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Transport of Colloidal Particles in Unsaturated Soils

Research Project

Project/Area Number 21H01424
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 22030:Geotechnical engineering-related
Research InstitutionHokkaido University (2022-2023)
The University of Tokyo (2021)

Principal Investigator

Hamamoto Shoichiro  北海道大学, 農学研究院, 教授 (30581946)

Co-Investigator(Kenkyū-buntansha) 竹村 貴人  日本大学, 文理学部, 教授 (30359591)
大竹 豊  東京大学, 大学院工学系研究科(工学部), 教授 (50425617)
杉本 卓也  筑波大学, 生命環境系, 助教 (70899509)
石田 尚之  同志社大学, 理工学部, 教授 (80344133)
Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥17,550,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥4,050,000)
Fiscal Year 2023: ¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2022: ¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Keywordsコロイド / 多孔質体 / 気液界面 / カラム実験 / 原子間力顕微鏡 / マイクロ流路 / X線CT / 封入空気 / 間隙水組成 / AFM / マイクロ流路デバイス / イオン交換 / マクロ流路
Outline of Research at the Start

地盤内部に存在するナノ・マイクロスケールのコロイド態微粒子は、汚染物質のキャリアーとして働き、土壌・地下水汚染の拡大に寄与することが知られている。地盤内のコロイド粒子は固液・気液界面への捕捉や汚染物質への分配を伴いながら、複雑な液相ネットワーク内を移動する。本研究では,気液界面存在下における多孔質体中のコロイド粒子挙動の実態把握に基づき、不飽和地盤内でのコロイド粒子の地盤内分配・移動特性を解明する。さらに、汚染土壌におけるコロイド粒子およびコロイド担体汚染物質の移動領域・環境影響範囲評価に資するコロイド粒子の地盤内移動モデルを提案する。

Outline of Final Research Achievements

The purpose of this study was to elucidate the behavior of colloidal particles in porous media in the presence of an air-liquid interface. Column experiments using colloidal particle suspensions suggested that the presence of enclosed air promotes colloidal particle behavior, depending on the chemical composition of the porewater. X-ray CT image analysis also revealed that the presence of enclosed air (diameter and distribution) affects the water permeability. Under the conditions of this experiment, no colloidal particle desorption phenomenon under the cation exchange reaction was observed in both the column and microfluidic experiments.

Academic Significance and Societal Importance of the Research Achievements

本研究から封入空気の存在が、多孔質体中の通水性ならびにコロイド粒子挙動に影響を与えることを明らかにした。自然土壌環境において、地下水下の飽和帯では封入空気は存在することが考えられ、土壌内のコロイド挙動のより精緻な予測に向けた重要な基礎的知見が得られた。さらに、X線CT画像解析から、吸水下では排水下に比べて連結した空気ネットワークが形成されることを明らかにし、土壌水分ヒステリシスが土壌内物質挙動に与える影響について重要な知見が得られた。イオン交換反応下でのコロイド脱離挙動についても、カラム実験、原子間力顕微鏡、マイクロ流路などの異なるスケールで実験からコロイド挙動を解析した点は学術的意義が高い。

Report

(4 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • Research Products

    (14 results)

All 2023 2022 2021

All Journal Article (6 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 5 results,  Open Access: 2 results) Presentation (8 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Effects of thermal properties of porous media on local thermal (non-)equilibrium heat transport2023

    • Author(s)
      BANDAI Toshiyuki、HAMAMOTO Shoichiro、RAU Gabriel C、KOMATSU Toshiko、NISHIMURA Taku
    • Journal Title

      Journal of Groundwater Hydrology

      Volume: 65 Issue: 2 Pages: 125-139

    • DOI

      10.5917/jagh.65.125

    • ISSN
      0913-4182, 2185-5943
    • Year and Date
      2023-05-31
    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Pore connectivity influences mass transport in natural rocks: Pore structure, gas diffusion and batch sorption studies2023

    • Author(s)
      Yuan Xiaoqing、Hu Qinhong、Lin Xiang、Zhao Chen、Wang Qiming、Tachi Yukio、Fukatsu Yuta、Hamamoto Shoichiro、Siitari-Kauppi Marja、Li Xiaodong
    • Journal Title

      Journal of Hydrology

      Volume: 618 Pages: 129172-129172

    • DOI

      10.1016/j.jhydrol.2023.129172

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Impact of Water Management on Methane Emission Dynamics in Sri Lankan Paddy Ecosystems2023

