JOURNAL OF JAPAN SOCIETY OF HYDROLOGY AND WATER RESOURCES
Online ISSN : 1349-2853
Print ISSN : 0915-1389
ISSN-L : 0915-1389
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Volume 27, Issue 4
Displaying 1-5 of 5 articles from this issue
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Original research article
  • Topographical and Geographical Characteristics of Flooded Areas and Visualization of Potential for Pluvial Flooding
    Rina SATO, Takeshi HAYASHI
    2014 Volume 27 Issue 4 Pages 158-169
    Published: July 05, 2014
    Released on J-STAGE: April 08, 2015
    DOIhttps://doi.org/10.3178/jjshwr.27.158
    JOURNAL FREE ACCESS
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     Recently, pluvial flooding has come to be a major flood disaster in Japanese urban area. In this study, we derived topographical and geographical characteristics of flooded areas in eastern Musashino Upland, Tokyo and assessed an area with risk of pluvial flooding using principal component analysis (PCA). Subsequently, areas having similar topographical and geographical characteristics of the flooded areas were extracted from the study area based on the PCA results. Moreover, we extracted areas having similar characteristics from other regions to verify this method. Results show that most flooded areas were included in this area. This results demonstrated the possibility of identify the areas with risk of pluvial flooding according to topographical and geographical characteristics of flooded areas.
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  • Proposal of a Hydrological Model to Estimate a Number of Radioactive Atoms in the Human Body, Radioactivity and Internal Total Exposure Caused by Ingestion of Radioactive Isotopes
    Syota SASAKI, Tadashi YAMADA, Tomohito J. YAMADA
    2014 Volume 27 Issue 4 Pages 170-181
    Published: July 05, 2014
    Released on J-STAGE: April 08, 2015
    DOIhttps://doi.org/10.3178/jjshwr.27.170
    JOURNAL FREE ACCESS
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     This study provides a readily comprehensible hydrology-based model for estimation of the number of radioactive isotopes in the human body, intensity of radioactivity, and internal total exposure without the need for consideration of any complicated mechanism. For example, the International Commission on Radiological Protection has developed an exact model, which is regarded by radiologists as the standard method. However, that method is too complex for non-professional researchers of radiology, including hydrologists, to understand. In contrast, here we calculate the exposure attributable to the ingestion of radioactive isotopes by regarding the human body as a single tissue. Although this study does not involve consideration of a complicated mechanism, it does provide results with accuracy equal to the measured values of intensity of radioactivity obtained using a whole body counter.
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