Note
Go to the end to download the full example code.
Using wind measurements
from datetime import datetime, timedelta, date
from opendrift.readers import reader_netCDF_CF_generic
from opendrift.models.openoil import OceanDrift
from opendrift.readers import reader_timeseries
from opendrift.readers.operators import ops
import opendrift.models.physics_methods as phy
import xarray as xr
import numpy as np
import pyproj
import matplotlib.pyplot as plt
import matplotlib as mpl
# Preparation of figsize, dpi, fontsize and font style
# Could also be done using mpl style sheet
# https://matplotlib.org/stable/users/explain/customizing.html
mpl.rcParams['figure.figsize'] = (5, 5)
mpl.rcParams['savefig.dpi'] = 300
mpl.rcParams['font.family'] = "sans-serif"
mpl.rcParams['font.sans-serif'] = "DejaVu Sans"
mpl.rcParams['font.size'] = 22
mpl.rcParams['mathtext.fontset'] = "dejavusans"
This example shows how to use wind or currents measurments combined with an ocean model to improove the drift calculation arround the measurment station.
Fisrt, we import two times the same model, because one will be used for the usual simulation, and one will be used for the measurement combined simulation.
reader_norkyst = reader_netCDF_CF_generic.Reader('https://thredds.met.no/thredds/dodsC/sea/norkyst800m/1h/aggregate_be')
reader_norkyst2 = reader_netCDF_CF_generic.Reader('https://thredds.met.no/thredds/dodsC/sea/norkyst800m/1h/aggregate_be')
#Verification
print(reader_norkyst)
===========================
Reader: https://thredds.met.no/thredds/dodsC/sea/norkyst800m/1h/aggregate_be
Projection:
+proj=stere +lat_0=90 +lat_ts=60 +lon_0=70 +x_0=3192800 +y_0=1784000 +a=6378137 +b=6356752.3142 +units=m +no_defs +type=crs
Coverage: [degrees]
xmin: 0.000000 xmax: 2080800.000000 step: 800 numx: 2602
ymin: 0.000000 ymax: 720800.000000 step: 800 numy: 902
Corners (lon, lat):
( -1.58, 58.50) ( 23.71, 75.32)
( 9.19, 55.91) ( 38.06, 70.03)
Vertical levels [m]:
[ -0. -3. -10. -15. -25. -50. -75. -100. -150. -200.
-250. -300. -500. -1000. -2000. -3000.]
Available time range:
start: 2017-02-20 00:00:00 end: 2024-12-17 00:00:00 step: 1:00:00
68569 times (3396 missing)
Variables:
sea_floor_depth_below_sea_level
latitude
longitude
x_wind
y_wind
sea_water_salinity
sea_water_temperature
x_sea_water_velocity
eastward_sea_water_velocity
y_sea_water_velocity
northward_sea_water_velocity
upward_sea_water_velocity
sea_surface_height
wind_speed - derived from ['x_wind', 'y_wind']
sea_water_speed - derived from ['x_sea_water_velocity', 'y_sea_water_velocity']
===========================
We then import wind measurement data, that will be stored in a timeserie reader. Don’t forget to give the lon and lat of the measurement station.
