Cesium 137 and lead 210 in Alpine Lake sediments; Measurements and modeling of mixing processes

Journal Article · Fri Sep 15 04:00:00 EDT 1989 · Journal of Geophysical Research; (USA)

DOI:https://doi.org/10.1029/JC094iC09p12761· OSTI ID:5358897

Pourchet, M; Pinglot, J F ^[1]; Martin d'Heres, France ^[2]; Melieres, M A ^[3]

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1. Laboratoire de Glaciologie et Geophysique de l'Environnement
2. FR
3. Laboratoire de Spectrometrie Physique, St. Martin d'Heres, France

Simulations of {sup 137}Cs distribution in lake sediment cores are presented for slow and rapid mixing processes, for different mixing layers, and for different sampling thicknesses. A parameter characterizing the profile distribution is introduced. Interpretation of the {sup 137}Cs profiles of seven alpine lakes is given using those simulations leading to an estimate of the sedimentation rate, the type of mixing and the thickness of the mixing layer. These parameters are compared with those obtained independently from {sup 210}Pb profiles in three of the lakes. Agreement is satisfactory. The lakes we studied have similar features. In most cases the lakes have mixing which can be approximated by a rapid diffusion process, sedimentation rate of the order of 0.01 g cm{sup {minus}2} yr{sup {minus}1}, and a mixing layer of the order of 2--4 cm. {copyright} American Geophysical Union 1989

• OSTI ID: 5358897
• Journal Information: Journal of Geophysical Research; (USA), Journal Name: Journal of Geophysical Research; (USA) Vol. 94:C9; ISSN 0148-0227; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540330* -- Environment
Aquatic-- Radioactive Materials Monitoring & Transport-- (1990-)
ALKALI METAL ISOTOPES
ALPHA DECAY RADIOISOTOPES
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CESIUM 137
CESIUM ISOTOPES
DIFFUSION
ENVIRONMENTAL TRANSPORT
EVEN-EVEN NUCLEI
HEAVY NUCLEI
ISOTOPE RATIO
ISOTOPES
LAKES
LEAD 210
LEAD ISOTOPES
MASS TRANSFER
MIXING
NATURAL OCCURRENCE
NUCLEI
ODD-EVEN NUCLEI
RADIOISOTOPES
RADIONUCLIDE MIGRATION
SEDIMENTS
SIMULATION
SURFACE WATERS
YEARS LIVING RADIOISOTOPES