Oxidation formula (Subsidence Overlay): Difference between revisions

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(Created page with "The amount of subsidence due to oxidation is calculated by the following formula: <math>S_O = d_{gw} * a_{y} - d_{ct} * b - c</math> where <math>S_O</math> is the subsidenc...")
 
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The amount of subsidence due to oxidation is calculated by the following formula:
The amount of subsidence due to oxidation is calculated by the following formula:


<math>S_O = d_{gw} * a_{y} - d_{ct} * b - c</math>
<math>S_O = d_{gw,y} * a_{y} - d_{ct} * b - c</math>


where
where


<math>S_O</math> is the subsidence due to oxidation.
* <math>S_O</math> is the subsidence due to oxidation.
<math>d_{gw}</math> is the ground water depth, based on the [[lowest ground water level]] (glg).
* <math>d_{gw,y}</math> is the [[Ground water depth formula (Subsidence Overlay)|calculated ground water depth]] for year y.
<math>a_{y}</math> is the [[calculated a parameter value]] for the current year <math>y</math>.
* <math>a_{y}</math> is the [[calculated a parameter value]] for the current year <math>y</math>.
<math>d_{ct}</math> is the clay thickness of the terrain, defined by [[Clay thickness (Subsidence Overlay)|CLAY_THICKNESS]]
* <math>d_{ct}</math> is the clay thickness of the terrain, defined by [[Clay thickness (Subsidence Overlay)|CLAY_THICKNESS]]
<math>b</math> is the b parameter value, defined by [[Parameter b (Subsidence Overlay)|PARAMETER B]]
* <math>b</math> is the b parameter value, defined by [[Parameter b (Subsidence Overlay)|PARAMETER B]]
<math>c</math> is the c parameter value, defined by [[Parameter c (Subsidence Overlay)|PARAMETER C]]
* <math>c</math> is the c parameter value, defined by [[Parameter c (Subsidence Overlay)|PARAMETER C]]


* The ground water level (expressed in meters below surface), most commonly the lowest ground water level. This value is recalculated as part of the calculations over multiple years. (This value is capped as 1.2m. If the ground water level is further from the surface than 1.2m, 1.2m is used.)
This formula was provided by experts, who have derived this formula empirically.
* The clay thickness is an attribute in the project. The exact attribute which provide this value can be configured as {{inlink|Keys}} in the overlay.
* The a, b and c parameters are climate values which can be configured as {{inlink|Attributes}} in the overlay. the a value is also recalculated as part of the calculations over multiple years.
 
This formula was provided by experts, who have established this formula empirically.

Revision as of 09:39, 9 February 2021

The amount of subsidence due to oxidation is calculated by the following formula:

Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle S_O = d_{gw,y} * a_{y} - d_{ct} * b - c}

where

  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle S_O} is the subsidence due to oxidation.
  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle d_{gw,y}} is the calculated ground water depth for year y.
  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle a_{y}} is the calculated a parameter value for the current year Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle y} .
  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle d_{ct}} is the clay thickness of the terrain, defined by CLAY_THICKNESS
  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle b} is the b parameter value, defined by PARAMETER B
  • Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle c} is the c parameter value, defined by PARAMETER C

This formula was provided by experts, who have derived this formula empirically.

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