During experi ments on sf:d mcnt trnn.sport and real tanca to now with a un.Uorm o. 33 m.r.a sand, data w r t aken on Ute movement ot indh'i• dual rocks having lntermodiato diameters from about O. t to o. 5 foot. Th experiments were conducted in flumo z-toot wide by 60-foet long and for most runs, depth. WM held constant at o. 5 f'eet. The exp r:l menta showed t at rocks on U1e &and bed inov d down tren consistently only it the flow wa.s la the uppor regimci that la, only if 1be ed formi, were plmio boo, standii\i w :vcs , or snUdunes. The rocka moved at velocities th.at ere appro.dmately one • halt or tho averase ve-loc1ty Q.f the water. With all bed form3 in the low

A study of the behavior and transport by the Columbia River of the eleven radionuclides 46Sc, 51Cr, 54Mn, 58Co, 59F9Fe, 60Co, 65Zn, 95Zr‐96Nb, 106Ru, 124Sb, and 140Ba was carried out in the river reach between Pasco and Vancouver, Washington, during the period January 1964 through January 1965. This study was accomplished by direct counting of water salts and filter samples on a multidimensional gamma‐ray spectrometer and represents the first measurements of the interactions of most of these radionuclides in the river. Through this multiple tracer technique, the specific and relative behaviors of these radionuclides in regard to their sorption by and movement with suspended particulate matter in the Columbia River were determined. Depletion of these radionuclides from the river during transport and the radionuclide inventory in the stream bed for the river reach between Pasco and Vancouver were also estimated.

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Amo.unts of radionuclides from the Hanford reactors contained in bed sediments of the Columbia River were estimated by. two methods: (1) from data on radionuclide concentration for the bed sediments between the reactors and McNary Dam, and (2) from data on radionuclide discharge for river stations at Pasco, Washington, and Umatilla, Oregon. Umatilla is 3.2 kilometers below McNary Dam. Accumulations of radionuclides in the Pasco to Umatilla reach estimated by the two methods agree within about 8%. In October 1965 approximately 16,000 curies of gamma emitting radionuclides were resident in bed sediments of the river between the Hanford reactors and McNary Dam. Concentrations and accumulations of chromium -51, zinc-65, cobalt-60, manganese-54, and scandium-46 generally are much higher near McNary Dam than they are in the vicinity of the reactors. These changes are caused by an increase downstream from the reactors in the proportion of the bed sediment that is fine grained and the proportions of the transported zinc, cobalt, manganese, and scandium radionuclides associated with sediment particles.

No abstract