Subsidence Overlay overview: Difference between revisions

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[[File:Subsidence-Overlay.jpg|thumb|200px|right|The subsidence overlay]]
==Result types==
[[File:Groundwater-Overlay.jpg|thumb|200px|right|The ground water overlay]]
The overlay offers the following result types:
The Subsidence Overlay is an [[Grid overlay|overlay]] that shows which places in the [[3D world]] are subject to subsidence due to oxidation and/or compaction of peat. The [[subsidence calulation|calculations]] can give result about the subsidence, and the effects it has on groundwater levels. To add a subsidence overlay go to Geo Data -> Overlays -> Add Subsidence.
{| class="wikitable"
! Result type
! Unit
! Description
|-
| [[Subsidence_result_type_(Subsidence_Overlay)|SUBSIDENCE]]
| m change in land height
| The amount that the ground has lowered as a result of subsidence, both oxidation and compaction. A positive number means the ground has lowered.
|-
| [[Oxidation_result_type_(Subsidence_Overlay)|OXIDATION]]
| m change in land height
| The amount that the ground has lowered as a result of peat oxidation.
|-
| [[Settlement_result_type_(Subsidence_Overlay)|SETTLEMENT]]
| m change in land height
| The amount that the ground has lowered as a result of compaction.
|-
| [[Hi_ground_water_result_type_(Subsidence_Overlay)|HI_GROUND_WATER]]
| m distance from surface to groundwater
| The distance between the ground surface and the highest groundwater level. This number is lower than that of the lowest groundwater level. A positive value means the groundwater is below the surface of the land. A negative value would theoretically mean the groundwater has risen above the surface of the ground.
|-
| [[Low_ground_water_result_type_(Subsidence_Overlay)|LOW_GROUND_WATER]]
| m distance from surface to groundwater
| The distance between the ground surface and the lowest groundwater level. This number is higher than that of the highest groundwater level. A positive value means the groundwater is below the surface of the land. A negative value would theoretically mean the groundwater has risen above the surface of the ground.
|}


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.


{{Template:Subsidence Module buttons}}
{{Template:Subsidence Module buttons}}

Revision as of 15:30, 26 October 2020

Result types

The overlay offers the following result types:

Result type Unit Description
SUBSIDENCE m change in land height The amount that the ground has lowered as a result of subsidence, both oxidation and compaction. A positive number means the ground has lowered.
OXIDATION m change in land height The amount that the ground has lowered as a result of peat oxidation.
SETTLEMENT m change in land height The amount that the ground has lowered as a result of compaction.
HI_GROUND_WATER m distance from surface to groundwater The distance between the ground surface and the highest groundwater level. This number is lower than that of the lowest groundwater level. A positive value means the groundwater is below the surface of the land. A negative value would theoretically mean the groundwater has risen above the surface of the ground.
LOW_GROUND_WATER m distance from surface to groundwater The distance between the ground surface and the lowest groundwater level. This number is higher than that of the highest groundwater level. A positive value means the groundwater is below the surface of the land. A negative value would theoretically mean the groundwater has risen above the surface of the ground.


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Subsidence Overlay
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Tutorials
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Overview
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Theory button.png
Theory
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Benchmarks
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