Studying Effect of Travel Distance on Dispersion Coefficient in Layered Soil Perpendicular to Flow Direction using Numerical Model | ||
| Journal of Hydraulic and Water Engineering | ||
| دوره 1، شماره 1، مهر 2023، صفحه 41-54 اصل مقاله (396.65 K) | ||
| نوع مقاله: Original Article | ||
| شناسه دیجیتال (DOI): 10.22044/jhwe.2023.13118.1019 | ||
| نویسندگان | ||
| H. Mehdipanh* 1؛ N. Ramzanian Azizi1؛ A. Golshan2 | ||
| 1Department of Water Science and Engineering, Qaemshahr Branch, Islamic Azad University, Qaemshahr, Iran. | ||
| 2Expert of Water Engineering, Urban Green Space of Shahrood Municipality, Iran. | ||
| چکیده | ||
| One of the most important measurable properties of the porous medium is dispersivity, which is used in advection-dispersion equations related to pollutant transport in the study of groundwater. In the past, the dispersivity coefficient for the entire porous medium was considered as a constant coefficient, but many studies conducted in the last few decades have shown that the dispersivity depends on many parameters, including the travel distance. Since most of these studies have been conducted in homogeneous porous media, in this research, the effect of travel distance of 20, 50 and 80 cm on the dispersivity coefficient in a porous medium corresponding to coarse, medium and fine granularity was investigated. The results obtained in this research showed that in all travel distances, the volume of pore water reached one before reaching the relative concentration of 0.5, and the pollutant travel rate decreased with increasing travel distance, which was consistent with the results of other studies. Also, the numerical modeling by Hydrus numerical model showed that this model was able to calculate the value of the diffusion coefficient for the travel distances of 20, 50 and 80 cm with the RMSE error equal to 0.065, 0.068 and 0.061, respectively, which indicates its high accuracy is in simulating and moving the contaminant in the porous medium. | ||
| کلیدواژهها | ||
| Diffusivity؛ Transfer Distance؛ Layered Porous Medium؛ Brigham Model؛ Hydrous | ||
| مراجع | ||
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