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)
14:01:38 INFO opendrift.models.basemodel:539: OpenDriftSimulation initialised (version 1.10.7 / v1.10.6-119-g1da5bec)
14:01:38 INFO opendrift.readers.reader_netCDF_CF_generic:92: Opening dataset: /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
/opt/conda/envs/opendrift/lib/python3.11/site-packages/pyproj/crs/crs.py:1286: UserWarning: You will likely lose important projection information when converting to a PROJ string from another format. See: https://proj.org/faq.html#what-is-the-best-format-for-describing-coordinate-reference-systems
proj = self._crs.to_proj4(version=version)
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)
Running model
o.run(steps=66*2, time_step=1800)
14:01:39 INFO opendrift.models.basemodel:2591: Fallback values will be used for the following variables which have no readers:
14:01:39 INFO opendrift.models.basemodel:2594: x_wind: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: y_wind: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: upward_sea_water_velocity: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: ocean_vertical_diffusivity: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_wave_significant_height: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_wave_stokes_drift_x_velocity: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_wave_stokes_drift_y_velocity: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_swell_wave_to_direction: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_swell_wave_significant_height: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_wind_wave_to_direction: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_wind_wave_mean_period: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_surface_wind_wave_significant_height: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: surface_downward_x_stress: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: surface_downward_y_stress: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: turbulent_kinetic_energy: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: turbulent_generic_length_scale: 0.000000
14:01:39 INFO opendrift.models.basemodel:2594: ocean_mixed_layer_thickness: 50.000000
14:01:39 INFO opendrift.models.basemodel:2594: sea_floor_depth_below_sea_level: 10000.000000
14:01:39 INFO opendrift.models.basemodel:2753: Adding a dynamical landmask with max. priority based on assumed maximum speed of 1 m/s. Adding a customised landmask may be faster...
14:01:45 INFO opendrift.models.basemodel:1701: Using existing reader for land_binary_mask
14:01:45 INFO opendrift.models.basemodel:1715: Moving 217 out of 5000 points from land to water
14:01:45 INFO opendrift.models.basemodel:2882: 2015-11-16 00:00:00 - step 1 of 132 - 5000 active elements (0 deactivated)
/root/project/opendrift/readers/interpolation/interpolators.py:17: RuntimeWarning: overflow encountered in cast
data[mask] = np.finfo(np.float64).min
14:01:45 INFO opendrift.models.basemodel:2882: 2015-11-16 00:30:00 - step 2 of 132 - 5000 active elements (0 deactivated)
14:01:45 INFO opendrift.models.basemodel:2882: 2015-11-16 01:00:00 - step 3 of 132 - 4883 active elements (117 deactivated)
14:01:45 INFO opendrift.models.basemodel:2882: 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
0:00:00.0 total
0:00:00.0 preparing
0:00:00.0 reading
0:00:00.0 masking
--------------------
Performance:
15.3 total time
0.4 configuration
6.2 preparing main loop
5.9 making dynamical landmask
0.0 moving elements to ocean
4.2 readers
0.1 global_landmask
1.1 postprocessing
8.2 main loop
2.4 /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
0.4 updating elements
0.3 cleaning up
--------------------
===========================
Model: OceanDrift (OpenDrift version 1.10.7)
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_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
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
===========================
14:01:54 WARNING opendrift.models.basemodel:3226: 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)
14:01:56 INFO opendrift.models.basemodel:5350: Saving animation to /root/project/docs/source/gallery/animations/example_checkerboard_0.gif...
14:02:25 INFO opendrift.models.basemodel:3848: Time to make animation: 0:00:31.088520
o.plot()
0.1 ALPHA
(<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: (1 minutes 29.583 seconds)