Geomorphology

1997 Edition

Altimetric frequency curve

  • John I. Clarke
Reference work entry
DOI: https://doi.org/10.1007/3-540-31060-6_8
  • 77 Downloads

The altimetric frequency curve depicts at successive altitudes either the frequency of certain levels (spot heights, highest points in grid squares, summit heights) or the areas or lengths of flats (summits, shoulders, benches, cols). The various methods involve sampling with differing degrees of objectivity, but all are designed to demonstrate the existence of erosion surfaces or levels and to correlate levels from area to area.

Frequencies, areas or lengths (as totals or percentages) are generally plotted on the horizontal axis and altitudinal groups on the vertical. Refinement is possible by subdividing the frequency columns, so as to illustrate the dimensions and lithologies of flats. Interpretation of results varies with the altitudinal class intervals, which themselves are dependent upon the contour intervals of maps. Figure 1shows how running sum class intervals merely smooth out some of the irregularities of simple class frequencies, just as large intervals smooth out the...
This is a preview of subscription content, log in to check access.

References

  1. Baulig, H., 1926, Sur une méthode altimétrique d'analyse morphologique appliquéees à la Bretagne Péninsulaire, Bull. Assoc. Géogr. Français, 10, 7–9.Google Scholar
  2. Baulig, H., 1935, The changing sea-level, Inst. Brit. Geographers, Publ. No. 3.Google Scholar
  3. Baulig, H., 1939, Deux méthodes d'analyse morphologique appliquées à la haute Belgique, Bull. Soc. Belge d'Études Géogr., 9, 165–184.Google Scholar
  4. Clarke, J. I., 1966, Morphometry from Maps, in (Dury, G. H., editor) Essays in Geomorphology, pp. 235–274, London, Heinemann.Google Scholar
  5. Geyl, W. F., 1961, Morphometric analysis and the world-wide occurrence of stepped erosion surfaces, J. Geol., 69, 388–416.Google Scholar
  6. International Geographical Union, 1948a, Problèmes des terrasses, Sixième Rapport de la Commission pour l'Étude des Terrasses Pliocènes et Pleistocènes, Paris, A. Colin.Google Scholar
  7. International Geographical Union, 1948b, Problèmes des terrasses, éclaircissements et répliques, Paris, A. Colin.Google Scholar
  8. Macar, P., 1937–38, Contribution à l'étude géomorphologique de l'Ardenne, Ann. Soc. Géol. Belg., 61, 224–237.Google Scholar
  9. Macar, P., 1955, Appalachian and Ardennes levels of erosion compared, J. Geol., 63, 253–267.Google Scholar
  10. de Smet, R., 1954, Courbe hypsographique et profil moyen de l'Ardenne, Bull. Soc. Belge d'Études Géogr., 23, 146–167.Google Scholar
  11. Thompson, H. D., 1936, Hudson Gorge in the Highlands, Bull. Geol. Soc. Am., 47, 1831–1848.Google Scholar
  12. Thompson, H. D., 1941, Topographic analysis of the Monterey, Staunton and Harrisonburg Quadrangles, J. Geol., 49, 521–549.Google Scholar

Copyright information

© Reinhold Book Corporation 1968

Authors and Affiliations

  • John I. Clarke

There are no affiliations available