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Articles by H. Moazed
Total Records ( 5 ) for H. Moazed
  A.A. Naseri , Y. Hoseini , H. Moazed , F. Abbasi and H.M.V. Samani
  Phosphorus (p) adsorption characteristics of 5 soil samples were studied in soils of Southeastern Iran during 2009/2010 cropping season. Some soil properties as well as selected P-adoption characteristics were studied in these soils, Results show for this study Freundlich adsorption isotherm has good match with phosphorus adsorbed data and has good R-square. Freundlich sorption isotherms were used to evaluate the P requirement of 5 soils in a lab study. The soils were medium to heavy textured, acidic in reaction and were highly calcareous. Amount of P sorbed by the soils increased with increasing P in equilibrium solution. Quantities of P retained on sod solid phase were significantly correlated (p<0.05) with clay content of the soils. Maximum P was sorbed by a soil that had the maximum (64%) Clay content. there were negative relationship between P adsorption capacity and SOC and Ca content of soils.
  H. Moazed , Y. Hoseini , A.A. Naseri and F. Abbasi
  Phosphorus (p) adsorption characteristics of 5 soil samples were studied in soils of Omidie, Southeastern Iran during 2009/2010 cropping season. The concentrations of the solutions were 4, 12, 25, 50, 70 mg P L-1. Some soil properties as well as selected P-adoption characteristics were studied in these soils. Results show for this study Langmuir adsorption isotherm has better match with phosphorus adsorbed data and has maximum R-square. Differences in P- adsorption was greatly influenced by Soil Organic Carbon (SOC), soil pH, exchangeable calcium, exchangeable aluminium. Regression analysis shows that SOC and Alsat were the highest predictors of P-adsorption in soils of the study site. There is need for inclusion of more soil chemical, physical and mineralogical properties in predicting soil P-adsorption to enhance reliability of information.
  H. Moazed , E. Maroufpour , H.A. Kashkouli and J.M.V. Samani
  In the present study, the dependence of dispersivity on the thickness of aquifer has been investigated. The physical model used in the study consisted of a rectangular Plexiglas tank with inner dimensions of 720 mm length, 100 mm width and 1200 mm height. Sodium chloride with an electrical conductivity (EC) of 14 dS m-1 was selected as conservative contaminant. Porous media used in the experiments consisted of homogeneous coarse and medium sand particles. The experiments were performed in two different stages. In the first stage, 10 experiments in the aquifer with coarse sand particles and eight experiments in the aquifer with medium sand particles with constant thickness of 100 mm and flow velocities ranging from 4.5x10-5 to 11.25x10-5 m sec-1 were performed. In the second stage, experiments with thicknesses of 200-1000 and 100 mm layer distance were performed. The flow velocity in the second stage was maintained at 9.0x10-5 m sec-1 for each simulated aquifer, based on the previous studies. Results of the study indicated that: (1) the dispersivity values obtained for coarse and medium sand particles with 100 mm thickness were in the range of 0.25-0.65 and 0.11-0.33 cm, respectively and the mean values of dispersivity for both aquifers were in the range of 0.01 to 1.0 cm which are in agreement with the findings of other researchers, (2) the dispersivity values obtained for aquifers with coarse and medium sand particles and thicknesses of 200-1000 mm were in the range of 0.31-0.63 and 0.14-0.46 cm, respectively, which are in agreement with the findings of others as well, (3) the dispersivity of sandy porous media is independent of particle size and (4) in homogeneous sandy aquifers with coarse and medium particle size, the dispersivity is independent of aquifer thickness.
  H. Moazed , A. Bavi , S. Boroomand-Nasab , A. Naseri and M. Albaji
  In order to study the effects of different wind conditions, operating pressures, various sprinklers layouts and spacing on water distribution uniformity in sprinkler irrigation system a research project was conducted under 3 different wind velocities (0-5, 5-7 and > 7 m sec-1), using 3 operating pressure (35, 40 and 45 m), three spacing on the lateral pipeline (15, 18 and 21 m) and 3 different layouts (square, rectangular and triangular). Simulation experiments were conducted to estimate water distribution uniformity. The results indicated that the distribution coefficient uniformity decreased with the increase of the wind velocity. With the increase of wind velocity up to 7 m sec-1, the decrease of coefficient uniformity was not significant (the coefficient was reduced by 20% in the range of wind velocity applied). The highest water distribution coefficient uniformity was occurred on 15x5 m spacing while the lowest value was achieved for spacing of 21x21 m and sprinkler spacing to spray diameter of 0.5x0.5 with the increase of sprinklers spacing to the spray diameter, coefficient uniformity is reduced, especially at higher wind velocities. Therefore at higher wind velocities, it is recommended to reduce sprinklers spacing to spray diameter ratio and use square arrangement in order to achieve acceptable uniformity.
  A.A. Naseri , Y. Hoseini , H. Moazed , F. Abbasi , H.M.V. Samani and S.A. Sakebi
  The objective of the present study was to understand Phosphorus transport from soil columns at different water flux densities and to compare computer simulation results using HYDRUS-3D and the physical model against column-experiment data. Towards that end, two water flux densities (0.0075, 0.0065 m sec-1) and P concentration rates (33 mol cm-3) were used. The soil used has a silty clay- loam texture. The numerical model (HYDRUS-3D) successfully predicted P transport in the present experiment. Overall, the HYDRUS-3D model successfully simulated the water flow in the columns; however, it overestimated the final adsorbed PO4 concentrations in the soil. The present column experiment is useful for assessing relative behavior of P in increasing the movement of phosphorus ions out of the soil profile and into ground waters.
 
 
 
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