time_list = [datetime(2024, 5, 27, 6, 00, 00) + i*timedelta(minutes=10) for i in range(7)] # Manual import for this example
wind_speed_array = np.array([1.9, 3.0, 3.5, 3.4, 3.9, 2.8, 2.5])
wind_speed_angle = np.array([22, 25, 24, 19, 17, 30, 16])
# Alternative if data are in a csv file
# data_wind_bridge = np.genfromtxt("Simulation_data/data_wind_21_mai_2024.txt", dtype = '<U10', skip_header=1)
# temporal_time = np.array([data_wind_bridge[i, 0] + "T" + data_wind_bridge[i, 1] for i in range(len(data_wind_bridge))])
# time_list = [datetime.fromisoformat(temporal_time[i]) for i in range(len(temporal_time))]
# wind_speed_array = data_wind_bridge[:, 3]
# wind_speed_angle = data_wind_bridge[:, 5]
# wind_speed_array = wind_speed_array.astype(float)
# wind_speed_angle = wind_speed_angle.astype(float)
#Calculation of wind_x and wind_y
wind_speed_angle = np.deg2rad(wind_speed_angle)
wind_x = wind_speed_array * np.cos(wind_speed_angle)
wind_y = wind_speed_array * np.sin(wind_speed_angle)
#Creation of the wind measurement reader
lon, lat = 5.17, 60.37
parameter_value_map = {'time': time_list, 'wind_speed': wind_speed_array, 'x_wind': wind_x, 'y_wind': wind_y, 'lon':lon, 'lat':lat}
wind_obs_reader = reader_timeseries.Reader(parameter_value_map)
#Preparing future plots
text = [{'s': '* Station', 'x': lon, 'y': lat, 'fontsize': 20, 'color': 'k', 'backgroundcolor': 'white', 'bbox': dict(facecolor='none', edgecolor='none', alpha=0.4), 'zorder': 1000}]
#Verification
print(wind_obs_reader)
===========================
Reader: reader_timeseries
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: 2024-05-27 06:00:00 end: 2024-05-27 07:00:00 step: 0:10:00
7 times (0 missing)
Variables:
wind_speed
x_wind
y_wind
lon
lat
===========================
Now we combine the second norkyst reader with the measurement one, using a gaussian combined reader.
c = reader_norkyst2.combine_gaussian(wind_obs_reader, std = 1000)
print(c)
===========================
Reader: Combined(https://thredds.met.no/thredds/dodsC/sea/norkyst800m/1h/aggregate_be | reader_timeseries)
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: 2024-05-27 06:00:00 end: 2024-05-27 07:00:00 step: None
Variables:
wind_speed
y_wind
x_wind
===========================
Configuration of the simulations
time_start = datetime(2024, 5, 27, 6, 00, 00)
time_end = time_start + timedelta(hours = 2)
time = [time_start, time_end]
time_step = 150
time_step_output = 150
# Seeding configuration
lon = 5.187
lat = 60.385
radius = 0
number = 1
wind_drift_factor = 0.03
Usual simulation
o = OceanDrift(loglevel=20)
o.add_reader([reader_norkyst])
# o.set_config('drift:current_uncertainty', .1)
# o.set_config('drift:wind_uncertainty', 1)
o.seed_elements(lon=lon, lat=lat, radius=radius, number=number, time=time_start, wind_drift_factor=wind_drift_factor)
o.run(end_time=time_end, time_step=time_step, time_step_output=time_step_output)
o.plot(fast = False, background=['x_sea_water_velocity', 'y_sea_water_velocity'], legend=['Norkyst only', 'Gaussian measurement'], buffer = .023, markersize = 150, linewidth = 3, title = "", xlocs = mpl.ticker.MaxNLocator(5), ylocs = mpl.ticker.MaxNLocator(5), clabel = r"Wind speed $\mathrm{(m.s^{-1})}$", cpad = 0.08, text=text)
20:12:02 INFO opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)
20:12:02 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...
20:12:05 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:12:05 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_to_direction: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_significant_height: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_to_direction: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_mean_period: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_significant_height: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: surface_downward_x_stress: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: surface_downward_y_stress: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: turbulent_kinetic_energy: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: turbulent_generic_length_scale: 0.000000
20:12:05 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
20:12:06 INFO opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:12:06 INFO opendrift.models.basemodel:946: All points are in ocean
20:12:06 WARNING opendrift.models.basemodel:729: Seafloor check not being run because environment is missing. This will happen the first time the function is run but if it happens subsequently there is probably a problem.
