Anomaly between the Theoretical and Actual Groundwater Flow Velocity in the Unsaturated Zone

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概要

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• Various studies have shown that groundwater tends to flow faster than predicted by the conventional advection-dispersion-diffusion model. This tendency is pronounced in the unsaturated zone compared to the saturated zone. To determine this tendency quantitatively, an experiment was conducted on intact and repacked soil columns. The columns were subjected to simulated irrigation. The resulting soil moisture breakthrough curves (BTCs) were analyzed and compared with the theoretical BTCs to assess the degree of anomaly between the theoretical and actual groundwater flow velocity. The results show that, due to the preferential (bypass) flow, the actual velocity of groundwater flow is about two times faster than the theoretical one. The dye experiment, conducted to obtain visual evidence of the preferential flow, matched the conclusions of the chemical experiment.

• 愛媛大学の論文

著者

• Shrestha Hari

  Graduate School Of Science And Eng. Ehime University

• Yatabe Ryuichi

  Department Of Civil And Env. Eng. Ehime University

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