Study on eutrophic evaluation and numerical simulation of TP content in Nansi Lake

摘要

Based on the four investigations of water quality in Nansi Lake in Aug and Dec 2008, July and Oct 2009, comprehensive trophic state index (TSI) and surface water modeling system (SMS) were utilized to indicate the eutrophic degree and simulate TP content. The results implied that the eutrophic degree of the upper lake was much more serious than that of the lower lake. Nanyang sublake revealed a trophic shift, from mesotrophic to oligotrophic, from 2008 to 2009, while Zhaoyang and Weishan sublake was in oligotrophic state in 2008 and 2009. The TSI of Dushan sublake in 2009 was higher than that in 2008, and Dushan sublake reached to mesotrophic state in Oct 2009. Visualized charts obtained from SMS demonstrated the TP content of the upper lake was associated with its water flow velocity: the faster the water flow velocity was, the lower TP content would be.