Hidrología de paleocrecidas en el río Kuiseb (Namibia) y sus implicaciones en la recarga de acuíferos

• G. Benito ^[3] ; T. Grodek ^[1] ; Y. Enzel ^[1] ; Naomi Porat ^[4] ; J. Jacoby ^[1] ; O. Dahan ^[2] ; G. Van Langenhove ^[5] ; M. Seely ^[6] ; B. Botero ^[3]
  1. [1] Hebrew University of Jerusalem

     Hebrew University of Jerusalem

     Israel

     
  2. [2] Ben-Gurion University of the Negev

     Ben-Gurion University of the Negev

     Israel

     
  3. [3] CSIC-Centro de Ciencias Medioambientales
  4. [4] Geological Survey of Israel
  5. [5] Ministry of Agriculture, Windhoek, Namibia.
  6. [6] The Desert Research Foundation of Namibia

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• Localización: Contribuciones al estudio del periodo cuaternario / coord. por Javier Lario, Pablo G. Silva Barroso, 2007, ISBN 978-84-7484-201-2, págs. 15-16
• Idioma: español
• Texto completo no disponible (Saber más ...)
• Resumen

  • The Kuiseb River floods attenuate along the >100 km bedrock canyon channel, losing by transmission large volumes into a relatively wide (200-400 m) sandy braided alluvial downstream channel (~100 km) and reached the ocean only ~10 times since 1890. Slackwater flood deposition was found at 29 sites along ~120 km of the canyons of the Kuiseb River and its main tributary, the Gaub River and there were documented, dated (14C, OSL), and modeled five sites/reaches. A sequence of 13 flood units since early 20th century and 27 flood units since about >1000 years ago have been described. Step-backwater calculations using HEC-RAS indicate that floods of ~850 m3sec-1 deposited these two sequences. The largest Kuiseb River flood upstream of the Gaub-Kuiseb confluence was estimated in ~1350 m3s-1 based on a line of rotten tree logs on top of thin flood deposited (>5 ka) overlying a much older terrace. The frequency of these large floods is then used in determining the long-term frequency of recharging events along the entire river.