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This article in SSSAJ

  1. Vol. 71 No. 6, p. 1667-1675
     
    Received: June 15, 2006
    Published: Nov, 2007


    * Corresponding author(s): renl@mx.cei.gov.cn
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doi:10.2136/sssaj2006.0227

Assessing the Size Dependency of Measured Hydraulic Conductivity Using Double-Ring Infiltrometers and Numerical Simulation

  1. Jianbin Lai and
  2. Li Ren *
  1. Department of Soil and Water Sciences, China Agricultural Univ., Key Lab. of Plant–Soil Interactions, MOE, Beijing 100094, China

Abstract

Saturated hydraulic conductivity measurements are important for understanding and modeling hydrologic processes at the field scale. Few systematic studies have been conducted on how the size of double-ring infiltrometers affects the measured hydraulic conductivity. To determine this size effect, we measured saturated hydraulic conductivity at seven sites using four different sizes of double-ring infiltrometers. Inner-ring diameters, d i, were 20, 40, 80, and 120 cm. Detailed numerical investigations were also conducted to explain how the inner-ring size of a double-ring infiltrometer influences the measured hydraulic conductivity in a heterogeneous soil. Field and simulation results both demonstrated that the variability in measured hydraulic conductivity was greater for smaller inner rings (e.g., d i <40 cm), and gradually decreased as the ring size increased. Our study indicates that where soil spatial variability is high, infiltrometers having a large inner ring (in general, d i >80 cm) are essential for reliable measurement.

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