
The Accuracy of Singlelayered and Multilayered Dynamic
Filtration Models for Particulate Interception and Retention
in Plant Canopies
John E. Pinder III
Savannah River Ecology Laboratory, Aiken, South Carolina 29801, USA
ABSTRACT
Models of the form
dA (t)/dt = [ 1  EXP(µB(t))] D  ^_{e}A(t)
where A (t) is the radionuclide inventory (Bq m^{2}) on the vegetation at time t, B (t)
is the vegetation biomass (kg dry mass m^{2}) at t, µ is the absorption coefficient (m^{2}
kg^{1}), D is the radionuclide deposition rate (Bq m^{2} t^{1}), and A_{e}, is the effective
loss rate constant (t^{1}) for radionuclide loss from plant surfaces, were used to
predict the ^{238}Pu inventories of wheat, soybeans and corn. Data on ^{238}Pu
inventories due to deposition were available from several fields near the HArea
nuclear fuel chemical separations facility on the US Department of Energy's
Savannah River Site. Estimates of µ and A_{e} were also obtainedfrom studies near
HArea. Themodelwasgenerallyaccurate. Eighteen of the 2O predicted inventories
were within a factor of 2 of the observed mean inventories. Median predicted to
observed ratios were101, 123 and 075 for wheat, soybeans and corn,
respectively. A multilayered model composed of separate equations for 1m
height intervals of corn was slightly more accurate with median predicted to
observed ratios of 117, 108 and 10l for the 0l m, 12 m and >2 m layers,
respectively.
SREL Reprint #1555
Pinder, J.E., III. 1991. The accuracy of single layered and multi layered dynamic
filtration models for particulate interception and retention in plant canopies. Journal
of Environmental Radioactivity 14:3753.
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