Note
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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')
13:13:30 INFO opendrift.models.basemodel:529: OpenDriftSimulation initialised (version 1.11.2 / v1.11.2-11-g21e4c60)
13:13:30 INFO opendrift.readers.reader_netCDF_CF_generic:102: Opening dataset: /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/arome_subset_16Nov2015.nc
13:13:30 INFO opendrift.readers.reader_netCDF_CF_generic:314: Detected dimensions: {'time': 'time', 'x': 'x', 'y': 'y'}
13:13:30 INFO opendrift.readers.reader_netCDF_CF_generic:102: Opening dataset: /root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
13:13:30 INFO opendrift.readers.reader_netCDF_CF_generic:314: 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)
13:13:30 INFO opendrift.models.leeway:262: Seeding elements of object type 26: LIFE-RAFT-NB-1 (Life-raft, no ballast (NB) system, general (mean values))
13:13:30 INFO opendrift.models.basemodel.environment:220: Adding a dynamical landmask with max. priority based on assumed maximum speed of 5.0 m/s. Adding a customised landmask may be faster...
13:13:36 INFO opendrift.models.basemodel:908: Using existing reader for land_binary_mask
13:13:36 INFO opendrift.models.basemodel:920: All points are in ocean
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/root/project/opendrift/readers/interpolation/interpolators.py:17: RuntimeWarning: overflow encountered in cast
data[mask] = np.finfo(np.float64).min
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13:13:40 WARNING opendrift.models.basemodel:2297: Missing variables: ['x_sea_water_velocity', 'y_sea_water_velocity']
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13:13:41 WARNING opendrift.models.basemodel:2378: 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 480.348x1100 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:
x_wind
wind_speed
y_wind
===========================
13:13:46 INFO opendrift.models.basemodel:529: OpenDriftSimulation initialised (version 1.11.2 / v1.11.2-11-g21e4c60)
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)
13:13:46 INFO opendrift.models.leeway:262: Seeding elements of object type 26: LIFE-RAFT-NB-1 (Life-raft, no ballast (NB) system, general (mean values))
13:13:46 INFO opendrift.models.basemodel.environment:220: Adding a dynamical landmask with max. priority based on assumed maximum speed of 5.0 m/s. Adding a customised landmask may be faster...
Running model
lw2.run(duration=timedelta(hours=48), time_step=900, time_step_output=3600)
13:13:46 INFO opendrift.models.basemodel:908: Using existing reader for land_binary_mask
13:13:46 INFO opendrift.models.basemodel:920: All points are in ocean
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/root/project/opendrift/readers/interpolation/interpolators.py:17: RuntimeWarning: overflow encountered in cast
data[mask] = np.finfo(np.float64).min
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13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 08:45:00 - step 132 of 192 - 26 active elements (974 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 09:00:00 - step 133 of 192 - 25 active elements (975 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 09:15:00 - step 134 of 192 - 24 active elements (976 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 09:30:00 - step 135 of 192 - 23 active elements (977 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 09:45:00 - step 136 of 192 - 23 active elements (977 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 10:00:00 - step 137 of 192 - 23 active elements (977 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 10:15:00 - step 138 of 192 - 22 active elements (978 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 10:30:00 - step 139 of 192 - 21 active elements (979 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 10:45:00 - step 140 of 192 - 20 active elements (980 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 11:00:00 - step 141 of 192 - 19 active elements (981 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 11:15:00 - step 142 of 192 - 17 active elements (983 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 11:30:00 - step 143 of 192 - 16 active elements (984 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 11:45:00 - step 144 of 192 - 16 active elements (984 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 12:00:00 - step 145 of 192 - 16 active elements (984 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 12:15:00 - step 146 of 192 - 16 active elements (984 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 12:30:00 - step 147 of 192 - 16 active elements (984 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 12:45:00 - step 148 of 192 - 16 active elements (984 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 13:00:00 - step 149 of 192 - 15 active elements (985 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 13:15:00 - step 150 of 192 - 15 active elements (985 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 13:30:00 - step 151 of 192 - 14 active elements (986 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 13:45:00 - step 152 of 192 - 14 active elements (986 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 14:00:00 - step 153 of 192 - 14 active elements (986 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 14:15:00 - step 154 of 192 - 14 active elements (986 deactivated)
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13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 15:15:00 - step 158 of 192 - 12 active elements (988 deactivated)
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13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 15:45:00 - step 160 of 192 - 10 active elements (990 deactivated)
13:13:49 INFO opendrift.models.basemodel:2011: 2015-11-17 16:00:00 - step 161 of 192 - 9 active elements (991 deactivated)
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13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 19:00:00 - step 173 of 192 - 7 active elements (993 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 19:15:00 - step 174 of 192 - 7 active elements (993 deactivated)
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13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 19:45:00 - step 176 of 192 - 7 active elements (993 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 20:00:00 - step 177 of 192 - 6 active elements (994 deactivated)
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13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 20:45:00 - step 180 of 192 - 5 active elements (995 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 21:00:00 - step 181 of 192 - 5 active elements (995 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 21:15:00 - step 182 of 192 - 5 active elements (995 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 21:30:00 - step 183 of 192 - 5 active elements (995 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 21:45:00 - step 184 of 192 - 5 active elements (995 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 22:00:00 - step 185 of 192 - 5 active elements (995 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 22:15:00 - step 186 of 192 - 5 active elements (995 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 22:30:00 - step 187 of 192 - 5 active elements (995 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 22:45:00 - step 188 of 192 - 4 active elements (996 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 23:00:00 - step 189 of 192 - 4 active elements (996 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 23:15:00 - step 190 of 192 - 4 active elements (996 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 23:30:00 - step 191 of 192 - 4 active elements (996 deactivated)
13:13:50 INFO opendrift.models.basemodel:2011: 2015-11-17 23:45:00 - step 192 of 192 - 4 active elements (996 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
0:00:02.8 total
0:00:00.0 preparing
0:00:00.4 reading
0:00:00.0 interpolation
0:00:00.0 interpolation_time
0:00:02.3 rotating vectors
0:00:00.0 masking
--------------------
/root/project/tests/test_data/16Nov2015_NorKyst_z_surface/norkyst800_subset_16Nov2015.nc
0:00:02.9 total
0:00:00.0 preparing
0:00:00.6 reading
0:00:00.2 interpolation
0:00:00.0 interpolation_time
0:00:02.3 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:
4.0 total time
0.1 configuration
0.0 preparing main loop
0.0 moving elements to ocean
3.9 main loop
0.1 updating elements
0.0 cleaning up
--------------------
===========================
Model: Leeway (OpenDrift version 1.11.2)
4 active LeewayObj particles (996 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
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
===========================
13:13:50 WARNING opendrift.models.basemodel:2378: 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 440.339x1100 with 1 Axes>)
The first simulation compared to the second with extra wind:
lw.plot(fast=True, compare=lw2)
13:13:55 WARNING opendrift.models.basemodel:2378: 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 484.222x1100 with 1 Axes>)
Total running time of the script: (0 minutes 33.642 seconds)