RUFAS.general_constants module

class RUFAS.general_constants.GeneralConstants

Bases: object

Contains general constants used in RuFaS.

Attributes:

MM_TO_M: The conversion factor from millimeters to meters. CM_TO_MM: The conversion factor from centimeters to millimeters. MM_TO_CM: The conversion factor from millimeters to centimeters.

GRAMS_TO_KG: The conversion factor from grams to kilograms. LITERS_TO_CUBIC_METERS: The conversion factor from liters to cubic meters. KG_TO_CUBIC_METERS: The conversion factor from kilograms to cubic meters.

DAYS_PER_YEAR: The number of days in a year. SECONDS_PER_DAY: The number of seconds in a day. HOURS_PER_DAY: The number of hours in a day.

WATER_DENSITY_KG_PER_LITER: The density of water in kilograms per liter. WATER_DENSITY_KG_PER_M3: The density of water in kilograms per cubic meter.

PROTEIN_TO_NITROGEN: The nitrogen content of proteins is assumed to be 16%. MILK_FAT_WEIGHT: The weight of milk fat.

EARTH_ANGULAR_VELOCITY: Earth’s angular velocity.

CELSIUS_TO_KELVIN: The constant for converting temperatures from Celsius to Kelvin.

PERCENTAGE_TO_FRACTION: The conversion factor from a percentage to a fraction. FRACTION_TO_PERCENTAGE: The conversion factor from a fraction to a percentage.

BYTES_PER_GB = 1073741824

MM_TO_M = 0.001

CM_TO_MM = 10.0

MM_TO_CM = 0.1

M_TO_KM = 0.001

KM_TO_M = 1000

GRAMS_TO_KG = 0.001

KG_TO_GRAMS = 1000

KG_TO_MILLIGRAMS = 1000000

MILLIGRAMS_TO_KG = 1e-06

MEGAGRAMS_TO_KILOGRAMS = 1000

KILOGRAMS_TO_MEGAGRAMS = 0.001

LITERS_TO_CUBIC_METERS = 0.001

CUBIC_METERS_TO_LITERS = 1000

KG_TO_CUBIC_METERS = 0.001

LITERS_TO_CUBIC_MILLIMETERS = 1000000

CUBIC_MILLIMETERS_TO_LITERS = 1e-06

CUBIC_METERS_TO_CUBIC_MILLIMETERS = 1000000000

CUBIC_MILLIMETERS_TO_CUBIC_METERS = 1e-09

YEAR_LENGTH = 365

LEAP_YEAR_LENGTH = 366

SECONDS_PER_DAY = 86400

HOURS_PER_DAY = 24

WATER_DENSITY_KG_PER_LITER = 0.997

WATER_DENSITY_KG_PER_M3 = 0.000997

PROTEIN_TO_NITROGEN = 0.16

NITROGEN_TO_PROTEIN = 6.25

MILK_FAT_WEIGHT = 12.2

FRACTION_OF_HUMIC_NITROGEN_IN_ACTIVE_POOL = 0.02

Defined in SWAT Theoretical documentation, page 186 in paragraph beneath eqn. 3:1.1.4.

KCAL_TO_MJ = 4.184

MJ_CH4_TO_G_CH4 = 0.05565

EARTH_ANGULAR_VELOCITY = 0.2618

CELSIUS_TO_KELVIN = 273.15

PERCENTAGE_TO_FRACTION = 0.01

FRACTION_TO_PERCENTAGE = 100.0

HECTARES_TO_SQUARE_CENTIMETERS = 100000000

SQUARE_CENTIMETERS_TO_HECTARES = 1e-08

HECTARES_TO_SQUARE_MILLIMETERS = 10000000000

SQUARE_MILLIMETERS_TO_HECTARES = 1e-10

SQUARE_KILOMETERS_TO_HECTARES = 100

HECTARES_TO_SQUARE_KILOMETERS = 0.01

HECTARES_PER_SQUARE_METER = 10000

SQUARE_METERS_TO_HECTARES = 0.0001

AMBIENT_AIR_MOLE_FRACTION_OF_OXYGEN: float = 0.21

The mole fraction of oxygen in ambient air.

METHANE_FACTOR: float = 0.67

Unit conversion factor for methane from \(m^3\) to kg at 20 degrees C (kg/m3).

GAS_CONSTANT: float = 8.314

The ideal gas constant (J/mol * K).

GENERAL_LOWER_BOUND_TEMPERATURE: float = -40.0

General temperature lower bound (degrees C).

GENERAL_UPPER_BOUND_TEMPERATURE: float = 60.0

General temperature upper bound (degrees C).

