Note
Go to the end to download the full example code.
FVCOM: Using model input from unstructured grid
from datetime import timedelta
import urllib.request as urllib_request
import numpy as np
from opendrift.readers import reader_netCDF_CF_unstructured
from opendrift.readers import reader_global_landmask
from opendrift.models.oceandrift import OceanDrift
o = OceanDrift(loglevel=20) # Set loglevel to 0 for debug information
try:
proj = "+proj=utm +zone=33 +north +ellps=WGS84 +datum=WGS84 +units=m +no_defs"
fvcom = reader_netCDF_CF_unstructured.Reader(filename = 'https://thredds.met.no/thredds/dodsC/metusers/knutfd/thredds/netcdf_unstructured_samples/AkvaplanNiva_sample_lonlat_fixed.nc', proj4 = proj)
o.add_reader(fvcom)
print(fvcom)
except:
print('Thredds server not available, cannot run example')
fvcom = None
if fvcom is not None:
# Seed elements at defined positions, depth and time
N = 1000
z = -10*np.random.uniform(0, 1, N)
o.seed_elements(lon=18.0, lat=69.8, radius=2000, number=N,
z=z, time=fvcom.start_time)
#%%
# Running model
o.run(time_step=1800, duration=timedelta(hours=12))
#%%
# Print and plot results
print(o)
#%%
# Animation (current as background not yet working).
o.animation(color='z')
o.plot(fast=True, buffer = 1.)

17:14:13 INFO opendrift:513: OpenDriftSimulation initialised (version 1.14.2 / v1.14.2-88-gf09b7bd)
17:14:13 INFO opendrift.readers.reader_netCDF_CF_unstructured:98: Opening dataset: https://thredds.met.no/thredds/dodsC/metusers/knutfd/thredds/netcdf_unstructured_samples/AkvaplanNiva_sample_lonlat_fixed.nc
17:14:13 INFO opendrift.readers.reader_netCDF_CF_unstructured:103: Opening file with Dataset
17:14:14 INFO opendrift.readers.reader_netCDF_CF_unstructured:107: Using custom projection: +proj=utm +zone=33 +north +ellps=WGS84 +datum=WGS84 +units=m +no_defs..
17:14:14 INFO opendrift.readers.reader_netCDF_CF_unstructured:117: Reading grid and coordinate variables..
===========================
Reader: https://thredds.met.no/thredds/dodsC/metusers/knutfd/thredds/netcdf_unstructured_samples/AkvaplanNiva_sample_lonlat_fixed.nc
Projection:
+proj=utm +zone=33 +north +ellps=WGS84 +datum=WGS84 +units=m +no_defs
Coverage: [degrees]
xmin: 523286.781250 xmax: 724075.187500
ymin: 7685101.000000 ymax: 7873698.000000
Corners (lon, lat):
( 15.64, 70.97) ( 21.13, 70.87)
( 15.59, 69.27) ( 20.66, 69.18)
Vertical levels [m]:
Not specified
Available time range:
start: 2018-04-30 01:01:52 end: 2018-05-01 00:00:00 step: None
Variables:
sea_floor_depth_below_geoid
sea_surface_height_above_geoid
x_sea_water_velocity
y_sea_water_velocity
sea_water_temperature
sea_water_salinity
sea_water_speed - derived from ['x_sea_water_velocity', 'y_sea_water_velocity']
===========================
0:00:02.6 open dataset
0:00:00.1 build index
17:14:16 INFO opendrift.models.basemodel.environment:206: Adding a global landmask from GSHHG
17:14:20 INFO opendrift.models.basemodel.environment:229: Fallback values will be used for the following variables which have no readers:
17:14:20 INFO opendrift.models.basemodel.environment:232: sea_surface_height: 0.000000
17:14:20 INFO opendrift.models.basemodel.environment:232: x_wind: 0.000000
17:14:20 INFO opendrift.models.basemodel.environment:232: y_wind: 0.000000
17:14:20 INFO opendrift.models.basemodel.environment:232: upward_sea_water_velocity: 0.000000
17:14:20 INFO opendrift.models.basemodel.environment:232: ocean_vertical_diffusivity: 0.000000
17:14:20 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_significant_height: 0.000000
17:14:20 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_stokes_drift_x_velocity: 0.000000
17:14:20 INFO opendrift.models.basemodel.environment:232: sea_surface_wave_stokes_drift_y_velocity: 0.000000
17:14:20 INFO opendrift.models.basemodel.environment:232: ocean_mixed_layer_thickness: 50.000000
17:14:20 INFO opendrift.models.basemodel.environment:232: sea_floor_depth_below_sea_level: 10000.000000
17:14:20 INFO opendrift:1732: Skipping environment variable ocean_vertical_diffusivity because of condition ['drift:vertical_mixing', 'is', False]
17:14:20 INFO opendrift:1732: Skipping environment variable ocean_mixed_layer_thickness because of condition ['drift:vertical_mixing', 'is', False]
17:14:20 INFO opendrift:1743: Storing previous values of element property lon because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
17:14:20 INFO opendrift:1743: Storing previous values of element property lat because of condition (('general:coastline_action', 'in', ['stranding', 'previous']), 'or', ('general:seafloor_action', 'in', ['previous']))
17:14:20 INFO opendrift:1751: Storing previous values of environment variable sea_surface_height because of condition ['drift:vertical_advection', 'is', True]
17:14:20 INFO opendrift:899: Using existing reader for land_binary_mask
17:14:22 INFO opendrift:930: Moving 2 out of 1000 points from land to water
17:14:22 INFO opendrift:2035: 2018-04-30 01:01:52 - step 1 of 24 - 1000 active elements (0 deactivated)
17:14:22 INFO opendrift.readers.reader_netCDF_CF_unstructured:388: Reading siglay_centers into memory...
