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 estimatio...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 （NaC1） 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.展开更多
This paper deals with linear refraction-difractional and nonlinear dispersion mathematical models for simulation of low-frequency waves in port areas of various configurations. The phenomenon of resonance can be obser...This paper deals with linear refraction-difractional and nonlinear dispersion mathematical models for simulation of low-frequency waves in port areas of various configurations. The phenomenon of resonance can be observed in multiple places and pose a significant danger for ships and constructions. Generally, if the bottom relief is non-uniform and if inner/outer boundaries of protected areas are configurated in a complex way, the problem can be solved only by numerical methods. It presents the calculation results for the amplitude of infragravity waves at resonance frequencies. The paper highlights the solutions for diminishing the amplitude of resonance water fluctuations in port areas. In particular, it is noted that if a number of certain conditions is provided outside the protected area, it is possible to diminish substantially the height of infragravity waves inside the area. The validity of such an assumption is confirmed by calculations.展开更多
基金Supported by the Tianjin Research Program of Application Foundation and Advanced Technology(No.10JCZDJC24700)
文摘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 （NaC1） 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.
文摘This paper deals with linear refraction-difractional and nonlinear dispersion mathematical models for simulation of low-frequency waves in port areas of various configurations. The phenomenon of resonance can be observed in multiple places and pose a significant danger for ships and constructions. Generally, if the bottom relief is non-uniform and if inner/outer boundaries of protected areas are configurated in a complex way, the problem can be solved only by numerical methods. It presents the calculation results for the amplitude of infragravity waves at resonance frequencies. The paper highlights the solutions for diminishing the amplitude of resonance water fluctuations in port areas. In particular, it is noted that if a number of certain conditions is provided outside the protected area, it is possible to diminish substantially the height of infragravity waves inside the area. The validity of such an assumption is confirmed by calculations.
