| Автор | Raats, P. A. C. |
| Автор | Gardner, W. R. |
| Дата выпуска | 1971 |
| dc.description | It is shown that the critical pressure head used by Bouwer is equal to the difference in matric flux potential at pressure heads zero and minus infinity divided by the hydraulic conductivity at pressure head zero. The critical pressure head and the saturated hydraulic conductivity are used to define a dimensionless pressure head, hydraulic conductivity, and matric flux potential. For six empirical relationships between pressure head and hydraulic conductivity, the associated matric flux potential and critical pressure head have been evaluated. The plots of the dimensionless hydraulic conductivity and mattic flux potential versus pressure head provide a clear basis for comparing the six models. A discussion of steady, p‐dimensional, radially symmetric flow (without gravity) illustrates the occurrence of the matrio flux potential and the critical pressure head in flow problems. Expressions are obtained for the steady flux, the maximum steady flux, and the change in steady flux as a function of changes in pressure head at two points. One‐dimensional, cylindrically symmetric, and radially symmetric flows are discussed as special cases. The results for the radially symmetric case suggest a new method for in situ determination of the hydraulic conductivity as a function of the pressure head. |
| Формат | application.pdf |
| Копирайт | Copyright 1971 by the American Geophysical Union. |
| Название | Comparison of Empirical Relationships between Pressure Head and Hydraulic Conductivity and Some Observations on Radially Symmetric Flow |
| Тип | article |
| DOI | 10.1029/WR007i004p00921 |
| Electronic ISSN | 1944-7973 |
| Print ISSN | 0043-1397 |
| Журнал | Water Resources Research |
| Том | 7 |
| Первая страница | 921 |
| Последняя страница | 928 |
| Выпуск | 4 |
| Библиографическая ссылка | Bouwer, H., Unsaturated flow in groundwater hydraulics, J. Hydraul. Div., Amer. Soc. Civil Eng., 90, 121–144, 1964. |
| Библиографическая ссылка | Bouwer, H., Rapid field measurement of air entry value and hydraulic conductivity of soil as significant parameters in flow system analysis, Water Resour. Res., 24, 729–738, 1966. |
| Библиографическая ссылка | Bouwer, H., Theory of seepage from open channels, Advances in Hydroscience, 5Ven TeChow, 121–172, Academic, New York, 1969. |
| Библиографическая ссылка | Brooks, R. H., A. T.Corey, Hydraulic properties of porous mediaHydrol. Pap. 3, 1–27Colorado State University, Fort Collins, 1964. |
| Библиографическая ссылка | Gardner, W. R., Some steady‐state solutions of the unsaturated moisture flow equation with application to evaporation from a water table, Soil Sci., 85, 228–232, 1958. |
| Библиографическая ссылка | Green, W. H., G. A.Ampt, Studies in soil physics, 1, The flow of air and water through soils, J. Agr. Sci., 4, 1–24, 1911. |
| Библиографическая ссылка | Klute, A., D. B.Peters, Water uptake and root growth, Root GrowthW. J.Whittington, 105–133, Butterworths, London, 1969. |
| Библиографическая ссылка | Lang, A. R. G., W. R.Gardner, Limitation to water flux from soils to plants, Agron. J., 62, 693–695, 1970. |
| Библиографическая ссылка | Mobasheri, F., M.Shahbazi, D. K.Todd, Lateral movement of water through the unsaturated zone of an unconfined aquifer, Hydraul. Lab. Contrib., 106, 37, Water Resources Center, University of California, Berkeley, 1965. |
| Библиографическая ссылка | Myers, L. E., C. H. M.vanBayel, Measurement and evaluation of water table elevations, Proc. 5th Congr. Int. Comm. Irrig. Drain, 109–119, Tokyo, Japan, 1963. |
| Библиографическая ссылка | Philip, J. R., Steady infiltration from buried point sources and spherical cavities, Water Resour. Res., 45, 1039–1047, 1968. |
| Библиографическая ссылка | Philip, J. R., Theory of infiltration, Advances in Hydroscience, 5Ven TeChow, 215–296, Academic, New York, 1969. |
| Библиографическая ссылка | Raats, P. A. C., Steady infiltration from line sources and furrows, Soil Sci. Soc. Amer. Proc., 34, 709–714, 1970. |
| Библиографическая ссылка | Richards, L. A., Capillary conduction of liquids through porous mediums, Physics, 1, 318–333, 1931. |
| Библиографическая ссылка | Rijtema, P. E., An analysis of actual evapotranspiration, Agr. Res. Rep., 659, 107, Centre for Agricultural Publications and Documentation, Wageningen, The Netherlands, 1965. |
| Библиографическая ссылка | Smiles, D. E., G. D.Towher, The steady‐state measurement of the relation between hydraulic conductivity and moisture content in soils, Water Resour. Res., 45, 1029–1030, 1968. |
| Библиографическая ссылка | Whisler, F. D., Analyzing steady‐state flow in an inclined soil slab with an electric analog, Soil Sci. Soc. Amer. Proc., 33, 19–25, 1969. |
| Библиографическая ссылка | Whisler, F. D., A.Klute, R. J.Millington, Analysis of radial, steady‐state, solution and solute flow, Soil Sci. Soc. Amer. Proc., 34, 382–387, 1970. |
| Библиографическая ссылка | Wind, G. P., A field experiment concerning capillary rise of moisture in a heavy soil, Neth. J. Agr. Sci., 3, 60–69, 1955. |
| Библиографическая ссылка | Weeding, R. A., Steady infiltration from a shallow circular pond, Water Resour. Res., 46, 1259–1273, 1968. |
