ESTIMATION OF SEDIMENTARY LAYER THICKNESS USING SUB BOTTOM PROFILER AND CHARACTERISTICES OF THE FLOW AND BED TOPOGRAPHY AT NARROW SEGMENT OF THE YOSHINO RIVER

DOI

Bibliographic Information

Other Title
  • 吉野川岩津狭窄部におけるサブボトムプロファイラーを用いた堆積砂層厚の面的把握と洪水時の流況・河床変動特性

Abstract

<p>In order to determine the maximum depth to be scoured during flooding at the narrow segment at the Iwadu point of the Yoshino River in Japan, we conducted a study to measure the thickness of the sediment layer using a narrow multi-beam and a sub-bottom profiler. The sub-bottom profiler detected a consolidated silt layer at a depth of approximately 10 m below the riverbed. Results from a boring survey conducted at three different points for verification, found that the N value changed sharply at this layer, where estimates indicated the deepest riverbed level historically recorded. In addition, it was nearly the same value with the calculated bed level during the largest discharge condition in the past by the quasi-three dimensional flow analysis.</p>

Journal

Keywords

Details 詳細情報について

  • CRID
    1390854717501733632
  • DOI
    10.11532/river.23.0_299
  • ISSN
    24366714
  • Text Lang
    ja
  • Data Source
    • JaLC
  • Abstract License Flag
    Allowed

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