Sex: Male
Education:
- Doctor of Philosophy in Biological and Environmental Science, Saitama University Japan
Field of Specialization
Soil analysis
Soil and water conservation
Soil Physics
Water quality
Researches:
Article title: Soil Specific Surface Area and Non-Singularity of Soil-Water Retention at Low Saturations
Authors: Emmanuel Arthur, Markus Tuller, Per Moldrup, Augustus C. Resurreccion
Publication title: Soil Science Society of America Journal 77(1):43-53, January 2013
Abstract:
The dry end of the soil water characteristic (SWC) is important for modeling vapor flow dynamics and predicting soil properties such as specific surface area (SSA) and clay content (CL). Verification of new instrumentation for rapid measurement of the dry end of the SWC is relevant to avoid long equilibration times and potential for hydraulic decoupling. The objectives of this study were to measure both adsorption and desorption branches of the dry end of the SWC for 21 variably-textured Arizona soils using new, fully automated instrumentation (AquaSorp); apply the data to parameterize the Tuller and Or (TO) and new single-parameter non-singularity (SPN) models; and evaluate estimates of SSA from water sorption, ethylene glycol monoethyl ether (EGME), and N2–BET methods. The AquaSorp successfully measured water sorption isotherms (∼140 data points) within a reasonably short time (1–3 d). The SPN model well described the distinct non-singularity between the adsorption and desorption branches, while the TO model captured the adsorption data reasonably well (<5% deviation from measurements), except for matric potentials below –200 MPa. The SSA derived from water sorption and the TO model were comparable to SSAEGME for all soils. The matric potential at “zero” water content was confirmed as the widely accepted value of around –800 MPa. A non-singularity coefficient based on water adsorption at monolayer coverage was positively correlated with CL. Obtained results show the potential of the AquaSorp to accurately measure the dry region of the SWC, providing a rapid determination of SSA.
Full text available upon request to the author
Article title: Relationship between specific surface area and the dry end of the water retention curve for soils with varying clay and organic carbon contents
Authors: Augustus C. Resurreccion, Per Moldrup, Markus Tuller, Ty P. A. Ferré, et al.
Publication title: Water Resources Research 47(W06522), June 2011
Abstract:
Accurate description of the soil water retention curve (SWRC) at low water contents is important for simulating water dynamics and biochemical vadose zone processes in arid environments. Soil water retention data corresponding to matric potentials of less than -10 MPa, where adsorptive forces dominate over capillary forces, have also been used to estimate soil specific surface area (SA). In the present study, the dry end of the SWRC was measured with a chilled-mirror dew point psychrometer for 41 Danish soils covering a wide range of clay (CL) and organic carbon (OC) contents. The 41 soils were classified into four groups on the basis of the Dexter number (n = CL/OC), and the Tuller-Or (TO) general scaling model describing water film thickness at a given matric potential (<-10 MPa) was evaluated. The SA estimated from the dry end of the SWRC (SA-SWRC) was in good agreement with the SA measured with ethylene glycol monoethyl ether (SA-EGME) only for organic soils with n > 10. A strong correlation between the ratio of the two surface area estimates and the Dexter number was observed and applied as an additional scaling function in the TO model to rescale the soil water retention curve at low water contents. However, the TO model still overestimated water film thickness at potentials approaching ovendry condition (about -800 MPa). The semi-log linear Campbell-Shiozawa-Rossi- Nimmo (CSRN) model showed better fits for all investigated soils from -10 to -800 MPa and yielded high correlations with CL and SA. It is therefore recommended to apply the empirical CSRN model for predicting the dry part of the water retention curve (-10 to -800 MPa) from measured soil texture or surface area. Further research should aim to modify the more physically based TO model to obtain better descriptions of the SWRC in the very dry range (-300 to -800 MPa).
Full text link: https://tinyurl.com/ny3d7x3p
Article title: Hierarchical, Bimodal Model for Gas Diffusivity in Aggregated, Unsaturated Soils
Authors: Augustus C. Resurreccion, Per Moldrup, Ken Kawamoto, Shoihciro Hamamoto, et al.
