# -*- coding: utf-8 -*-
"""
.. _`Wikipedia page on latent heat`: https://en.wikipedia.org/wiki/Latent_heat
"""
# import...
# ...from HydPy
from hydpy.core import parametertools
[docs]
class CPWasser(parametertools.FixedParameter):
"""Spezifische Wärmekapazität von Wasser (specific heat capacity of water)
[WT/kg/K]."""
NDIM, TYPE, TIME, SPAN = 0, float, False, (0.0, None)
INIT = 0.04845833333333333
[docs]
class CPEis(parametertools.FixedParameter):
"""Spezifische Wärmekapazität von Eis bei 0 °C (specific heat capacity of ice at a
temperature of 0 °C) [WT/kg/K]."""
NDIM, TYPE, TIME, SPAN = 0, float, False, (0.0, None)
INIT = 0.024189814814814813
[docs]
class RSchmelz(parametertools.FixedParameter):
"""Spezifische Schmelzwärme von Wasser (specific melt heat of water) [WT/kg]."""
NDIM, TYPE, TIME, SPAN = 0, float, False, (0.0, None)
INIT = 3.865740740740741
[docs]
class Pi(parametertools.FixedParameter):
"""π [-]."""
NDIM, TYPE, TIME, SPAN = 0, float, None, (0.0, None)
INIT = 3.141592653589793
[docs]
class Z(parametertools.FixedParameter):
"""Halbe Mächtigkeit der in der Temperaturmodellierung betrachteten Bodensäule (the
half thickness of the surface soil layer relevant for modelling soil temperature)
[m]."""
NDIM, TYPE, TIME, SPAN = 0, float, None, (0.0, None)
INIT = 0.1
[docs]
class BoWa2Z(parametertools.FixedParameter):
"""Bodenwassergehalt der Bodenschicht bis zu einer Tiefe 2z (soil water content of
the soil layer down two a depth of 2z) [mm]."""
NDIM, TYPE, TIME, SPAN = 1, float, None, (0, None)
INIT = 80.0
[docs]
class LambdaG(parametertools.FixedParameter):
"""Wärmeleitfähigkeit des Bodens (thermal conductivity of the top soil layer)
[W/m/K]."""
NDIM, TYPE, TIME, SPAN = 0, float, None, (0.0, None)
INIT = 0.6
[docs]
class Sigma(parametertools.FixedParameter):
"""Stefan-Boltzmann-Konstante (Stefan-Boltzmann constant) [W/m²/K]."""
NDIM, TYPE, TIME, SPAN = 0, float, None, (0.0, None)
INIT = 5.67e-08
[docs]
class LWE(parametertools.FixedParameter):
"""Mittlere latente Verdunstungswärme für Wasser und Eis (average heat of
condensation for water and ice) [WT/kg].
Following the equations given on the `Wikipedia page on latent heat`_, we calculate
the latent heat of water and the latent heat of sublimation both at a temperature
of 0°C...
>>> from hydpy import round_
>>> t = 0.0
>>> round_((2500.8-2.36*t+0.0016*t**2-0.00006*t**3)*1000/60/60/24)
28.944444
>>> round_((2834.1-0.29*t-0.004*t**2)*1000/60/60/24)
32.802083
... and use their average as the default value for parameter |LWE|:
>>> round_((28.944444+32.802083)/2)
30.873264
>>> from hydpy.models.lland.lland_fixed import LWE
>>> round_(LWE.INIT)
30.873264
"""
NDIM, TYPE, TIME, SPAN = 0, float, False, (0.0, None)
INIT = 30.87326388888889
[docs]
class PsyInv(parametertools.FixedParameter):
"""Kehrwert der Psychrometerkonstante über Schnee und Eis bei 0°C (inverse
psychrometric constant for ice and snow at 0°C) [K/hPa]."""
NDIM, TYPE, TIME, SPAN = 0, float, None, (0.0, None)
INIT = 1.76
[docs]
class Z0(parametertools.FixedParameter):
"""Rauhigkeitslänge für Wiese (roughness length for short grass) [m]."""
NDIM, TYPE, TIME, SPAN = 0, float, None, (0.0, None)
INIT = 0.003
[docs]
class FrAtm(parametertools.FixedParameter):
"""Empirischer Faktor zur Berechnung der atmosphärischen Gegenstrahlung (empirical
factor for the calculation of atmospheric radiation) [-]"""
NDIM, TYPE, TIME, SPAN = 0, float, None, (0.0, None)
INIT = 1.28
[docs]
class CG(parametertools.FixedParameter):
"""Volumetrische Wärmekapazität des Bodens (volumetric heat capacity of soil)
[WT/m³/K]."""
NDIM, TYPE, TIME, SPAN = 0, float, False, (None, None)
INIT = 17.36111111111111
