Using In-situ Radionuclides To Model
Sediment Transfer At The Flow Event Time Scale
Author(s)
P. Laguionie, A. Crave, P. Bonté & I. Lefèvre
Abstract
Sediment flow modeling over geological time scales requires a good
understanding of the sediment transport modes occurring in rivers. Mean
sediment residence time within hydraulic networks in response to flow events
needs to be determined. In this background, the fallout natural environment
radionuclide beryllium-7 ( 7 Be, half-life of 53.3 days) and the in-situ artificial
radionuclide iodine-131 ( 131 I, half-life of 8.05 days) provide reliable tools to
better understand the sediment transfer at the flow event time scale. Our model is
based on the radioactive decay of the 7 Be and 131 I associated with suspended
sediments. The short half-lives of 7 Be and 131 I allow phenomena to be studied at
the flow event time scale. In this context radionuclide inputs have to be
well-identified. The artificial iodine 131 I source is well-defined as this
radionuclide most likely originates from hospitals where it is used in
radiotherapy. In the case of 7 Be, the possibility that cities are radionuclide traps
as they may provide high radionuclide concentration to channels, at time t,
compared with bank inputs, is discussed. Natural environment radionuclide
potentiality to estimate mean sediment residence time in a river section is
demonstrated from in-situ data.
Keywords: in-situ radionuclides, short-time scales, sediments, transfer model.
1 Introduction
Sediment transfer models in river usually consider a relief at the equilibrium
state, whereas they are established from local erosion-sedimentation processes
involved at short time scales. Thus, it is of primary importance to determine the
Keywords
in-situ radionuclides, short-time scales, sediments, transfer model.
Related Book
Other papers in this volume
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