Post‐Irrigation Movement of Soil Water: 1. Redistribution

作者：W. R. Gardner, Daniel Hillel, Yoram Benyamini · 发表于：Water Resources Research · 年份：1970 · DOI：10.1029/wr006i003p00851 · 被引用次数：200 · 研究领域：Soil and Unsaturated Flow、Irrigation Practices and Water Management

Water content measurements by γ‐ray attenuation in soil columns were made during redistribution following irrigation. Approximate solutions of the unsaturated flow equation are derived that describe the water content above the initial wetting front as a function of time. For times sufficiently large, these solutions reduce to the frequently used empirical expression W = a t−b, where W is soil water content, t is time, and a and b are constants. These constants can thus be related to the capillary conductivity and soil water diffusivity.