Subsidence Overlay: Difference between revisions

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[[File:Subsidence-Overlay.jpg|thumb|200px|right|The subsidence overlay]]
[[File:Groundwater-Overlay.jpg|thumb|200px|right|The ground water overlay]]
The Subsidence Overlay is an [[Grid overlay|overlay]] that shows which places in the [[project area]] are subject to subsidence due to oxidation and/or compaction of peat. The [[subsidence calculation|calculation]] results can provide insight into the subsidence taking place, and the effects it has on groundwater levels.


{{learned|what the Subsidence overlay is|what information is displayed by the subsidence overlay|how to configure the subsidence overlay}}
The Subsidence Overlay can be used to calculate the amount of subsidence which takes place on peat soil, specifically due to peat oxidation and compaction. The calculations are specific for peat soil. Separate formulas for other soil types have not yet been implemented. Although it's possible to use the overlay to give an impression of subsidence resulting from other factors, the results will be less accurate. This means that results have a greater margin of error for different use-cases.


==What is the subsidence overlay==
It is possible to add multiple subsidence overlays to a project. By varying their configuration slightly, it is possible to calculate multiple scenario's or time-frames simultaneously.
The subsidence overlay is a [[grid overlay]], and part of the [[subsidence calculation|subsidence collection]] of overlays. It shows which places in the [[3D world]] are subject to subsidence due to oxidation and/or compaction of peat.


==How the subsidence overlay calculates==
A project can be enriched with other overlays that are interesting in combination with the Subsidence Overlay. Examples are:
Subsidence is currently composed of 2 forms of reduction of peat: oxidation and compaction. These forms of subsidence are both relevant for the complete picture of subsidence, but are, in principle, calculated via separate formulas. The results of these formulas are added together to get the total amount of subsidence.


===Oxidation===
* The initial [[Ground_watertable_result_type_(Water_Overlay)|Groundwater level]] calculated by the [[Groundwater Overlay]]
Peat, when exposed to oxygen, can oxidize. In this process the peat combines with the air to form CO2, reducing the total mass and volume of the peat. The amount of oxidation depends on the clay thickness, because clay may insulate the peat, preventing it from oxidizing. It also depends on the (lowest) ground water level in relation to the surface of the land.
* The [[Waterwijzer_Overlay|Waterwijzer Overlay]] which calculates the yield loss of crops based on [[Waterwijzer_Overlay#Considerations|several parameters such as Subsidence]]


For information on the exact calculation of subsidence due to oxidation, see the article on [[Subsidence calculation#Oxidation Calculation|Subsidence calculation]].
{{article end
===Compaction===
|howtos=
Peat is a porous and relatively soft terrain type, meaning it can be compressed. Based on the amount of peat in the ground, the density of the top layer, and the net height increase.
* [[How to add and remove an Overlay]]
* [[How to edit an overlay legend|Edit an overlay legend]]
}}


For information on the exact calculation of subsidence due to compaction, see the article on [[Subsidence calculation#Compaction calculation|Subsidence calculation]].
==Module==
===Multi-year calculations===
A Subsidence Overlay can be configured by opening the Subsidence Overlay Wizard. More in-depth information can be found under each of the categories below.
 
{{SubsidenceOverlay_nav}}
Subsidence is calculated in 1-year steps. For each year, the amount of subsidence is calculated. That amount is then used to recalculate the input parameters for the overlay. The next 1-year step is then calculated.
[[Category:Overlays with result types]]
 
{{Overlay nav}}
For more information on the way the multi-year calculation is performed, see [[Subsidence calculation]].
 
==How to configure the subsidence overlay==

Latest revision as of 14:19, 28 February 2024

The subsidence overlay
The ground water overlay

The Subsidence Overlay is an overlay that shows which places in the project area are subject to subsidence due to oxidation and/or compaction of peat. The calculation results can provide insight into the subsidence taking place, and the effects it has on groundwater levels.

The Subsidence Overlay can be used to calculate the amount of subsidence which takes place on peat soil, specifically due to peat oxidation and compaction. The calculations are specific for peat soil. Separate formulas for other soil types have not yet been implemented. Although it's possible to use the overlay to give an impression of subsidence resulting from other factors, the results will be less accurate. This means that results have a greater margin of error for different use-cases.

It is possible to add multiple subsidence overlays to a project. By varying their configuration slightly, it is possible to calculate multiple scenario's or time-frames simultaneously.

A project can be enriched with other overlays that are interesting in combination with the Subsidence Overlay. Examples are:

How-to's

Module

A Subsidence Overlay can be configured by opening the Subsidence Overlay Wizard. More in-depth information can be found under each of the categories below.

Subsidence Module
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Subsidence wiki2.png
Subsidence Overlay
Benchmarks button.png
Getting started button.png
Tutorials
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Overview button.png
Overview
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Theory button.png
Theory
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Benchmarks
Group
Model
Overview • Calculation • Theory
Formulas
Parameter a recalculation • Ground water depth • Oxidation • Compaction • Subsidence • Indexation
Related
Features • Model attributes • Rasters • Result type
Overlays
Categorization
Grid • Parent • Result Child • Result Parent • Result type
Default
City
Administrative
Ownership • Ownership Grid • Zipcodes • Zoning • Neighborhoods • Municipalities • Vacancy
Environmental
Heat Stress • Traffic Density • Traffic Noise • Traffic NO2 • Livability
Water
Rainfall • Flooding • Groundwater • Subsidence • Watershed
Grid Calculation
Average • Combo • Distance • Sight Distance • Travel Distance • Inference • Iteration
Geo Data
GeoTIFF • WCS • WMS • Image • Area • Attribute • Function
Topography
Satellite • Digital Surface Model • Digital Terrain Model • Underground • Source
Network
Network Distance • Network Overview • Network Ownership


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