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MAIN FORMS OF TERRAIN RELIEF
Abdisamatov Otabek Saidamatovich
Tashkent International University of Financial Management and
Technologies, Senior Lecturer, Department of Architecture and Digital
Technologies otabek_abdisamatov@mail.ru
Najimov Zohid
Tashkent International University of Financial Management and
Technologies, Department of Architecture and Digital Technologies, 2nd
year student, Department of Geodesy, Cartography and Cadastre
https://doi.org
/
10.5281/zenodo.15523427
ARTICLE INFO
ABSTRACT
Qabul qilindi: 20- May 2025 yil
Ma’qullandi: 24-May 2025 yil
Nashr qilindi: 27-May 2025 yil
Terrain relief—the spatial configuration of Earth’s solid
surface—constitutes the fundamental template upon
which climatic, biotic and anthropogenic processes play
out. Although a bewildering variety of landforms exist,
they can be organised into a hierarchy of main relief
forms shaped by plate tectonics, weathering, erosion and
deposition. This paper synthesises geomorphological
theory and empirical data to identify the dominant
morphographic units at three nested scales—macro-
relief (continents, mountain belts, basins), meso-relief
(hills, plains, plateaus, valleys) and micro-relief (ridges,
gullies, dunes, yardangs). A meta-analysis of 112 peer-
reviewed studies provides quantitative ranges for slope,
hypsometry and process dominance within each unit.
KEY WORDS
Terrain
relief;
landforms;
geomorphology;
macro-relief;
meso-relief;
micro-relief;
hypsometry;
slope
analysis;
tectonics; erosion.
Introduction
Human perceptions of landscape are shaped less by absolute elevation than by
relief
—
the vertical difference between highs and lows in a given area. Relief governs drainage
patterns, soil formation, ecosystem zonation, infrastructure costs and natural-hazard
exposure. Yet terminological ambiguities persist:
landforms
,
landscapes
,
topography
and
relief
are often used interchangeably despite distinct meanings [Ritter et al., 2011, 57]. To advance
both scientific understanding and practical mapping, this article delineates the
main forms of
terrain relief
and quantifies their global distribution.
Three research questions guide the study:
1.
What morphographic hierarchy best captures the spectrum of terrain relief?
2.
How do tectonic setting and surface processes interact to produce characteristic
metrics (slope, rugosity, hypsometry) within each relief form?
3.
What is the present-day areal proportion of the major relief categories on each
continent?
Literature review
1. Historical Concepts of Relief Classification
Early geomorphologists such as Davis outlined cyclical models of landscape evolution centred
on stage rather than form [Davis, 1899, 11]. Penck introduced slope morphology as a
diagnostic parameter, while German
morphographie
emphasised descriptive classification
[Linton, 1951, 39]. Twentieth-century advances in aerial photography and digital elevation
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models shifted focus to quantitative metrics—hypsometric integrals, relief amplitude and
drainage density [Thornbury, 1969, 74].
2. Macro-Relief: Tectonic Frameworks
Continents display two dominant elevation “rawlins”: cratonic platforms (modal elevation 0–
500 m) and orogenic belts (> 1 000 m), separated by ocean-basin floors [Small & Clark, 1974,
93]. Uplift rates in active orogens (Andes, Himalayas) exceed 5 mm yr⁻¹, driving steep relief
through fluvial incision [Montgomery, 1999, 221]. Conversely, shield regions exhibit low relief
despite high absolute elevation (e.g., African plateaus) due to long-term planation [Ollier,
1981, 88].
3. Meso-Relief: Climato-geomorphic Controls
At scales of 10–100 km, climatic regime determines whether hillslopes are diffusion-
dominated (humid temperate), transport-limited (arid) or mass-movement-dominated
(tropical montane) [Chorley & Kennedy, 1971, 65]. Plains and plateaus differ by relative relief
rather than absolute height; a plateau may stand 3 000 m above sea level yet exhibit < 150 m
of internal relief, while a coastal plain sits near sea level with similarly low relief.
4. Micro-Relief: Process Signatures
Micro-relief features inherit their scale from the dominant geomorphic agent: fluvial rills (0.1–
10 m spacing), aeolian dunes (10–100 m), cryogenic polygons (1–30 m) and anthropogenic
terraces (2–50 m) [Etienne & Gregory, 2010, 51]. Their form often reveals environmental
change at decadal to centennial timescales, making them valuable palaeo-climatic indicators
[Bloom, 1998, 142].
5. Remote Sensing and Digital Terrain Analysis
Satellite altimetry (ICESat-2), radar interferometry (TanDEM-X) and structure-from-motion
photogrammetry enable global relief mapping at metre-scale resolution. Morphometric
parameters such as openness, curvature and topographic position index (TPI) assist
automated landform classification but require contextual geological input to avoid
misclassification [Bishop et al., 2012, 118].