    • Author(s)
      Lakshani M. M. Tharindi、Deepagoda T. K. K. Chamindu、Li Yuan、Hansen H. F. E.、Elberling Bo、Nissanka Sarath P.、Senanayake Dassanayake M. J. B.、Hamamoto Shoichiro、Babu G. L. Sivakumar、Chanakya Hoysala N.、G. Parameswaran T.、Arunkumar Pandit G.、Sander Bjoern Ole、Clough Timothy J.、Smits Kathleen
    • Journal Title

      Water

      Volume: 15 Issue: 21 Pages: 3715-3715

    • DOI

      10.3390/w15213715

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A new exponential model for predicting soil gas diffusivity with varying degree of saturation2023

    • Author(s)
      M. M. T. Lakshani, T. K. K. Chamindu Deepagoda, Shoichiro Hamamoto, Bo Elberling, Wei Fu, Ting Yang, Jun Fan, Xiaoyi Ma, Timothy Clough, Kathleen M. Smits, T. G. Parameswaran, G. L. Sivakumar Babu, H. Chanakya
    • Journal Title

      Vadose Zone Journal

      Volume: 23 Issue: 1 Pages: 1-15

    • DOI

      10.1002/vzj2.20236

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Effect of cation exchange on colloid transport in saturated porous media2022

    • Author(s)
      東 陸太郎、濱本 昌一郎、西村 拓
    • Journal Title

      Journal of the Japanese Society of Soil Physics

      Volume: 150 Issue: 0 Pages: 105-113

    • DOI

      10.34467/jssoilphysics.150.0_105

    • ISSN
      0387-6012, 2435-2497
    • Year and Date
      2022-03-20
    • Related Report
      2021 Annual Research Report
  • [Journal Article] Water‐ and air‐filled pore networks and transport parameters under drying and wetting processes2022

    • Author(s)
      Hamamoto Shoichiro、Ohko Yushi、Ohtake Yutaka、Moldrup Per、Nishimura Taku
    • Journal Title

      Vadose Zone Journal

      Volume: 21 Issue: 4 Pages: 1-13

    • DOI

      10.1002/vzj2.20205

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Effects of Cation Exchange on Colloidal Particle Behavior near Solid-Water Interface2023

    • Author(s)
      Rikutaro Higashi, Shoichiro Hamamoto, Naoyuki Ishida, Taku Nishimura
    • Organizer
      日本地球惑星連合大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 陽イオン交換反応が固液界面近傍におけるコロイド挙動に与える影響2023

    • Author(s)
      東陸太郎、濱本昌一郎、石田尚之、西村拓
    • Organizer
      農業農村工学会大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] Effects of cation exchange on colloid transport in saturated porous media2022

    • Author(s)
      HIGASHI, R., HAMAMOTO, S.
    • Organizer
      Tsukuba Global Science Week 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Coupling of Data Assimilation and Hydrus for Modeling Soil-Water and Heat Transport of Rain-Fed Soybean Field throughout Japan2022

    • Author(s)
      Atm SAKIUR Rahman, , Shoichiro Hamamoto, , Hirotaka Saito, , Kenichi Tatsumi, , Takemasa Miyoshi, Naoto Nihei, Yasunori Ichihashi
    • Organizer
      ASA, CSSA, and SSSA International Annual Meetings
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] GeoWEPPを用いた風化花崗岩森林流域の水土砂流出計算2022

    • Author(s)
      山崎琢平,濱本昌一郎,西村拓
    • Organizer
      農業農村工学会大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] 土壌空気が間隙ネットワーク特性および物質移動に及ぼす影響2021

    • Author(s)
      濱本昌一郎, 大古湧之, 大竹豊, 西村拓
    • Organizer
      土壌物理学会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Effect of Cation Exchange on Colloid Transport in Saturated Porous Media2021

    • Author(s)
      Rikutaro Higashi, Shoichiro Hamamoto, and Taku Nishimura
    • Organizer
      2021 JpGU meeting
    • Related Report
      2021 Annual Research Report
  • [Presentation] 陽イオン交換反応が飽和多孔質媒体中のコロイド輸送に与える影響2021

    • Author(s)
      東陸太郎, 濱本昌一郎, 西村拓
    • Organizer
      2021年度農業農村工学会大会
    • Related Report
      2021 Annual Research Report

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Published: 2021-04-28   Modified: 2025-01-30  

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