2. Numerical Simulations of Water Flow and Solute Transport Applied to Acid Sulfate Soils

Rassam, Daud W.; Cook, F. J.

doi:10.1061/(asce)0733-9437(2002)128:2(107)

Cited by 18 publications

(7 citation statements)

References 9 publications

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“…The areas bounded by the ellipsoids 'a' and 'b' correspond to the approximate K s range previously reported for CASS landscapes in eastern Australia, where 'a' = McLeods Creek (e.g. White et al, 1993), Pimpama (Rassam and Cook, 2002), Broughton Creek (Blunden and Indraratna 2000) and 'b' = Shark Creek (Johnston et al, 2004a(Johnston et al, , 2005b, Partridge Creek (Aaso, 2004).…”

Section: Hydraulic Conductivity -Technique Applicationsupporting

confidence: 65%

“…A review of acid sulfate soil literature in Australia reveals that study sites situated in CASS landscapes with relatively low K s have attenuated lateral solute transport, both of acidity towards drains (Kinsela and Melville, 2004;Rassam and Cook, 2002) and of marine solutes away from drains (Indraratna et al, 2005). In contrast, at study sites with extremely high K s , the acid flux can be substantial and is highly sensitive to small changes in hydraulic gradients (Johnston et al, 2004a;Johnston et al, 2004b) and conversely, floodgate opening may cause marine solutes to rapidly penetrate many tens of meters into adjacent shallow groundwater (Johnston et al, 2005b).…”

Section: Discussionmentioning

confidence: 99%

“…The K s of sulfuric horizons plays a primary role in determining both the rates and hydrological pathways of acid flux in CASS (Cook et al, 1999;Rassam and Cook, 2002;Johnston et al, 2004a). Therefore, accurate knowledge of sulfuric horizon K s is critical in order to ensure appropriate design and implemention of acid management strategies.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Saturated hydraulic conductivity of sulfuric horizons in coastal floodplain acid sulfate soils: Variability and implications

et al. 2009

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Section: Hydraulic Conductivity -Technique Applicationsupporting

confidence: 65%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Saturated hydraulic conductivity of sulfuric horizons in coastal floodplain acid sulfate soils: Variability and implications

et al. 2009

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“…As a first step during the calibrations, the saturated hydraulic conductivity parameter (K sat ) and the saturated moisture content ( s ) being characterized as the most sensitive parameters (Rassam and Cook 2002), were manually calibrated to ensure that the numerical solutions converged by comparing the moisture content at the end of each simulation, and ensuring that the water balance error did not exceed 1%. The K sat and s values which resulted in the best fit between observed and simulated moisture content, for the leaching duration, were selected.…”

Section: Resultsmentioning

confidence: 99%

“…The HYDRUS model was recently used more frequently to characterize relatively complex flow and solute (nutrients and pesticides) transport processes at the field scale (Pang et al 2000;Rassam and Cook 2002;Phillips 2006). HYDRUS model deals with water and chemical transport processes with reasonable degree of accuracy (Sarmah et al 2005;Ying et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Estimating phosphorus leachability in reconstructed soil columns using HYDRUS-1D model

et al. 2011

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Modern agricultural production uses phosphorus (P) extensively to meet the challenges of feeding rapidly growing population and changing lifestyles, making P a leading source of impairment for rivers and streams in Canada. Developing effective management strategies to reduce P losses from agro-ecosystems requires improved understanding of P transport pathways in the soil. The purpose of this study was to investigate vertical distribution and transport processes of phosphate (PO 4 ) in reconstructed soil columns using HYDRUS-1D model. Results obtained from field experiments were used to calibrate and validate the HYDRUS-1D model. The results showed that 98% of the total P applied was concentrated in the top 0.2 m of the columns, and decreased progressively with soil depth. The model over-predicted PO 4 adsorption, leading to a weak correspondence between the simulated and the measured results for PO 4 . This is a suggestion that the HYDRUS-1D model could not account accurately for the different soil structures found in the undisturbed soil columns and the preferential flow that occurs in these columns. This may be due to the fact that Freundlich isotherm, which is part of the transport equations, could not adequately describe PO 4 adsorption onto the soil particles.

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Water and nitrate dynamics in safflower field lysimeters under different irrigation strategies, planting methods, and nitrogen fertilization and application of HYDRUS-1D model

Shahrokhnia

Sepaskhah

2018

Environ Sci Pollut Res

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World recent concerns about the shortage of water resources and contamination of groundwater supplies have motivated scientists seeking for more efficient techniques in irrigation and fertilization of farms while taking the advantage of models. The objective of this study is to address how water and nitrogen (N) dynamics are affected by efficient management strategies and to evaluate the application of HYDRUS-1D model in these conditions. In terms of using management policies, different irrigation strategies, planting methods, and different N fertilization rates applied on safflower (Carthamus tinctorius L.) in volumetric field lysimeters. The irrigation regimes were ordinary furrow irrigation (OFI) and variable alternate furrow irrigation (VAFI) as a partial root drying (PRD) technique. The planting methods were on-ridge planting (P1) and in-furrow planting (P2) methods. The fertilizer levels were 0 (N0), 100 (N1), and 200 (N2) kg ha of urea as 0, 46, and 92 kg N ha. Results showed that VAFI regime and in-furrow planting method favorably reduced the amount of drainage water below safflower root zone in comparison with the ordinary methods. Furthermore, VAFI regime satisfactorily decreased the seasonal nitrate (NO-N) leaching below the root zone, whereas differences between the leached NO-N in in-furrow and on-ridge planting methods were not significant. Moreover, VAFI regime did not show any negative effects on total N uptake in safflower seed and straw, whereas in-furrow planting accumulated higher N in comparison with the on-ridge planting method. In addition, safflower nitrogen (N) uptake was responsive to application of nitrogen, although the rate of increase in N accumulation was not significant between the application rates of 46 and 92 kg N ha. The soil nitrate concentration decreased during the growing season indicating that safflower root system has a great ability in absorption of NO-N from soil N supplies. HYDRUS-1D model favorably predicted the drainage water, nitrate concentration of drainage water, crop N uptake, and residual soil NO-N concentration for safflower field. Therefore, it can be an applicable model for prediction of water and nitrogen dynamics, despite of two-dimensional flow conditions in furrow irrigation. It was concluded that VAFI strategy and in-furrow planting method are suitable alternatives helping farmers produce food while conserving water and preserving the environment.

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2. Numerical Simulations of Water Flow and Solute Transport Applied to Acid Sulfate Soils

Cited by 18 publications

References 9 publications

Saturated hydraulic conductivity of sulfuric horizons in coastal floodplain acid sulfate soils: Variability and implications

Saturated hydraulic conductivity of sulfuric horizons in coastal floodplain acid sulfate soils: Variability and implications

Estimating phosphorus leachability in reconstructed soil columns using HYDRUS-1D model

Water and nitrate dynamics in safflower field lysimeters under different irrigation strategies, planting methods, and nitrogen fertilization and application of HYDRUS-1D model

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