Simultaneous scaling of soil water retention and unsaturated hydraulic conductivity functions assuming lognormal pore-size distribution

Tuli, Ataç; Kosugi, Ken’ichiro; Hopmans, Jan W.

doi:10.1016/s0309-1708(00)00070-1

Cited by 64 publications

(79 citation statements)

References 21 publications

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“…The measured heterogeneity for the unsaturated hydraulic conductivity was smaller than the values measured by Tuli et al (2001) and much smaller than the values for the saturated conductivity measured by Mallants et al (1996). Kelleners et al (1999) measured scaling factors with standard deviations about three times larger than those in our experiment.…”

Section: Scaled Values a Bcontrasting

confidence: 83%

“…Deurer et al (2000) and Mallant et al (1996) came to similar results for the water retention as well. Tuli et al (2001) measured slightly higher variances of the scaling factors. Matric potential (cm)…”

Section: Results and Discusionmentioning

confidence: 91%

“…Rockhold et al (1996) applied it successfully for simulation of the water flow and tritium transport. Tuli et al (2001) applied a physically based scaling approach of Kosugi and Hopmans (1998) on 143 soil samples. They were able to show that the theoretical interpretation of a log normal distribution of scaling factors was applicable to the simultaneous scaling of hydraulic functions.…”

Section: Introductionmentioning

confidence: 99%

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Scaling the Hydraulic Functions of A Water Repellent Sandy Soil

Stoffregen¹,

Wessolek²

2014

International Agrophysics

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A b s t r a c t. The heterogeneity of both unsaturated hydraulic conductivity and water retention was measured with a high spatial resolution on a transect using an evaporation method. Fifteen undisturbed 100 cm 3 soil cores were taken on a transect every 10 cm from the topsoil of a water repellent sandy site. Five dynamic water retention curves and four unsaturated conductivity curves were determined for each core. We conducted measurements without further saturation in the laboratory in order to achieve field-like conditions. The initial water contents were heterogeneous, indicating different hysteretic conditions and water repellent areas. The scattering of the water retention curves was high, while the heterogeneity of unsaturated conductivity curves was unexpectedly low. Two scaling approaches were used to describe the heterogeneity: one with and one without considering hysteresis. The concept of scaling applies well to describing the heterogeneity of both hydraulic functions. Including hysteresis leads to similar results than excluding hysteresis. The distribution of the hydraulic conductivity and the water retention were independent from each other. The results give important information for numerical simulation of the water flow with heterogeneous hydraulic functions.K e y w o r d s: scaling, hydraulic conductivity, water retention, hysteresis, water repellency

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Section: Scaled Values a Bcontrasting

confidence: 83%

Section: Results and Discusionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Scaling the Hydraulic Functions of A Water Repellent Sandy Soil

Stoffregen¹,

Wessolek²

2014

International Agrophysics

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“…3.2 AP-scaling method Nasta et al (2009) (Tuli et al 2001). The AP-PTF postulates the fundamental hypothesis of shape similarity between the measured particle-size distribution and the soil water retention function.…”

Section: Lab-scaling Methodsmentioning

confidence: 99%

“…The scaling approach has been developed as an effective method for a stochastic description of the spatial variability of the soil hydraulic properties over a certain area (Hopmans and Stricker 1989, Kosugi and Hopmans 1998, Tuli et al 2001). This approach is based on the assumption that geometrically similar porous media (Miller and Miller 1956, Figure 2) differ only by a characteristic length of their poresize distributions, which in turn are related to the soil hydraulic properties.…”

Section: Introductionmentioning

confidence: 99%

Functional evaluation of a simplified scaling method for assessing the spatial variability of soil hydraulic properties at the hillslope scale

Nasta

Romano

Chirico

2013

Hydrological Sciences Journal

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Soil Water Flow at Different Spatial Scales

Hopmans¹,

Schoups²

2005

Encyclopedia of Hydrological Sciences

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A major challenge in hydrological sciences is the modeling of flow and transport processes and their measurement across a range of spatial or temporal scales. Such needs arise, for example, when watershed processes must be determined from soil hydrological data collected from a limited number of in situ field measurements or analysis of small soil cores in the laboratory. The scaling problem cannot be solved by simple consideration of the differences in space or timescale, for several reasons. First, spatial and temporal variability in soil hydrological properties create uncertainties when changing between scales. Second, flow and transport processes in vadose zone hydrology are highly nonlinear. As a result, vadose zone properties are nonunique and scale‐dependent, resulting in effective properties that vary across spatial scales and merely serve as calibration parameters in hydrologic models. Therefore, their estimation for heterogeneous materials can only be accomplished using scale‐appropriate measurements and models. We present examples of soil water flow at the pore, local, and regional scales. The inherent complexity of flow in heterogeneous soils, and the need to integrate theory with experiment, requires innovative and multidisciplinary research efforts to overcome limitations imposed by current understanding of scale‐dependent soil water flow and transport processes.

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Simultaneous scaling of soil water retention and unsaturated hydraulic conductivity functions assuming lognormal pore-size distribution

Cited by 64 publications

References 21 publications

Scaling the Hydraulic Functions of A Water Repellent Sandy Soil

Scaling the Hydraulic Functions of A Water Repellent Sandy Soil

Functional evaluation of a simplified scaling method for assessing the spatial variability of soil hydraulic properties at the hillslope scale

Soil Water Flow at Different Spatial Scales

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