Coats, K. H., and Smith, B. D., 1964. Dead-end pore volume and dispersion in porous media. Societ... more Coats, K. H., and Smith, B. D., 1964. Dead-end pore volume and dispersion in porous media. Society of Petroleum Engineers Journal, 1964, 73–84. Gwo, J. P., Jardine, P. M., Wilson, G. V., and Yeh, G. T., 1995. A multiple-pore-region concept to modeling mass transfer in subsurface media. Journal of Hydrology, 164, 217–237. Hillel, D., 1998. Environmental Soil Physics. San Diego: Academic. Jarvis, N. J., 1994. The MACRO Model (Version 3.1). Technical Description and Sample Simulations. Reports and Dissertations 19. Department of Soil Science. Uppsala: Swedish University of Agricultural Science, p. 51. Jury, W. A., and Horton, R., 2004. Soil Physics, 6th edn. Noboken: Wiley. Pfannkuch, O., 1963. Contribution a l’etude des deplacements de fluides miscibles dans un milieu poreux. Revue de l’Institut Francais du Petrole, 18, 215–268. Simůnek, J., van Genuchten, M. Th., and Sejna, M., 2005. The HYDRUS-1D Software Package for Simulating the Movement of Water, Heat, and Multiple Solutes in Variably Saturated Media. Version 3.0. Department of Environmental Sciences; University of California; Riverside Simůnek, J., Jarvis, N. J., van Genuchten, M. Th., and Gardenas, A., 2003. Review and comparison of models for describing nonequilibrium and preferential flow and transport in the vadose zone. Journal of Hydrology, 272, 14–35. Vanderborght, J., and Vereecken, H., 2007. Review of dispersivities for transport modeling in soils. Vadose Zone Journal, 6, 29–52.
Rising saline groundwatertables and drought in the Lower Murray Reclaimed Irrigation Area (LMRIA)... more Rising saline groundwatertables and drought in the Lower Murray Reclaimed Irrigation Area (LMRIA) has created soil salinity and sodicity conditions, which has resulted in a decline in agricultural production. A 2 month field experiment was conducted at Mobilong irrigation area using a randomised block design with trial plots (4m2) in each of the three blocks containing the following six treatments: (1) control (not irrigated), (2) irrigation (River Murray water) only, (3) gypsum application (1.5 kg/m2) and irrigation, (4) limestone application (1.5 kg/m2) and irrigation, (5) seawater (source of dissolved Ca2+) application (100mm depth) and irrigation and (6) acid (pH 3) drainage (to dissolve CaCO3 in soil to release Ca2+) application (100mm irrigation water depth) and irrigation. Soil electrical conductivity (EC), pH, exchangeable cations (Ca2+, Mg2+, Na+, K+), exchangeable sodium percentage (ESP) and saturated hydraulic conductivity were measured. The decrease in EC was greatest in...
Realistic assessment of likely acid generation during any proposed disturbance or construction in... more Realistic assessment of likely acid generation during any proposed disturbance or construction in Acid Sulfate Soils requires knowledge of rate of oxygen transport to pyrite in soils and realistic insitu pyrite oxidation rates. It is clear that in many instances pyrite oxidation is rate limited by oxygen supply and retarding oxygen transport is an efficient management tool for reducing acid risk. On many construction sites it is not practical to retard oxygen transport into exposed soils but for given soil textures, where oxygen diffusion is limited by free drained porosity and pore space connectivity, pyrite oxidation rates may be substantially reduced by bacteriological reactions and organic matter which both modify the net reaction mechanisms and compete for available oxygen. Experimental investigation of pyritic soil fines in water suspensions under controlled conditions are beginning to yield detailed results. The results from these early experimental runs, derived while refini...
Disturbed acid sulphate soils are potent sources of acidity in coastal waterways. Monitoring stud... more Disturbed acid sulphate soils are potent sources of acidity in coastal waterways. Monitoring studies of the drainage water for sites at East Trinity, Cairns and Pimpama, south-east Queensland indicate that considerable acidity is found in the drainage water from these sites. Hydrogen (H+), ferrous (Fe2+) and aluminium (Al) ions are the dominant acid cations involved. When drainage water is mixed
Improving solute(salt, nutrient, chemical) management to minimise environmental impacts of irriga... more Improving solute(salt, nutrient, chemical) management to minimise environmental impacts of irrigation. KL Bristow, CM Cote, JW Hopmans, Ph B Charlesworth, FJ Cook, PJ Thorburn International Water and Irrigation 23:11, 34-37, 2003. ...
