Current from drifter

from datetime import datetime, timedelta
from opendrift.readers import reader_current_from_drifter
from opendrift.models.oceandrift import OceanDrift


o = OceanDrift(loglevel=20)
o.set_config('environment:fallback:land_binary_mask', 0)

20:13:41 INFO    opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)

We make a reader which reconstructs the ocean current from observed time series of a drifter This is actual data of SLDMB/Code drifter as used in this study: Jones, C.E., Dagestad, K.-F., Breivik, O., Holt, B., Rohrs, J., Christensen, K.H., Espeseth, M.M., Brekke, C., Skrunes, S. (2016): Measurement and modeling of oil slick transport. Journal of Geophysical Research - Oceans, Volume 121, Issue 10, October 2016, Pages 7759-7775. DOI: 10.1002/2016JC012113.

drifterlons = [2.407376, 2.405140, 2.403248, 2.401872, 2.400152, 2.398518, 2.397056, 2.395766, 2.394476, 2.393358, 2.392584, 2.391810, 2.390606, 2.389316, 2.388628, 2.388370, 2.387940, 2.387510, 2.387338, 2.387166, 2.387252, 2.387338, 2.387682, 2.387854, 2.388284, 2.388628, 2.389230, 2.390004, 2.390434, 2.390692, 2.391380, 2.391896, 2.392068, 2.392154, 2.392068, 2.391896, 2.391896, 2.391896, 2.391638, 2.391380, 2.391208, 2.391036, 2.390692, 2.390090, 2.389660, 2.389058, 2.388628]
drifterlats = [60.034740, 60.033880, 60.033106, 60.032246, 60.031300, 60.030182, 60.028892, 60.027602, 60.026656, 60.025538, 60.024420, 60.023388, 60.022442, 60.021496, 60.020378, 60.019346, 60.018572, 60.017626, 60.016852, 60.016164, 60.015734, 60.015304, 60.014616, 60.014100, 60.013670, 60.013412, 60.013240, 60.013068, 60.013154, 60.013412, 60.013584, 60.013842, 60.014186, 60.014616, 60.015218, 60.015820, 60.016594, 60.017454, 60.018400, 60.019346, 60.020464, 60.021410, 60.022442, 60.023474, 60.024678, 60.025882, 60.026914]
drifterlats = drifterlats[::-1]
drifterlons = drifterlons[::-1]
driftertimes = [datetime(2015, 6, 10, 5, 50) +
    timedelta(minutes=10)*i for i in range(len(drifterlons))]

r = reader_current_from_drifter.Reader(
        lons=drifterlons, lats=drifterlats, times=driftertimes)
o.add_reader(r)

We seed elements within polygon, as could have been extracted from remote sensing imagery

lons = [2.39, 2.391, 2.392, 2.393, 2.394, 2.393, 2.392, 2.391, 2.39]
lats = [60.02, 60.02, 60.019, 60.02, 60.021, 60.022, 60.021, 60.021, 60.02]
o.seed_within_polygon(lons=lons, lats=lats,
                      number=2000, time=r.start_time)

20:13:41 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...
20:13:44 INFO    opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_height: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    x_wind: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    y_wind: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    upward_sea_water_velocity: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    ocean_vertical_diffusivity: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_significant_height: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_stokes_drift_y_velocity: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_swell_wave_to_direction: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_swell_wave_significant_height: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wind_wave_to_direction: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wind_wave_mean_period: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_surface_wind_wave_significant_height: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    surface_downward_x_stress: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    surface_downward_y_stress: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    turbulent_kinetic_energy: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    turbulent_generic_length_scale: 0.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    ocean_mixed_layer_thickness: 50.000000
20:13:44 INFO    opendrift.models.basemodel.environment:248:    sea_floor_depth_below_sea_level: 10000.000000

Finally running simulation

o.run(end_time=r.end_time, time_step=r.time_step)

o.animation(buffer=.01, fast=True, drifter={'time': driftertimes, 'lon': drifterlons, 'lat': drifterlats,
    'label': 'CODE Drifter', 'color': 'b', 'linewidth': 2, 'markersize': 40})

20:13:45 INFO    opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:13:45 INFO    opendrift.models.basemodel:946: All points are in ocean
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20:13:47 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)
20:13:49 INFO    opendrift.models.basemodel:4613: Saving animation to /root/project/docs/source/gallery/animations/example_current_from_drifter_0.gif...
20:14:18 INFO    opendrift.models.basemodel:3037: Time to make animation: 0:00:31.452427

Drifter track is shown in red, and simulated trajectories are shown in gray. Oil spill is displaced relative to drifter, but drifter current is assumed to be spatially homogeneous.

o.plot(buffer=.01, fast=True, drifter={
        'lon': drifterlons, 'lat': drifterlats,
        'time': driftertimes, 'linewidth': 2, 'color': 'r'})

20:14:18 WARNING opendrift.models.basemodel:2410: Plotting fast. This will make your plots less accurate.

(<GeoAxes: title={'center': 'OpenDrift - OceanDrift\n2015-06-10 05:50 to 2015-06-10 13:20 UTC (46 steps)'}>, <Figure size 714.948x1100 with 1 Axes>)