吉野川上流長沢ダム流域における放射性同位体を用いた微細土砂供給源の推定

• 加藤 弘亮

  砂防学会 筑波大学大学院生命環境科学研究科

• 恩田 裕一

  砂防学会 筑波大学生命環境科学研究科

• 平松 晋也

  砂防学会 信州大学農学部

• 柏木 章子

  筑波大学生命環境科学研究科

• 宮本 邦明

  砂防学会 筑波大学生命環境科学研究科

書誌事項

タイトル別名

• Determining the sources of sediment using radionuclides in Nagasawa Reservoir Catchment, Upper Yoshino River
• ヨシノガワ ジョウリュウ ナガサワ ダム リュウイキ ニ オケル ホウシャセイ ドウイタイ オ モチイタ ビサイ ドシャ キョウキュウ ゲン ノ スイテイ

抄録

The concentrations of Cs-137 and Pb-210_ex in fluvial sediment and soil were analyzed to determine the sources of fine sediment collected at 9 tributaries located in Nagasawa reservoir catchment, Shikoku Island, Japan. The major sedi-ment source was identified as subsoil derived from landslide scar or channel bank, but sediment production from forest floor was also identified from the existence of Cs-137 and Pb-210_ex/Cs-137 ratio. It was indicated that sediment production caused by past landslide dominated in subcatchments with high percentage of landslide area, but sediment production from forest area was also estimated in subcatchments with small landslide area. The surface soil of land-slide scars were characterized by high concentration of Pb-210_ex. The concentrations of Pb-210_ex in sediment collected in Tebako-dani catchment increased with downstream distance. This implied that residence time of sediment could be estimated by comparison with direct deposition rate of Pb-210_ex. It was concluded that the sources of fine sediment could be determined by analyzing the concentrations of Cs-137 and Pb-210_ex in channel bed.

収録刊行物

• 砂防学会誌

  砂防学会誌 58 (2), 5-14, 2005

  Japan Society of Erosion Control Engineering

キーワード

• Cs-137
• Pb-210_ex
• sediment sources
• landslide area
• residence time

詳細情報

• CRID: 1390282679043273344
• NII論文ID: 130004296283
• NII論文ID: 10016632850
• NII書誌ID: AN0012035X
• DOI: 10.11475/sabo1973.58.2_5
• NDL書誌ID: 7431354
• ISSN: 02868385
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7431354
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可