土壌水分ヒステリシスが飽和・不飽和浸透流に及ぼす影響  [in Japanese] The influence of soil water hysteresis on a saturated-unsaturated flow  [in Japanese]

Access this Article

Search this Article

Author(s)

Abstract

ガラスビーズを充填した土槽の左右境界の水位差を一定に保ちながら段階的に水位を変化させることにより、土壌水分ヒステリシスが飽和・不飽和浸透流に及ぼす影響を調べる実験を行った。実験においては、各段階で流れが定常になったあと飽和および不飽和部にトレーサーを注入し、トレーサーの移動を追跡した。本実験により、境界水位が等しい場合でも、排水過程と吸水過程で飽和・不飽和浸透流の流動パターンが大きく異なることが明らかになった。一方、土壌水分ヒステリシスが水分分布やトレーサーの移動経路に及ぼす影響を定量的に評価するため、実験条件でヒステリシスを考慮した飽和・不飽和浸透流の数値解析を行い、実験で求めることができなかった流速ベクトルや流跡線を計算し、ヒステリシスの影響を定量的に評価した。

Laboratory experiments using a container filled with glass beads were conducted to investigate the influence of soil water hysteresis on a saturated-unsaturated flow. Water levels of constant head tanks at the right and left boundary of the container were shifted downward first and then upward while the difference of the water levels of the tanks were kept constant. Tracer was injected at several points in the container to monitor saturated and unsaturated flow after steady states were reached at each stage. These experiments showed clear difference in the pattern of tracer trajectories governed by the soil water hysteresis. Numerical simulations including the effect of the hysteresis were also conducted to evaluate the influence of hysteresis on saturated-unsaturated flow. The simulated results matched quite well with the experiments and further were used to calculate velocity vectors and draw pathlines.

Journal

  • Journal of Groundwater Hydrology

    Journal of Groundwater Hydrology 53(1), 25-39, 2011-02-28

    Japanese Association of Groundwater Hydrology

References:  21

Codes

  • NII Article ID (NAID)
    10028113359
  • NII NACSIS-CAT ID (NCID)
    AN10088275
  • Text Lang
    JPN
  • Article Type
    ART
  • ISSN
    09134182
  • NDL Article ID
    11064389
  • NDL Source Classification
    ZM44(科学技術--地球科学--海洋・陸水・火山)
  • NDL Call No.
    Z15-140
  • Data Source
    CJP  NDL  J-STAGE 
Page Top