OPERATION CENIZA-ARENA: THE RETENTION OF FALLOUT PARTICLES FROM VOLCAN IRAZU (COSTA RICA) BY PLANTS AND PEOPLE, PART 3
STANFORD RESEARCH INST MENLO PARK CA
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The derivation and evaluation of parametric scaling functions representing the retention of airborne particles by the foliage of various types of plants is presented in this part Part Three of the report on Operation Ceniza-Arena. The scaling functions include, as independent variables, wind speed, particle fall angle, planting density, plant weight, time after contamination, rainfall, and plant shape factors. The output parameters include the fraction of the horizontal component of the particle flux initially retained by the foliage, the relative amount of the retained particles removed by wind- weathering, the relative amount of the retained particles removed by rain, and the rate of growth of plants i.e., rate of accumulation of dry matter with time after planting. Some data on the frequency distributions of plant weights and leaf areas and on the correlation between leaf area or area of other plant parts and the dry weight are presented. In addition, approximating functions are presented for estimating the degree of particle retention by single trees and humans. The numerical evaluation of all the scaling functions was carried out using only the data obtained from the measurements made in Operation Ceniza- Arena during the period from March 1964 through February 1965.
- Geology, Geochemistry and Mineralogy
- Radioactivity, Radioactive Wastes and Fission Products