Publication title: Soil Science Society of America Journal 74(2), March 2010
Abstract:
The soil gas diffusion coefficient (D(p)) and its dependency on soil air content, epsilon, and tortuosity-connectivity of the air-filled pore networks control the transport and fate of gaseous-phase contaminants in variably saturated soil. The bimodality in pore size distribution of structured soil often yields a variation of D(p) with epsilon in the intraaggregate pore region that is distinctly different from that in the interaggregate region. Data imply a highly nonlinear behavior of soil gas diffusivity, D(p)(epsilon)/D(o) (where D(o) is the gas diffusion coefficient in free air), in the interaggregate region of aggregated soils similar to that of structureless soils with a unimodal pore size distribution, probably due to diffusion-limiting effects by connected water films at low epsilon. In contrast, for the intraaggregate region, we show that the impedance factor F* (= D(p)/epsilon D(o)) and tortuosity factor T [= (1/F*)(1/2)] are approximately constant for most soil media. We suggest a typically well-defined separation between the two pore regions at the minimum for the pore connectivity factor X* [= log(D(p)/D(o))/log(epsilon)], at which point the interaggregate pores are devoid of water while the intraaggregate pore region is water saturated. Based on this, a hierarchical two independent region (TIR) D(p)/D(o) model was developed by applying a cumulative series of Buckingham-Currie power-law functions, F epsilon(X). A nonlinear, water-content-dependent. expression for F best described the measured D(p)/D(o) in the interaggregate region, while constant F (around 0-5) and X(around 1) generally sufficed for the intraaggregate region. The TIR model better predicted gas diffusivities for both aggregate fractions and highly structured soils across the entire range of moisture conditions with MISE reduced by two to five times compared with traditional predictive D(p)(epsilon)/D(o) models.
Full text available upon request to the author
Article title: The Solute Diffusion Coefficient in Variably Compacted, Unsaturated Volcanic Ash Soils
Authors: Shoihciro Hamamoto, Samintha Perera, Augustus C. Resurreccion, Ken Kawamoto, et al.
Publication title: Vadose Zone Journal 8(4), November 2009
Abstract:
The solute diffusion coefficient in soil (D(s)) and its dependency on the soil water content (theta), soil type, and compaction govern the transport and fate of dissolved chemicals in the soil vadose zone. Only a few studies have quantified solute diffusivity (D(s)/D(0), where D(s) and D(0) are the solute diffusion coefficients in soil and pure water, respectively) for variably compacted soils with different textures. We measured the D(s) for KCI on five different soils from Japan: two volcanic ash soils (Andisols) at different bulk densities, two sandy soils, and a loamy soil. The D(s) was measured across a wide range of theta using the half-cell method. The D(s)/D(0) values for Andisols with bimodal pore size distribution were comparatively lower than for the other soils. Opposite to the behavior for sandy soils, the D(s)/D(0) for Andisols at a given theta decreased markedly with increasing bulk density under wet conditions but Increased with increasing bulk density under dry conditions. Data for all soil types including sandy soils with unimodal pore size distribution implied a two-region behavior when plotted as log(D(s)/D(0)) vs. theta. We suggest that the similar behavior across soil types can be explained by regions of low and high water phase connectivity for relatively structureless soils and by high Intraaggregate and low interaggregate water phase tortuosity for aggregated soils. Among a number of tested predictive models for D(s)/D(0), the Penman-Millington-Quirk model, which requires knowledge of only theta and total porosity, performed best across soil types.
Full text available upon request to the author
Article title: Variable Pore Connectivity Factor Model for Gas Diffusivity in Unsaturated, Aggregated Soil
Authors: Augustus C. Resurreccion, Ken Kawamoto, Per Moldrup, Seiko Yoshikawa, et al.
Publication title: Vadose Zone Journal 7(2), May 2008
Abstract:
The soil gas diffusion coefficient (D(p)) and its variations with soil air content (epsilon) and soil water matric potential (psi) control vadose zone transport and emissions of volatile organic chemicals and greenhouse gases. This study revisits the 1904 Buckingham power-law model where D(p) is proportional to E with X characterizing the tortuosity and connectivity of air-filled pore space. One hundred years later, most models linking D(p) (epsilon) to Soil water retention and pore size distribution still assume that the pore connectivity factor, X, is a constant for a given soil. We show that X varies strongly with both epsilon and matric potential [given as pF = log(psi, cm H(2)O)] for individual soils ranging from undisturbed sand to aggregated volcanic ash soils (Andisols). For Andisols with bimodal pore size distribution, the X-pF function appears symmetrical. The minimum X value is typically around 2 and was observed close to psi of -1000 cm H(2)O (pF 3) when inter-aggregate voids are drained. To link D(p) with bimodal pore size distribution, we coupled a two-region van Genuchten soil water retention model with the Buckingham D(p) (epsilon) model, assuming X to vary symmetrically around a given pF. The coupled model well described D(p) as a function of both epsilon and psi for both repacked and undisturbed Andisols and for other soil types. By merely using average values of the three constants in the proposed symmetrical X-pF expression, predictions of D(p) were better than with traditional models.
