In-situ Determination of Unsaturated Hydraulic Conductivity using Profile Probe

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  • プロファイル水分計を用いた不飽和透水係数の原位置試験法
  • プロファイル スイブンケイ オ モチイタ フホウワ トウスイ ケイスウ ノ ゲン イチ シケンホウ

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Estimation of the unsaturated hydraulic conductivity function is essential to provide proper input parameters for water flow simulation and prediction. The instantaneous profile method, referred to as the internal drainage method, was applied to determine hydraulic conductivity as a function of volumetric water content in a sand dune field. An automated monitoring system for volumetric water content and soil water pressure head with a data-logger was developed using a profile probe and a dual type underground suction gauge respectively. Calibration curves of the profile probe for the dune sand were made in the laboratory. The geometrical time series data collection by the data-logger for better estimation of the hydraulic conductivity was proposed. The hydraulic conductivity of the dune sand was determined by the internal drainage method and the unit hydraulic gradient methods. The results agreed well with the previously obtained data by the steady state infiltration method and the steady state evaporation method. It was concluded that hydraulic conductivities determined by a simple method with unit gradient assumption and using experimental function of soil water storage with elapsed time gave reasonable results.

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