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Determining the frequency, depth and velocity of preferential flow by high frequency soil moisture monitoring

Citation

Hardie, M and Lisson, S and Doyle, R and Cotching, W, Determining the frequency, depth and velocity of preferential flow by high frequency soil moisture monitoring, Journal of Contaminant Hydrology, 144, (1) pp. 66-77. ISSN 0169-7722 (2013) [Refereed Article]

Copyright Statement

Crown Copyright 2012 Published by Elsevier B.V.

DOI: doi:10.1016/j.jconhyd.2012.10.008

Abstract

Preferential flow in agricultural soils has been demonstrated to result in agrochemical mobilisation to shallowgroundwater. Landmanagers and environmental regulators need simple cost effective techniques for identifying soil land use combinations in which preferential flow occurs. Existing techniques for identifying preferential flowhave a range of limitations including; often being destructive, non in situ, small sampling volumes, or are subject to artificial boundary conditions. This study demonstrated that high frequency soil moisture monitoring using a multi-sensory capacitance probe mounted within a vertically rammed access tube, was able to determine the occurrence, depth, and wetting front velocity of preferential flow events following rainfall. Occurrence of preferential flow was not related to either rainfall intensity or rainfall amount, rather preferential flow occurred when antecedent soil moisture content was below 226 mm soil moisture storage (070 cm). Results indicate that high temporal frequency soil moisture monitoring may be used to identify soil type land use combinations in which the presence of preferential flow increases the risk of shallow groundwater contamination by rapid transport of agrochemicals through the soil profile. However use of high frequency based soil moisture monitoring to determine agrochemical mobilisation risk may be limited by, inability to determine the volume of preferential flow, difficulty observing macropore flow at high antecedent soil moisture content, and creation of artificial voids during installation of access tubes in stony soils.

Item Details

Item Type:Refereed Article
Keywords:antecedent soil moisture, soil moisture probe, finger flow, macropore flow, hydrophobic, agrochemical mobilisation
Research Division:Environmental Sciences
Research Group:Soil Sciences
Research Field:Land Capability and Soil Degradation
Objective Division:Environment
Objective Group:Land and Water Management
Objective Field:Farmland, Arable Cropland and Permanent Cropland Water Management
Author:Hardie, M (Mr Marcus Hardie)
Author:Lisson, S (Dr Shaun Lisson)
Author:Doyle, R (Dr Richard Doyle)
Author:Cotching, W (Dr Bill Cotching)
ID Code:76475
Year Published:2013
Web of Science® Times Cited:14
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2012-03-06
Last Modified:2014-04-03
Downloads:0

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