There was an issue with the unit testing, caused by a recent update to parcels. The testing data uses only 5 levels, down to 4.7m depth. Particles would cause an out of bounds error in such a case, and be deleted. Updating the density of the particles lets them still sink, but not as quickly as before.

michaeldenes · michaeldenes · commit e59fc0c4f9fd · 2024-12-04T16:34:19.000+01:00
diff --git a/tests/test_kernels.py b/tests/test_kernels.py
@@ -19,7 +19,7 @@ def make_standard_plastictype_settings():
     # Use tiny wind percentage because test data set is not large and wind speeds are quick!
     plastictype_settings = {'wind_coefficient': 0.0001,     # Percentage of wind to apply to particles
                             'plastic_diameter': 0.001,  # Plastic particle diameter (m)
-                            'plastic_density': 1030.,   # Plastic particle density (kg/m^3)
+                            'plastic_density': 1027.67,   # Plastic particle density (kg/m^3)
                             }
     return plastictype_settings
 

Original file line number	Diff line number	Diff line change
`@@ -19,7 +19,7 @@ def make_standard_plastictype_settings():`
`19`	`19`	`# Use tiny wind percentage because test data set is not large and wind speeds are quick!`
`20`	`20`	`plastictype_settings = {'wind_coefficient': 0.0001, # Percentage of wind to apply to particles`
`21`	`21`	`'plastic_diameter': 0.001, # Plastic particle diameter (m)`
`22`		`- 'plastic_density': 1030., # Plastic particle density (kg/m^3)`
	`22`	`+ 'plastic_density': 1027.67, # Plastic particle density (kg/m^3)`
`23`	`23`	`}`
`24`	`24`	`return plastictype_settings`
`25`	`25`