Difference between revisions of "Process representation across tools"

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== Infiltration into soil moisture (vs surface runoff or surface storage) ==
+
== Infiltration into soil moisture (vs surface runoff or surface ponding) ==
−
'''Note:''' This excludes the case of a modelling unit (HRU, grid cell, area within a subcatchment, etc.) is designated as '''''impervious'''''. In this case, rain inputs would become surface runoff, potentially with a portion staying behind as surface storage if the area has attenuation specified (to represent roughness and flatness).
+
'''Note:''' This excludes the case of a modelling unit (HRU, grid cell, area within a subcatchment, etc.) is designated as '''''impervious'''''. In this case, rain inputs would become surface runoff, potentially with a portion staying behind as surface storage/ponding if the area has attenuation specified (to represent roughness and flatness).
 
{| class="wikitable"
 
{| class="wikitable"
 
! scope="col" style="width:10%" | Algorithm <br/>description
 
! scope="col" style="width:10%" | Algorithm <br/>description
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| style="background: #FFF5FA; vertical-align: top" |
 
| style="background: #FFF5FA; vertical-align: top" |
 
'''yes:'''
 
'''yes:'''
−
<br/>Saturation soil moisture,
+
<br/>Max infiltration rate,
−
<br/>Max infiltration rate
+
<br/>Saturation soil moisture*
 +
<br/> <small>*Saturation excess becomes interflow, not surface runoff</small>
 
| style="background: #FFF7F5; vertical-align: top" |
 
| style="background: #FFF7F5; vertical-align: top" |
 
'''yes:'''
 
'''yes:'''
−
<br/>Saturation soil moisture,
+
<br/>Max infiltration rate,
−
<br/>Max infiltration rate
+
<br/>Saturation soil moisture*
 +
<br/> <small>*Saturation excess becomes interflow, not surface runoff</small>
 
| style="background: #F5FFF5; vertical-align: top" |
 
| style="background: #F5FFF5; vertical-align: top" |
 
'''yes:'''
 
'''yes:'''
−
<br/>Saturation soil moisture  
+
<br/>Saturation soil moisture*
 +
<br/> <small>*Fraction of saturation excess becomes "delayed flow"~interflow, not "quickflow"~surface runoff</small>
 
| style="background: #FFFFF5; vertical-align: top"|
 
| style="background: #FFFFF5; vertical-align: top"|
 
'''yes:'''
 
'''yes:'''
−
<br/>Saturation soil moisture,
+
<br/>Max infiltration rate ''(calculated),''
−
<br/>Max infiltration rate ''(calculated)''
+
<br/>Saturation soil moisture
 
| style="background: #F5FCFF; vertical-align: top" |
 
| style="background: #F5FCFF; vertical-align: top" |
 
'''yes:'''
 
'''yes:'''
−
<br/>Saturation soil moisture,
+
<br/>Max infiltration rate (use: K<small>sat</small>),
−
<br/>Max infiltration rate (use: K<small>sat</small>)
+
<br/>Saturation soil moisture
 
| style="background: #F5F8FF; vertical-align: top" |
 
| style="background: #F5F8FF; vertical-align: top" |
 
'''yes:'''
 
'''yes:'''
−
<br/>Saturation soil moisture,
+
<br/>Max infiltration rate ''(calculated)'',
−
<br/>Max infiltration rate ''(calculated)''
+
<br/>Saturation soil moisture
 
|}
 
|}
 
</br>
 
</br>

Revision as of 14:08, 24 November 2023

PAGE IN PROGRESS - MORE COMING SOON!

building process representation overview tables + links to more specific pages about individual processes

Canopy interception and evaporation (vs throughfall)

Algorithm
description 		WRSM-Pitman SPATSIM-Pitman ACRU4 SWAT2012 MIKE-SHE,
semi-distributed &
fully distributed

Algorithm
inputs
(input data,
parameters,
model-calculated
states/storages)


  • Rain
  • Cover properties:
    • max interception


  • Rain
  • Cover properties:
    • max interception


  • Rain
  • PET
  • Canopy storage (state)
  • Cover properties:
    • max interception (OR LAI)


Canopy interception is not explicitly modelled when using daily timestep modelling.
It is implicitly considered in the ‘initial abstraction’, see infiltration & surface runoff below


  • Rain
  • PET
  • Canopy storage (state)
  • Cover properties:
    • LAI
    • canopy interception coefficient


Function
type 		exponential & threshold exponential & threshold threshold threshold
Thresholds

yes:
timestep interception capacity (calculated)

yes:
timestep interception capacity (calculated)

yes:
timestep interception capacity (calculated)

yes:
timestep interception capacity (calculated)


Infiltration into soil moisture (vs surface runoff or surface ponding)

Note: This excludes the case of a modelling unit (HRU, grid cell, area within a subcatchment, etc.) is designated as impervious. In this case, rain inputs would become surface runoff, potentially with a portion staying behind as surface storage/ponding if the area has attenuation specified (to represent roughness and flatness).

Algorithm
description 		WRSM-Pitman SPATSIM-Pitman ACRU4 SWAT2012 MIKE-SHE,
semi-distributed,
more conceptual 		MIKE-SHE,
fully-distributed,
more physical

Algorithm
inputs
(input data,
parameters,
model-calculated
states/storages)


  • Rain
  • Rainfall distribution factor
  • Soil moisture (state)
  • Soil properties:
    • Saturation soil moisture
    • Infiltration rate distribution (min, max)


  • Rain
  • Rainfall distribution factor
  • Soil moisture (state)
  • Soil properties:
    • Saturation soil moisture
    • Infiltration rate distribution (min, max)


  • Throughfall (rain-interception)
  • Soil moisture within "infiltration depth"(state)
  • Soil properties:
    • Saturation soil moisture
    • "Infiltration depth" parameter
    • Macropore by-pass (clay cracking)


  • Throughfall (rain-interception)
  • Soil moisture (state)
  • Soil properties:
    • Saturation soil moisture
    • Curve number (SCS-CN)
    • Macropore by-pass


  • Throughfall (rain-interception)
  • Soil moisture (state)
  • Soil properties:
    • Saturation soil moisture
    • Saturated hydraulic conductivity (Ksat),
    • Macropore by-pass


  • Throughfall (rain-interception)
  • Soil moisture (state)
  • Soil properties:
    • Saturation soil moisture
    • Soil moisture retention curve
    • Saturated hydraulic conductivity (Ksat),
    • Macropore by-pass


Function
type 		non-linear & threshold non-linear & threshold power & threshold power & threshold linear (rate) & threshold non-linear & threshold
Thresholds

yes:
Max infiltration rate,
Saturation soil moisture*
*Saturation excess becomes interflow, not surface runoff

yes:
Max infiltration rate,
Saturation soil moisture*
*Saturation excess becomes interflow, not surface runoff

yes:
Saturation soil moisture*
*Fraction of saturation excess becomes "delayed flow"~interflow, not "quickflow"~surface runoff

yes:
Max infiltration rate (calculated),
Saturation soil moisture

yes:
Max infiltration rate (use: Ksat),
Saturation soil moisture

yes:
Max infiltration rate (calculated),
Saturation soil moisture


Surface runoff to channel network

Evapotranspiration (ET) from soil moisture (SM)

Evapotranspiration (ET) from groundwater (GW)

Interflow generation & routing to channel network

Aquifer recharge

Groundwater (GW) flow

Aquifer exchange with channel: aquifer outflow or channel transmission losses

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