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2009 Fiscal Year Final Research Report

Control and Modeling of Seawater Intrusion for Conservation of Fresh Groundwater in Coastal Aquifers

Research Project

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Project/Area Number 19580283
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Irrigation, drainage and rural engineering/Rural planning
Research InstitutionKagoshima University

Principal Investigator

MOMII Kazuro  Kagoshima University, 農学部, 教授 (40136536)

Co-Investigator(Kenkyū-buntansha) NAKAGAWA Kei  鹿児島大学, 農学部, 准教授 (90315135)
Project Period (FY) 2007 – 2009
Keywords海水侵入 / 地下水 / 地下ダム / 人工涵養 / 室内実験 / 数値計算 / 水資源
Research Abstract

Seawater intrusion is often a major constraint to optimal use of fresh groundwater from coastal aquifers. Excessive groundwater extraction to meet growing demands from an increasing coastal population and the expected rise in mean sea level from global warming will cause seawater to encroach farther inland and threaten the available groundwater supply. In this study, laboratory experiments and numerical analysis were performed to determine the effectiveness of physical barriers and artificial recharge methods to control the seawater intrusion in coastal aquifers. The physical barriers examined were subsurface dams and partially penetrating flow barriers, while the artificial recharge methods included recharge ponds and recharge wells. In the study of subsurface dams, experimental and numerical results show that the residual saltwater trapped in storage areas by cutoff walls is completely flushed out by the freshwater flow from inland.
In the study of subsurface flow barriers, we found that saltwater repulsion was linearly related to horizontal barrier location and a third-order polynomial function of penetration depth. For a particular freshwater discharge, this relationship can be used to determine the theoretical saltwater repulsion achieved by subsurface flow barriers of specific depth and location relative to the toe of the intruding saltwater wedge.
In the artificial recharge studies, results show that more effective saltwater repulsion can be achieved when recharge is applied near the saltwater toe. Recharge becomes less effective when applied farther and higher from the toe. These findings imply that, for the same recharge rate, recharge wells are more effective than recharge ponds in repulsing saltwater intrusion.

  • Research Products

    (11 results)

All 2010 2009 2008 2007

All Journal Article (4 results) (of which Peer Reviewed: 4 results) Presentation (7 results)

  • [Journal Article] Modelling reactive solute transport from groundwater to soil surface under evaporation.2010

    • Author(s)
      Nakagawa, K., Hosokawa, T., Wada, S.-I., Momii, K., Jinno, K., Berndtsson, R.
    • Journal Title

      Hydrological Processes 24

      Pages: 608-617

    • Peer Reviewed
  • [Journal Article] Laboratory-scale saltwater behavior due to subsurface cutoff wall.2009

    • Author(s)
      Luyun Jr., R., Momii, K., Nakagawa, K.
    • Journal Title

      Journal of Hydrology 377

      Pages: 227-236

    • Peer Reviewed
  • [Journal Article] Effects of artificial recharge and physical barrier on seawater intrusion.2009

    • Author(s)
      Luyun Jr., R., Momii, K., Nakagawa, K., Takahashi, M.
    • Journal Title

      Annual Journal of Hydraulic Engineering, JSCE 53

      Pages: 85-90

    • Peer Reviewed
  • [Journal Article] Saltwater dynamics due to cutoff wall installation in coastal unconfined aquifers: experimental and numerical studies.2008

    • Author(s)
      Luyun Jr., R., Momii, K., Nakagawa, K., Fujiyama, S.
    • Journal Title

      International Association of Hydrological Sciences Publication 320

      Pages: 214-219

    • Peer Reviewed
  • [Presentation] Effective location of injection wells and cutoff walls for controlling seawater intrusion2010

    • Author(s)
      Kei Nakagawa, Kazuro Momii, Roger Luyun Jr
    • Organizer
      7th Congress of the Asia and Pacific Division of the International Association of Hydraulic Engineering and Research
    • Place of Presentation
      Auckland, New Zealand
    • Year and Date
      20100121-20100224
  • [Presentation] Laboratory-scale effects of flow barriers on seawater intrusion2009

    • Author(s)
      Roger Luyun Jr., 籾井和朗, 中川啓
    • Organizer
      日本地下水学会2009年秋季講演会(札幌大会)
    • Place of Presentation
      日北海道立道民センターかるで2・7(札幌市)
    • Year and Date
      2009-10-16
  • [Presentation] Effects of physical barrier and artificial recharge on seawater intrusion. XXXVI International Association of Hydrogeologists Congress2008

    • Author(s)
      Luyun Jr., R., Momii, K., Nakagawa, K., Imahase, F.
    • Organizer
      Integrating Groundwater Science and Human Well-being
    • Place of Presentation
      Toyama International Center, Toyama
    • Year and Date
      20081026-20081101
  • [Presentation] 淡水注入による塩水侵入抑制効果に関する検討2008

    • Author(s)
      高橋昌弘, 籾井和朗, 中川啓
    • Organizer
      日本地下水学会2008年秋季講演会
    • Place of Presentation
      九州大学(福岡)
    • Year and Date
      2008-11-21
  • [Presentation] Saltwater dynamics due to cutoff wall installation- The effect of grid spacing on numerical simulations2008

    • Author(s)
      Luyun Jr., R., Momii K., Nakagawa K.
    • Organizer
      日本地下水学会2008年秋季講演会
    • Place of Presentation
      九州大学(福岡)
    • Year and Date
      2008-11-21
  • [Presentation] Nitrate transport process through volcanic ash soil2007

    • Author(s)
      Nakagawa, K., Momii, K., Berntdsson, R.
    • Organizer
      6th International Groundwater Quality Conference
    • Place of Presentation
      Fremantle, Western Australi
    • Year and Date
      20071202-20071207
  • [Presentation] Saltwater dynamics due to cutoff wall installation in coastal unconfined aquifers: Experimental and numerical studies. Pre-published Proceedings of Sixth International Conference on Calibration and Reliability in Groundwater Modelling2007

    • Author(s)
      Luyun Jr., R., Momii, K., Nakagawa, K., Fujiyama, S.
    • Organizer
      Credibility in Modelling
    • Place of Presentation
      Copenhagen, Denmark
    • Year and Date
      20070909-20070913

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Published: 2011-06-18   Modified: 2016-04-21  

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