Module RunoffProperties

Overview

This is the module in Mohid Land that handles runoff properties, meaning that controls transport (dependent on fluxes computed in runoff). In this module property transformation is not computed since this is usually a fast process and there is not time for microbiological activity or chemical equilibrium. This is also the module that handles erosion/deposition to compute sediment and particulate properties sources and sinks (from sediment bed to runoff water and vice-versa).

Main Processes

Property Transport

Time discretization of property transport in Module RunoffProperties can be explicit or implicit. If user chooses to use implicit formulation, fluxes between runoff cells are implicit computed and also Drainage Network interaction where sinks in runoff occur. Runoff interaction acting as source to runoff and sinks from vegetation (particulate organic material easily eroded from manure) are always computed explicitly.

Spatial discretization (horizontally and vertically) of property transport in Module RunoffProperties can be chosen from several options as in ModuleWaterProperties for each property (e.g. Upwind order 1 to 3, CentralDifferences, LeapFrog..) In order to boost the computation, RunoffProperties has the option of choosing all the same discretization for all the properties (discussed below).

Insert equations for property transport

$Insert formula here$

Insert equation for diffusivity

$Insert formula here$

Erosion/Deposition

Erosion and deposition are function of the shear stress at the soil surface, meaning that higher velocities will tend to erode material and lower velocities will tend to deposit. Sediment bed is simulated as a "fluff layer" representing the easy eroded material in soil.

Insert equation for erosion

$Insert formula here$

Insert equation for deposition

$Insert formula here$

Partition

Partition between particulated and dissolved species is done using a user ratio.

Outputs

Output is done in terms of timeseries and HDF following the MOHID standards.

Data File

Keywords

Units in runoff properties
  Transported properties (soluble)             : g/m3 (or mg/l)  
  Adsorbed properties (non soluble)            : ug/kgsoil   
  Bottom layer Properties (bottom transition)  : kg/m2    

ADVDIFF_EXPLICIT              : 0/1               [1]        !REMARK: Horizontal diffusion is always explicit
                                                              (1 - horiz adv is explicit; 0 - horiz adv is implicit 
ADVDIFF_METHOD_H              : integer      [UpwindOrder1]   !Spatial methods for horizontal advection
                                                              !UpwindOrder1 = 1, UpwindOrder2 = 2, UpwindOrder3 = 3, P2_TVD = 4,
                                                               CentralDif = 5, LeapFrog = 6    !
<beginproperty>
  PARTICULATE                 : 0/1               [0]         !Property physical state: 0 - Dissolved ; 1 - Particulate
    EROSION                   : 0/1               [0]         !Compute erosion (source/sink term) - only read if PARTICULATE : 1
    DEPOSITION                : 0/1               [0]         !Compute deposition (source/sink) - only read if PARTICULATE : 1
      WS_TYPE                 : integer           [1]         !1 -constant;2 -concentration function - only read if DEPOSITION : 1
        WS_VALUE              : real                          !Fall velocity value - only read if WS_TYPE : 1
  ADVECTION_DIFFUSION         : 0/1               [0]         !Property advection - diffusion
      ADVDIFF_METHOD_H        : integer      [UpwindOrder1]   !Spatial methods for horizontal advection
                                                              !UpwindOrder1 = 1, UpwindOrder2 = 2, UpwindOrder3 = 3, P2_TVD = 4,
                                                               CentralDif = 5, LeapFrog = 6    
      ADVDIFF_TVD_LIMIT_H     : integer        [Superbee]     !Horizontal advection non-linear stability conditions
                                                               MinMod = 1, VanLeer = 2, Muscl = 3, Superbee = 4, PDM = 5
      ADVDIFF_VOLUME_RELATION_MAX : real          5.          !The relation between adjacent volumes above which 
                                                              !the advection is upwind
  SOIL_CHEMISTRY              : 0/1               [0]         !Use PREEQC model to change property (source/sink model)
  SOIL_QUALITY                : 0/1               [0]         !Use SedimentQuality model to change property (source/sink model)
  PARTITION                   : 0/1               [0]         !Compute partition between dissolved-particulate phases
      PARTITION_COUPLE        : char               +          !Name of the property (oposite phase) to compute partition
      PARTITION_FRACTION      : real               -          !Percentage of mass of a property in a determined phase 
      PARTITION_RATE          : real            [1 s-1]       !Kinetic rate of partition to reach equilibrium
      USE_SED_REF_CONC        : 0/1               [0]         !Use cohesive sediment concentration as a reference
          SED_REF_CONC        : real              [1]         !Reference cohesive sediment concentration to partition
<endproperty>

