Parameter a recalculation formula (Subsidence Overlay): Difference between revisions
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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} )</math> | ||
* <math>a_{y}</math> = The a parameter for the current year. | * <math>a_{y}</math> = The a parameter for the current year. | ||
* <math>a_{0}</math> = The a parameter value at the start of the calculation, defined by [[Parameter a (Subsidence Overlay)|Parameter a]]. | * <math>a_{0}</math> = The a parameter value at the start of the calculation, defined by [[Parameter a (Subsidence Overlay)|Parameter a]]. | ||
* <math>y_{y}</math> = The current year. | * <math>y_{y}</math> = The current 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]]. | ||
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* <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>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]]. | * <math>f_{ox}</math> = Oxidation factor, defined by [[Climate_oxidation_(Subsidence_Overlay)|CLIMATE_OXIDATION]]. | ||
Revision as of 15:24, 8 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:
- = The a parameter for the current year.
- = The a parameter value at the start of the calculation, defined by Parameter a.
- = The current 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.
- Group
- Model
- Parameter a recalculation • Ground water depth • Oxidation • Compaction • Subsidence • Indexation
- Related