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Static 2D current field
from datetime import datetime, timedelta
import numpy as np
from opendrift.readers.reader_constant_2d import Reader
from opendrift.models.oceandrift import OceanDrift
Constructing a static, rotating ocean current field,
lon, lat = np.meshgrid(np.linspace(2,6,30), np.linspace(59,62,30))
lon0 = 4
lat0 = 60.5
u = -(lat-lat0)/np.sqrt((lon-lon0)**2 + (lat-lat0)**2)
v = (lon-lon0)/np.sqrt((lon-lon0)**2 + (lat-lat0)**2)
lon = np.linspace(0,5,30)
lat = np.linspace(59,62,30)
r = Reader(x=lon, y=lat, proj4='+proj=latlong',
array_dict = {'x_sea_water_velocity': u, 'y_sea_water_velocity': v})
o = OceanDrift(loglevel=20)
o.set_config('environment:fallback:land_binary_mask', 0)
o.add_reader(r)
o.seed_elements(lon=3, lat=60.5, number=1000, radius=30000, time=datetime.now())
o.run(duration=timedelta(hours=72))
o.animation(fast=True)
17:13:40 INFO opendrift:509: OpenDriftSimulation initialised (version 1.13.0 / v1.13.0-15-g93fccf7)
17:13:40 INFO opendrift.models.basemodel.environment:206: Adding a dynamical landmask with max. priority based on assumed maximum speed of 2.0 m/s. Adding a customised landmask may be faster...
17:13:44 INFO opendrift.models.basemodel.environment:233: Fallback values will be used for the following variables which have no readers:
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_height: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: x_wind: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: y_wind: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: upward_sea_water_velocity: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: ocean_vertical_diffusivity: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_wave_significant_height: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_wave_stokes_drift_x_velocity: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_wave_stokes_drift_y_velocity: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_swell_wave_to_direction: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_swell_wave_significant_height: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_wind_wave_to_direction: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_wind_wave_mean_period: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_surface_wind_wave_significant_height: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: surface_downward_x_stress: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: surface_downward_y_stress: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: turbulent_kinetic_energy: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: turbulent_generic_length_scale: 0.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: ocean_mixed_layer_thickness: 50.000000
17:13:44 INFO opendrift.models.basemodel.environment:236: sea_floor_depth_below_sea_level: 10000.000000
17:13:44 INFO opendrift:919: Using existing reader for land_binary_mask
17:13:44 INFO opendrift:930: All points are in ocean
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17:13:48 WARNING opendrift:2429: 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)
17:13:49 INFO opendrift:4611: Saving animation to /root/project/docs/source/gallery/animations/example_static_2d_current_0.gif...
17:14:29 INFO opendrift:3048: Time to make animation: 0:00:41.103042
Total running time of the script: (0 minutes 53.331 seconds)