Note
Go to the end to download the full example code.
Combining readers using operators
It is possible to combine readers using operators, to create e.g. a mean reader from different sources, or adding a constant force term to another sources.
See also
from datetime import timedelta
from opendrift.readers import reader_netCDF_CF_generic, reader_constant
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')
20:11:51 INFO opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)
20:11:51 INFO opendrift.readers:58: Opening file with xr.open_dataset
20:11:51 INFO opendrift.readers.reader_netCDF_CF_generic:337: Detected dimensions: {'time': 'time', 'x': 'x', 'y': 'y'}
20:11:51 INFO opendrift.readers:58: Opening file with xr.open_dataset
20:11:51 INFO opendrift.readers.reader_netCDF_CF_generic:337: Detected dimensions: {'x': 'X', 'y': 'Y', 'z': 'depth', 'time': 'time'}
First a regular simulation, without the added wind:
lw.add_reader([reader_arome, reader_norkyst])
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)
lw.run(duration=timedelta(hours=48), time_step=900, time_step_output=3600)
lw.plot(fast=True)
20:11:51 INFO opendrift.models.leeway:319: Seeding elements of object type 26: LIFE-RAFT-NB-1 (Life-raft, no ballast (NB) system, general (mean values))
20:11:51 INFO opendrift.models.basemodel.environment:218: Adding a dynamical landmask with max. priority based on assumed maximum speed of 5.0 m/s. Adding a customised landmask may be faster...
20:11:54 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:11:54 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:11:54 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.000000
20:11:55 INFO opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:11:55 INFO opendrift.models.basemodel:946: All points are in ocean
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20:12:03 WARNING opendrift.models.basemodel:2327: Missing variables: ['x_sea_water_velocity', 'y_sea_water_velocity']
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20:12:04 WARNING opendrift.models.basemodel:2410: Plotting fast. This will make your plots less accurate.
(<GeoAxes: title={'center': 'OpenDrift - Leeway (LIFE-RAFT-NB-1)\n2015-11-16 00:00 to 2015-11-18 00:00 UTC (49 steps)'}>, <Figure size 480.032x1100 with 1 Axes>)
Then a simulation where we add a constant x_wind component to cause stranding.
reader_onshore = reader_constant.Reader({ 'x_wind' : 10., 'y_wind': 0 })
If we just add all readers OpenDrift will read the wind from the first available reader, so we combine the wind reader and add them in order so that the combined reader is used first, then the actual sources are used next.
r0 = reader_onshore + reader_arome
print(r0)
lw2 = Leeway(loglevel=20) # Set loglevel to 0 for debug information
lw2.add_reader([r0, reader_arome, reader_norkyst])
===========================
Reader: Combined(constant_reader | /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc)
Projection:
+proj=latlong
Coverage: [degrees]
xmin: -180.000000 xmax: 180.000000
ymin: -90.000000 ymax: 90.000000
Corners (lon, lat):
(-180.00, 90.00) (180.00, 90.00)
(-180.00, -90.00) (180.00, -90.00)
Vertical levels [m]:
Not specified
Available time range:
start: 2015-11-16 00:00:00 end: 2015-11-18 18:00:00 step: None
Variables:
y_wind
wind_speed
x_wind
===========================
20:12:11 INFO opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)
Seed leeway elements at defined position and time
object_type = 26 # 26 = Life-raft, no ballast
lw2.seed_elements(lon=4.5, lat=59.6, radius=100, number=1000,
time=reader_arome.start_time, object_type=object_type)
20:12:11 INFO opendrift.models.leeway:319: Seeding elements of object type 26: LIFE-RAFT-NB-1 (Life-raft, no ballast (NB) system, general (mean values))
20:12:11 INFO opendrift.models.basemodel.environment:218: Adding a dynamical landmask with max. priority based on assumed maximum speed of 5.0 m/s. Adding a customised landmask may be faster...