Data collection from Logan's Dam near Gatton includes: thermistor chain data (x4), land weath... more Data collection from Logan's Dam near Gatton includes: thermistor chain data (x4), land weather stations (x4), floating weather station (x1) scintillometer data for fluxes, pump station data, rain gauges (x4), datalogger and data description files.
Under changing climate conditions with expected higher risks on long periods of severe drought ev... more Under changing climate conditions with expected higher risks on long periods of severe drought events, acid sulphate soils have a higher risk for acidification when exposed to oxygen under a falling water table. A regional or continental risk map for acidification under possible future climate scenarios is one of the tools for evaluating agricultural, economic and environmental impacts of acidification. In a first phase of the development of such risk map, a simulation model has to be developed accounting for (i) the effect of changing meteorological boundary conditions on the water dynamics inside the soil and the ground water depth, (ii) diffusion of oxygen inside the soil profile, and (iii) kinetic dissolution of pyrite and geochemical alterations. The objective of this study is to identify key processes, model structures and parameters dominating the acidification during prolonged drought events and the neutralizing capacities after these events. The simulation tool HPx (Jacques...
Earlier studies have shown that the biological oxygen demand (BOD5) of water that has been in con... more Earlier studies have shown that the biological oxygen demand (BOD5) of water that has been in contact with sugar juice, sugarcane trash and in runoff water from sugar-cane fields can be very high. The development of management strategies that minimise the impact of runoff water from sugarcane fields requires an understanding of the rate of breakdown of sugar and trash, and how this may be changed by environmental factors (such as water content) and degree of contact with the soil. This study presents further data on the BOD5 of the runoff water following harvest for two cane growing areas, Burdekin (3 sites) and Pimpama (1 site). The data show that, following harvest, the BOD5 in the water can be substantial even 51 days after harvesting. Studies were undertaken in the laboratory with soil from one site in the Burdekin (Rita Island) to investigate the effect of trash incorporation and soil water contents on soil respiration and the rate of disappearance of water-soluble carbohydrate...
Coats, K. H., and Smith, B. D., 1964. Dead-end pore volume and dispersion in porous media. Societ... more Coats, K. H., and Smith, B. D., 1964. Dead-end pore volume and dispersion in porous media. Society of Petroleum Engineers Journal, 1964, 73–84. Gwo, J. P., Jardine, P. M., Wilson, G. V., and Yeh, G. T., 1995. A multiple-pore-region concept to modeling mass transfer in subsurface media. Journal of Hydrology, 164, 217–237. Hillel, D., 1998. Environmental Soil Physics. San Diego: Academic. Jarvis, N. J., 1994. The MACRO Model (Version 3.1). Technical Description and Sample Simulations. Reports and Dissertations 19. Department of Soil Science. Uppsala: Swedish University of Agricultural Science, p. 51. Jury, W. A., and Horton, R., 2004. Soil Physics, 6th edn. Noboken: Wiley. Pfannkuch, O., 1963. Contribution a l’etude des deplacements de fluides miscibles dans un milieu poreux. Revue de l’Institut Francais du Petrole, 18, 215–268. Simůnek, J., van Genuchten, M. Th., and Sejna, M., 2005. The HYDRUS-1D Software Package for Simulating the Movement of Water, Heat, and Multiple Solutes in Variably Saturated Media. Version 3.0. Department of Environmental Sciences; University of California; Riverside Simůnek, J., Jarvis, N. J., van Genuchten, M. Th., and Gardenas, A., 2003. Review and comparison of models for describing nonequilibrium and preferential flow and transport in the vadose zone. Journal of Hydrology, 272, 14–35. Vanderborght, J., and Vereecken, H., 2007. Review of dispersivities for transport modeling in soils. Vadose Zone Journal, 6, 29–52.