IDEAL_GAS_LAW_R = 0.0821

Value of R in the ideal gas law (L·atm/(mol·K).

CONSTANTS_TO_UNITS = {'BYTES_PER_GB': MeasurementUnits.BYTES, 'CELSIUS_TO_KELVIN': MeasurementUnits.DEGREES_CELSIUS, 'CM_TO_MM': MeasurementUnits.MILLIMETERS_PER_CENTIMETER, 'CUBIC_METERS_TO_CUBIC_MILLIMETERS': MeasurementUnits.CUBIC_MILLIMETERS_PER_CUBIC_METER, 'CUBIC_METERS_TO_LITERS': MeasurementUnits.LITERS_PER_CUBIC_METER, 'CUBIC_MILLIMETERS_TO_CUBIC_METERS': MeasurementUnits.CUBIC_METERS_PER_CUBIC_MILLIMETER, 'EARTH_ANGULAR_VELOCITY': MeasurementUnits.RADIANS_PER_HOUR, 'FRACTION_OF_HUMIC_NITROGEN_IN_ACTIVE_POOL': MeasurementUnits.UNITLESS, 'FRACTION_TO_PERCENTAGE': MeasurementUnits.UNITLESS, 'GRAMS_TO_KG': MeasurementUnits.KILOGRAMS_PER_GRAM, 'HECTARES_PER_SQUARE_METER': MeasurementUnits.HECTARES_PER_SQUARE_METER, 'HECTARES_TO_SQUARE_CENTIMETERS': MeasurementUnits.SQUARE_CENTIMETERS_PER_HECTARE, 'HECTARES_TO_SQUARE_KILOMETERS': MeasurementUnits.SQUARE_KILOMETERS_PER_HECTARE, 'HECTARES_TO_SQUARE_MILLIMETERS': MeasurementUnits.SQUARE_MILLIMETERS_PER_HECTARE, 'HOURS_PER_DAY': MeasurementUnits.HOURS_PER_DAY, 'KCAL_TO_MJ': MeasurementUnits.MCAL_PER_MJ, 'KG_TO_CUBIC_METERS': MeasurementUnits.CUBIC_METERS_PER_KILOGRAM, 'KG_TO_GRAMS': MeasurementUnits.GRAMS_PER_KILOGRAM, 'KILOGRAMS_TO_MEGAGRAMS': MeasurementUnits.MEGAGRAMS_PER_KILOGRAM, 'KM_TO_M': MeasurementUnits.METERS_PER_KILOMETER, 'LEAP_YEAR_LENGTH': MeasurementUnits.DAYS_PER_LEAP_YEAR, 'LITERS_TO_CUBIC_METERS': MeasurementUnits.CUBIC_METERS_PER_LITER, 'MEGAGRAMS_TO_KILOGRAMS': MeasurementUnits.KILOGRAMS_PER_MEGAGRAM, 'MILK_FAT_WEIGHT': MeasurementUnits.UNITLESS, 'MILLIGRAMS_TO_KG': MeasurementUnits.KILOGRAMS_PER_MILLIGRAM, 'MJ_CH4_TO_G_CH4': MeasurementUnits.MJ_CH4_PER_G_CH4, 'MM_TO_CM': MeasurementUnits.CENTIMETERS_PER_MILLIMETER, 'MM_TO_M': MeasurementUnits.METERS_PER_MILLIMETER, 'M_TO_KM': MeasurementUnits.KILOMETERS_PER_METER, 'NITROGEN_TO_PROTEIN': MeasurementUnits.UNITLESS, 'PERCENTAGE_TO_FRACTION': MeasurementUnits.UNITLESS, 'PROTEIN_TO_NITROGEN': MeasurementUnits.UNITLESS, 'SECONDS_PER_DAY': MeasurementUnits.SECONDS_PER_DAY, 'SQUARE_CENTIMETERS_TO_HECTARES': MeasurementUnits.HECTARES_PER_SQUARE_CENTIMETER, 'SQUARE_KILOMETERS_TO_HECTARES': MeasurementUnits.HECTARES_PER_SQUARE_KILOMETER, 'SQUARE_METERS_TO_HECTARES': MeasurementUnits.SQUARE_METERS_PER_HECTARE, 'SQUARE_MILLIMETERS_TO_HECTARES': MeasurementUnits.HECTARES_PER_SQUARE_MILLIMETER, 'WATER_DENSITY_KG_PER_LITER': MeasurementUnits.KILOGRAMS_PER_LITER, 'WATER_DENSITY_KG_PER_M3': MeasurementUnits.KILOGRAMS_PER_CUBIC_METER, 'YEAR_LENGTH': MeasurementUnits.DAYS_PER_YEAR}