Subsidence calculation - Revision history

Maxim@tygron.com at 05:49, 26 May 2025

2025-05-26T05:49:59Z

← Older revision		Revision as of 05:49, 26 May 2025
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			{{deprecated}}
	The subsidence model calculates the gradual downward settling of the ground's surface where a peat layer is present. The considered subsidence takes place due to oxidation and compaction of the peat layer.		The subsidence model calculates the gradual downward settling of the ground's surface where a peat layer is present. The considered subsidence takes place due to oxidation and compaction of the peat layer.
	The total subsidence is currently calculated as the result of oxidation and compaction over the years. Oxidation is dependent on the ground water level and the clay thickness. Compaction is dependent on the toplayer thickness, the peat fraction and raised surface terrain.		The total subsidence is currently calculated as the result of oxidation and compaction over the years. Oxidation is dependent on the ground water level and the clay thickness. Compaction is dependent on the toplayer thickness, the peat fraction and raised surface terrain.

Frank@tygron.nl at 14:10, 28 February 2024

2024-02-28T14:10:33Z

← Older revision		Revision as of 14:10, 28 February 2024
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	{{:Years (Subsidence Overlay)}}		{{:Years (Subsidence Overlay)}}
	}}		}}

			{{SubsidenceOverlay_nav}}

Maxim@tygron.com at 15:09, 7 October 2022

2022-10-07T15:09:06Z

← Older revision		Revision as of 15:09, 7 October 2022
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	===Terrain height===		===Terrain height===
	The height of the terrain can be manipulated during a session by stakeholders taking a land sculpting [[action]], creating [[open water]], or ~~constructing~~ [[levee]]s. These actions will result in settlement, which can be found under the Settlement result type. Creating or demolishing [[~~construction~~]]s generally do not change the height of the land, and do not result in changes in the settlement results.		The height of the terrain can be manipulated during a session by stakeholders taking a land sculpting [[action]], creating [[open water]], or building [[levee]]s. These actions will result in settlement, which can be found under the Settlement result type. Creating or demolishing [[building]]s generally do not change the height of the land, and do not result in changes in the settlement results.

	==Configuring overlays==		==Configuring overlays==

Frank@tygron.nl: /* Keys */

2022-01-17T12:27:13Z

Keys

← Older revision		Revision as of 12:27, 17 January 2022
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	If the option to use a Ground Water Tiff is checked, a GeoTIFF can be selected to use for the ground water levels. You can either use any of the provided default GeoTIFFs, or upload and use your own. <br>		If the option to use a Ground Water Tiff is checked, a GeoTIFF can be selected to use for the ground water levels. You can either use any of the provided default GeoTIFFs, or upload and use your own. <br>

	Three ground water ~~GeoTiffs~~ covering the Netherlands are available by default. These GeoTIFFs are a combination between a high resolution GeoTIFF containing ground water levels for rural areas and a low resultion GeoTIFF containing ground water levels for city areas, where data from the low resolution ~~GeoTiff~~ was only used to fill the gaps in the high resolution GeoTIFF.		Three ground water GeoTIFFs covering the Netherlands are available by default. These GeoTIFFs are a combination between a high resolution GeoTIFF containing ground water levels for rural areas and a low resultion GeoTIFF containing ground water levels for city areas, where data from the low resolution GeoTIFF was only used to fill the gaps in the high resolution GeoTIFF.
	One of the available ground water GeoTIFFs, relevant for the Subsidence, is the Mean Lowest Watertable (MLW, or GLG in Dutch).		One of the available ground water GeoTIFFs, relevant for the Subsidence, is the Mean Lowest Watertable (MLW, or GLG in Dutch).

Frank@tygron.nl at 12:26, 17 January 2022

2022-01-17T12:26:07Z

← Older revision		Revision as of 12:26, 17 January 2022
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	'''Ground Water Tiff'''<br>		'''Ground Water Tiff'''<br>
	If the option to use a Ground Water Tiff is checked, a ~~GeoTiff~~ can be selected to use for the ground water levels. You can either use any of the provided default ~~GeoTiffs~~, or upload and use your own. <br>		If the option to use a Ground Water Tiff is checked, a GeoTIFF can be selected to use for the ground water levels. You can either use any of the provided default GeoTIFFs, or upload and use your own. <br>

	Three ground water GeoTiffs covering the Netherlands are available by default. These ~~GeoTiffs~~ are a combination between a high resolution ~~GeoTiff~~ containing ground water levels for rural areas and a low resultion ~~GeoTiff~~ containing ground water levels for city areas, where data from the low resolution GeoTiff was only used to fill the gaps in the high resolution ~~GeoTiff~~.		Three ground water GeoTiffs covering the Netherlands are available by default. These GeoTIFFs are a combination between a high resolution GeoTIFF containing ground water levels for rural areas and a low resultion GeoTIFF containing ground water levels for city areas, where data from the low resolution GeoTiff was only used to fill the gaps in the high resolution GeoTIFF.
	One of the available ground water ~~GeoTiffs~~, relevant for the Subsidence, is the Mean Lowest Watertable (MLW, or GLG in Dutch).		One of the available ground water GeoTIFFs, relevant for the Subsidence, is the Mean Lowest Watertable (MLW, or GLG in Dutch).

