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GeoJournal

, Volume 23, Issue 1, pp 7–17 | Cite as

Sediment yield in South Africa — A preliminary geographical analysis

  • Boucher Kim 
  • Weaver Alex van Breda 
Soil Erosion and Host Materials in Africa

Abstract

The study examines the spatial relationships between sediment yield and 15 independent environmental variables in 54 catchments in South Africa. Rooseboom's (1978) data on the sediment yield from the catchments were standardized for a single time period. Bivariate regression analyses reveal no simple relationships. Multivariate regression analyses conducted for the whole and various sub-areas of South Africa indicate that latitude and longitude are the primary variables affecting spatial variations in sediment yield. This may be as a result of latitude and longitude being surrogate variables reflecting variation in other environmental variables (e. g. geology, vegetation). Within the sub-areas, 43.4% to 97.8% of the variation in sediment yield is explained by the combined variation in a number of different environmental variables. This study highlights a need for the collection and analysis of more sediment yield data, which would allow the analyses to be refined, to predict sediment yields from ungauged catchments in South Africa.

Keywords

Regression Analysis Environmental Variable Yield Data Multivariate Regression Spatial Relationship 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. Clark, W. A. V.; Hosking, P. L.: Statistical Methods for Geographers. John Wiley and Sons, New York 1986.Google Scholar
  2. Department of Water Affairs: River Flow Data Monthly Summaries: October 1960 to September 1970. Hydrological Information Publication No. 10, Government Printer, Pretoria 1978.Google Scholar
  3. Dixon, W. J. (ed.): BMDP Statistical Software, University of California, Los Angeles 1985.Google Scholar
  4. Doornkamp, J. L.; Tyson, P. D.: A note on the areal distribution of suspended sediment yield in South Africa. Journal of Hydrology 20, 335–340 (1973).Google Scholar
  5. Dunne, T.: Sediment yield and land use in tropical catchments. Journal of Hydrology 42, 281–300 (1979)Google Scholar
  6. Fournier, F.: Climat et erosion. Presses Universitaires de France, Paris 1960.Google Scholar
  7. Hadley, R. F.; Lal, R.; Onstad, C. A.; Walling, D. E.; Yair, A.: Recent developments in erosion and sediment yield studies, UNESCO, Paris 1985.Google Scholar
  8. Harmse, H. J. von M.: Schematic Soil Map of Southern Africa, South of Latitude 16°3′. Biogeography and Ecology of Southern Africa, Dr. W. Junk Publishers, The Hague 1978.Google Scholar
  9. Jansen, J. M. L.; Painter, R. B.: Predicting sediment yield from climate and topography. Journal of Hydrology 21, 371–380 (1973)Google Scholar
  10. Jansson, M. B.: A global survey of sediment yield. Geografiska Annaler 70A, 1–2, 81–98 (1988)Google Scholar
  11. Langbein, W. B.; Schumm, S. A.: Yield of sediment in relation to mean annual precipitation. Transactions of the American Geophysical Union 39, 1076–1084 (1958)Google Scholar
  12. Le Roux, J.: Unpublished paper delivered at the Quadrennial Conference of the Society for Geography, Stellenbosch 1985.Google Scholar
  13. Middleton, B. J.; Lorentz, S. A.; Pitman, W. V.; Midgley, D. C.: Surface Water Resources of South Africa. Report No. 12/81, Water Research Commission, Volume V., University of Witwatersrand, Johannesburg 1981.Google Scholar
  14. Morgan, R. P. C.: Soil Erosion and Conservation. Longman, London 1986.Google Scholar
  15. Pitman, W. V.; Potgieter, D. J.; Middleton, D. C.; Midgley, D. C.: Surface Water Resources of South Africa, Report No. 13/81, Water Research Commission, Volume IV, University of Witwatersrand, Johannesburg 1981.Google Scholar
  16. Rooseboom, A.: Sedimentafvoer in suider-Afrikaanse Riviere. Water S. A. 4, 1, 14–17 (1978)Google Scholar
  17. Rooseboom, A.; Harmse, H. J. van M.: Changes in the sediment load of the Orange River during the period 1929–1969. The Hydrology of Areas of Low Precipitation, I. A. H. S., Publication No. 128, 459–470 (1979)Google Scholar
  18. Rutherford, M. C.; Westfall, R. H.: Biomes of Southern Africa: An Objective Categorization. Memoirs olf the Botanical Survey of South Africa No. 54, Botanical Research Institute, Department of Agriculture and Water Supply, Republic of South Africa 1986.Google Scholar
  19. Walton, C. (ed.): Reader's Digest Atlas of Southern Africa. Directorate of Surveys and Mapping, Department of Community Development 1984.Google Scholar
  20. Ward, R. C.: Principles of Hydrology, McGraw-Hill, London 1975.Google Scholar
  21. Wilson, L.: Seasonal sediment yield patterns of United States rivers. Water Resources Research 8, 1470–1479 (1972)PubMedGoogle Scholar
  22. Wilson, L.: Variations in mean annual sediment yield as a function of mean annual precipitation. American Journal Science 273 B., 335–349 (1973)Google Scholar

Copyright information

© Kluwer Academic Publishers 1991

Authors and Affiliations

  • Boucher Kim 
    • 1
  • Weaver Alex van Breda 
    • 1
  1. 1.Department of GeographyRhodes UniversityGrahamstownSouth Africa

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