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Publication Detail
Multi-approach, long and short term denudation rate calculations for the Galician Coast (Ría de Vigo, Spain): AFTD, DEM analysis, river loads and sediment budgets
  • Publication Type:
    Journal article
  • Publication Sub Type:
    Journal Article
  • Authors:
    Pérez-Arlucea M, Carter A, Clemente F, González D, Nombela M
  • Publication date:
    01/12/2005
  • Pagination:
    9, 14
  • Journal:
    Journal of Coastal Research
  • Issue:
    SPEC. ISSUE 49
  • Status:
    Published
  • Print ISSN:
    0749-0208
Abstract
Denudation rates are derived using 5 different approaches: i) Long-term rates (>10 6 a) based on thermochronology (AFTD); ii) theoretical calculations for potential erosion using DEMs, iii) rock volume loss related to landscape evolution; iv) modern sediment yields from river loads, and v) sediment accumulation rates (Ramallosa Complex). AFTD results indicate gradients at or less than global average values of-30°C/km, and therefore place an upper limit from which to estimate the maximum amount of section lost to denudation. Thermal history modeling of the data shows the samples experienced-60°C of cooling over a 150 Ma period. Maximum geothermal gradient values of 30°C/km results in denudation rates of-13 mm/ka, which are consistent with those based on DEMs (10-15 mm/ka). River loads and sediment volume calculations for short-term denudation rates give higher values. The proportion of coarse material, between 90 and 95% of the total, indicates a preponderance of bed-load transport. An increase in sedimentation and denudation rates from 2000 yr BP to 500 yr BP and for the last 500 years may be interpreted as due to human influence. Pollen data suggests that climatic changes during the last 2500 years are insignificant and that vegetation changes are due to human influence.
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