Full text available upon request to the author
Article title: Linear Model to Predict Soil-Gas Diffusivity from Two Soil-Water Retention Points in Unsaturated Volcanic Ash Soils
Authors: Augustus C. Resurreccion, Toshiko Komatsu, Ken Kawamoto, Masanobu Oda, et al.
Publication title: SOILS AND FOUNDATIONS 48(3):397-406, June 2008
Abstract:
Risk assessment and design of remediation methods at soil sites polluted with gaseous phase contaminant require an accurate description of soil-gas diffusion coefficient (Dp) which is typically governed by the variations in soil air-filled porosity (va). For undisturbed volcanic ash soils, recent studies have shown that a linear Dp(va) model, taking into account inactive air-filled pore space (threshold soil-air content, va, th) captured the Dp data across the total soil moisture range from wet to completely dry conditions. In this study, we developed a simple, easy to apply, and still accurate linear D p(Va) model for undisturbed volcanic ash soils. The model slope C and intercept (interpreted as (va, th) were derived using the classical Buckingham (1904) Dp(va) power-law model, vaX, at two soil-water matric potentials of pF 2 (near field capacity condition) and pF 4.1 (near wilting point condition), and assuming the same value for the Buckingham exponent (X=2.3) in agreement with measured data. This linear Dp(va) prediction model performed better than the traditionally-used non-linear Dp(v a) models, especially at dry soil conditions, when tested against several independent data sets from literature. Model parameter sensitivity analysis on soil compaction effects showed that a decrease in slope C and v a, th due to uniaxial reduction of air-filled pore space in between aggregates markedly affects the magnitude of soil-gas diffusivity. We recommend the new Dp(va) model using only the soil-air contents at two soil-water matric potential conditions (field capacity and wilting point) for a rapid assessment of the entire Dp-vafunction.
Full text available upon request to the author
Article title: Solute Diffusivity of Repacked Volcanic Ash Soil: Effect of Changes in Pore Size Distribution due to Soil Compaction
Authors: Samintha Perera, Augustus C. Resurreccion, Ken Kawamoto, T. Komatsu, et al.
Publication title: not stated
Abstract:
Diffusion is the dominant spreading mechanism of contaminants dissolved in soil-water in the absence of soil- water flow. Solute diffusion coefficient, Ds, is a key parameter in investigating the fate and transport of contaminants from a polluted soil site. However, only a few studies on quantifying Ds as a function of soil- water content were done, especially for aggregated soils with a dual pore system such as volcanic ash soils (Andisols). In this study, we investigated the effect of bulk density on pore size distribution, and, consequently, on solute diffusivity (Ds/Do, where Do is the solute diffusion coefficient in pure water) in repacked volcanic ash soil taken at 5-10 cm depth at a pasture site in Nishi-Tokyo, Japan. Measurements of Ds were done on sieved and repacked soil at three bulk densities (0.62 g cm-3 , 0.7 g cm-3, and 0.8 g cm-3 ) and at three soil moisture conditions at pF (= log (-psi; soil-water matric potential in cm H2O)) 1.8, 2, and 3 for each bulk density. Half-cell method was used to measure Ds where the source and sink half cells (each cell of 10-cm length and 4.9 cm in diameter) were joined together and the concentration profile was analyzed after a substantial time to determine Ds. Results showed that at a particular bulk density, Ds decreased with decreasing degree of saturation. This is expected since as the soil becomes drier, water films become disconnected resulting in a decrease in Ds. On the other hand, at a particular degree of saturation, the magnitude of Ds considerably decreases with increasing dry bulk density. As soil is compacted (and thus the increase in bulk density), the observed pore size distribution obtained from soil-water retention curve changes where the mainly inter-aggregate large pores become smaller and soil particles become closer to each other. This reduction in inter-aggregate pore size likely increases the liquid-phase tortuosity resulting in the decrease in Ds/Do at soil-water content at pF < 3. The soil-water retention point at pF 3 was observed to be the separation between the inter- and intra-aggregate pore space regions, where the inter- aggregate pore space was completely drained. Thus at pF close to 3, the difference of Ds/Do among three bulk densities becomes smaller, probably due to high possibility to ensure continuous water pathways among intra-aggregate pores caused by inter-connection of aggregate. Although volcanic ash soils are distributed across around 0.84% of the earth's land surface, only a limited number of studies about solute diffusion for Andisols are available as compared to numerous studies on water permeability (liquid-phase convection parameter). Therefore, this study contributes to a valuable data set of solute diffusion coefficient for volcanic ash soils.
