Pan, L.; Fang, J.; Tian, L., and Wang, F., 2019. Water migration pathway based on freshwater diatoms in sea area adjacent to the Nangang Industrial Zone of Tianjin. In: Guido-Aldana, P.A. and Mulahasan, S. (eds.), Advances in Water Resources and Exploration. Journal of Coastal Research, Special Issue No. 93, pp. 232–240. Coconut Creek (Florida), ISSN 0749-0208.

The diatom assemblages and pathway of seawater migration in areas of the ocean adjacent to land reclamation areas was analyzed based on the distribution of diatom in 40 surface samples. Results revealed 37 species from 25 genera in study area, including five saltwater genera species (Coscinodiscus spp., Cyclotella stylorum, Actinocyclus spp., Thalassionema nitzschiodes, Diploneis bombus) and one brackish species, Auliscus caelatus. Saltwater and brackish species were found most abundant, the relative abundance of saltwater species tended to increase from coastal to offshore, whereas brackish species was opposite. In addition, there were 29 stations had freshwater diatoms, accounting for 0.44%-4.03%. The characteristic distribution of freshwater diatoms tended to decrease from south intertidal zone to northeast and east in the south of Nangang Industry Zone (NIZ). In the north of NIZ, distribution of freshwater species tended to decrease from west to east. The distribution and abundance reduction of freshwater diatoms could be considered as seawater movement pathway. Freshwater diatoms brought by Nanpai River into the sea are moved in two directions. Firstly, the river flowed into the sea, after which it was driven by coastal currents south to north, then back to the south, where it was blocked by NIZ. The river flow was then transported to the northeast portion of study area by the overall currents from south to north in the bay. Second, coastal currents flow to the south when blocked by the NIZ and those that flow to the north collide with each other. This energy reached a dynamic balance, causing the fresh water of the NPR to be transported to the sea by the inertia of river. Overall, the completion of the NIZ had changed the direction of seawater in adjacent areas, which was also the main reason for differences in surface diatom changes at different samples.