Note

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Leeway

from datetime import timedelta
import cmocean
from opendrift.readers import reader_netCDF_CF_generic
from opendrift.models.leeway import Leeway

lw = Leeway(loglevel=20)  # Set loglevel to 0 for debug information

# Atmospheric model for wind
#reader_arome = reader_netCDF_CF_generic.Reader('https://thredds.met.no/thredds/dodsC/mepslatest/meps_lagged_6_h_latest_2_5km_latest.nc')
reader_arome = reader_netCDF_CF_generic.Reader(lw.test_data_folder() +
    '16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc')

# Ocean model for current
#reader_norkyst = reader_netCDF_CF_generic.Reader('https://thredds.met.no/thredds/dodsC/mepslatest/meps_lagged_6_h_latest_2_5km_latest.nc')
reader_norkyst = reader_netCDF_CF_generic.Reader(lw.test_data_folder() +
    '16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc')

Out:

16:13:32 INFO    opendrift.models.basemodel: OpenDriftSimulation initialised (version 1.7.1 / v1.7.1-145-gdf95ed3)
16:13:32 INFO    opendrift.readers.reader_netCDF_CF_generic: Opening dataset: /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc
16:13:32 INFO    opendrift.readers.reader_netCDF_CF_generic: Opening dataset: /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc

Adding readers successively, and specifying which variables they shall provide. This way, order of adding readers does not matter

lw.add_reader(reader_norkyst,
              variables=['x_sea_water_velocity', 'y_sea_water_velocity'])
lw.add_reader(reader_arome, variables=['x_wind', 'y_wind'])
lw.set_config('environment:fallback:x_sea_water_velocity', 0)
lw.set_config('environment:fallback:y_sea_water_velocity', 0)

Seed leeway elements at defined position and time

object_type = 26  # 26 = Life-raft, no ballast
lw.seed_elements(lon=4.5, lat=59.6, radius=100, number=1000,
                 time=reader_arome.start_time, object_type=object_type)

Out:

16:13:32 INFO    opendrift.models.leeway: Seeding elements of object type 26: LIFE-RAFT-NB-1 (Life-raft, no ballast (NB) system, general (mean values))

Running model

lw.run(duration=timedelta(hours=48), time_step=900, time_step_output=3600)

Out:

16:13:32 INFO    opendrift.models.basemodel: Adding a dynamical landmask with max. priority based on assumed maximum speed of 5 m/s. Adding a customised landmask may be faster...
16:13:35 INFO    opendrift.models.basemodel: Using existing reader for land_binary_mask
16:13:35 INFO    opendrift.models.basemodel: All points are in ocean
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16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 17:45:00 - step 168 of 192 - 278 active elements (722 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 18:00:00 - step 169 of 192 - 274 active elements (726 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 18:15:00 - step 170 of 192 - 273 active elements (727 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 18:30:00 - step 171 of 192 - 270 active elements (730 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 18:45:00 - step 172 of 192 - 267 active elements (733 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 19:00:00 - step 173 of 192 - 263 active elements (737 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 19:15:00 - step 174 of 192 - 258 active elements (742 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 19:30:00 - step 175 of 192 - 256 active elements (744 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 19:45:00 - step 176 of 192 - 253 active elements (747 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 20:00:00 - step 177 of 192 - 252 active elements (748 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 20:15:00 - step 178 of 192 - 250 active elements (750 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 20:30:00 - step 179 of 192 - 249 active elements (751 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 20:45:00 - step 180 of 192 - 244 active elements (756 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 21:00:00 - step 181 of 192 - 244 active elements (756 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 21:15:00 - step 182 of 192 - 240 active elements (760 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 21:30:00 - step 183 of 192 - 237 active elements (763 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 21:45:00 - step 184 of 192 - 235 active elements (765 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 22:00:00 - step 185 of 192 - 233 active elements (767 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 22:15:00 - step 186 of 192 - 232 active elements (768 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 22:30:00 - step 187 of 192 - 231 active elements (769 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 22:45:00 - step 188 of 192 - 227 active elements (773 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 23:00:00 - step 189 of 192 - 227 active elements (773 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 23:15:00 - step 190 of 192 - 225 active elements (775 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 23:30:00 - step 191 of 192 - 222 active elements (778 deactivated)
16:13:41 INFO    opendrift.models.basemodel: 2015-11-17 23:45:00 - step 192 of 192 - 221 active elements (779 deactivated)

Print and plot results

print(lw)

Out:

===========================
--------------------
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
 0:00:00.3  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
 0:00:00.1  reading
 0:00:00.0  interpolation
 0:00:00.0  interpolation_time
 0:00:02.0  rotating vectors
 0:00:00.0  masking
--------------------
global_landmask
 0:00:00.2  total
 0:00:00.0  preparing
 0:00:00.2  reading
 0:00:00.0  masking
--------------------
Performance:
    9.2 total time
    0.2 configuration
    2.7 preparing main loop
      2.7 making dynamical landmask
      0.0 moving elements to ocean
      5.3 readers
        0.3 global_landmask
        0.1 postprocessing
    6.1 main loop
        2.4 /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
        2.3 /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc
      0.2 updating elements
    0.0 cleaning up
--------------------
===========================
Model:  Leeway     (OpenDrift version 1.7.1)
        215 active LeewayObj particles  (785 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

Time:
        Start: 2015-11-16 00:00:00
        Present: 2015-11-18 00:00:00
        Calculation steps: 192 * 0:15:00 - total time: 2 days, 0:00:00
        Output steps: 49 * 1:00:00
===========================

Animation with current as background. Note that drift is also depending on wind, which is not shown.

lw.animation(background=['x_sea_water_velocity', 'y_sea_water_velocity'],
             cmap=cmocean.cm.speed, vmin=0, vmax=.8, bgalpha=.7, land_color='#666666', fast=True)

Out:

16:13:41 WARNING opendrift.models.basemodel: Plotting fast. This will make your plots less accurate.
16:13:44 INFO    opendrift.models.basemodel: Saving animation to /root/project/docs/source/gallery/animations/example_leeway_0.gif...
16:13:44 INFO    opendrift.models.basemodel: Making animated gif...
MovieWriter imagemagick unavailable; using Pillow instead.
../_images/example_leeway_0.gif 
lw.plot(fast=True)
OpenDrift - Leeway (LIFE-RAFT-NB-1) 2015-11-16 00:00 to 2015-11-18 00:00 UTC (49 steps)

Out:

16:14:05 WARNING opendrift.models.basemodel: Plotting fast. This will make your plots less accurate.

(<GeoAxesSubplot:title={'center':'OpenDrift - Leeway (LIFE-RAFT-NB-1)\n2015-11-16 00:00 to 2015-11-18 00:00 UTC (49 steps)'}>, <module 'matplotlib.pyplot' from '/opt/conda/envs/opendrift/lib/python3.9/site-packages/matplotlib/pyplot.py'>)

Total running time of the script: ( 0 minutes 37.042 seconds)

Gallery generated by Sphinx-Gallery