===========================
--------------------
Reader performance:
--------------------
/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
0:00:02.2 total
0:00:00.0 preparing
0:00:00.6 reading
0:00:00.3 interpolation
0:00:00.0 interpolation_time
0:00:01.5 rotating vectors
0:00:00.0 masking
--------------------
global_landmask
0:00:01.6 total
0:00:00.0 preparing
0:00:01.6 reading
0:00:00.0 masking
--------------------
Performance:
16.8 total time
4.9 configuration
1.8 preparing main loop
1.5 moving elements to ocean
9.9 main loop
0.3 updating elements
0.0 cleaning up
--------------------
===========================
Model: OceanDrift (OpenDrift version 1.12.0)
3813 active Lagrangian3DArray particles (1187 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
-----
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
x_wind
y_wind
Discarded readers:
Time:
Start: 2015-11-16 00:00:00 UTC
Present: 2015-11-18 18:00:00 UTC
Calculation steps: 132 * 0:30:00 - total time: 2 days, 18:00:00
Output steps: 133 * 0:30:00
===========================
20:11:26 WARNING opendrift.models.basemodel:2410: 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)
20:11:29 INFO opendrift.models.basemodel:4613: Saving animation to /root/project/docs/source/gallery/animations/example_checkerboard_0.gif...
20:12:54 INFO opendrift.models.basemodel:3037: Time to make animation: 0:01:28.024596
o.plot()
(<GeoAxes: title={'center': 'OpenDrift - OceanDrift\n2015-11-16 00:00 to 2015-11-18 18:00 UTC (133 steps)'}>, <Figure size 586.224x1100 with 1 Axes>)
Total running time of the script: (2 minutes 33.413 seconds)