20:12:06 INFO opendrift.models.basemodel:2035: 2024-05-27 06:00:00 - step 1 of 48 - 1 active elements (0 deactivated)
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(<GeoAxes: >, <Figure size 1100x975.726 with 2 Axes>)
Measurement modified model simulation and comparison
o2 = OceanDrift(loglevel=20)
o2.set_config('drift:max_speed', 10) #Necessary for the moment because of a bug to be solved
o2.add_reader([c, reader_norkyst])
#o2.set_config('drift:current_uncertainty', .1)
#o2.set_config('drift:wind_uncertainty', 1)
o2.seed_elements(lon=lon, lat=lat, radius=radius, number=number, time=time_start, wind_drift_factor=wind_drift_factor)
o2.run(end_time=time_end, time_step=time_step, time_step_output=time_step_output)
o.plot(fast = False, compare=o2, background=['x_sea_water_velocity', 'y_sea_water_velocity'], legend=['Norkyst only', 'Gaussian measurement'], buffer = .023, markersize = 150, linewidth = 3, title = "", xlocs = mpl.ticker.MaxNLocator(5), ylocs = mpl.ticker.MaxNLocator(5), clabel = r"Wind speed $\mathrm{(m.s^{-1})}$", cpad = 0.08, text=text)
20:14:00 INFO opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)
20:14:00 INFO opendrift.models.basemodel.environment:218: Adding a dynamical landmask with max. priority based on assumed maximum speed of 10.0 m/s. Adding a customised landmask may be faster...
20:14:00 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:14:00 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_to_direction: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_significant_height: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_to_direction: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_mean_period: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_significant_height: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: surface_downward_x_stress: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: surface_downward_y_stress: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: turbulent_kinetic_energy: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: turbulent_generic_length_scale: 0.000000
20:14:00 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
20:14:00 INFO opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:14:00 INFO opendrift.models.basemodel:946: All points are in ocean
20:14:00 WARNING opendrift.models.basemodel:729: Seafloor check not being run because environment is missing. This will happen the first time the function is run but if it happens subsequently there is probably a problem.
20:14:00 INFO opendrift.models.basemodel:2035: 2024-05-27 06:00:00 - step 1 of 48 - 1 active elements (0 deactivated)
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(<GeoAxes: >, <Figure size 1100x965.822 with 2 Axes>)
Here, we generate more particles and look at the skillscore impact of the measurment combined simulation
radius = 100
number = 100
o = OceanDrift(loglevel=20)
o.add_reader([reader_norkyst])
o.seed_elements(lon=lon, lat=lat, radius=radius, number=number, time=time_start, wind_drift_factor=wind_drift_factor)
o.run(end_time=time_end, time_step=time_step, time_step_output=time_step_output)
o2 = OceanDrift(loglevel=20)
o2.set_config('drift:max_speed', 10) #Necessary for the moment because of a bug to be solved
o2.add_reader([c, reader_norkyst])
o2.seed_elements(lon=lon, lat=lat, radius=radius, number=number, time=time_start, wind_drift_factor=wind_drift_factor)
o2.run(end_time=time_end, time_step=time_step, time_step_output=time_step_output)
o.plot(fast = False, compare=o2, background=['x_sea_water_velocity', 'y_sea_water_velocity'], legend=['Norkyst only', 'Gaussian measurement'], buffer = .023, markersize = 70, linewidth = 1, title = "", xlocs = mpl.ticker.MaxNLocator(5), ylocs = mpl.ticker.MaxNLocator(5), clabel = r"Wind speed $\mathrm{(m.s^{-1})}$", cpad = 0.08, text=text)
lon_drifters_1, lat_drifters_1 = o.get_lonlats()
lon_drifters_2, lat_drifters_2 = o2.get_lonlats()
skillscores = phy.skillscore_liu_weissberg(lon_drifters_1, lat_drifters_1, lon_drifters_2, lat_drifters_2)
plt.figure()
plt.hist(skillscores, bins = 100, range = (0, 1), facecolor = 'none', edgecolor = 'C0')
plt.xlabel("Skillscore")
plt.ylabel("Histogram (percentages)")
plt.show()
plt.figure()
plt.hist(skillscores, bins = 100, range = (0.9, 0.95), facecolor = 'none', edgecolor = 'C0')
plt.xlabel("Skillscore")
plt.ylabel("Histogram (percentages)")
plt.show()
20:14:23 INFO opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)
20:14:23 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...
