Experimental study on dispersion coefficient of dredger fill in reclamation region |
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| Authors: | Zhao Lin Guo Hua Zhu Decheng Mao Guozhu Zheng Yi |
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| Institution: | School of Environmental Science and Engineering, Tianjin University, Tianjin 300072, China |
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| Abstract: | In order to satisfy the demand of land use, reclamation engineering has been undertaken in coastal cities for a long time. To study the contaminant transport in the reclamation districts, robust and accurate estimation of dispersion coefficient is essential. In this study, the continuous sodium chloride (NaCl) solution with constant concentration was introduced into the column filled with the dredger fill to get the breakthrough curves(BTCs). Inverse error function method(IEFM) and CXTFIT program were used for estimating dispersion coefficient. Results showed that the difference between the dispersion coefficients estimated by IEFM and CXTFIT program was slight. The main reason was that the BTC was not strictly linear. IEFM performed poorly in the nonlinear area, while the CXTFIT performed well over the entire BTCs. Moreover, the dispersion coefficient of dredger fill was small. The dispersion property of dredger fill would result in the slow migration of contaminants in the dredger fill. |
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| Keywords: | dredger fill hydrodynamic dispersion coefficient IEFM CXTFIT |
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