Parameter a recalculation formula (Subsidence Overlay): Difference between revisions

From Tygron Support wiki
Jump to navigation Jump to search
(Created page with "The ''a'' parameter is recalculated yearly, to account for a changing climate. The new value for the ''a'' parameter is obtained by multiplying the original Parameter a (Sub...")
 
No edit summary
 
(10 intermediate revisions by the same user not shown)
Line 13: Line 13:
Delta subsidence is calculated as:
Delta subsidence is calculated as:


<math>\Delta{S}=\Delta{MA} \cdot f_{ox}</math>
<math>\Delta{s_{sub}}=\Delta{MA} \cdot f_{ox}</math>


The new ''parameter a'' value for year y is calculated as:
The new ''parameter a'' value for year y is calculated as:


<math>a_y = a_0 \cdot ( 1 + \Delta{S} )</math>
<math>a_y = a_0 \cdot ( 1.0 + \Delta{s_{sub}} )</math>


* <math>a_{y}</math> = The a parameter for the current year.
where
* <math>a_{0}</math> = The defined a parameter to start the calculation with.
: <math>a_{y}</math> = The a parameter for the current year.
* <math>T_{y}</math> = The interpolated average temperature for the calculation in the current year.
: <math>a_{0}</math> = The a parameter value at the start of the calculation, defined by [[A (Subsidence Overlay)|the model attribute A]].
* <math>y_{y}</math> = The current year.
: <math>y_{y}</math> = The current year. The first year is defined by [[Start year (Subsidence Overlay)|START_YEAR]].
* <math>y_{start}</math> = The start year of the simulation, defined by [[Climate start year (Subsidence Overlay)|CLIMATE_START_YEAR]].
: <math>y_{start}</math> = The start year of the simulation, defined by [[Climate start year (Subsidence Overlay)|CLIMATE_START_YEAR]].
* <math>y_{end}</math> = The final year of the simulation, defined by the addition of the start year and [[Years_(Subsidence_Overlay)|YEARS]].
: <math>y_{end}</math> = The final year of the simulation, defined by the addition of the start year and [[Years_(Subsidence_Overlay)|YEARS]].
* <math>T_{start}</math> = The average temperature of the start year, defined by [[Climate_final_temp_(Subsidence_Overlay)|CLIMATE_START_TEMP]].
: <math>T_{start}</math> = The average temperature of the start year, defined by [[Climate_final_temp_(Subsidence_Overlay)|CLIMATE_START_TEMP]].
* <math>T_{final}</math> = The average temperature of the final year, defined by [[Climate_final_temp_(Subsidence_Overlay)|CLIMATE_FINAL_TEMP]].
: <math>T_{final}</math> = The average temperature of the final year, defined by [[Climate_final_temp_(Subsidence_Overlay)|CLIMATE_FINAL_TEMP]].
* <math>Q_{10}</math> = The Q10 factor, configured as 3. This value is currently not adjustable
: <math>Q_{10}</math> = The Q10 factor, configured as 3. This value is currently not adjustable.
* <math>T_{y}</math> = The interpolated average temperature for the calculation in the current year.
: <math>f_{st}</math> = Soil temperature factor, defined by [[Climate_soil_temp_factor_(Subsidence_Overlay)|CLIMATE_SOIL_TEMP_FACTOR]].
* <math>f_{st}</math> = Soil temperature factor, defined by [[Climate_soil_temp_factor_(Subsidence_Overlay)|CLIMATE_SOIL_TEMP_FACTOR]].
: <math>f_{ox}</math> = Oxidation factor, defined by [[Climate_oxidation_(Subsidence_Overlay)|CLIMATE_OXIDATION]].<noinclude>
* <math>f_{ox}</math> = Oxidation factor, defined by [[Climate_oxidation_(Subsidence_Overlay)|CLIMATE_OXIDATION]].
 
<noinclude>
{{Template:SubsidenceOverlay_nav}}
{{Template:SubsidenceOverlay_nav}}
</noinclude>
</noinclude>

Latest revision as of 13:28, 16 February 2021

The a parameter is recalculated yearly, to account for a changing climate. The new value for the a parameter is obtained by multiplying the original Parameter a is with a factor. This factor is calculated based on an interpolated average temperature for that year, a soil temperature factor, micro activity and an oxidation factor.

The value of the a parameter is updated each year as follows:

Delta temperature is calculated as:

Delta micro activity is calculated as:

Delta subsidence is calculated as:

The new parameter a value for year y is calculated as:

where

= The a parameter for the current year.
= The a parameter value at the start of the calculation, defined by the model attribute A.
= The current year. The first year is defined by START_YEAR.
= The start year of the simulation, defined by CLIMATE_START_YEAR.
= The final year of the simulation, defined by the addition of the start year and YEARS.
= The average temperature of the start year, defined by CLIMATE_START_TEMP.
= The average temperature of the final year, defined by CLIMATE_FINAL_TEMP.
= The Q10 factor, configured as 3. This value is currently not adjustable.
= Soil temperature factor, defined by CLIMATE_SOIL_TEMP_FACTOR.
= Oxidation factor, defined by CLIMATE_OXIDATION.
Subsidence Module
Benchmarks button.png
Subsidence wiki2.png
Subsidence Overlay
Benchmarks button.png
Getting started button.png
Tutorials
Benchmarks button.png
Overview button.png
Overview
Benchmarks button.png
Theory button.png
Theory
Benchmarks button.png
Benchmarks button.png
Benchmarks
Group
Model
Overview • Calculation • Theory
Formulas
Parameter a recalculation • Ground water depth • Oxidation • Compaction • Subsidence • Indexation
Related
Features • Model attributes • Rasters • Result type


Retrieved from "https://support.tygron.com/w/index.php?title=Parameter_a_recalculation_formula_(Subsidence_Overlay)&oldid=40933"