Challenges facing suspended sediment observation in mountain rivers

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  • TAMURA Keiji
    Shinjyo river office, Tohoku Regional Development Bureau, Ministry of Land, Infrastructure, transport and Tourism
  • KOSUGE Yasukazu
    Japan Conservation Engineers & Co., Ltd.
  • UCHIDA Taro
    National Institute for Land and Infrastructure Management, Ministry of Land, Infrastructure, transport and Tourism
  • NAGATA Yoko
    Japan Conservation Engineers & Co., Ltd.
  • KOSUGI Ken'ichirou
    Graduate School of Agriculture, Kyoto University
  • MIZUYAMA Takahisa
    National Graduate Institute for Policy Studies

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Other Title
  • 山地河川における浮遊砂観測の課題と対応
  • サンチ カセン ニ オケル フユウ サ カンソク ノ カダイ ト タイオウ

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Abstract

<p>Suspended sediment in mountain rivers can be observed using two methods : one measures the suspended sediment concentration directly by sampling the water ; the other is indirect measurement using a turbidity meter. The results of this study are as follows. 1) The turbidity meter can only measure the wash load (particle size<0.106 mm). 2) Although the suspended sediment can be easily observed by bucket sampling of water, which is also suitable for ascertaining the characteristics of the wash load, this method is not suitable for continuous monitoring. In contrast, observations obtained with a turbidity meter can be used for continuous monitoring and are appropriate for monitoring the basin but are not suitable for obtaining stable data. 3) It is important to observe the concentration distribution of suspended sediment in the vertical direction by using multistage suspended sediment samplers for a variety of considerations.</p>

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