Two‐dimensional soil moisture flow in a sloping rectangular region: Experimental and numerical studies

Results from experiments with a 3.66 by 0.58 by 0.108 m flume filled with sand are used to study the two-dimensional flow of soil moisture under the condition of rainfall infiltration. The experimental results are compared to results obtained by a numerical solution (via a finite element-finite difference transformation) of the two-dimensional Richards equation. The results are presented in the form of flow field conditions (hydraulic head distribution and position of the phreatic surface) and the rising limb of the runoff hydrograph. The experimental and the numerical results are in satisfactory agreement when the effect of capillary hysteresis is incorporated into the numerical solution. When capillary hysteresis is ignored, the numerically simulated hydrograph lags far behind the experimentally derived hydrograph.

[1]  G. Vachaud,et al.  Experimental and numerical study of a transient, two‐dimensional unsaturated‐saturated water table recharge problem , 1979 .

[2]  R. Miller,et al.  A Quick Method for Estimating Soil Water Diffusivity Functions1 , 1977 .

[3]  M. Anderson,et al.  A laboratory model to investigate the soil moisture conditions on a draining slope , 1977 .

[4]  R. D. Harr,et al.  Water flux in soil and subsoil on a steep forested slope , 1977 .

[5]  Malcolm G. Anderson,et al.  Automatic monitoring of soil moisture conditions in a hillslope spur and hollow , 1977 .

[6]  Y. Mualem,et al.  A conceptual model of hysteresis , 1974 .

[7]  R. Allan Freeze,et al.  Mathematical simulation of subsurface flow contributions to snowmelt runoff, Reynolds Creek Watershed, Idaho , 1974 .

[8]  E. U. Nwa,et al.  Theoretical Two-dimensional Analysis of Natural Rainfall Infiltration into a Sloping Plane , 1973 .

[9]  D. Weyman,et al.  MEASUREMENTS OF THE DOWNSLOPE FLOW OF WATER IN A SOIL , 1973 .

[10]  R. Allan Freeze,et al.  Role of subsurface flow in generating surface runoff: 2. Upstream source areas , 1972 .

[11]  R. D. Black,et al.  Partial Area Contributions to Storm Runoff in a Small New England Watershed , 1970 .

[12]  D. Weyman,et al.  THROUGHFLOW ON HILLSLOPES AND ITS RELATION TO THE STREAM HYDROGRAPH , 1970 .

[13]  R. D. Black,et al.  An Experimental Investigation of Runoff Production in Permeable Soils , 1970 .

[14]  R. Z. Whipkey.  SUBSURFACE STORMFLOW FROM FORESTED SLOPES , 1965 .

[15]  E. Youngs.  AN INFILTRATION METHOD OF MEASURING THE HYDRAULIC CONDUCTIVITY OF UNSATURATED POROUS MATERIALS , 1964 .

[16]  J. Hewlett,et al.  Moisture and energy conditions within a sloping soil mass during drainage , 1963 .

[17]  Keith Beven,et al.  Hillslope hydrographs by the finite element method , 1977 .

[18]  S. P. Neuman,et al.  SATURATED-UNSATURATED SEEPAGE BY FINITE ELEMENTS , 1973 .