Rising saline groundwatertables and drought in the Lower Murray Reclaimed Irrigation Area (LMRIA)... more Rising saline groundwatertables and drought in the Lower Murray Reclaimed Irrigation Area (LMRIA) has created soil salinity and sodicity conditions, which has resulted in a decline in agricultural production. A 2 month field experiment was conducted at Mobilong irrigation area using a randomised block design with trial plots (4m2) in each of the three blocks containing the following six treatments: (1) control (not irrigated), (2) irrigation (River Murray water) only, (3) gypsum application (1.5 kg/m2) and irrigation, (4) limestone application (1.5 kg/m2) and irrigation, (5) seawater (source of dissolved Ca2+) application (100mm depth) and irrigation and (6) acid (pH 3) drainage (to dissolve CaCO3 in soil to release Ca2+) application (100mm irrigation water depth) and irrigation. Soil electrical conductivity (EC), pH, exchangeable cations (Ca2+, Mg2+, Na+, K+), exchangeable sodium percentage (ESP) and saturated hydraulic conductivity were measured. The decrease in EC was greatest in...
Realistic assessment of likely acid generation during any proposed disturbance or construction in... more Realistic assessment of likely acid generation during any proposed disturbance or construction in Acid Sulfate Soils requires knowledge of rate of oxygen transport to pyrite in soils and realistic insitu pyrite oxidation rates. It is clear that in many instances pyrite oxidation is rate limited by oxygen supply and retarding oxygen transport is an efficient management tool for reducing acid risk. On many construction sites it is not practical to retard oxygen transport into exposed soils but for given soil textures, where oxygen diffusion is limited by free drained porosity and pore space connectivity, pyrite oxidation rates may be substantially reduced by bacteriological reactions and organic matter which both modify the net reaction mechanisms and compete for available oxygen. Experimental investigation of pyritic soil fines in water suspensions under controlled conditions are beginning to yield detailed results. The results from these early experimental runs, derived while refini...
Disturbed acid sulphate soils are potent sources of acidity in coastal waterways. Monitoring stud... more Disturbed acid sulphate soils are potent sources of acidity in coastal waterways. Monitoring studies of the drainage water for sites at East Trinity, Cairns and Pimpama, south-east Queensland indicate that considerable acidity is found in the drainage water from these sites. Hydrogen (H+), ferrous (Fe2+) and aluminium (Al) ions are the dominant acid cations involved. When drainage water is mixed
Improving solute(salt, nutrient, chemical) management to minimise environmental impacts of irriga... more Improving solute(salt, nutrient, chemical) management to minimise environmental impacts of irrigation. KL Bristow, CM Cote, JW Hopmans, Ph B Charlesworth, FJ Cook, PJ Thorburn International Water and Irrigation 23:11, 34-37, 2003. ...
Data collection from Logan's Dam near Gatton includes: thermistor chain data (x4), land weath... more Data collection from Logan's Dam near Gatton includes: thermistor chain data (x4), land weather stations (x4), floating weather station (x1) scintillometer data for fluxes, pump station data, rain gauges (x4), datalogger and data description files.
Under changing climate conditions with expected higher risks on long periods of severe drought ev... more Under changing climate conditions with expected higher risks on long periods of severe drought events, acid sulphate soils have a higher risk for acidification when exposed to oxygen under a falling water table. A regional or continental risk map for acidification under possible future climate scenarios is one of the tools for evaluating agricultural, economic and environmental impacts of acidification. In a first phase of the development of such risk map, a simulation model has to be developed accounting for (i) the effect of changing meteorological boundary conditions on the water dynamics inside the soil and the ground water depth, (ii) diffusion of oxygen inside the soil profile, and (iii) kinetic dissolution of pyrite and geochemical alterations. The objective of this study is to identify key processes, model structures and parameters dominating the acidification during prolonged drought events and the neutralizing capacities after these events. The simulation tool HPx (Jacques...
Earlier studies have shown that the biological oxygen demand (BOD5) of water that has been in con... more Earlier studies have shown that the biological oxygen demand (BOD5) of water that has been in contact with sugar juice, sugarcane trash and in runoff water from sugar-cane fields can be very high. The development of management strategies that minimise the impact of runoff water from sugarcane fields requires an understanding of the rate of breakdown of sugar and trash, and how this may be changed by environmental factors (such as water content) and degree of contact with the soil. This study presents further data on the BOD5 of the runoff water following harvest for two cane growing areas, Burdekin (3 sites) and Pimpama (1 site). The data show that, following harvest, the BOD5 in the water can be substantial even 51 days after harvesting. Studies were undertaken in the laboratory with soil from one site in the Burdekin (Rita Island) to investigate the effect of trash incorporation and soil water contents on soil respiration and the rate of disappearance of water-soluble carbohydrate...
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