Full text available upon request to the author
Article title: Gas Diffusivity and Air Permeability in A Volcanic Ash Soil Profile: Effects of Organic Matter and Water Retention
Authors: Augustus C. Resurreccion, Ken Kawamoto, Toshiko Komatsu, Per Moldrup, et al.
Publication title: Soil Science 172(6):432-443, June 2007
Abstract:
The soil-gas diffusion coefficient (Dp) and air permeability (ka) govern the transport and emission of greenhouse gases and volatile organic chemicals in the unsaturated zone. The effects of soil organic matter and water retention on the two gas transport parameters are not well known. In this study, we measured Dp and ka in three depths of a volcanic ash soil (Andisol) profile, with organic matter contents of 17% (0-5 cm depth), 4.7% (15-20 cm), and 0.2% (55-60 cm), respectively. Measurements were made on undisturbed samples at soil-water matric potentials from ψ = -10 cm H2O (pF 1) to -12,600 cm H2O (pF 4.1) and, for Dp, also on air- and oven-dried samples. Soil-water retention was larger in the low-organic layer (55-60 cm) and similar for the other 2 organic layers. Soil-gas diffusivity varied the most in the high-organic top layer (0-5 cm) and was lower for samples with total porosity exceeding 0.8 m3 m-3 likely because of additional inactive air-filled pore space created by interconnected water films. The threshold air-filled porosity (ϵth) where Dp approached zero was on the average 0.05 m3 m-3 higher in the high-organic top layer (ϵth around 0.2 m3 m-3) compared with the lower layers. For air permeability, the low-organic layer (55-60 cm) behaved differently because of a different soil structure. A recent power law ka(ϵ) model compared well with data between pF 1 and pF 3 but typically underestimated ka at pF 4.1 because of a sudden increase in pore connectivity. A recent linear Dp(ϵ) model for Andisols is further developed, with ϵth and model slope C predicted from soil total porosity and volumetric content of intra-aggregate pores (soil-water content at pF 3). The linear model performed better than frequently used nonlinear Dp(ϵ) models, especially at low soil-water contents.
Full text available upon request to the author
Article title: Gas Transport Parameters Along Field Transects of A Volcanic Ash Soil
Authors: Augustus C. Resurreccion, Ken Kawamoto, Toshiko Komatsu, Per Moldrup, et al.
Publication title: Soil Science 172(1):3-16, January 2007
Abstract:
Variations in gas transport parameters at the field scale govern the transport, fate, and emission of greenhouse gases and volatile organic chemicals in soil. In this study, we evaluated predictive models for soil-gas diffusivity (Dp/Do) and air permeability (ka) based on measurements along a 117-m transect and a parallel 33-m transect of a humic volcanic ash soil (Andisol) in Nishi-Tokyo, Japan. Measurements were done on 100-cm3 undisturbed soil samples, with 3-m spacing between sampling points, and included water retention, soil-gas diffusion coefficient (Dp), ka at different soil-water matric potentials, and saturated hydraulic conductivity. Traditionally used predictive gas diffusivity models underestimated Dp/Do in wet soil and largely overestimated Dp/Do under dry conditions because of soil aggregation effects. A linear model for Dp/Do as a function of air-filled porosity (ϵ), taking into account inactive/remote air-filled pore space, accurately described Dp(ϵ)/Do from wet to oven-dry conditions and well captured the spatial variations in Dp/Do along the transects. The ka exhibited a nonlinear relation with ϵ, and ka(ϵ) was best predicted from a recently presented power-law model, with measured ka at -100 cm H2O of soil-water matric potential (ka,100) as a reference point. Trends of decreasing soil-water retention and increasing ϵ along transects were observed. Similar trends in ka and saturated hydraulic conductivity were not observed because the convective fluid transport parameters were mainly governed by soil structure and not by fluid phase contents. Autocorrelograms suggested a spatial correlation range of 10 to 20 m for gas transport parameters (Dp/Do and ka). Measurements of ϵ and ka at conditions close to -100 cm H2O of soil-water matric potential are suggested for rapid assessment of the magnitude and spatial variations in gas transport properties at the field scale.
Full text available upon request to the author
Article title: Predicting Gas Diffusivity for Undisturbed Volcanic Ash Soils: A New Linear Model
Authors: Augustus C. Resurreccion, Ken Kawamoto, Per Moldrup, Toshiko Komatsu
Publication title: not stated
Abstract:
No available
Full text link: https://tinyurl.com/vwzh7jzj