The study and comparison of Fried-Combernous and Brigham mathematical models for calculating Nitrate dispersivity in saturated conditions

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AZADIFAR A.; SOLTANI MOHAMMADI A.; MOAZED H.

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Journal: Journal of Water and Soil Conservation Year:2018 | Volume:25 | Issue:3 Page(s): 145-159

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Title

The study and comparison of Fried-Combernous and Brigham mathematical models for calculating Nitrate dispersivity in saturated conditions

Author(s)

AZADIFAR A. | SOLTANI MOHAMMADI A. | MOAZED H. | Issue Writer Certificate

Keywords

Breakthrough curvesQ2

Brigham modelQ1

DispersivityQ1

Fried-Combernous modelQ1

Abstract

Background and Objectives: In during the past decades, the study of pollutants transfer in saturation zone has become an important issue due to its chemical and physical effects on subsurface water. On the other hand, the increasing application rate of nitrogen fertilizers has been considered as a serious threat to groundwater and human health due to its high dynamic nature in soil. Brigham and Fried-Combernous models have been proposed for the Dispersivity calculation in short and long travel distances, respectively and are the most significant models of persistent contaminant transport in homogeneous saturated porous media under constant flow. The purpose of this study was the evaluation and comparison of Fried-Combernous and Brigham mathematical models to calculate nitrate Dispersivity in homogeneous saturated sandy soils under laboratory conditions. Materials and Methods: In order to study the Dispersivity using Fried-Combernous and Brigham models, pure potassium nitrate salt solution was added to sandy soil columns (in the three size of coarse, medium and fine and distance transmission of 80, 40 and 20 cm) as persistent contaminant under the sustainable regime with concentration of 160 (mg⁄ lit). The concentration of output nitrate were then measured in three different porosity volumes and Breakthrough curves were plotted for each column to obtain all required parameters. Results: Experimental data analyze by analytical Fried-Combernous and Brigham models revealed that there is a significant difference between the Dispersivity of fine sandy soil and Dispersivity of coarse and medium sandy soil in both models. So with increasing in the average travel distance in medium and coarse sand, nitrate Dispersivity increased. Investigation of the calculated values of β parameter for fine sand showed that this parameter increases dramatically with increasing travel distance. This represents a higher pollutants velocity transition than the water velocity in the pores at the shorter distances in fine sand. Therefore the travel distance increases with increasing Dispersivity. Conclusion: Evaluation of the results revealed that unlike long travel distance, the results of Fried-Combernous and Brigham models were different and therefore, it could not be generalized to long travel distances indicating that the Fried-Combernous model was not efficient enough for short travel distances.

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APA: Copy

AZADIFAR, A., SOLTANI MOHAMMADI, A., & MOAZED, H.. (2018). The study and comparison of Fried-Combernous and Brigham mathematical models for calculating Nitrate dispersivity in saturated conditions. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), 25(3 ), 145-159. SID. https://sid.ir/paper/156121/en

Vancouver: Copy

AZADIFAR A., SOLTANI MOHAMMADI A., MOAZED H.. The study and comparison of Fried-Combernous and Brigham mathematical models for calculating Nitrate dispersivity in saturated conditions. JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES)[Internet]. 2018;25(3 ):145-159. Available from: https://sid.ir/paper/156121/en

IEEE: Copy

A. AZADIFAR, A. SOLTANI MOHAMMADI, and H. MOAZED, “The study and comparison of Fried-Combernous and Brigham mathematical models for calculating Nitrate dispersivity in saturated conditions,” JOURNAL OF WATER AND SOIL CONSERVATION (JOURNAL OF AGRICULTURAL SCIENCES AND NATURAL RESOURCES), vol. 25, no. 3 , pp. 145–159, 2018, [Online]. Available: https://sid.ir/paper/156121/en

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