Difference between revisions of "Module Basin"
From MohidWiki
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* Reading entering data and grid construction | * Reading entering data and grid construction | ||
| − | * Atmospheric processes in order to obtain the water column from the precipitation | + | * Atmospheric processes in order to obtain the water column from the precipitation |
*Call of [[Module PorousMedia]] in order to obtain the infiltration rate | *Call of [[Module PorousMedia]] in order to obtain the infiltration rate | ||
*Update of the water column | *Update of the water column | ||
Revision as of 13:00, 9 March 2011
Contents
Overview
Module Basin is a connection among the different modules of Mohid-Land. Indeed it manages the entering data, namely the water column, that is updated after each call of each module. The final results of this module is the different water fluxes due to evapotranspiration, runoff and infiltration.
Main Processes
The processes made in the Module Basin can be summarized as following:
- Reading entering data and grid construction
- Atmospheric processes in order to obtain the water column from the precipitation
- Call of Module PorousMedia in order to obtain the infiltration rate
- Update of the water column
- Call of Module Runoff
- Redistribution of the fluxes into the water body
- Output of the different components of the water flux
Evapotranspiration
Some water may disappear from the soil because of the evaporation and transpiration processes, which become a sink in soil water profile. These two processes, currently named Evapotranspiration may be modeled using the Penmann Monteith equation.
- λv = Latent heat of vaporization. Energy required per unit mass of water vaporized. (J/g)
- Lv = Volumetric latent heat of vaporization. Energy required per water volume vaporized. (Lv = 2453 MJ m-3)
- E = Mass water evapotranspiration rate (g s-1 m-2)
- ETo = Water volume evapotranspired (m3 s-1 m-2)
- Δ = Rate of change of saturation specific humidity with air temperature. (Pa K-1)
- Rn = Net irradiance (W m-2), the external source of energy flux
- cp = Specific heat capacity of air (J kg-1 K-1)
- ρa = dry air density (kg m-3)
- δe = vapor pressure deficit, or specific humidity (Pa)
- ga = Hydraulic conductivity of air, atmospheric conductance (m s-1)
- gs = Conductivity of stoma, surface conductance (m s-1)
- γ = Psychrometric constant (γ ≈ 66 Pa K-1)
Potential evapotranspiration is calcuçtaed made in module Basin. However, not all of the potential water that can be evaporated or transpirated will be in fact removed from the soil. The water that will really leave the soil through these processes is calculated in the Module PorousMedia.
