天竜川における出水履歴が河床の水質機能に及ぼす影響

• 高橋, 真司

  東北大学工学・工学研究科 技術部

• 兵藤, 誠

  いであ株式会社

• 角, 哲也

  京都大学防災研究所

• 竹門, 康弘

  京都大学防災研究所

書誌事項

タイトル別名

• Effects of Previous Floods on Riverbed Function for Water Purification in the Tenryu River

抄録

Transport dynamics of sediments, POM and solutes are complex phenomena interacting each other in a river ecosystem. In order to know the effects of geomorphological changes by floods on filtering efficiency of the drifting materials, we conducted field surveys on longitudinal changes of water quality in the Tenryu River. Samples of water and suspended sediments were collected at 19 sampling stations three times in 2016-2017 and analyzed chemical parameters of major ion, concentration of suspended sediments. River bed changes were measured as eroded and deposited area of each bar structure using satellite images taken before and after the previous floods occurred just before the survey. The results showed that variability of the hydrochemistry is controlled by temporal and longitudinal factors. The attenuation coefficient of the hydrochemistry was related to the river bed changes of the bar structure. These results suggest that beneficial effects of the water purification function improved by the riverbed fluctuation by the flood.

収録刊行物

• 京都大学防災研究所年報. B

  京都大学防災研究所年報. B 62 (B), 700-712, 2019-09

  京都大学防災研究所

キーワード

• 砂州地形
• 出水履歴
• 水質浄化
• 濾過効率

詳細情報

• CRID: 1050845763870271488
• NII論文ID: 120006770345
• NII書誌ID: AN00027784
• ISSN: 0386412X
• HANDLE: 2433/244996
• 本文言語コード: ja
• 資料種別: departmental bulletin paper
• データソース種別:
  • IRDB
  • CiNii Articles
  • KAKEN