00000nam 2200000zi 4500 9.870571 CaOODSP 20241203113647 m o d f cr bn||||||||| 190326s1991 onca ob f000 0 eng d CaOODSP eng rda CaOODSP eng fre En13-5/91-05E-PDF Joshi, S. R. (Sewak Ram) author. The role of water/soil distribution coefficient in the watershed transport of radionuclides / S.R. Joshi and B.S. Shukla. Burlington, Ontario : National Water Research Institute = Institut national de recherche sur les eaux, [1991] 1 online resource (6 unnumbered pages, 13 pages, 1 unnumbered page) : illustrations. text txt rdacontent computer c rdamedia online resource cr rdacarrier NWRI contribution ; no. 91-05 Digitized edition from print [produced by Environment and Climate Change Canada]. Includes bibliographical references (pages 10-12). "The concept of the distribution coefficient is invoked to rationalize the observed dependence of the watershed residence time of a radionuclide on its nature. A mathematical model is presented to show that this residence time is proportional to the dimensionless field distribution coefficient of the radionuclide. The proportionality constant, β, is defined as the ratio of the volume of rain-impacted soil in the watershed and the annual volume of rainfall in the watershed or expressed as the ratio between the water penetration depth in soil and the annual thickness of water above the soil surface. An empirical evaluation of β supports our assumption of its constancy in a given watershed. The described model may be very useful in deciphering the impact of atmospherically-delivered pollutants on watershed quality. Expressions are also derived to estimate the value of soil erosion constant using naturally occurring radionuclides"--Abstract. Includes management perspective and abstract in French. Mathematical models gccst Radioactive materials gccst Water pollution Shukla, Bhagwan S. (Bhagwan Sahay), 1943- author. Canada. Environment Canada. National Water Research Institute (Canada). Lakes Research Branch. University of Toronto. Department of Chemistry. National Water Research Institute (Canada) NWRI contribution ; no. 91-05. (CaOODSP)9.844121 PDF 1.51 MB https://publications.gc.ca/collections/collection_2019/eccc/en13-5/En13-5-91-05-eng.pdf