물과 미래 (Water for future)

한국수자원학회 (Korea Water Resources Association)
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다공성 매질의 수리특성 추정

Estimation of Hydraulic Properties in Porous Media

  • 발행 : 1994.09.01
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초록

Richards식을 해석하려면 토양의 수리특성인 물보유함수와 비포화투수계수에 대한 자료가 필요하다. SCS에서 구분한 토양군중 A, B, C에 해당한다고 판단되는 토양시료를 채취하여 각 토양군별로 본 연구에서 개발한 장치를 이용하여 물보유함수를 측정하였고, 또한 정수두법으로 포화투수계수를 측정하였다. 각 토양군을 대표할 수 있는 하나의 물보유함수와 비포화투수계수를 산정하기 위하여 van Genuchten의 물보유함수와 Mualem의 투수계수예측모형을 이용하였다. 각 토양군별로 실측된 자료를 이용하여 van Genuchten식의 매개변수를 추정한 값을 제시하였고, 그와 같은 자료는 미실측지역에서 비포화흐름을 해석하고자할 때 하나의 기준으로 사용될 수 있다.

The analysis of Richards eq. requires data of the soil water retention function and the unsaturated hydraulic conductivity. The soil water retention function was measured through the use of the developed apparatus and the saturated hydraulic conductivity was measured by the constant head method for each soil sample corresponding to the A, B, C types of SCS. In order to obtain one water retention function and one unsaturated hydraulic conductivity which represent each soil group, van Genuchten's eq. and Mualem's pore-structure model was chosen respectively. Parameters of van Genuchten's eq. are estimated for each soil group using data obtained in the experiments, and estimated values give a basis to analyze the unsaturated flow in the non-measured region efficiently.

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참고문헌

  1. Trans. of ASAE v.7 no.1 Hydraulic Properties of Porous Media and Their Relation to Drainage Design Brooks,R.H.;Corey,A.T.
  2. Petr. Trans., Am. Inst. Mining Metall. Eng. v.198 Relative Permeability Calculations from Pore-Size Distribution Data Burdine,N.T.
  3. W.R.R. v.26 no.7 A General Mass-Conservative Numerical Solution for the Unsaturated Flow Equation Celia,M.A.;Bouloutas,C.E.;Zarba,R.L.
  4. Proc. of Royal Society of London, Series A v.201 The Permeability of Porous Materials Childs,E.C.;Collis-George,N.
  5. Soil Science v.138 no.6 Comparison of Field & Laboratory-Measured and Predicted Hydraulic Properties of a Soil with Macropores Field,J.A.;Parker,J.C.;Powell,N.L.
  6. W.R.R. v.26 no.5 Modeling One-Dimensional Infiltration into Very Dry Soils 1. Model Development and Evaluation Hills,R.G.;Porro,I.;Hudson,D.B.;Wierenga,P.J.
  7. Jr. of Soil Sci. v.9 no.1 A Relation between Permeability and Size Distribution of Pores Marshall,T.J.
  8. W.R.R. v.12 no.3 A New Model for Predicting the Hydraulic Conductivity of Unsaturated Porous Media Mualem,Y.
  9. W.R.R. v.22 no.9 Water Flow and Solute Transport Process in the Unsaturated Zone Nielsen,D.R.;van Genuchen,M.T.;Bigger,J.W.
  10. W.R.R. v.24 no.3 Determining Soil Hydraulic Properties by Parameter Estimation: On the Selection of a Model for the Hydraulic Properties Russo,D.
  11. Jr. of Soil Sci. Soc. Am. v.44 A Closed-Form Equation for Predicting the Hydraulic Conductivity of Unsaturated Soils van Genuchten,M.T.