Terrain (Subsidence Overlay)

Terrains in a project have a number of properties which can influence the subsidence calculation. The subsidence model only takes properties of underground terrains into account. By default each location in the project area is covered by an underground terrain, and therefore each grid cell of the subsidence model can be given default values for the subsidence keys listed below. The subsidence terrain keys can all be overridden by overlapping Subsidence areas.

Icon	Key	Unit	Range	Description	Default value
	CLAY_THICKNESS	m		The thickness of the clay layer on the peat, for the calculation of the oxidation component of subsidence.	0.2
	PEAT_FRACTION			The fraction of the soil composed of peat, for the calculation of the compaction component of subsidence.	0.4
	TOPLAYER_THICKNESS	m		The thickness of the layer covering the peat, for the calculation of the compaction component of subsidence.	1.2
	SUBSIDENCE	boolean		Whether or not subsidence should be calculated for a terrain or in a given area. Subsidence is calculated when the value is not equal to 0.	false

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Subsidence Module

Subsidence Overlay

Tutorials

Overview

Theory

Benchmarks

Group

Subsidence features

Model

Overview • Calculation • Theory

Water area

Water level • Water level output • Indexation

Ground water level

Hi ground water level • Low ground water level

Subsidence area

Peat fraction • Clay thickness • Toplayer thickness • Subsidence

Terrain

Peat fraction • Clay thickness • Toplayer thickness • Subsidence

Drainage

Drainage

Related

Model attributes • Rasters • Result type •  Subsidence Model