La Houille Blanche
Number 3-4, Juin 1989
|Page(s)||231 - 234|
|Published online||01 October 2009|
Etude du transport de galets par les torrents au moyen de traceurs radioactifs
The study of the transport of pebbles by torrents by means of radioactive tracers
Service d'application des radioéléments, CEA Saclay
Conservancy of rivers and, particularly, the construction of dams need an estimation of the transport of pebbles by torrents located up stream. This transport involves a great number of parameters, most of which mathematical models are unable to take into account. Thus, extrapolation of semi-emperical formulaes actually available does not allow precise quantification within a reasonable safety margin. The use of pebbles labelled with a radioisotope easily detectable in situ, tantale 182 (half-life 114 days, energy from 0,07 to 1,2 MeV), allows, in most cases, both a qualitative and quantitative study of solids transport by torrents. Numerous experiments, from 1968 til today have permitted to improve and optimize the method.
© Société Hydrotechnique de France, 1989
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