17:14:24 INFO opendrift.readers.reader_netCDF_CF_unstructured:392: Reading siglev_centers into memory...
17:14:27 INFO opendrift.readers.reader_netCDF_CF_unstructured:401: Reading ocean depth center into memory...
17:14:29 INFO opendrift:2035: 2018-04-30 01:31:52 - step 2 of 24 - 1000 active elements (0 deactivated)
17:14:32 INFO opendrift:2035: 2018-04-30 02:01:52 - step 3 of 24 - 998 active elements (2 deactivated)
17:14:34 INFO opendrift:2035: 2018-04-30 02:31:52 - step 4 of 24 - 998 active elements (2 deactivated)
17:14:35 INFO opendrift:2035: 2018-04-30 03:01:52 - step 5 of 24 - 998 active elements (2 deactivated)
17:14:37 INFO opendrift:2035: 2018-04-30 03:31:52 - step 6 of 24 - 998 active elements (2 deactivated)
17:14:39 INFO opendrift:2035: 2018-04-30 04:01:52 - step 7 of 24 - 998 active elements (2 deactivated)
17:14:40 INFO opendrift:2035: 2018-04-30 04:31:52 - step 8 of 24 - 997 active elements (3 deactivated)
17:14:41 INFO opendrift:2035: 2018-04-30 05:01:52 - step 9 of 24 - 997 active elements (3 deactivated)
17:14:42 INFO opendrift:2035: 2018-04-30 05:31:52 - step 10 of 24 - 997 active elements (3 deactivated)
17:14:44 INFO opendrift:2035: 2018-04-30 06:01:52 - step 11 of 24 - 997 active elements (3 deactivated)
17:14:45 INFO opendrift:2035: 2018-04-30 06:31:52 - step 12 of 24 - 997 active elements (3 deactivated)
17:14:48 INFO opendrift:2035: 2018-04-30 07:01:52 - step 13 of 24 - 997 active elements (3 deactivated)
17:14:49 INFO opendrift:2035: 2018-04-30 07:31:52 - step 14 of 24 - 997 active elements (3 deactivated)
17:14:50 INFO opendrift:2035: 2018-04-30 08:01:52 - step 15 of 24 - 997 active elements (3 deactivated)
17:14:51 INFO opendrift:2035: 2018-04-30 08:31:52 - step 16 of 24 - 997 active elements (3 deactivated)
17:14:53 INFO opendrift:2035: 2018-04-30 09:01:52 - step 17 of 24 - 997 active elements (3 deactivated)
17:14:54 INFO opendrift:2035: 2018-04-30 09:31:52 - step 18 of 24 - 993 active elements (7 deactivated)
17:14:56 INFO opendrift:2035: 2018-04-30 10:01:52 - step 19 of 24 - 991 active elements (9 deactivated)
17:14:57 INFO opendrift:2035: 2018-04-30 10:31:52 - step 20 of 24 - 989 active elements (11 deactivated)
17:14:59 INFO opendrift:2035: 2018-04-30 11:01:52 - step 21 of 24 - 988 active elements (12 deactivated)
17:15:00 INFO opendrift:2035: 2018-04-30 11:31:52 - step 22 of 24 - 988 active elements (12 deactivated)
17:15:02 INFO opendrift:2035: 2018-04-30 12:01:52 - step 23 of 24 - 988 active elements (12 deactivated)
17:15:03 INFO opendrift:2035: 2018-04-30 12:31:52 - step 24 of 24 - 988 active elements (12 deactivated)
===========================
--------------------
Reader performance:
--------------------
https://thredds.met.no/thredds/dodsC/metusers/knutfd/thredds/netcdf_unstructured_samples/AkvaplanNiva_sample_lonlat_fixed.nc
0:00:02.6 open dataset
0:00:00.1 build index
0:00:41.1 total
0:00:00.0 preparing
0:00:41.0 reading
0:00:00.0 rotating vectors
0:00:00.0 masking
--------------------
global_landmask
0:00:01.5 total
0:00:00.0 preparing
0:00:01.5 reading
0:00:00.0 masking
--------------------
Performance:
51.8 total time
6.9 configuration
1.6 preparing main loop
1.5 moving elements to ocean
43.2 main loop
0.0 updating elements
0.0 cleaning up
--------------------
===========================
Model: OceanDrift (OpenDrift version 1.14.2)
983 active Lagrangian3DArray particles (17 deactivated, 0 scheduled)
-------------------
Environment variables:
-----
x_sea_water_velocity
y_sea_water_velocity
1) https://thredds.met.no/thredds/dodsC/metusers/knutfd/thredds/netcdf_unstructured_samples/AkvaplanNiva_sample_lonlat_fixed.nc
-----
land_binary_mask
1) global_landmask
-----
Readers not added for the following variables:
sea_floor_depth_below_sea_level
sea_surface_height
sea_surface_wave_significant_height
sea_surface_wave_stokes_drift_x_velocity
sea_surface_wave_stokes_drift_y_velocity
upward_sea_water_velocity
x_wind
y_wind
Discarded readers:
Time:
Start: 2018-04-30 01:01:52 UTC
Present: 2018-04-30 13:01:52 UTC
Calculation steps: 24 * 0:30:00 - total time: 12:00:00
Output steps: 25 * 0:30:00
===========================
17:15:15 INFO opendrift:4553: Saving animation to /root/project/docs/source/gallery/animations/example_fvcom_0.gif...
17:15:30 INFO opendrift:2994: Time to make animation: 0:00:25.356865
17:15:30 WARNING opendrift:2391: Plotting fast. This will make your plots less accurate.

Total running time of the script: (1 minutes 26.121 seconds)