	===Attributes===		===Attributes===

Frank@tygron.nl: /* Attributes */

2021-03-15T10:47:28Z

Attributes

← Older revision		Revision as of 10:47, 15 March 2021
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	{{overlay attributes\|suppresscategory=true\|allowselflinks=true\|		{{overlay attributes\|suppresscategory=true\|allowselflinks=true\|
	{{:~~Parameter a~~ (Subsidence Overlay)}}		{{:A (Subsidence Overlay)}}
	{{:B (Subsidence Overlay)}}		{{:B (Subsidence Overlay)}}
	{{:C (Subsidence Overlay)}}		{{:C (Subsidence Overlay)}}

Frank@tygron.nl: /* Attributes */

2021-03-15T10:47:07Z

Attributes

← Older revision		Revision as of 10:47, 15 March 2021
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	{{overlay attributes\|suppresscategory=true\|allowselflinks=true\|		{{overlay attributes\|suppresscategory=true\|allowselflinks=true\|
	{{:Parameter a (Subsidence Overlay)}}		{{:Parameter a (Subsidence Overlay)}}
	{{:~~Parameter b~~ (Subsidence Overlay)}}		{{:B (Subsidence Overlay)}}
	{{:~~Parameter c~~ (Subsidence Overlay)}}		{{:C (Subsidence Overlay)}}
	{{:Climate start temp (Subsidence Overlay)}}		{{:Climate start temp (Subsidence Overlay)}}
	{{:Climate final temp (Subsidence Overlay)}}		{{:Climate final temp (Subsidence Overlay)}}

Frank@tygron.nl: /* Subsidence calculation */

2021-02-10T15:37:26Z

Subsidence calculation

← Older revision		Revision as of 15:37, 10 February 2021
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	===Subsidence calculation===		===Subsidence calculation===
	{{:Subsidence formula (Subsidence Overlay}}		{{:Subsidence formula (Subsidence Overlay)}}

	===Indexation===		===Indexation===

Frank@tygron.nl: /* Calculations */

2021-02-10T14:22:22Z

Calculations

← Older revision		Revision as of 14:22, 10 February 2021
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	* The [[#Ground water depth\|ground water level]] is lowered based on subsidence and surface water level indexation		* The [[#Ground water depth\|ground water level]] is lowered based on subsidence and surface water level indexation
	* The new ground water level serves as input for the next calculation step		* The new ground water level serves as input for the next calculation step

			===Yearly recalculation of Parameter A===
			{{:Parameter a recalculation formula (Subsidence Overlay)}}

			===Ground water depth===
			{{:Ground water depth formula (Subsidence Overlay)}}

	===Oxidation calculation===		===Oxidation calculation===
	{{:Oxidation formula (Subsidence Overlay)}}		{{:Oxidation formula (Subsidence Overlay)}}

	~~====Ground water depth====~~
	~~{{:Ground water depth formula (Subsidence Overlay)}}~~

	===Compaction calculation===		===Compaction calculation===
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	===Indexation===		===Indexation===
	{{:Indexation formula (Subsidence Overlay)}}		{{:Indexation formula (Subsidence Overlay)}}

	~~===Drainage calculation===~~
	~~Drainage can be added to the [[3D World]] as a construction, which affects the ground water levels. Two types of drainage exist: passive and active drainage.~~
	~~====Passive Drainage====~~
	When passive drainage is applied, the lowest and highest ground water levels are adjusted to match the surface water level, plus their respective PASSIVE_DRAINAGE [[#Attributes\|attributes]]. This effect is applied once, at the start of the subsidence calculations. Afterwards, the values of the ground water level can vary due to indexation.

	~~====Active Drainage====~~
	When active drainage is applied, the ground water levels are set to a specific level relative to the surface. The exact distance between the ground water level and the surface is defined by the "drainage" [[Function Values\|Function Value]] of the construction placed. This effect is continuous; at the end of the calculation and for all intermediate steps the ground water level will still be at that same level.

	===Terrain height===		===Terrain height===

Frank@tygron.nl: /* Yearly recalculation of Parameter A */

2021-02-10T14:21:17Z

Yearly recalculation of Parameter A

← Older revision		Revision as of 14:21, 10 February 2021
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	===Subsidence calculation===		===Subsidence calculation===
	{{:Subsidence formula (Subsidence Overlay}}		{{:Subsidence formula (Subsidence Overlay}}

	~~====Yearly recalculation of Parameter A====~~
	~~{{:Parameter a recalculation formula (Subsidence Overlay)}}~~

	===Indexation===		===Indexation===