20:12:11 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:12:11 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:12:11 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.000000
Running model
lw2.run(duration=timedelta(hours=48), time_step=900, time_step_output=3600)
20:12:11 INFO opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:12:11 INFO opendrift.models.basemodel:946: All points are in ocean
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20:12:14 INFO opendrift.models.basemodel:2035: 2015-11-17 06:45:00 - step 124 of 192 - 18 active elements (982 deactivated)
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20:12:14 INFO opendrift.models.basemodel:2035: 2015-11-17 07:30:00 - step 127 of 192 - 15 active elements (985 deactivated)
20:12:14 INFO opendrift.models.basemodel:2035: 2015-11-17 07:45:00 - step 128 of 192 - 13 active elements (987 deactivated)
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20:12:14 INFO opendrift.models.basemodel:2035: 2015-11-17 11:00:00 - step 141 of 192 - 9 active elements (991 deactivated)
20:12:14 INFO opendrift.models.basemodel:2035: 2015-11-17 11:15:00 - step 142 of 192 - 7 active elements (993 deactivated)
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20:12:14 INFO opendrift.models.basemodel:2035: 2015-11-17 13:00:00 - step 149 of 192 - 6 active elements (994 deactivated)
20:12:14 INFO opendrift.models.basemodel:2035: 2015-11-17 13:15:00 - step 150 of 192 - 6 active elements (994 deactivated)
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20:12:14 INFO opendrift.models.basemodel:2035: 2015-11-17 15:00:00 - step 157 of 192 - 5 active elements (995 deactivated)
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20:12:15 INFO opendrift.models.basemodel:2035: 2015-11-17 23:00:00 - step 189 of 192 - 2 active elements (998 deactivated)
20:12:15 INFO opendrift.models.basemodel:2035: 2015-11-17 23:15:00 - step 190 of 192 - 2 active elements (998 deactivated)
20:12:15 INFO opendrift.models.basemodel:2035: 2015-11-17 23:30:00 - step 191 of 192 - 2 active elements (998 deactivated)
20:12:15 INFO opendrift.models.basemodel:2035: 2015-11-17 23:45:00 - step 192 of 192 - 2 active elements (998 deactivated)
Print and plot results
print(lw2)
lw2.plot(fast=True)
===========================
--------------------
Reader performance:
--------------------
Combined(constant_reader | /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc)
--------------------
/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc
0:00:01.8 total
0:00:00.0 preparing
0:00:00.3 reading
0:00:00.1 interpolation
0:00:00.0 interpolation_time
0:00:01.4 rotating vectors
0:00:00.0 masking
--------------------
/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
0:00:03.3 total
0:00:00.0 preparing
0:00:00.6 reading
0:00:00.2 interpolation
0:00:00.0 interpolation_time
0:00:02.6 rotating vectors
0:00:00.0 masking
--------------------
global_landmask
0:00:00.1 total
0:00:00.0 preparing
0:00:00.0 reading
0:00:00.0 masking
--------------------
Performance:
3.8 total time
0.0 configuration
0.0 preparing main loop
0.0 moving elements to ocean
3.7 main loop
0.1 updating elements
0.0 cleaning up
--------------------
===========================
Model: Leeway (OpenDrift version 1.12.0)
2 active LeewayObj particles (998 deactivated, 0 scheduled)
-------------------
Environment variables:
-----
x_wind
y_wind
1) Combined(constant_reader | /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc)
2) /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc
-----
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:
sea_surface_wave_stokes_drift_x_velocity
sea_surface_wave_stokes_drift_y_velocity
Discarded readers:
Time:
Start: 2015-11-16 00:00:00 UTC
Present: 2015-11-18 00:00:00 UTC
Calculation steps: 192 * 0:15:00 - total time: 2 days, 0:00:00
Output steps: 49 * 1:00:00
===========================
20:12:15 WARNING opendrift.models.basemodel:2410: Plotting fast. This will make your plots less accurate.
(<GeoAxes: title={'center': 'OpenDrift - Leeway (LIFE-RAFT-NB-1)\n2015-11-16 00:00 to 2015-11-18 00:00 UTC (49 steps)'}>, <Figure size 458.219x1100 with 1 Axes>)
The first simulation compared to the second with extra wind:
lw.plot(fast=True, compare=lw2)
20:12:20 WARNING opendrift.models.basemodel:2410: Plotting fast. This will make your plots less accurate.
(<GeoAxes: title={'center': 'OpenDrift - Leeway (LIFE-RAFT-NB-1)\n2015-11-16 00:00 to 2015-11-18 00:00 UTC (49 steps)'}>, <Figure size 494.554x1100 with 1 Axes>)
Total running time of the script: (0 minutes 43.777 seconds)