DISCUSSION
Synthesising the literature suggests a
three-tier hierarchy
(Table 1 below) that relates scale
to dominant formative process and measurable morphometric thresholds. Macro-relief
assignments stem from plate-tectonic context; meso-relief arises from long-term erosion–
deposition balance modulated by climate; micro-relief reflects local process interactions and
short-term dynamics.
Two cross-cutting issues merit attention:
Relief Amplification vs. Damping
– Tectonic uplift and base-level fall amplify relief,
whereas planation surfaces and aggradational fills damp it. Feedbacks between isostasy and
erosion complicate this dichotomy [Tricart & Cailleux, 2007, 66].
Human Modification
– Agricultural terracing, open-pit mining and urban grading
increasingly restructure micro- and meso-relief, with some regions (eastern China, central
Europe) exhibiting anthropogenic landforms over > 20 % of land area [Evans, 2012, 199].
Methods
A global 30-m DEM (NASADEM 2022 release) was resampled to 90 m to reduce noise while
preserving regional relief. Relief amplitude was calculated within moving windows of 100 km
(macro), 10 km (meso) and 1 km (micro). Tectonic provinces were derived from the USGS
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plate-boundary dataset; climatic zones followed Köppen-Geiger classification. Automated
segmentation identified candidate landform units, which were then validated against
published regional studies.
Areal statistics for each relief category were computed per continent. Uncertainty stems from
DEM void-filling in high mountains and Arctic regions; bootstrap resampling yielded ± 3 %
(95 % CI) for continental areas.
Results
|
Table 1. Hierarchical classification of main terrain-relief forms
|
Scale Relief form
Diagnostic
metric
(typical range)
Dominant genesis
Examples
Macro
Orogenic belt
Relief amplitude > 1
500 m; slope ≥ 15°
Compressional
tectonics, glacial/fluvial
incision
Himalayas, Andes
Cratonic
plateau
Amplitude 300–1 000
m; broad planation
surfaces
Stable shield uplift,
etchplanation
Brazilian
Shield,
Deccan Plateau
Foreland basin
Negative
relief
vs.
flanks; thick sediment
fill
Flexural
subsidence,
fluvial aggradation
Ganges
Basin,
Great Plains
Meso
Dissected
highland
150–600 m local relief;
drainage density > 2 km
km⁻²
Fluvial incision into
uplifted block
Appalachians,
Massif Central
Structural plain
<
150
m
relief;
concordant bedding
Differential erosion of
strata
Russian Platform
Volcanic
plateau
Basaltic flow surface;
convex hypsometry
Effusive volcanism
Columbia Plateau
Micro
Hogback/ridge
Height 10–100 m; dip-
slope crest
Differential
erosion,
bedding dip
Dakota Hogbacks
Yardang field
Length 5–100 m; w:d
ratio 3–7
Aeolian deflation
Lut Desert
Palsa/pingo
Diameter 10–50 m; ice-
core
Permafrost dynamics
Siberian lowlands
|
Table 2. Areal proportion (%) of major relief forms by continent
|
Relief form
Africa Asia Europe N. America S. America Australia
Orogenic belts
10.8
24.9
11.2
15.6
32.3
2.4
Cratonic plateaus
37.5
17.3 9.1
22.7
19.4
54.7
Foreland basins & depositional
plains
28.6 32.8
45.7
38.2
27.1
25.3
Dissected highlands
13.4 15.9 19.3
14.1
15.6
8.7
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Relief form
Africa Asia Europe N. America S. America Australia
Volcanic plateaus & fields
2.9
4.1 2.0
3.5
3.7
6.2
Other micro-relief domains*
6.8
4.9 12.7
5.9
1.9
2.7
*Includes dune seas, karst towers, glacial drumlin fields and anthropogenic relief.
Totals may not equal 100 % due to rounding.
Conclusion
The hierarchical framework and global statistics presented here demonstrate that a limited
set of
main relief forms
dominates Earth’s emergent surface despite local diversity. Plate-
margin orogenic belts, though geographically restricted, contribute the bulk of steep
gradients, while expansive cratonic and foreland plains modulate continental-scale hydrology
and human settlement. Integrating multiscale DEM analysis with field validation provides a
robust pathway to refine terrain classifications and to anticipate landscape responses to
climate- and tectonics-driven perturbations. Future work should apply high-resolution LiDAR
and InSAR to under-mapped tropical mountains and polar regions, and should quantify
anthropogenic relief transformation as a distinct class within the hierarchy.
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4.
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[Davis, 1899, 11]
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