20:14:23 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:14:23 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_to_direction: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_significant_height: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_to_direction: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_mean_period: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_significant_height: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: surface_downward_x_stress: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: surface_downward_y_stress: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: turbulent_kinetic_energy: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: turbulent_generic_length_scale: 0.000000
20:14:23 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
20:14:23 INFO opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:14:24 INFO opendrift.models.basemodel:946: All points are in ocean
20:14:24 WARNING opendrift.models.basemodel:729: Seafloor check not being run because environment is missing. This will happen the first time the function is run but if it happens subsequently there is probably a problem.
20:14:24 INFO opendrift.models.basemodel:2035: 2024-05-27 06:00:00 - step 1 of 48 - 100 active elements (0 deactivated)
20:14:25 INFO opendrift.models.basemodel:2035: 2024-05-27 06:02:30 - step 2 of 48 - 100 active elements (0 deactivated)
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20:14:28 INFO opendrift.models.basemodel:2035: 2024-05-27 07:40:00 - step 41 of 48 - 100 active elements (0 deactivated)
20:14:28 INFO opendrift.models.basemodel:2035: 2024-05-27 07:42:30 - step 42 of 48 - 100 active elements (0 deactivated)
20:14:29 INFO opendrift.models.basemodel:2035: 2024-05-27 07:45:00 - step 43 of 48 - 100 active elements (0 deactivated)
20:14:29 INFO opendrift.models.basemodel:2035: 2024-05-27 07:47:30 - step 44 of 48 - 100 active elements (0 deactivated)
20:14:29 INFO opendrift.models.basemodel:2035: 2024-05-27 07:50:00 - step 45 of 48 - 100 active elements (0 deactivated)
20:14:29 INFO opendrift.models.basemodel:2035: 2024-05-27 07:52:30 - step 46 of 48 - 100 active elements (0 deactivated)
20:14:29 INFO opendrift.models.basemodel:2035: 2024-05-27 07:55:00 - step 47 of 48 - 100 active elements (0 deactivated)
20:14:29 INFO opendrift.models.basemodel:2035: 2024-05-27 07:57:30 - step 48 of 48 - 100 active elements (0 deactivated)
20:14:29 INFO opendrift.models.basemodel:515: OpenDriftSimulation initialised (version 1.12.0 / v1.12.0-26-g390e945)
20:14:29 INFO opendrift.models.basemodel.environment:218: Adding a dynamical landmask with max. priority based on assumed maximum speed of 10.0 m/s. Adding a customised landmask may be faster...
20:14:29 INFO opendrift.models.basemodel.environment:245: Fallback values will be used for the following variables which have no readers:
20:14:29 INFO opendrift.models.basemodel.environment:248: ocean_vertical_diffusivity: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_significant_height: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_x_velocity: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_stokes_drift_y_velocity: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_period_at_variance_spectral_density_maximum: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_wave_mean_period_from_variance_spectral_density_second_frequency_moment: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_to_direction: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_peak_period_from_variance_spectral_density: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_swell_wave_significant_height: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_to_direction: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_mean_period: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: sea_surface_wind_wave_significant_height: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: surface_downward_x_stress: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: surface_downward_y_stress: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: turbulent_kinetic_energy: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: turbulent_generic_length_scale: 0.000000
20:14:29 INFO opendrift.models.basemodel.environment:248: ocean_mixed_layer_thickness: 50.000000
20:14:29 INFO opendrift.models.basemodel:935: Using existing reader for land_binary_mask
20:14:29 INFO opendrift.models.basemodel:946: All points are in ocean
20:14:29 WARNING opendrift.models.basemodel:729: Seafloor check not being run because environment is missing. This will happen the first time the function is run but if it happens subsequently there is probably a problem.
20:14:29 INFO opendrift.models.basemodel:2035: 2024-05-27 06:00:00 - step 1 of 48 - 100 active elements (0 deactivated)
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Total running time of the script: (3 minutes 0.959 seconds)