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Related Experiment Video

Updated: May 9, 2026

Wastewater Irrigation Impacts on Soil Hydraulic Conductivity: Coupled Field Sampling and Laboratory Determination of Saturated Hydraulic Conductivity

Wastewater Irrigation Impacts on Soil Hydraulic Conductivity: Coupled Field Sampling and Laboratory Determination of Saturated Hydraulic Conductivity

Published on: August 19, 2018

Physically based closed-form expression for the bimodal unsaturated hydraulic conductivity function.

Shiyu Liu¹, Noriyuki Yasufuku, Qiang Liu

¹Geotechnical Engineering Research Group, Faculty of Engineering, Kyushu University, Fukuoka, 819-0395, Japan. liushiyu518@gmail.com

Water Science and Technology : a Journal of the International Association on Water Pollution Research

|July 19, 2013

Summary

Accurate soil hydraulic properties are crucial for simulating water flow and contaminant transport in complex soils. This study proposes a new physically based model for bimodal unsaturated hydraulic conductivity, showing good agreement with experimental data.

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Area of Science:

Environmental science
Soil science
Hydrogeology

Background:

Accurate parameterization of soil hydraulic properties is essential for modeling water flow and contaminant transport in the vadose zone.
Complex soil structures pose significant challenges for existing models.

Purpose of the Study:

To propose a physically based, closed-form expression for bimodal unsaturated hydraulic conductivity functions.
To develop a model applicable to soils with bimodal pore-size distributions.

Main Methods:

Combined Liu's bimodal soil-water characteristic curve (SWCC) representation with Mualem's conductivity model.
Defined parameters with physical significance related to material properties.
Validated the proposed functions using experimental data for bimodal SWCCs and hydraulic conductivity.

Main Results:

The proposed equations accurately represent bimodal soil hydraulic properties.
The model demonstrated good agreement with experimental data.
Physically significant parameters were identified.

Conclusions:

The developed functions provide an effective tool for characterizing hydraulic properties in complex soil structures.
Potential applications include improved vadose zone simulations and contaminant transport modeling.
The model aids in identifying hydraulic porosities in heterogeneous media.