Sample

OUTPUT_TIME               : 0 3600
TIME_SERIE_LOCATION       : ..\General Data\TimeSeries\TimeSeriesLocation3D_2m.dat

!Advectin diffusion options
ADVDIFF_EXPLICIT          : 1
!Horizontal diffusion is always explicit
!(1 - adv and diff are explicit in all directions; 0 - adv and diff
!are implicit in vertical. horizontal adv may be explicit or impl)

ADVDIFF_ADVECTION_H_IMP_EXP :  1
!(read if ADVDIFF_EXPLICIT : 0; 0 - horiz adv implicit;
! 1 - horiz adv explicit)


NEW_FORMULATION           : 1   !1 - do not use moduleadvectiondiffusion (removed advection computation); 0 - old formulation
ADVDIFF_METHOD_H          : 1   !UpwindOrder1 = 1. UpwindOrder2 = 2. UpwindOrder3 = 3. P2_TVD = 4.
!CentralDif = 5. LeapFrog = 6
ADVDIFF_METHOD_V          : 1   !UpwindOrder1 = 1. UpwindOrder2 = 2. UpwindOrder3 = 3. P2_TVD = 4.
!CentralDif = 5. LeapFrog = 6

!dispersion
<begin_dispersion_long>
NAME                      : dispersion long
INITIALIZATION_METHOD     : CONSTANT
DEFAULTVALUE              : 0.0
REMAIN_CONSTANT           : 1
<end_dispersion_long>

<begin_dispersion_trans>
NAME                      : dispersion trans
INITIALIZATION_METHOD     : CONSTANT
DEFAULTVALUE              : 0.0
REMAIN_CONSTANT           : 1
<end_dispersion_trans>

!example of rates for use with sediment quality
BOXFLUXES                 : ..\General Data\Boxes\Boxes.dat

<beginSQrate>
NAME                      : ammonia ammonia
DESCRIPTION               : nitrification (-); ammonia imombilization (+)
FIRSTPROP                 : ammonia
SECONDPROP                : ammonia
MODEL                     : SedimentQuality
<endSQrate>


properties needed to run with sediment quality: 
properties simulated: ammonia, nitrate, particulated refractory organic nitrogen, particulate organic nitrogen, nitrogen gas, heterotrophic microorganism nitrogen, autotrophic microorganism nitrogen, anaerobic microorganism nitrogen, urea, particulate labile organic carbon, particulated refractory organic carbon, heterotrophic microorganism carbon, anaerobic microorganism carbon, carbon dioxide, inorganic phosphorus, particulated inorganic phosphorus, particulated refractory organic phosphorus, particulate organic phosphorus, heterotrophic microorganism phosphorus, autotrophic microorganism phosphorus, anaerobic microorganism phosphorus, heterotrophic microorganism population, autotrophic microorganism population, anaerobic microorganism population
properties defined by user (sediment quality does not change them): temperature, salinity, pH, ionic strength, phosphorus adsortion index, soil dry density
properties that can be defined by user or computed: oxygen. oxygen is computed based on temperature and salinity.

<beginproperty>
NAME                      : ammonia
UNITS                     : mgN/L
DESCRIPTION               : ammonia
PARTICULATE               : 0
OLD                       : 0
MIN_VALUE                 : 1E-15
FILE_IN_TIME              : NONE
INITIALIZATION_METHOD     : CONSTANT
DEFAULTVALUE              : 10.           
ADVECTION_DIFFUSION       : 1
ADVDIFF_MOLECULAR_DIFF_COEF :  0.0
DTINTERVAL                : 86400.
SOIL_QUALITY              : 1
SOIL_CHEMISTRY            : 0
TIME_SERIE                : 1
OUTPUT_HDF                : 1
BOX_TIME_SERIE            : 1
<endproperty>