Notice of RetractionPiecewise linear growth model of water quality based on multilevel models

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

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This paper focuses on piecewise linear growth model of water quality about the river. The experiment was performed on South Sewage Discharge River of a certain Coastal City, in China. Physical, chemical parameters such as water temperature (T), turbidity (Tur) were measured over a one-year period including dry period, level period (May), wet period, level period (Oct.). Based on multilevel models, piecewise linear growth model of primary pollution factors (COD, NH₃-N) are established. Among them, three piecewise linear growth model of COD and four piecewise linear growth model of NH3-N can comparatively accurate reflect growth trend of water quality along different water period. These models can provide scientific foundation for general regulation and management of rivers.