geothermal gradient
Let an agent handle the geothermal gradient by value, variation, measurement and applications such as geothermal energy and deep engineering.
Research draft, second pass
A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.
written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify
Researched by: Claude
Purpose and description
Let an agent handle the geothermal gradient by value, variation, measurement and applications such as geothermal energy and deep engineering.
The rate at which temperature increases with depth in the Earth interior, averaging about 25-30 degC per kilometre in continental crust away from plate boundaries, and higher in volcanic and geothermal areas.
What it is for: Geothermal energy, mining, drilling and understanding Earth heat flow.
It can be look up typical and local gradients; estimate temperatures at depth; relate gradients to geothermal potential; find heat flow data.
Distinguishing features
Temperature increase with depth
Varies by region
Linked to heat flow
Basis of geothermal energy
What it looks like
Not visible; measured in boreholes and shown on heat flow maps.
Physical character
typical continental gradient: about 25-30 degC/km - away from plate boundaries
How it is recognised
Degrees Celsius per kilometre
Heat flow maps
Surface temperature gradients are atmospheric
Related models
is a kind of - category
drives - application
is related to - measure
is measured in - method
In practice
Families and kinds
normal continental gradients
high gradients in volcanic areas
low gradients in old cratons
oceanic gradients
Standards and regulation
Geothermal drilling and licensing regulations
Failure modes and hazards
Extrapolating gradients too far
Ignoring local anomalies
Where this came from
wikidata · CC0 1.0
Drafted structure
Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.
Value How steep.
Values vary.
Typical
Averages.
Typical
Typical gradient.
- What is the typical geothermal gradient in this region? measurement
- From which survey or database? provenance
Local
Anomalies.
Local
Local anomalies.
- Are there local anomalies such as volcanic areas? provenance
- What causes them? definition
Measurement Boreholes.
Measurement needs care.
Method
Borehole logging.
Method
Measurement method.
- How is the gradient measured in boreholes? definition
- What corrections are needed? definition
Estimate
Temperature at depth.
Estimate
Temperature at depth.
- What temperature is expected at this depth? measurement
- How uncertain is the extrapolation? boundary
Energy Geothermal use.
Gradients determine potential.
Potential
Resources.
Potential
Geothermal potential.
- Is the gradient high enough for geothermal heating or power here? provenance
- Which studies assess it? provenance
Heat pumps
Shallow systems.
Heat pumps
Ground source heat pumps.
- How do shallow ground source heat pumps differ from deep geothermal? definition
- Which regulations apply? provenance
Engineering Deep works.
Heat affects engineering.
Mining
Deep mines.
Mining
Deep mining.
- How does the gradient affect conditions in deep mines or tunnels? definition
- What cooling is required? provenance
Teaching
Earth science.
Teaching
Teaching.
- How can the geothermal gradient be explained simply? action
- Which data sets help? provenance
What the second pass must settle
- Should heat flow be a separate entry?
- How should heat flow databases be linked?
- How should local variation be represented?